252 results on '"Jackson CW"'
Search Results
2. Inherited thrombocytopenia caused by reduced platelet production in mice with the gunmetal pigment gene mutation
- Author
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Novak, EK, primary, Reddington, M, additional, Zhen, L, additional, Stenberg, PE, additional, Jackson, CW, additional, McGarry, MP, additional, and Swank, RT, additional
- Published
- 1995
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3. Mode of inheritance of the higher degree of megakaryocyte polyploidization in C3H mice. I. Evidence for a role of genomic imprinting in megakaryocyte polyploidy determination
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McDonald, TP, primary and Jackson, CW, additional
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- 1994
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4. Megakaryocytopoiesis and platelet production are stimulated during late pregnancy and early postpartum in the rat
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Jackson, CW, primary, Steward, SA, additional, Ashmun, RA, additional, and McDonald, TP, additional
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- 1992
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5. A unique talin antigenic determinant and anomalous megakaryocyte talin distribution associated with abnormal platelet formation in the Wistar Furth rat
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Jackson, CW, primary, Hutson, NK, additional, Steward, SA, additional, and Stenberg, PE, additional
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- 1992
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6. Rheologic properties of senescent erythrocytes: loss of surface area and volume with red blood cell age
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Waugh, RE, primary, Narla, M, additional, Jackson, CW, additional, Mueller, TJ, additional, Suzuki, T, additional, and Dale, GL, additional
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- 1992
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7. Pharmacotherapy of eating disorders.
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Jackson CW, Cates M, and Lorenz R
- Abstract
Eating disorders are complex, chronic disorders that are difficult to treat. In addition, the 2 primary eating disorders, anorexia nervosa and bulimia nervosa, may have acute, life-threatening consequences. Medication trials for eating disorders have been hampered by high dropout rates, high placebo response, short trial duration, insufficient doses, and difficult outcome measures. Only 1 medication has been FDA approved for any eating disorder to date, and that is for fluoxetine in the treatment of bulimia. Clearly, new large-scale, independent studies using novel agents, and studying the use of medications for both short- and long-term outcomes, are needed. [ABSTRACT FROM AUTHOR]
- Published
- 2010
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8. An analysis of megakaryocytopoiesis in the C3H mouse: an animal model whose megakaryocytes have 32N as the modal DNA class
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Jackson, CW, primary, Steward, SA, additional, Chenaille, PJ, additional, Ashmun, RA, additional, and McDonald, TP, additional
- Published
- 1990
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9. Prolonged thrombocytosis in mice after 5-fluorouracil results from failure to down-regulate megakaryocyte concentration. An experimental model that dissociates regulation of megakaryocyte size and DNA content from megakaryocyte concentration
- Author
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Chenaille, PJ, primary, Steward, SA, additional, Ashmun, RA, additional, and Jackson, CW, additional
- Published
- 1990
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10. Employment discrimination against older workers: an experimental study of hiring practices.
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Bendick M Jr., Jackson CW, and Romero JH
- Abstract
Pairs of resumes, one for a 57-year-old and the other for a 32-year-old, were mailed to 775 large firms and employment agencies across the United States. Although the resumes presented equal qualifications, the older job seeker received a less favorable employer response 26.5% of times when a position appeared to be vacant. Vigorous enforcement of equal opportunity laws as well as initiatives to change employer attitudes are appropriate responses to such discrimination. The technique of employment testing, demonstrated in this research, can be useful in both efforts. [ABSTRACT FROM AUTHOR]
- Published
- 1996
11. THE APPLICATION OF FINDINGS FROM EXPERIMENTAL SENSORY DEPRIVATION TO CASES OF CLINICAL SENSORY DEPRIVATION
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Kansky Ew, Pollard Jc, and Jackson Cw
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medicine.medical_specialty ,business.industry ,media_common.quotation_subject ,Sensation ,General Medicine ,Audiology ,Perception ,Humans ,Medicine ,Sensory deprivation ,Sensory Deprivation ,business ,media_common - Published
- 1962
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12. A Survey of Rorschach Teaching in the University
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Wohl J and Jackson Cw
- Subjects
Medical education ,Clinical instruction ,Teaching ,Interpretation (philosophy) ,Pedagogy ,University faculty ,ComputingMilieux_COMPUTERSANDEDUCATION ,Humans ,Psychology ,General Medicine ,Rorschach Test ,Rorschach test - Abstract
This paper reports on an extensive 81 item, nine page questionnaire on practices and attitudes toward the Rorschach, held by university faculty members who teach it. The questionnaire was sent to departments of psychology of which there was reason to believe basic clinical instruction in the Rorschach existed. Respondents were to be those people actually engaged in the teaching. The detailed questionnaire covered such areas as structure and coverage of the course, purposes for teaching Rorschach, technique of administration and interpretation, its uses, characteristics of instructors, and research. Seventy-five per cent of the questionnaires were returned. The paper summarizes and considers implications of this information.
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- 1966
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13. Figural After-Effects, 'Brain Modifiability,' and Schizophrenia: A Further Study
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Wertheimer M and Jackson Cw
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Gender Studies ,Arts and Humanities (miscellaneous) ,Schizophrenia (object-oriented programming) ,Schizophrenia ,MEDLINE ,Brain ,Neurochemistry ,Experimental and Cognitive Psychology ,Psychology ,Vision, Ocular ,Developmental psychology - Published
- 1957
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14. Two-color flow cytometric measurement of DNA distributions of rat megakaryocytes in unfixed, unfractionated marrow cell suspensions
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Jackson, CW, Brown, LK, Somerville, BC, Lyles, SA, and Look, AT
- Abstract
The ploidy distribution of megakaryocytes shifts in response to platelet demand and thus provides a sensitive index of megakaryocytopoiesis. Flow cytometry (FCM) is a potentially valuable method for rapid determination of ploidy distributions of megakaryocyte populations; however, because megakaryocytes constitute only a very small proportion of the cells in unfractionated marrow, other rare events, such as cell clumping, complicate FCM analysis. We describe the measurement of cellular DNA distributions of megakaryocytes by two- color FCM in unfixed, unfractionated marrow--a method based on the resistance of megakaryocytes to hypotonic lysis in the cold for at least 2 days. Specific platelet antiserum was used to label megakaryocytes by indirect immunofluorescence with fluorescein (green fluorescence), and DNA was stained with propidium iodide (red fluorescence) in hypotonic citrate solution. The ploidy distribution of megakaryocytes was selectively determined with two-color, green-gated FCM, with which the red and green fluorescence of all cells is analyzed, but only the red fluorescence (DNA content) of cells that specifically bound the platelet antibody is recorded. We demonstrate that this method can readily detect changes in megakaryocyte DNA distributions due to experimental thrombocytopenia or platelet hypertransfusion and, therefore, should be useful for both experimental and clinical investigations of megakaryocytopoiesis.
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- 1984
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15. Effect of hypertransfusion on bone marrow regeneration in sublethally irradiated mice. I. enhanced granulopoietic recovery
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Smith, PJ, Jackson, CW, Dow, LW, Edwards, CC, and Whidden, MA
- Abstract
Hypertransfusion can enhance recovery from neutropenia in certain clinical and experimental situations. We have studied the pattern of myeloid recovery in mice hypertransfused after receiving 350 rads whole body irradiation. Both hypertransfused and control groups showed the degenerative phase, abortive rise, and regenerative phase that has been described following sublethal irradiation. The blood granulocyte counts in the hypertransfused group returned to normal more rapidly and were maintained at a significantly higher level during the regenerative phase. This difference is not the result of a shift in granulocytes from the marrow granulocyte reserve or marginal granulocyte pool to the circulating pool, but is associated with significantly enhanced bone marrow granulopoiesis. While the total bone marrow cellularity of the hypertransfused mice is less than that of the control mice, the hypertransfused group contains more CFU-GM and myeloid cells during the regenerative phase. The enhanced granulopoiesis is not due to increased colony-stimulating activity (CSA) levels in the hypertransfused mice, as the CSA levels were significantly lower in this group compared to the controls prior to and during the initial phase of granulopoietic recovery. This study suggests that hypertransfusion increases the rate of recovery of myelopoiesis by increasing the number of precursors available for myeloid differentiation from an earlier stem cell compartment.
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- 1980
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16. Effect of hypertransfusion on bone marrow regeneration in sublethally irradiated mice. II. Enhanced recovery of megakaryocytes and platelets
- Author
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Smith, PJ, Jackson, CW, Whidden, MA, and Edwards, CC
- Abstract
Hypertransfusion can enhance myeloid recovery after bone marrow depletion, but its influence on thrombopoietic recovery has not been previously defined. We have studied the pattern of platelet and megakaryocyte recovery in mice hypertransfused after receiving 350 rad whole body irradiation. The platelet counts of the hypertransfused group showing an initial fall due to hemodilution in the expanded blood volume and then fell to a lower nadir than that of the control mice. The rate of platelet recovery was more rapid in the hypertransfused mice. Bone marrow megakaryocyte concentrations in both groups showed a degenerative phase, abortive rise, and regenerative phase. The decrease in megakaryocytes was the same in both groups. The hypertransfused mice showed a greater abortive rise in megakaryocyte concentration preceded by the appearance of a greater number of large megakaryocytes in the bone marrow. However, the most striking effect of hypertransfusion was on megakaryocyte recovery. Although the time of onset of recovery was not different, the rate of recovery was approximately twice as rapid in the hypertransfused group. Administration of daily erythropoietin to hypertransfused mice abolished this more rapid recovery. Thus, the presence of a simultaneous demand for erythroid precursors does affect the rate of megakaryocyte regeneration. Just as the more rapid recovery of granulopoiesis following hypertransfusion may be clinically beneficial, the more rapid reconstitution of thrombopoiesis may also offer clinical advantage in some circcumstances.
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- 1980
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17. Increases in circulating megakaryocyte growth-promoting activity in the plasma of rats following whole body irradiation
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Miura, M, Jackson, CW, and Lyles, SA
- Abstract
To gain insight into the regulation of megakaryocyte precursors in vivo, we assayed (in vitro) megakaryocyte growth-promoting activity (Meg-GPA) in plasma of rats in which both marrow hypoplasia and thrombocytopenia had been induced by irradiation. Rats received whole body irradiation of 834 rad from a 137Cs source. Plasma was collected at intervals of hours to days, up through day 21 postirradiation, and was tested, at a concentration of 30%, for Meg-GPA on bone marrow cells cultured in 1.1% methylcellulose with 5 X 10(-5) M 2-mercaptoethanol. With normal rat plasma, no megakaryocyte colonies (defined as greater than or equal to 4 megakaryocytes) were seen and only a few single megakaryocytes and clusters (defined as 2 or 3 megakaryocytes) were formed. Two peaks of plasma Meg-GPA were observed after irradiation. The first appeared at 12 hr, before any decrease in marrow megakaryocyte concentration or platelet count. The second occurred on days 10–14 after irradiation, after the nadir in megakaryocyte concentration and while platelet counts were at their lowest levels. A dose-response study of plasma concentration and megakaryocyte growth, using plasma collected 11 days postirradiation, demonstrated that patterns of megakaryocyte growth were related to plasma concentration; formation of single megakaryocytes was optimal over a range of 20%-30% plasma concentration, while cluster and colony formation were optimal at a plasma concentration of 30%. All forms of megakaryocyte growth were decreased with 40% plasma. There was a linear relationship between the number of bone marrow cells plated and growth of single cells, clusters, and colonies using a concentration of 30% plasma collected 11 days after irradiation. We conclude that irradiation causes time- related increases in circulating megakaryocyte growth-promoting activity. We suggest that the irradiated rat is a good model for studying the relationships between Meg-GPA and megakaryocyte and platelet concentration in vivo.
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- 1984
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18. The Wistar Furth rat: an animal model of hereditary macrothrombocytopenia
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Jackson, CW, Hutson, NK, Steward, SA, Ashmun, RA, Davis, DS, Edwards, HH, Rehg, JE, and Dockter, ME
- Abstract
The mechanisms that determine and regulate platelet size are unknown. By phase microscopy, we observed that Wistar Furth (WF) rats had macrothrombocytopenia. In this study, we have characterized and compared platelets and megakaryocytes of WF rats with those of Wistar, Long-Evans hooded (LE), and Sprague-Dawley rats. In addition, we have examined the mode of inheritance of this WF rat platelet abnormality. The average platelet count of WF rats was only one-third that of the other three rat strains. In contrast, the mean platelet volume (MPV) of adult WF rats was twice that of the other rat strains; however, the average megakaryocyte diameter and DNA content distribution of WF rats were not significantly different from those of LE rats. The average megakaryocyte concentration was 30% lower in the WF strain compared with that of LE rats. Mazelike membrane formations were observed in WF platelets and megakaryocytes by electron microscopy. Reciprocal crosses of WF and LE rats resulted in offspring with MPVs and platelet counts like those of LE rats, indicating that the macrothrombocytopenic trait is recessive in its inheritance. Reciprocal marrow transplants between the WF and LE strains resulted in MPVs like those of the donor strain, demonstrating that the macrothrombocytopenia is an intrinsic marrow abnormality of the WF strain. Splenectomy did not alter the MPV of WF rats. The response of WF megakaryocytes and platelets to severe, acute thrombocytopenia was similar to that of LE rats except that the shift to higher megakaryocyte DNA contents was muted and platelet recovery was slower in the WF rats. In summary, the WF rat has a hereditary macrothrombocytopenia that is recessive in nature and not due to differences in megakaryocyte size or DNA content. These results suggest that the macrothrombocytopenia of WF rats results from the formation of fewer platelets per megakaryocyte, possibly resulting from a qualitative or quantitative defect in some component necessary for proper subdivision of megakaryocyte cytoplasm into platelets.
- Published
- 1988
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19. Interaction of ristocetin and bovine plasma with guinea pig megakaryocytes: a means to enrich megakaryocytes based on membrane rather than physical characteristics
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Jackson, CW, Steward, SA, Hutson, NK, and Ashmun, RA
- Abstract
We have investigated whether megakaryocytes can be aggregated by ristocetin and bovine plasma and whether such aggregation can be used as a step in the purification of megakaryocytes from marrow cell suspensions. Guinea pig marrow cell suspensions were first enriched for megakaryocytes by density equilibrium centrifugation in continuous Percoll density gradients. The megakaryocyte-enriched marrow was stirred in a platelet aggregometer to which ristocetin or bovine plasma was added. Megakaryocytes were aggregated by both ristocetin and bovine plasma with the proportion aggregated being related to the concentration of ristocetin or bovine plasma. Maximal aggregation (greater than 90% of megakaryocytes) was achieved with 2.0 mg/mL ristocetin or 5% bovine plasma and required five minutes. All maturation stages of morphologically recognizable megakaryocytes were aggregated. The megakaryocyte aggregates were separated from the marrow suspension by sedimentation at 1 g and the megakaryocytes disaggregated by dilution with media (ristocetin aggregated) or addition of dextran sulfate (bovine plasma aggregated). Megakaryocyte purity and recovery were higher with bovine plasma than with ristocetin. A mean of 92% of the megakaryocytes in the bovine plasma aggregated cell suspensions were recovered with megakaryocytes constituting an average of 76% of the final cell suspensions. The viability as well as the diameters and DNA content distribution of these megakaryocytes were similar to those of the starting population. We conclude that guinea pig megakaryocytes behave like platelets in that they can be aggregated with ristocetin or bovine plasma and that megakaryocyte aggregation induced by ristocetin or bovine plasma provides a means to enrich these cells based on membrane rather than physical characteristics. This approach yields purified megakaryocyte populations that are representative of those in unfractionated marrow.
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- 1987
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20. Relationship of megakaryocyte size at diagnosis to chemotherapeutic response in children with acute nonlymphocytic leukemia
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Jackson, CW and Dahl, GV
- Abstract
Small megakaryocytes are frequently seen in patients with acute nonlymphocytic leukemia (ANLL). In this study, median megakaryocyte diameters were determined in marrow biopsy specimens of 32 children at diagnosis of ANLL and related to platelet count and chemotherapeutic response. The association between median megakaryocyte size and time-to- failure was striking. Seven of 9 patients with median megakaryocyte diameters greater than 20 microns remain in continuous complete remission for more than 3 yr, whereas 20 of 23 patients with smaller median megakaryocyte diameters failed therapy within 15 mo (p = 0.002). By Cox-regression analysis, megakaryocyte size had independent prognostic value (p less than 0.001), surpassing that of spleen size, the only other feature having significant association with time-to- failure. Megakaryocyte size at diagnosis may be useful for predicting the likelihood of prolonged complete remission in ANLL.
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- 1983
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21. Stimulation of megakaryocytopoiesis by acute thrombocytopenia in rats
- Author
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Odell, TT, Murphy, JR, and Jackson, CW
- Abstract
Rats were made acutely thrombocytopenic by injection of antiplatelet serum. Marrow sections and squash preparations were made at intervals during 120 hr. Determinations were made of mitotic index, stage of maturation, ploidy level, and cell size of megakaryocytes; number and size of platelets were measured. Increased endomitosis among megakaryocytes was followed by an increase in the proportion of immature megakaryocytes, a greater average ploidy level of recognized megakaryocytes, and larger megakaryocytes. Maximum changes in these several parameters occurred between 32 and 72 hr after induction of thrombocytopenia. By 120 hr all megakarocyte parameters were near normal. For about 3 days, beginning at about 36 hr, platelet numbers increased rapidly. Average platelet size rose and returned to normal within about 60 hr. Changes in ploidy and size of megakaryocytes were measured in the immature and mature maturation stages. The results suggest that the initial stimulus in response to acute thrombocytopenia acts primarily on diploid precursors, programming them to mature into a population of megakaryocytes with an average ploidy approximately one level greater than in normal rats and a proportionate increase in cell size. The larger megakaryocytes presumably produce more platelets, accounting for a major part of the increased rate of platelet production. Since the changes in megakaryocytes begin to reverse before circulating platelet numbers have reached the normal level, reversal of the stimulus appears to be initiated by some change other than platelet mass.
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- 1976
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22. Suitability of the subjective stress scale for hsopitalized subjects
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Rich R, Jackson Cw, and Parisen Mp
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Stress (mechanics) ,Hospitalization ,Scale (ratio) ,Patients ,Humans ,Psychology ,General Nursing ,Stress, Psychological ,Clinical psychology - Published
- 1969
23. Suggestions for the Care of Eye Surgery patients Who Experience Reduced Sensory Input
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Ellis R, Rich R, Hughey Ga, Jackson Cw, and Schlotfeldt Rm
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medicine.medical_specialty ,business.industry ,medicine.medical_treatment ,medicine ,Physical therapy ,Sensory system ,General Medicine ,Eye surgery ,business ,General Nursing - Published
- 1967
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24. SENSORY DEPRIVATION AS A FIELD OF STUDY
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Ellis R and Jackson Cw
- Subjects
Field (physics) ,business.industry ,Quantum electrodynamics ,Medicine ,business ,General Nursing - Published
- 1971
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25. Hyponatremia associated with escitalopram.
- Author
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Covyeou JA and Jackson CW
- Published
- 2007
26. Post-marketing safety of antiseizure medications: Focus on serious adverse effects including drug reaction with eosinophilia and systemic symptoms (DRESS).
- Author
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Qian J, Xue X, Ezeja L, Boxx Z, and Jackson CW
- Abstract
Purpose: On November 28, 2023, the U.S. FDA issued a Drug Safety Communication, warning that antiseizure medications (ASMs) levetiracetam and clobazam can cause a rare but serious reaction, drug reaction with eosinophilia and systemic symptoms (DRESS). However, the risk of DRESS from other ASMs remains unclear. This observational study examined post-marketing safety of ASMs focusing on serious adverse events (AEs) reporting including DRESS., Methods: This retrospective, cross-sectional study analyzed the U.S. FDA Adverse Event Reporting System (FAERS) data from January 1, 2004, to March 31, 2024. Ten older (valproic acid, carbamazepine, oxcarbazepine, phenytoin, and phenobarbital) and newer (zonisamide, topiramate, lamotrigine, lacosamide, and brivaracetam) frequently used ASMs and three benzodiazepines (lorazepam, chlordiazepoxide, and diazepam) in clinical practice as alternative treatments were examined together with levetiracetam and clobazam, respectively. Disproportionality analysis, reporting odds ratio (ROR), was used to detect reporting risk signals of DRESS along with serious AE, hospitalization, death, and Stevens-Johnson Syndrome (SJS) for levetiracetam/clobazam and alternative treatments. A statistically significant reporting risk signal was detected when the lower boundary of the 95 % confidence interval for the RORs exceeded 1., Results: Levetiracetam had significant reporting risks of serious AE, hospitalization, DRESS, and SJS. Older ASMs including valproic acid, carbamazepine, oxcarbazepine, phenytoin, and phenobarbital all had significant reporting risks of DRESS and SJS. Newer ASMs including zonisamide and lamotrigine had significant reporting risks of DRESS and SJS, while topiramate, lacosamide, and brivaracetam did not exhibit reporting risk for DRESS. Clobazam had significant reporting risks of serious AE, DRESS, and SJS. Lorazepam, chlordiazepoxide, and diazepam did not exhibit reporting risks for DRESS or SJS., Conclusions: Findings highlighted reporting risk signals of DRESS for levetiracetam/clobazam and alternative ASMs. Given the limitations from passive surveillance nature of FAERS, further surveillance and longitudinal studies are essential to evaluate and confirm our findings., Competing Interests: Declaration of competing interest The authors have no conflict of interest to report., (Copyright © 2025 British Epilepsy Association. Published by Elsevier Ltd. All rights reserved.)
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- 2025
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27. Resveratrol Mitigates Cognitive Impairments and Cholinergic Cell Loss in the Medial Septum in a Mouse Model of Gradual Cerebral Hypoperfusion.
- Author
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Fagerli E, Jackson CW, Escobar I, Ferrier FJ, Perez Lao EJ, Saul I, Gomez J, Dave KR, Bracko O, and Perez-Pinzon MA
- Abstract
Vascular cognitive impairment and dementia (VCID) is the second leading cause of dementia. There is currently no effective treatment for VCID. Resveratrol (RSV) is considered an antioxidant; however, our group has observed pleiotropic effects in stroke paradigms, suggesting more effects may contribute to mechanistic changes beyond antioxidative properties. The main goal of this study was to investigate if administering RSV twice a week could alleviate cognitive declines following the induction of a VCID model. Additionally, our aim was to further describe whether this treatment regimen could decrease cell death in brain areas vulnerable to changes in cerebral blood flow, such as the hippocampus and medial septum. We hypothesized RSV treatments in a mouse model of gradual cerebral hypoperfusion protect against cognitive impairment. We utilized gradual bilateral common carotid artery stenosis (GBCCAS) via the surgical implantation of ameroid constrictor devices. RSV treatment was administered on the day of implantation and twice a week thereafter. Cerebral perfusion was measured by laser speckle contrast imaging, and cognitive functions, including the recognition memory, the spatial working memory, and associative learning, were assessed by novel object recognition (NOR), Y-maze testing, and contextual fear conditioning (CFC), respectively. RSV treatment did not alleviate cerebral perfusion deficits but mitigated cognitive deficits in CFC and NOR after GBCCAS. Despite these deficits, no hippocampal pathology was observed; however, cholinergic cell loss in the medial septum was significantly increased after GBCCAS. This cholinergic cell loss was mitigated by RSV. This study describes a novel mechanism by which chronic RSV treatments protect against a VCID-induced cognitive decline through the preservation of cholinergic cell viability to improve memory performance.
- Published
- 2024
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28. Resveratrol Preconditioning Downregulates PARP1 Protein to Alleviate PARP1-Mediated Cell Death Following Cerebral Ischemia.
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Jackson CW, Xu J, Escobar I, Saul I, Fagerli E, Dave KR, and Perez-Pinzon MA
- Subjects
- Rats, Animals, Poly (ADP-Ribose) Polymerase-1 metabolism, Resveratrol pharmacology, NAD, Cerebral Infarction, Cell Death physiology, Brain Ischemia drug therapy, Brain Ischemia prevention & control, Stroke
- Abstract
Stroke remains a leading cause of mortality; however, available therapeutics are limited. The study of ischemic tolerance, in paradigms such as resveratrol preconditioning (RPC), provides promise for the development of novel prophylactic therapies. The heavily oxidative environment following stroke promotes poly-ADP-ribose polymerase 1 (PARP1)-overactivation and parthanatos, both of which are major contributors to neuronal injury. In this study, we tested the hypothesis that RPC instills ischemic tolerance through decreasing PARP1 overexpression and parthanatos following in vitro and in vivo cerebral ischemia. To test this hypothesis, we utilized rat primary neuronal cultures (PNCs) and middle cerebral artery occlusion (MCAO) in the rat as in vitro and in vivo models, respectively. RPC was administered 2 days preceding ischemic insults. RPC protected PNCs against oxygen and glucose deprivation (OGD)-induced neuronal loss, as well as increases in total PARP1 protein, implying protection against PARP1-overactivation. Twelve hours following OGD, we observed reductions in NAD
+ /NADH as well as an increase in AIF nuclear translocation, but RPC ameliorated NAD+ /NADH loss and blocked AIF nuclear translocation. MCAO in the rat induced AIF nuclear translocation in the ischemic penumbra after 24 h, which was ameliorated with RPC. We tested the hypothesis that RPC's neuroprotection was instilled through long-term downregulation of nuclear PARP1 protein. RPC downregulated nuclear PARP1 protein for at least 6 days in PNCs, likely contributing to RPC's ischemic tolerance. This study describes a novel mechanism by which RPC instills prophylaxis against ischemia-induced PARP1 overexpression and parthanatos, through a long-term reduction of nuclear PARP1 protein., (© 2023. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)- Published
- 2024
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29. Resveratrol Preconditioning Protects Against Ischemia-Induced Synaptic Dysfunction and Cofilin Hyperactivation in the Mouse Hippocampal Slice.
- Author
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Escobar I, Xu J, Jackson CW, Stegelmann SD, Fagerli EA, Dave KR, and Perez-Pinzon MA
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- Mice, Male, Animals, Resveratrol pharmacology, Ischemia, Hippocampus pathology, Actin Depolymerizing Factors, Brain Ischemia
- Abstract
Perturbations in synaptic function are major determinants of several neurological diseases and have been associated with cognitive impairments after cerebral ischemia (CI). Although the mechanisms underlying CI-induced synaptic dysfunction have not been well defined, evidence suggests that early hyperactivation of the actin-binding protein, cofilin, plays a role. Given that synaptic impairments manifest shortly after CI, prophylactic strategies may offer a better approach to prevent/mitigate synaptic damage following an ischemic event. Our laboratory has previously demonstrated that resveratrol preconditioning (RPC) promotes cerebral ischemic tolerance, with many groups highlighting beneficial effects of resveratrol treatment on synaptic and cognitive function in other neurological conditions. Herein, we hypothesized that RPC would mitigate hippocampal synaptic dysfunction and pathological cofilin hyperactivation in an ex vivo model of ischemia. Various electrophysiological parameters and synaptic-related protein expression changes were measured under normal and ischemic conditions utilizing acute hippocampal slices derived from adult male mice treated with resveratrol (10 mg/kg) or vehicle 48 h prior. Remarkably, RPC significantly increased the latency to anoxic depolarization, decreased cytosolic calcium accumulation, prevented aberrant increases in synaptic transmission, and rescued deficits in long-term potentiation following ischemia. Additionally, RPC upregulated the expression of the activity-regulated cytoskeleton associated protein, Arc, which was partially required for RPC-mediated attenuation of cofilin hyperactivation. Taken together, these findings support a role for RPC in mitigating CI-induced excitotoxicity, synaptic dysfunction, and pathological over-activation of cofilin. Our study provides further insight into mechanisms underlying RPC-mediated neuroprotection against CI and implicates RPC as a promising strategy to preserve synaptic function after ischemia., (© 2023. The Author(s).)
- Published
- 2023
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30. Resveratrol Preconditioning Mitigates Ischemia-Induced Septal Cholinergic Cell Loss and Memory Impairments.
- Author
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López-Morales MA, Escobar I, Saul I, Jackson CW, Ferrier FJ, Fagerli EA, Raval AP, Dave KR, and Perez-Pinzon MA
- Subjects
- Animals, Mice, Rats, Brain Ischemia, Cell Death drug effects, Cognition, Infarction, Middle Cerebral Artery, Memory Disorders, Neuroprotective Agents, Resveratrol pharmacology
- Abstract
Background: Cholinergic cells originating from the nuclei of the basal forebrain (BF) are critical for supporting various memory processes, yet BF cholinergic cell viability has not been explored in the context of focal cerebral ischemia. In the present study, we examined cell survival within several BF nuclei in rodents following transient middle cerebral artery occlusion. We tested the hypothesis that a previously established neuroprotective therapy-resveratrol preconditioning-would rescue BF cell loss, deficits in cholinergic-related memory performance, and hippocampal synaptic dysfunction after focal cerebral ischemia., Methods: Adult (2-3-month old) male Sprague-Dawley rats or wild-type C57Bl/6J mice were injected intraperitoneally with a single dose of resveratrol or vehicle and subjected to transient middle cerebral artery occlusion using the intraluminal suture method 2 days later. Histopathological, behavioral, and electrophysiological outcomes were measured 1-week post-reperfusion. Animals with reduction in cerebral blood flow <30% of baseline were excluded., Results: Cholinergic cell loss was observed in the medial septal nucleus and diagonal band of Broca following transient middle cerebral artery occlusion. This effect was prevented by resveratrol preconditioning, which also ameliorated transient middle cerebral artery occlusion-induced deficits in cognitive performance and hippocampal long-term potentiation., Conclusions: We demonstrate for the first time that focal cerebral ischemia induces cholinergic cell death within memory-relevant nuclei of the BF. The preservation of cholinergic cell viability may provide a mechanism by which resveratrol preconditioning improves memory performance and preserves functionality of memory-processing brain structures after focal cerebral ischemia.
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- 2023
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31. Paliperidone-Associated Sialorrhea: A Case Report With Review of Current Literature.
- Author
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Burk BG, Donaldson V, Jackson CW, Cates ME, and Birur B
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- Aripiprazole adverse effects, Benzodiazepines adverse effects, Humans, Male, Middle Aged, Paliperidone Palmitate adverse effects, Quality of Life, Antipsychotic Agents adverse effects, Sialorrhea chemically induced, Sialorrhea drug therapy
- Abstract
Purpose/background: Antipsychotic-associated sialorrhea is a problematic adverse effect with potentially negative consequences on quality of life and medication adherence. While clozapine is the antipsychotic that is most associated with sialorrhea, there have been published reports of other second-generation antipsychotics associated with sialorrhea, including aripiprazole, olanzapine, quetiapine, and risperidone. Although drooling is mentioned within the package insert for paliperidone, to date there have been minimal published reports in which paliperidone is implicated as the offending agent., Methods/procedures: Here, we present a case of sialorrhea in a 56-year-old man with schizoaffective disorder who had a supratherapeutic paliperidone level after both oral and intramuscular paliperidone use., Findings/results: Paliperidone was ultimately cross tapered to aripiprazole, and the patient was given atropine drops and benztropine with resolution of the sialorrhea. We provide a review of the literature regarding the other available reports of paliperidone-associated sialorrhea, possible mechanisms behind pathophysiology, as well as reports from the World Health Organization and Food and Drug Administration adverse event reporting systems., Implications/conclusions: Clinicians should be aware of the potential for paliperidone and other nonclozapine second-generation antipsychotics to be associated with sialorrhea, especially given the increased frequency of their use for a variety of psychiatric disorders., (Copyright © 2022 Wolters Kluwer Health, Inc. All rights reserved.)
- Published
- 2022
- Full Text
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32. Sirtuins and cognition: implications for learning and memory in neurological disorders.
- Author
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Fagerli E, Escobar I, Ferrier FJ, Jackson CW, Perez-Lao EJ, and Perez-Pinzon MA
- Abstract
Sirtuins are an evolutionarily conserved family of regulatory proteins that function in an NAD
+ -dependent manner. The mammalian family of sirtuins is composed of seven histone deacetylase and ADP-ribosyltransferase proteins (SIRT1-SIRT7) that are found throughout the different cellular compartments of the cell. Sirtuins in the brain have received considerable attention in cognition due to their role in a plethora of metabolic and age-related diseases and their ability to induce neuroprotection. More recently, sirtuins have been shown to play a role in normal physiological cognitive function, and aberrant sirtuin function is seen in pathological cellular states. Sirtuins are believed to play a role in cognition through enhancing synaptic plasticity, influencing epigenetic regulation, and playing key roles in molecular pathways involved with oxidative stress affecting mitochondrial function. This review aims to discuss recent advances in the understanding of the role of mammalian sirtuins in cognitive function and the therapeutic potential of targeting sirtuins to ameliorate cognitive deficits in neurological disorders., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Fagerli, Escobar, Ferrier, Jackson, Perez-Lao and Perez-Pinzon.)- Published
- 2022
- Full Text
- View/download PDF
33. Repeated short-term exposure to diesel exhaust reduces honey bee colony fitness.
- Author
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Reitmayer CM, Girling RD, Jackson CW, and Newman TA
- Subjects
- Agriculture, Animals, Bees, Crops, Agricultural, Pollen, Pollination, Vehicle Emissions toxicity
- Abstract
Production of insect-pollinated crops is often reliant on honey bee (Apis mellifera) pollination services. Colonies can be managed and moved to meet the demands of modern intensified monoculture farming systems. Increased colony mortalities have been observed, which are thought be caused by interacting factors including exposure to pesticides, parasites, viruses, agricultural intensification, and changes in global and regional climate. However, whilst common tropospheric air pollutants (e.g. NO
x , particulate matter etc) are known to cause a range of negative effects on human health, there is little evidence of their impact on the health of A. mellifera. This study investigates the effects of exposure to diesel exhaust on A. mellifera, both at the level of individual foragers and on the whole colony. We exposed a series of colonies to diesel exhaust fumes for 2 h a day over the course of three weeks and contrasted their performance to a series of paired control colonies located at the same field site. We investigated markers of neuronal health in the brains of individual foragers and measured the prevalence of common viruses. Electronic counters monitored daily colony activity patterns and pollen samples from returning foragers were analysed to investigate plant species richness and diversity. The amounts of honey, brood and pollen in each colony were measured regularly. We demonstrated an upregulation of the synapse protein Neurexin 1 in forager brains repeatedly exposed to diesel exhaust. Furthermore, we found that colonies exposed to diesel exhaust lost colony weight after the exposure period until the end of the summer season, whereas control colonies gained weight towards the end of the season. Further investigations are required, but we hypothesise that such effects on both individual foragers and whole colony fitness parameters could ultimately contribute to winter losses of honey bee colonies, particularly in the presence of additional stressors., (Copyright © 2022 Elsevier Ltd. All rights reserved.)- Published
- 2022
- Full Text
- View/download PDF
34. Ambitious AAPP vision necessitates bold actions.
- Author
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Cates ME and Jackson CW
- Abstract
Competing Interests: Disclosures: Both M.E.C. and C.W.J. are past presidents of the College of Psychiatric and Neurologic Pharmacists. M.E.C. is currently a Speaker for Otsuka Pharmaceutical PsychU and serves on the Board of Directors for the College of Psychiatric and Neurologic Pharmacists. In 2020, M.E.C. served on the Virtual Psychiatric Pharmacist Advisory Board of Alkermes, Inc.
- Published
- 2022
- Full Text
- View/download PDF
35. Mastocytosis and Mast Cell Activation Disorders: Clearing the Air.
- Author
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Jackson CW, Pratt CM, Rupprecht CP, Pattanaik D, and Krishnaswamy G
- Subjects
- Animals, Humans, Mast Cell Activation Disorders etiology, Mast Cells immunology, Mastocytosis etiology, Mast Cell Activation Disorders pathology, Mast Cells pathology, Mastocytosis pathology
- Abstract
Mast cells are derived from hematopoietic stem cell precursors and are essential to the genesis and manifestations of the allergic response. Activation of these cells by allergens leads to degranulation and elaboration of inflammatory mediators, responsible for regulating the acute dramatic inflammatory response seen. Mast cells have also been incriminated in such diverse disorders as malignancy, arthritis, coronary artery disease, and osteoporosis. There has been a recent explosion in our understanding of the mast cell and the associated clinical conditions that affect this cell type. Some mast cell disorders are associated with specific genetic mutations (such as the D816V gain-of-function mutation) with resultant clonal disease. Such disorders include cutaneous mastocytosis, systemic mastocytosis (SM), its variants (indolent/ISM, smoldering/SSM, aggressive systemic mastocytosis/ASM) and clonal (or monoclonal) mast cell activation disorders or syndromes (CMCAS/MMAS). Besides clonal mast cell activations disorders/CMCAS (also referred to as monoclonal mast cell activation syndromes/MMAS), mast cell activation can also occur secondary to allergic, inflammatory, or paraneoplastic disease. Some disorders are idiopathic as their molecular pathogenesis and evolution are unclear. A genetic disorder, referred to as hereditary alpha-tryptasemia (HαT) has also been described recently. This condition has been shown to be associated with increased severity of allergic and anaphylactic reactions and may interact variably with primary and secondary mast cell disease, resulting in complex combined disorders. The role of this review is to clarify the classification of mast cell disorders, point to molecular aspects of mast cell signaling, elucidate underlying genetic defects, and provide approaches to targeted therapies that may benefit such patients.
- Published
- 2021
- Full Text
- View/download PDF
36. Extremely Low-Frequency Electromagnetic Fields Entrain Locust Wingbeats.
- Author
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Shepherd S, Jackson CW, Sharkh SM, Aonuma H, Oliveira EE, and Newland PL
- Subjects
- Animals, Electromagnetic Fields adverse effects, Grasshoppers
- Abstract
Extremely low-frequency electromagnetic fields (ELF EMFs) have been shown to impact the behavior and physiology of insects. Recent studies have highlighted the need for more research to determine more specifically how they affect flying insects. Here, we ask how locust flight is affected by acute exposure to 50 Hz EMFs. We analyzed the flights of individual locusts tethered between a pair of copper wire coils generating EMFs of various frequency using high-speed video recording. The mean wingbeat frequency of tethered locusts was 18.92 ± 0.27 Hz. We found that acute exposure to 50 Hz EMFs significantly increased absolute change in wingbeat frequency in a field strength-dependent manner, with greater field strengths causing greater changes in wingbeat frequency. The effect of EMFs on wingbeat frequency depended on the initial wingbeat frequency of a locust, with locusts flying at a frequency lower than 20 Hz increasing their wingbeat frequency, while locusts flying with a wingbeat frequency higher than 20 Hz decreasing their wingbeat frequency. During the application of 50 Hz EMF, the wingbeat frequency was entrained to a 2:5 ratio (two wingbeat cycles to five EMF cycles) of the applied EMF. We then applied a range of ELF EMFs that were close to normal wingbeat frequency and found that locusts entrained to the exact frequency of the applied EMF. These results show that exposure to ELF EMFs lead to small but significant changes in wingbeat frequency in locusts. We discuss the biological implications of the coordination of insect flight in response to electromagnetic stimuli. © 2021 Bioelectromagnetics Society., (© 2021 The Authors. Bioelectromagnetics published by Wiley Periodicals LLC on behalf of Bioelectromagnetics Society.)
- Published
- 2021
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37. ASHP Therapeutic Position Statement on the Use of Antipsychotic Medications in the Treatment of Adults with Schizophrenia and Schizoaffective Disorder.
- Author
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Noel JM and Jackson CW
- Subjects
- Adult, Antipsychotic Agents adverse effects, Humans, Societies, Pharmaceutical, United States, Antipsychotic Agents administration & dosage, Psychotic Disorders drug therapy, Schizophrenia drug therapy
- Published
- 2020
- Full Text
- View/download PDF
38. Ischemic Neuroprotectant PKCε Restores Mitochondrial Glutamate Oxaloacetate Transaminase in the Neuronal NADH Shuttle after Ischemic Injury.
- Author
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Xu J, Khoury N, Jackson CW, Escobar I, Stegelmann SD, Dave KR, and Perez-Pinzon MA
- Subjects
- Animals, Malates metabolism, Male, Phosphorylation, Primary Cell Culture, Rats, Sprague-Dawley, Aspartate Aminotransferase, Mitochondrial metabolism, Brain Ischemia enzymology, NAD metabolism, Neurons enzymology, Protein Kinase C-epsilon metabolism
- Abstract
The preservation of mitochondrial function is a major protective strategy for cerebral ischemic injuries. Previously, our laboratory demonstrated that protein kinase C epsilon (PKCε) promotes the synthesis of mitochondrial nicotinamide adenine dinucleotide (NAD
+ ). NAD+ along with its reducing equivalent, NADH, is an essential co-factor needed for energy production from glycolysis and oxidative phosphorylation. Yet, NAD+ /NADH are impermeable to the inner mitochondrial membrane and their import into the mitochondria requires the activity of specific shuttles. The most important neuronal NAD+ /NADH shuttle is the malate-aspartate shuttle (MAS). The MAS has been implicated in synaptic function and is potentially dysregulated during cerebral ischemia. The aim of this study was to determine if metabolic changes induced by PKCε preconditioning involved regulation of the MAS. Using primary neuronal cultures, we observed that the activation of PKCε enhanced mitochondrial respiration and glycolysis in vitro. Conversely, inhibition of the MAS resulted in decreased oxidative phosphorylation and glycolytic capacity. We further demonstrated that activation of PKCε increased the phosphorylation of key components of the MAS in rat brain synaptosomal fractions. Additionally, PKCε increased the enzyme activity of glutamic oxaloacetic transaminase 2 (GOT2), an effect that was dependent on the import of PKCε into the mitochondria and phosphorylation of GOT2. Furthermore, PKCε activation was able to rescue decreased GOT2 activity induced by ischemia. These findings reveal novel protective targets and mechanisms against ischemic injury, which involves PKCε-mediated phosphorylation and activation of GOT2 in the MAS.- Published
- 2020
- Full Text
- View/download PDF
39. Increased aggression and reduced aversive learning in honey bees exposed to extremely low frequency electromagnetic fields.
- Author
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Shepherd S, Hollands G, Godley VC, Sharkh SM, Jackson CW, and Newland PL
- Subjects
- Animals, Aggression physiology, Bees physiology, Electromagnetic Fields, Learning
- Abstract
Honey bees, Apis mellifera, are a globally significant pollinator species and are currently in decline, with losses attributed to an array of interacting environmental stressors. Extremely low frequency electromagnetic fields (ELF EMFs) are a lesser-known abiotic environmental factor that are emitted from a variety of anthropogenic sources, including power lines, and have recently been shown to have a significant impact on the cognitive abilities and behaviour of honey bees. Here we have investigated the effects of field-realistic levels of ELF EMFs on aversive learning and aggression levels, which are critical factors for bees to maintain colony strength. Bees were exposed for 17 h to 100 μT or 1000 μT ELF EMFs, or a sham control. A sting extension response (SER) assay was conducted to determine the effects of ELF EMFs on aversive learning, while an intruder assay was conducted to determine the effects of ELF EMFs on aggression levels. Exposure to both 100 μT and 1000 μT ELF EMF reduced aversive learning performance by over 20%. Exposure to 100 μT ELF EMFs also increased aggression scores by 60%, in response to intruder bees from foreign hives. These results indicate that short-term exposure to ELF EMFs, at levels that could be encountered in bee hives placed under power lines, reduced aversive learning and increased aggression levels. These behavioural changes could have wider ecological implications in terms of the ability of bees to interact with, and respond appropriately to, threats and negative environmental stimuli., Competing Interests: The authors have declared that no competing interests exist.
- Published
- 2019
- Full Text
- View/download PDF
40. Resveratrol Preconditioning Induces Genomic and Metabolic Adaptations within the Long-Term Window of Cerebral Ischemic Tolerance Leading to Bioenergetic Efficiency.
- Author
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Khoury N, Xu J, Stegelmann SD, Jackson CW, Koronowski KB, Dave KR, Young JI, and Perez-Pinzon MA
- Subjects
- Acetyl Coenzyme A metabolism, Adenosine Triphosphate metabolism, Animals, Astrocytes drug effects, Astrocytes metabolism, Brain Ischemia pathology, Cell Respiration drug effects, Coculture Techniques, Down-Regulation drug effects, Down-Regulation genetics, Mitochondria drug effects, Mitochondria metabolism, Models, Biological, Neurons drug effects, Neurons metabolism, Rats, Sprague-Dawley, Time Factors, Transcriptome genetics, Adaptation, Physiological drug effects, Brain Ischemia genetics, Brain Ischemia physiopathology, Energy Metabolism drug effects, Genome, Ischemic Preconditioning, Resveratrol pharmacology
- Abstract
Neuroprotective agents administered post-cerebral ischemia have failed so far in the clinic to promote significant recovery. Thus, numerous efforts were redirected toward prophylactic approaches such as preconditioning as an alternative therapeutic strategy. Our laboratory has revealed a novel long-term window of cerebral ischemic tolerance mediated by resveratrol preconditioning (RPC) that lasts for 2 weeks in mice. To identify its mediators, we conducted an RNA-seq experiment on the cortex of mice 2 weeks post-RPC, which revealed 136 differentially expressed genes. The majority of genes (116/136) were downregulated upon RPC and clustered into biological processes involved in transcription, synaptic signaling, and neurotransmission. The downregulation in these processes was reminiscent of metabolic depression, an adaptation used by hibernating animals to survive severe ischemic states by downregulating energy-consuming pathways. Thus, to assess metabolism, we used a neuronal-astrocytic co-culture model and measured the cellular respiration rate at the long-term window post-RPC. Remarkably, we observed an increase in glycolysis and mitochondrial respiration efficiency upon RPC. We also observed an increase in the expression of genes involved in pyruvate uptake, TCA cycle, and oxidative phosphorylation, all of which indicated an increased reliance on energy-producing pathways. We then revealed that these nuclear and mitochondrial adaptations, which reduce the reliance on energy-consuming pathways and increase the reliance on energy-producing pathways, are epigenetically coupled through acetyl-CoA metabolism and ultimately increase baseline ATP levels. This increase in ATP would then allow the brain, a highly metabolic organ, to endure prolonged durations of energy deprivation encountered during cerebral ischemia.
- Published
- 2019
- Full Text
- View/download PDF
41. Acute exposure to diesel exhaust induces central nervous system stress and altered learning and memory in honey bees.
- Author
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Reitmayer CM, Ryalls JMW, Farthing E, Jackson CW, Girling RD, and Newman TA
- Subjects
- Animals, Central Nervous System metabolism, Central Nervous System physiology, HSP72 Heat-Shock Proteins genetics, HSP72 Heat-Shock Proteins metabolism, Insect Proteins genetics, Insect Proteins metabolism, Nitric Oxide toxicity, Nitrogen Dioxide toxicity, Stress, Physiological, Bees drug effects, Central Nervous System drug effects, Memory, Vehicle Emissions toxicity
- Abstract
For effective foraging, many insect pollinators rely on the ability to learn and recall floral odours, behaviours that are associated with a complex suite of cellular processes. Here, we investigated how acute exposure to a high-dose of diesel exhaust (containing 19.8 and 17.5 ppm of NO and NO
2 , respectively) affected associative learning behaviour of honey bees (Apis mellifera) and expression of a ubiquitous heat shock protein, HSP70, in their central nervous system (CNS). To determine whether exposure to diesel exhaust would alter their tolerance to a subsequent abiotic stress, we further subjected individuals to heat stress. Diesel exhaust exposure decreased honey bees' ability to learn and recall a conditioned odour stimulus. Whilst there was no significant difference in CNS HSP70 expression between honey bees exposed to either diesel exhaust or clean air across the entire duration of the experiment (3.5 h), there was a significant effect of time and a significant interaction between exposure treatment and time. This interaction was investigated using correlation analyses, which demonstrated that only in the diesel exhaust exposed honey bees was there a significant positive correlation between HSP70 expression and time. Furthermore, there was a 44% reduction in honey bee individuals that were able to recall the odour 72 h after diesel exposure compared with clean air control individuals. Moreover, diesel exhaust affected A. mellifera in a way that reduced their ability to survive a second subsequent stressor. Such negative effects of air pollution on learning, recall, and stress tolerance has potential to reduce foraging efficiency and pollination success of individual honey bees.- Published
- 2019
- Full Text
- View/download PDF
42. Altered Neural Networks in the Papez Circuit: Implications for Cognitive Dysfunction after Cerebral Ischemia.
- Author
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Escobar I, Xu J, Jackson CW, and Perez-Pinzon MA
- Subjects
- Brain Ischemia complications, Brain Ischemia psychology, Cognitive Dysfunction etiology, Cognitive Dysfunction psychology, Humans, Stroke complications, Stroke psychology, Brain Ischemia physiopathology, Cognitive Dysfunction physiopathology, Hippocampus physiopathology, Nerve Net physiopathology, Stroke physiopathology
- Abstract
Cerebral ischemia remains a leading cause of mortality worldwide. Although the incidence of death has decreased over the years, surviving patients may suffer from long-term cognitive impairments and have an increased risk for dementia. Unfortunately, research aimed toward developing therapies that can improve cognitive outcomes following cerebral ischemia has proved difficult given the fact that little is known about the underlying processes involved. Nevertheless, mechanisms that disrupt neural network activity may provide valuable insight, since disturbances in both local and global networks in the brain have been associated with deficits in cognition. In this review, we suggest that abnormal neural dynamics within different brain networks may arise from disruptions in synaptic plasticity processes and circuitry after ischemia. This discussion primarily concerns disruptions in local network activity within the hippocampus and other extra-hippocampal components of the Papez circuit, given their role in memory processing. However, impaired synaptic plasticity processes and disruptions in structural and functional connections within the Papez circuit have important implications for alterations within the global network, as well. Although much work is required to establish this relationship, evidence thus far suggests there is a link. If pursued further, findings may lead toward a better understanding of how deficits in cognition arise, not only in cerebral ischemia, but in other neurological diseases as well.
- Published
- 2019
- Full Text
- View/download PDF
43. Ambulatory care preceptors' perceptions on SOAP note writing in advanced pharmacy practice experiences (APPEs).
- Author
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Lisenby KM, Andrus MR, Jackson CW, Stevenson TL, Fan S, Gaillard P, and Carroll DG
- Subjects
- Ambulatory Care methods, Documentation methods, Education, Pharmacy methods, Educational Measurement methods, Feedback, Humans, Pharmaceutical Services, Surveys and Questionnaires, Documentation standards, Education, Pharmacy standards, Perception, Preceptorship methods
- Abstract
Introduction: Descriptions of SOAP note requirements and assessment methods used during advanced pharmacy practice experiences (APPEs) are limited in the literature. This study aimed to gather information from preceptors regarding SOAP note writing and assessment methods utilized during ambulatory care APPEs., Methods: A survey was developed and distributed to ambulatory care preceptors with data collected via Qualtrics and analyzed using descriptive statistics, Fisher's exact test to assess the significance for associations between dependent and independent variables, and the Gamma test to assess dependent variables in grading habits and feedback types., Results: The survey response rate was 62% with 75% of preceptors having students write SOAP notes during APPEs. A majority of preceptors (84%) do not formally grade SOAP notes with full-time faculty being more likely to grade and provide written feedback. Half of the preceptors perceived students as either prepared or very prepared to write SOAP notes but the majority felt that students struggle with the assessment portion of the note. There were significant differences between schools in the percentage of preceptors that formally grade SOAP notes, ranging from 2 to 45%., Conclusions: Preceptors' perception of student preparedness to write SOAP notes on ambulatory APPEs was similar, despite assessment methods varying widely., (Copyright © 2018 Elsevier Inc. All rights reserved.)
- Published
- 2018
- Full Text
- View/download PDF
44. Brain SIRT1 Mediates Metabolic Homeostasis and Neuroprotection.
- Author
-
Xu J, Jackson CW, Khoury N, Escobar I, and Perez-Pinzon MA
- Abstract
Sirtuins are evolutionarily conserved proteins that use nicotinamide adenine dinucleotide (NAD
+ ) as a co-substrate in their enzymatic reactions. There are seven proteins (SIRT1-7) in the human sirtuin family, among which SIRT1 is the most conserved and characterized. SIRT1 in the brain, in particular, within the hypothalamus, plays crucial roles in regulating systemic energy homeostasis and circadian rhythm. Apart from this, SIRT1 has also been found to mediate beneficial effects in neurological diseases. In this review, we will first summarize how SIRT1 in the brain relates to obesity, type 2 diabetes, and circadian synchronization, and then we discuss the neuroprotective roles of brain SIRT1 in the context of cerebral ischemia and neurodegenerative disorders.- Published
- 2018
- Full Text
- View/download PDF
45. Development and Validation of a Rubric to Evaluate Diabetes SOAP Note Writing in APPE.
- Author
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Andrus MR, McDonough SLK, Kelley KW, Stamm PL, McCoy EK, Lisenby KM, Whitley HP, Slater N, Carroll DG, Hester EK, Helmer AM, Jackson CW, and Byrd DC
- Subjects
- Education, Pharmacy methods, Faculty, Formative Feedback, Goals, Humans, Reproducibility of Results, Students, Pharmacy, Writing, Documentation standards, Educational Measurement methods
- Abstract
Objective. To develop and establish validity for a grading rubric to evaluate diabetes subjective, objective, assessment, plan (SOAP) note writing on primary care (PC) advanced pharmacy practice experiences (APPEs), and to assess reliability and student perceptions of the rubric. Methods. Ten PC APPE faculty members collaborated to develop a rubric to provide formative and summative feedback on three written SOAP notes per APPE student over a 10-month period. Correlation analyses were conducted between rubric scores and three criterion variables to assess criterion-related validity: APPE grades, Pharmaceutical Care Ability Profile Scores, and Global Impression Scores. Inter-rater and intra-rater reliability testing were completed using Cohen's kappa and Intraclass Correlation Coefficients (ICC). Student perceptions were assessed through an anonymous student survey. Results. Fifty-one students and 167 SOAP notes were evaluated using the final rubric. The mean score significantly increased from the first to second SOAP note and from the first to third SOAP note. Statistically significant positive correlations were found between final rubric scores and criterion variables. The ICC for inter-rater reliability was fair (.59) for final rubric scores and excellent for intra-rater reliability (.98 to1.00). Students responded that the rubric improved their ability (84.9%) and confidence (92.4%) to write SOAP notes. Conclusion. The rubric may be used to make valid decisions about students' SOAP note writing ability and may increase their confidence in this area. The use of the rubric allows for greater reliability among multiple graders, supporting grading consistency.
- Published
- 2018
- Full Text
- View/download PDF
46. Extremely Low Frequency Electromagnetic Fields impair the Cognitive and Motor Abilities of Honey Bees.
- Author
-
Shepherd S, Lima MAP, Oliveira EE, Sharkh SM, Jackson CW, and Newland PL
- Subjects
- Animals, Bees, Cognition Disorders pathology, Memory Disorders pathology, Motor Disorders pathology, Cognition Disorders etiology, Electromagnetic Fields adverse effects, Learning radiation effects, Memory Disorders etiology, Motor Disorders etiology, Radiation Exposure adverse effects
- Abstract
Extremely low frequency electromagnetic field (ELF EMF) pollution from overhead powerlines is known to cause biological effects across many phyla, but these effects are poorly understood. Honey bees are important pollinators across the globe and due to their foraging flights are exposed to relatively high levels of ELF EMF in proximity to powerlines. Here we ask how acute exposure to 50 Hz ELF EMFs at levels ranging from 20-100 µT, found at ground level below powerline conductors, to 1000-7000 µT, found within 1 m of the conductors, affects honey bee olfactory learning, flight, foraging activity and feeding. ELF EMF exposure was found to reduce learning, alter flight dynamics, reduce the success of foraging flights towards food sources, and feeding. The results suggest that 50 Hz ELF EMFs emitted from powerlines may represent a prominent environmental stressor for honey bees, with the potential to impact on their cognitive and motor abilities, which could in turn reduce their ability to pollinate crops.
- Published
- 2018
- Full Text
- View/download PDF
47. Effects of ischemic preconditioning on mitochondrial and metabolic neruoprotection: 5' adenosine monophosphate-activated protein kinase and sirtuins.
- Author
-
Jackson CW, Escobar I, Xu J, and Perez-Pinzon MA
- Abstract
Stroke and cardiac arrest result in cerebral ischemia, a highly prevalent medical issue around the world, which is characterized by a reduction or loss of blood flow to the brain. The loss of adequate nutrient supply in the brain during ischemia results in neuronal cell death contributing to cognitive and motor deficits that are usually permanent. Current effective therapies for cerebral ischemia are only applicable after the fact. Thus, the development of preventative therapies of ischemia is imperative. A field of research that continues to show promise in developing therapies for cerebral ischemia is ischemic preconditioning (IPC). IPC is described as exposure to sublethal ischemic events, which induce adaptive changes that provide tolerance to future ischemic events. Through either transient sub-lethal ischemic events, or the actions of a preconditioning molecular mimetic, IPC typically results in augmented gene expression and cellular metabolism. A pivotal target of such changes in gene expression and metabolism is the mitochondrion. Direct and indirect effects on mitochondria by IPC can result in the activation of 5' adenosine monophosphate-activated protein kinase (AMPK), a master regulator of cellular metabolism. Changes in the activity of the posttranslational modifiers, SIRT1 and SIRT5, also contribute to the overall adaptive processes in cellular metabolism and mitochondrial functioning. In this review, we present recently collected evidence to highlight the neuroprotective interactions of mitochondria with AMPK, SIRT1, and SIRT5 in IPC. To produce this review, we utilized PubMed and previous reviews to target and to consolidate the relevant studies and lines of evidence., Competing Interests: There are no conflicts of interest.
- Published
- 2018
- Full Text
- View/download PDF
48. Exposure to extremely low frequency electromagnetic fields alters the behaviour, physiology and stress protein levels of desert locusts.
- Author
-
Wyszkowska J, Shepherd S, Sharkh S, Jackson CW, and Newland PL
- Subjects
- Action Potentials drug effects, Animals, Grasshoppers radiation effects, Muscle, Skeletal physiology, Muscle, Skeletal radiation effects, Neurons physiology, Neurons radiation effects, Temperature, Up-Regulation drug effects, Behavior, Animal radiation effects, Electromagnetic Fields, Grasshoppers metabolism, HSP70 Heat-Shock Proteins metabolism, Insect Proteins metabolism
- Abstract
Electromagnetic fields (EMFs) are present throughout the modern world and are derived from many man-made sources including overhead transmission lines. The risks of extremely-low frequency (ELF) electromagnetic fields are particularly poorly understood especially at high field strengths as they are rarely encountered at ground level. Flying insects, however, can approach close to high field strength transmission lines prompting the question as to how these high levels of exposure affect behaviour and physiology. Here we utilise the accessible nervous system of the locust to ask how exposure to high levels of ELF EMF impact at multiple levels. We show that exposure to ELF EMFs above 4 mT leads to reduced walking. Moreover, intracellular recordings from an identified motor neuron, the fast extensor tibiae motor neuron, show increased spike latency and a broadening of its spike in exposed animals. In addition, hind leg kick force, produced by stimulating the extensor tibiae muscle, was reduced following exposure, while stress-protein levels (Hsp70) increased. Together these results suggest that ELF EMF exposure has the capacity to cause dramatic effects from behaviour to physiology and protein expression, and this study lays the foundation to explore the ecological significance of these effects in other flying insects.
- Published
- 2016
- Full Text
- View/download PDF
49. The Effects of Diesel Exhaust Pollution on Floral Volatiles and the Consequences for Honey Bee Olfaction.
- Author
-
Lusebrink I, Girling RD, Farthing E, Newman TA, Jackson CW, and Poppy GM
- Subjects
- Animals, Bees physiology, Flowers chemistry, Gasoline analysis, Nitrogen Oxides chemistry, Odorants analysis, Air Pollutants chemistry, Bees drug effects, Smell drug effects, Vehicle Emissions, Volatile Organic Compounds chemistry
- Abstract
There is growing evidence of a substantial decline in pollinators within Europe and North America, most likely caused by multiple factors such as diseases, poor nutrition, habitat loss, insecticides, and environmental pollution. Diesel exhaust could be a contributing factor to this decline, since we found that diesel exhaust rapidly degrades floral volatiles, which honey bees require for flower recognition. In this study, we exposed eight of the most common floral volatiles to diesel exhaust in order to investigate whether it can affect volatile mediated plant-pollinator interaction. Exposure to diesel exhaust altered the blend of common flower volatiles significantly: myrcene was considerably reduced, β-ocimene became undetectable, and β-caryophyllene was transformed into its cis-isomer isocaryophyllene. Proboscis extension response (PER) assays showed that the alterations of the blend reduced the ability of honey bees to recognize it. The chemically reactive nitrogen oxides fraction of diesel exhaust gas was identified as capable of causing degradation of floral volatiles.
- Published
- 2015
- Full Text
- View/download PDF
50. Exposure to static electric fields leads to changes in biogenic amine levels in the brains of Drosophila.
- Author
-
Newland PL, Al Ghamdi MS, Sharkh S, Aonuma H, and Jackson CW
- Subjects
- Animals, Avoidance Learning, Brain metabolism, Choice Behavior, Female, Male, Biogenic Amines metabolism, Drosophila melanogaster physiology, Electromagnetic Fields adverse effects, Learning
- Abstract
Natural and anthropogenic static electric fields are commonly found in the environment and can have both beneficial and harmful effects on many animals. Here, we asked how the fruitfly responds to these fields and what the consequences of exposure are on the levels of biogenic amines in the brain. When given a choice in a Y-tube bioassay Drosophila avoided electric fields, and the greater the field strength the more likely Drosophila were to avoid it. By comparing wild-type flies, flies with wings surgically removed and vestigial winged flies we found that the presence of intact wings was necessary to produce avoidance behaviour. We also show that Coulomb forces produced by electric fields physically lift excised wings, with the smaller wings of males being raised by lower field strengths than larger female wings. An analysis of neurochemical changes in the brains showed that a suite of changes in biogenic amine levels occurs following chronic exposure. Taken together we conclude that physical movements of the wings are used by Drosophila in generating avoidance behaviour and are accompanied by changes in the levels of amines in the brain, which in turn impact on behaviour., (© 2015 The Author(s).)
- Published
- 2015
- Full Text
- View/download PDF
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