40 results on '"Bretz J"'
Search Results
2. Regulation and Detection of Effectors Translocated by Pseudomonas syringae
- Author
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Hutcheson, S. W., Bretz, J. R., Charity, J. C., Losada, L., Sussan, T., Iacobellis, Nicola Sante, editor, Collmer, Alan, editor, Hutcheson, Steven W., editor, Mansfield, John W., editor, Morris, Cindy E., editor, Murillo, Jesus, editor, Schaad, Norman W., editor, Stead, David E., editor, Surico, Giuseppe, editor, and Ullrich, Matthias S., editor
- Published
- 2003
- Full Text
- View/download PDF
3. In Vitro and In Vivo Characterization of a Novel Nonsteroidal, Species-Specific Progesterone Receptor Modulator, PRA-910
- Author
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Zhang, Z., primary, Lundeen, S. G., additional, Slayden, O., additional, Zhu, Y., additional, Cohen, J., additional, Berrodin, T. J., additional, Bretz, J., additional, Chippari, S., additional, Wrobel, J., additional, Zhang, P., additional, Fensome, A., additional, Winneker, R. C., additional, and Yudt, M. R., additional
- Published
- 2008
- Full Text
- View/download PDF
4. Dissociative symptoms are positively related to stress in borderline personality disorder
- Author
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Stiglmayr, C. E., Ebner-Priemer, U. W., Bretz, J., Behm, R., Mohse, M., Lammers, C.-H., Anghelescu, I.-G., Schmahl, C., Schlotz, W., Kleindienst, N., and Bohus, M.
- Published
- 2008
5. Eine Metaanalyse zur Wirksamkeit der Gestalttherapie
- Author
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Bretz, J., Heekerens, Hans-Peter, and Schmitz, B.
- Subjects
Institut für Psychologie - Published
- 1994
6. Results of a phase I study of clofarabine (CLO) plus cyclophosphamide (CY) in adult patients (pts) with relapsed and/or refractory acute lymphoblastic leukemia (ALL)
- Author
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Faderl, S., primary, Thomas, D. A., additional, Gandhi, V., additional, Huang, X., additional, Borthakur, G., additional, O'Brien, S., additional, Ravandi, F., additional, Plunkett, W., additional, Bretz, J. L., additional, and Kantarjian, H. M., additional
- Published
- 2009
- Full Text
- View/download PDF
7. Brücken und Hürden in der Versorgung von Patienten mit türkischem Migrationshintergrund bei Depression
- Author
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Temur-Erman, S, primary, Aichberger, M, additional, Rapp, M, additional, Bretz, J, additional, and Schouler-Ocak, M, additional
- Published
- 2008
- Full Text
- View/download PDF
8. Dissociative symptoms are positively related to stress in borderline personality disorder
- Author
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Stiglmayr, C. E., primary, Ebner-Priemer, U. W., additional, Bretz, J., additional, Behm, R., additional, Mohse, M., additional, Lammers, C.-H., additional, Anghelescu, I.-G., additional, Schmahl, C., additional, Schlotz, W., additional, Kleindienst, N., additional, and Bohus, M., additional
- Published
- 2007
- Full Text
- View/download PDF
9. Calciner design for lower CO and NOx using MI-CFD analysis to optimize “Hot-Reburn” Conditions.
- Author
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Nance, G., Abbas, T., Lowes, T., and Bretz, J.
- Published
- 2011
- Full Text
- View/download PDF
10. In Vitro and In Vivo Characterization of a Novel Nonsteroidal, Species-Specific Progesterone Receptor Modulator, PRA-910.
- Author
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Conneely, O., Otto, C., Zhang, Z., Lundeen, S. G., Slayden, O., Zhu, Y., Cohen, J., Berrodin, T. J., Bretz, J., Chippari, S., Wrobel, J., Zhang, P., Fensome, A., Winneker, R. C., and Yudt, M. R.
- Abstract
The progesterone receptor (PR) is an important regulator of female reproduction. Consequently, PR modulators have found numerous pharmaceutical utilities in women's reproductive health. In the process of identifying more receptor-specific and tissue-selective PR modulators, we discovered a novel nonsteroidal, 6-aryl benzoxazinone compound, PRA-910, that displays unique in vitro and in vivo activities. In a PR/PRE reporter assay in COS-7 cells, PRA-910 shows potent PR antagonist activity with an IC50 value of approximately 20 nM. In the alkaline phosphatase assay in the human breast cancer cell line T47D, PRA-910 is a partial progesterone antagonist at low concentrations and is also an effective PR agonist at higher concentrations (EC50 value of approximately 700 nM). PRA-910 binds to the human PR with high affinity (Kd=4 nM) and was previously shown to exhibit greater than 100-fold selectivity for the PR versus other steroid receptors. In the adult ovariectomized rat, PRA-910 is a potent PR antagonist. It inhibits progesterone-induced uterine decidual response with an ED50 value of 0.4 mg/kg, p.o., and reverses progesterone suppression of estradiol-induced complement C3 expression with potency similar to RU-486. In the nonhuman primate, however, PRA-910 is a PR agonist. The effect on endometrial histology strongly resembles that of progesterone. This unique compound also suppresses estradiol-induced epithelial cell proliferation and both estrogen and progesterone receptor expression in the uterine endometrium as a PR agonist would. In summary, PRA-910 is a structurally and biologically novel selective PR modulator with either PR agonist or antagonist activity, depending on context, concentration, and species. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF
11. Inflammatory cytokine regulation of TRAIL-mediated apoptosis in thyroid epithelial cells
- Author
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Bretz, J D, primary, Mezosi, E, additional, Giordano, T J, additional, Gauger, P G, additional, Thompson, N W, additional, and Baker, Jr, J R, additional
- Published
- 2002
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- View/download PDF
12. Specificity questions concerning the clone 33 anti-fas ligand antibody
- Author
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Baker, J R, primary and Bretz, J D, additional
- Published
- 2000
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13. C/EBP-related protein 2 confers lipopolysaccharide-inducible expression of interleukin 6 and monocyte chemoattractant protein 1 to a lymphoblastic cell line.
- Author
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Bretz, J D, primary, Williams, S C, additional, Baer, M, additional, Johnson, P F, additional, and Schwartz, R C, additional
- Published
- 1994
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14. 2-Methoxyestradiol, an endogenous estrogen metabolite, induces thyroid cell apoptosis
- Author
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Wang, S. H., Myc, A., Koenig, R. J., Bretz, J. D., Arscott, P. L., and Jr, J. R. Baker
- Published
- 2000
- Full Text
- View/download PDF
15. Inflammatory cytokine regulation of Fas-mediated apoptosis in thyroid follicular cells.
- Author
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Bretz, J D, Arscott, P L, Myc, A, and Baker, J R
- Abstract
The occurrence of apoptosis in thyroid follicular cells induced by Fas activation has been a subject of much debate. This is due, in part, to the fact that no physiologically relevant treatment conditions have been reported to cause rapid and extensive Fas-mediated apoptosis in thyroid cells, whereas treatment with the protein synthesis inhibitor cycloheximide prior to Fas activation allows for massive cell death. This indicates that the Fas signaling pathway is present but that its function is blocked in the overwhelming majority of cultured thyroid cells. To reconcile the conflicting reports, we set out to identify physiologically relevant conditions in which rapid, massive thyroid cell apoptosis in response to Fas activation could be demonstrated. We determined that susceptibility to Fas-activated apoptosis could be influenced by certain combinations of inflammatory cytokines. Although no single cytokine was effective, pretreatment of thyroid cells with the combination of gamma-interferon and either tumor necrosis factor-alpha or interleukin 1beta allowed for massive Fas-mediated apoptosis. Susceptibility to Fas-induced death correlated with an increase in expression of a tunicamycin-inhibitable high molecular weight form of Fas but not with aggregate expression of Fas.
- Published
- 1999
16. TRAIL death pathway expression and induction in thyroid follicular cells.
- Author
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Bretz, J D, Rymaszewski, M, Arscott, P L, Myc, A, Ain, K B, Thompson, N W, and Baker, J R
- Abstract
To determine whether programmed cell death in thyroid follicular cells can be related to activation of the tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) pathway, we examined the expression and function of this pathway in primary thyroid follicular cells and a papillary thyroid carcinoma cell line in vitro. Despite the expression of TRAIL receptors death receptor 4 and death receptor 5, purified TRAIL could not induce programmed cell death (PCD) in any of the thyroid follicular cells examined. However, pre-incubation with cycloheximide before TRAIL facilitated the induction of rapid and massive PCD. This suggested that despite the presence of a labile inhibitor of the TRAIL pathway, TRAIL could mediate PCD under appropriate conditions. To determine whether there were sources of TRAIL in the thyroid that could interact with thyroid follicular cell TRAIL receptors, RNase protection assays were used to determine TRAIL mRNA expression. TRAIL message was expressed in intrathyroidal lymphocytes isolated from a patient with thyroiditis, and unexpectedly, thyroid follicular cells themselves could be induced to express abundant TRAIL message in the presence of the inflammatory cytokines interferon gamma, tumor necrosis factor alpha, and interleukin 1beta. Furthermore, the papillary thyroid carcinoma cell line could be induced to kill the TRAIL-sensitive lymphoma cell line BJAB through a TRAIL-dependent mechanism.
- Published
- 1999
17. Factors Affecting the Performance of an Electrochemical Detector for the Reversed-Phase Liquid Chromatographic Separation of Small Peptides
- Author
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Bretz, J. T., primary and Brown, P. R., additional
- Published
- 1988
- Full Text
- View/download PDF
18. Machine learned daily life history classification using low frequency tracking data and automated modelling pipelines: application to North American waterfowl.
- Author
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Overton C, Casazza M, Bretz J, McDuie F, Matchett E, Mackell D, Lorenz A, Mott A, Herzog M, and Ackerman J
- Abstract
Background: Identifying animal behaviors, life history states, and movement patterns is a prerequisite for many animal behavior analyses and effective management of wildlife and habitats. Most approaches classify short-term movement patterns with high frequency location or accelerometry data. However, patterns reflecting life history across longer time scales can have greater relevance to species biology or management needs, especially when available in near real-time. Given limitations in collecting and using such data to accurately classify complex behaviors in the long-term, we used hourly GPS data from 5 waterfowl species to produce daily activity classifications with machine-learned models using "automated modelling pipelines"., Methods: Automated pipelines are computer-generated code that complete many tasks including feature engineering, multi-framework model development, training, validation, and hyperparameter tuning to produce daily classifications from eight activity patterns reflecting waterfowl life history or movement states. We developed several input features for modeling grouped into three broad categories, hereafter "feature sets": GPS locations, habitat information, and movement history. Each feature set used different data sources or data collected across different time intervals to develop the "features" (independent variables) used in models., Results: Automated modelling pipelines rapidly developed easily reproducible data preprocessing and analysis steps, identification and optimization of the best performing model and provided outputs for interpreting feature importance. Unequal expression of life history states caused unbalanced classes, so we evaluated feature set importance using a weighted F1-score to balance model recall and precision among individual classes. Although the best model using the least restrictive feature set (only 24 hourly relocations in a day) produced effective classifications (weighted F1 = 0.887), models using all feature sets performed substantially better (weighted F1 = 0.95), particularly for rarer but demographically more impactful life history states (i.e., nesting)., Conclusions: Automated pipelines generated models producing highly accurate classifications of complex daily activity patterns using relatively low frequency GPS and incorporating more classes than previous GPS studies. Near real-time classification is possible which is ideal for time-sensitive needs such as identifying reproduction. Including habitat and longer sequences of spatial information produced more accurate classifications but incurred slight delays in processing., (© 2022. The Author(s).)
- Published
- 2022
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19. The Differential Impact of Lockdown Measures Upon Migrant and Female Psychiatric Patients - A Cross-Sectional Survey in a Psychiatric Hospital in Berlin, Germany.
- Author
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Moran JK, Bretz J, Winkler J, Gutwinski S, Brandl EJ, and Schouler-Ocak M
- Abstract
The COVID-19 pandemic could have major effects on already vulnerable individuals with psychiatric disorders. It is important to assess how different patient groups respond to stress related to the pandemic, and what additional factors influence it, including family-related stress, migration background, and sex. We conducted a survey in a sample of 294 psychiatric patients in a large outpatient clinic in Berlin, measuring level of distress in relation to COVID-19 lockdown as well as family-related distress. We also measured potential influencing factors such as media consumption and medical support. In the migration background group, we found that women had more lockdown related psychological distress than men. This was not apparent in those patients with a German background. We found that females were more strongly affected by family-related distress, particularly those with a migration background. People with PTSD were most strongly affected by family-related distress, whereas people with psychotic disorders and addiction reported the least distress. There were no effects of media consumption. There were no differences in ability to abide by the lockdown related restrictions across diagnoses. Our results support earlier findings on differential vulnerability of diagnostic groups to these stressors. Thus, clinicians can optimize treatment by taking family-related stressors into account particularly for females and people with a migrant background., 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. The reviewer SW declared a shared affiliation, though no other collaboration, with the authors JM, JB, JW, SG, EB, MS-O, to the handling editor., (Copyright © 2021 Moran, Bretz, Winkler, Gutwinski, Brandl and Schouler-Ocak.)
- Published
- 2021
- Full Text
- View/download PDF
20. [Psychological stress during the COVID-19 pandemic: consequences for psychiatric patients and therapeutic implications].
- Author
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Winkler JG, Jalilzadeh Masah D, Moran JK, Bretz J, Tsagkas I, Goldschmidt T, and Schouler-Ocak M
- Subjects
- Anxiety, Communicable Disease Control, Germany epidemiology, Humans, Retrospective Studies, SARS-CoV-2, Stress, Psychological epidemiology, COVID-19, Pandemics
- Abstract
Background: The outbreak of the COVID-19 disease and the rapid spread of the inducing coronavirus SARS-CoV‑2 threatens not only people's physical health but also their mental health. Its influence on incidence and course of existing illnesses in the psychiatric outpatient sector in Germany is still unknown., Methods: The medical reports of 682 persons in psychiatric treatment were retrospectively investigated, regarding their subjective response to this pandemic and its clinical relevance., Results: Of the patients 60.5% (n = 378) experienced greater psychological stress, 14.5% (n = 99) reported fear of the SARS-CoV‑2 and the possible danger of infection, 25.5% (n = 174) reported fear resulting from the protective measures taken (lock down) and 4.3% (n = 29) reported fear of both. This differed significantly across diagnoses: people with anxiety disorders reported significantly greater stress as well as greater fear of the virus, whereas people with psychoses were significantly less affected than the other patients. Of the participants 43.7% (n = 132) were so strongly affected that acute treatment had to be implemented and 6.0% (n = 18) had to be referred to inpatient care., Discussion: People with mental illnesses are particularly vulnerable to the psychological strain of the COVID-19 pandemic. Long-term studies on the further course of disease will be necessary. Additional studies that test interventions to build resilience in this population will also be needed.
- Published
- 2021
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- View/download PDF
21. [Cultural Influence on Attitude towards Psychotherapy - A Comparison of Individuals of Turkish Origin with Individuals without Migration Background].
- Author
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Bretz J, Sahin D, Brandl EJ, and Schouler-Ocak M
- Subjects
- Adult, Cross-Cultural Comparison, Female, Germany, Humans, Male, Middle Aged, Psychiatric Status Rating Scales, Socioeconomic Factors, Surveys and Questionnaires, Transients and Migrants, Turkey ethnology, Attitude, Culture, Emigrants and Immigrants psychology, Psychotherapy
- Abstract
Aim: The present study compares the attitude towards psychotherapy of persons living in Germany with or without Turkish background. In this context, gender-related, disorder-specific and sociodemographic differences in openness towards psychotherapy are taken into account., Methods: Individuals of Turkish origin (n=129) and individuals without migration background (n=129) were interviewed with the Questionnaire on Attitudes towards Psychotherapeutic Treatment, the Social Support Questionnaire, a short version of the Symptom-Checklist with the subscales anxiety, depression and somatization, and a sociodemographic questionnaire., Results: The attitude towards psychotherapy is less positive in Turkish migrants than in people without migration background. Females, depressive individuals, persons with high social support, with children and a high level of education are more open towards psychotherapy., Discussion: The attitude towards psychotherapy is influenced by gender, socio-demographic and disorder-specific factors and in particular by cultural factors., Conclusion: These results elucidate the need for better information about psychotherapy and the development of intercultural consulting services for migrants in Germany., Competing Interests: Die Autoren geben an, dass kein Interessenkonflikt besteht., (© Georg Thieme Verlag KG Stuttgart · New York.)
- Published
- 2019
- Full Text
- View/download PDF
22. [Clinical and sociodemographic Differences Between Patients with and without Migration Background in a Psychiatric Outpatient Service].
- Author
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Brandl EJ, Dietrich N, Mell N, Winkler J, Gutwinski S, Bretz J, and Schouler-Ocak M
- Subjects
- Germany, Humans, Outpatients, Socioeconomic Factors, Ambulatory Care, Emigrants and Immigrants psychology, Mental Disorders
- Abstract
Objective: A better understanding of specific sociodemographic and clinical factors in patients with migration background may help to significantly improve psychiatric treatment outcome of these patients. Therefore, we investigated these factors in a large sample of psychiatric outpatients., Methods: N = 423 psychiatric patients of a large outpatient service were assessed for sociodemographic variables as well as clinical variables including diagnosis, psychopharmacological treatment, treatment duration and current symptom load (SCL-14)., Results: We found significant differences between patients with and without migration background in terms of sociodemographic and clinical factors such as education, employment and main diagnose. Patients with migration background had a significantly higher current symptom load, especially for somatic symptoms., Conclusion: The data underline the large differences between patients with and without migration background regarding sociodemographic and clinical factors. These differences should be considered in psychiatric treatment of these patients., Competing Interests: Die Autoren geben an, dass kein Interessenkonflikt besteht., (© Georg Thieme Verlag KG Stuttgart · New York.)
- Published
- 2018
- Full Text
- View/download PDF
23. [What do Interpreters Cost? - A Retrospective Analysis of the Costs for Interpreters in Treatment of Refugees in a Psychiatric Outpatient Clinic in Berlin].
- Author
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Schreiter S, Winkler J, Bretz J, and Schouler-Ocak M
- Subjects
- Berlin, Communication Barriers, Costs and Cost Analysis, Ethnopsychology economics, Hospitals, Psychiatric economics, Mood Disorders economics, Mood Disorders therapy, National Health Programs economics, Neurotic Disorders economics, Neurotic Disorders therapy, Retrospective Studies, Somatoform Disorders economics, Somatoform Disorders therapy, Stress Disorders, Post-Traumatic economics, Stress Disorders, Post-Traumatic therapy, Culturally Competent Care economics, Health Care Costs statistics & numerical data, Mental Disorders economics, Mental Disorders therapy, Outpatient Clinics, Hospital economics, Refugees psychology, Translating
- Abstract
Clinical diagnostics of mental disorders especially among refugees and asylum seekers come with unique difficulties: language barriers, different forms of expression and concepts of the understanding of mental illness as well as a different cultural background. Therefore professional interpreters are needed but associated with a higher effort related to costs and time. We conducted a retrospective analysis of costs, which incurred by the use of professional interpreters in our outpatient clinic in Berlin, Germany, in the first quarter 2016 for the treatment of refugees and asylum seekers. The sample consisted of 110 refugees and asylum seekers; the highest costs in the use of interpreters incurred among Neurotic, stress-related and somatoform disorders (53.04%), especially Posttraumatic Stress Disorder (39.04%), as well as affective disorders (38.47%), especially major depressive episodes (25.23%). Our data point out the crucial need of a regulation of costs with regard to the service of professional interpreters in Germany., (© Georg Thieme Verlag KG Stuttgart · New York.)
- Published
- 2016
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24. Prolonged early G(1) arrest by selective CDK4/CDK6 inhibition sensitizes myeloma cells to cytotoxic killing through cell cycle-coupled loss of IRF4.
- Author
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Huang X, Di Liberto M, Jayabalan D, Liang J, Ely S, Bretz J, Shaffer AL 3rd, Louie T, Chen I, Randolph S, Hahn WC, Staudt LM, Niesvizky R, Moore MA, and Chen-Kiang S
- Subjects
- Animals, Apoptosis genetics, Boronic Acids administration & dosage, Boronic Acids pharmacology, Bortezomib, Cell Cycle drug effects, Cell Cycle genetics, Cell Line, Tumor, Cyclin-Dependent Kinase 4 antagonists & inhibitors, Cyclin-Dependent Kinase 6 antagonists & inhibitors, Cytotoxins administration & dosage, Cytotoxins pharmacology, Down-Regulation drug effects, Down-Regulation genetics, Drug Resistance, Neoplasm drug effects, Drug Synergism, G1 Phase Cell Cycle Checkpoints genetics, G1 Phase Cell Cycle Checkpoints physiology, Gene Expression Regulation, Neoplastic drug effects, Humans, Interferon Regulatory Factors metabolism, Mice, Mice, Inbred NOD, Mice, SCID, Mice, Transgenic, Multiple Myeloma genetics, Multiple Myeloma pathology, Protein Kinase Inhibitors administration & dosage, Pyrazines administration & dosage, Pyrazines pharmacology, Substrate Specificity, Time Factors, Xenograft Model Antitumor Assays, Apoptosis drug effects, G1 Phase Cell Cycle Checkpoints drug effects, Interferon Regulatory Factors genetics, Multiple Myeloma drug therapy, Protein Kinase Inhibitors pharmacology
- Abstract
Dysregulation of cyclin-dependent kinase 4 (CDK4) and CDK6 by gain of function or loss of inhibition is common in human cancer, including multiple myeloma, but success in targeting CDK with broad-spectrum inhibitors has been modest. By selective and reversible inhibition of CDK4/CDK6, we have developed a strategy to both inhibit proliferation and enhance cytotoxic killing of cancer cells. We show that induction of prolonged early-G(1) arrest (pG1) by CDK4/CDK6 inhibition halts gene expression in early-G(1) and prevents expression of genes programmed for other cell-cycle phases. Removal of the early-G(1) block leads to S-phase synchronization (pG1-S) but fails to completely restore scheduled gene expression. Consequently, the IRF4 protein required to protect myeloma cells from apoptosis is markedly reduced in pG1 and further in pG1-S in response to cytotoxic agents, such as the proteasome inhibitor bortezomib. The coordinated loss of IRF4 and gain of Bim sensitize myeloma tumor cells to bortezomib-induced apoptosis in pG1 in the absence of Noxa and more profoundly in pG1-S in cooperation with Noxa in vitro. Induction of pG1 and pG1-S by reversible CDK4/CDK6 inhibition further augments tumor-specific bortezomib killing in myeloma xenografts. Reversible inhibition of CDK4/CDK6 in sequential combination therapy thus represents a novel mechanism-based cancer therapy.
- Published
- 2012
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- View/download PDF
25. Noxa mediates p18INK4c cell-cycle control of homeostasis in B cells and plasma cell precursors.
- Author
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Bretz J, Garcia J, Huang X, Kang L, Zhang Y, Toellner KM, and Chen-Kiang S
- Subjects
- Animals, Apoptosis genetics, Apoptosis physiology, Cell Cycle genetics, Cell Cycle physiology, Cell Differentiation genetics, Cell Differentiation physiology, Cyclin-Dependent Kinase Inhibitor p18 deficiency, Cyclin-Dependent Kinase Inhibitor p18 genetics, HEK293 Cells, Hematopoietic Stem Cells cytology, Hematopoietic Stem Cells physiology, Homeostasis genetics, Homeostasis physiology, Humans, Immunoglobulin G biosynthesis, Leukocyte Common Antigens metabolism, Mice, Mice, Inbred C57BL, Mice, Knockout, Mice, Transgenic, Models, Biological, Positive Regulatory Domain I-Binding Factor 1, Proto-Oncogene Proteins c-bcl-2 antagonists & inhibitors, Proto-Oncogene Proteins c-bcl-2 deficiency, Proto-Oncogene Proteins c-bcl-2 genetics, Proto-Oncogene Proteins c-bcl-6 genetics, Proto-Oncogene Proteins c-bcl-6 physiology, RNA, Small Interfering genetics, Syndecan-1 metabolism, Transcription Factors genetics, Transcription Factors physiology, bcl-X Protein genetics, bcl-X Protein physiology, B-Lymphocytes cytology, B-Lymphocytes physiology, Cyclin-Dependent Kinase Inhibitor p18 physiology, Plasma Cells cytology, Plasma Cells physiology, Proto-Oncogene Proteins c-bcl-2 physiology
- Abstract
Inhibition of Cdk4/Cdk6 by p18(INK4c) (p18) is pivotal for generation of noncycling immunoglobulin (Ig)-secreting plasma cells (PCs). In the absence of p18, CD138(+) plasmacytoid cells continue to cycle and turnover rapidly, suggesting that p18 controls PC homeostasis. We now show that p18 selectively acts in a rare population of rapidly cycling CD138(hi)/B220(hi) intermediate PCs (iPCs). While retaining certain B-cell signatures, iPCs are poised to differentiate to end-stage PCs although the majority undergo apoptosis. p18 is dispensable for the development of the PC transcriptional circuitry, and Blimp-1 and Bcl-6 are expressed fully and mutually exclusively in individual iPCs. However, a minor proportion of iPCs express both, and they are preferentially protected by p18 or Bcl-xL overexpression, consistent with expansion of the iPC pool by Bcl-xL overexpression, or loss of proapoptotic Bim or Noxa. Expression of Noxa is induced during B-cell activation, peaks in iPCs, and selectively repressed by p18. It is required to promote apoptosis of cycling B cells, especially in the absence of p18. These findings define the first physiologic function for Noxa and suggest that by repressing Noxa, induction of G₁ arrest by p18 bypasses a homeostatic cell-cycle checkpoint in iPCs for PC differentiation.
- Published
- 2011
- Full Text
- View/download PDF
26. Apoptotic activities in closely related styryllactone stereoisomers toward human tumor cell lines: Investigation of synergism of styryllactone-induced apoptosis with TRAIL.
- Author
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Gupta S, Poeppelman L, Hinman CL, Bretz J, Hudson RA, and Tillekeratne LM
- Subjects
- Antineoplastic Agents chemical synthesis, Antineoplastic Agents chemistry, Cell Survival drug effects, Drug Screening Assays, Antitumor, Humans, Lactones chemical synthesis, Lactones chemistry, Molecular Conformation, Stereoisomerism, Structure-Activity Relationship, TNF-Related Apoptosis-Inducing Ligand chemistry, Tumor Cells, Cultured, Antineoplastic Agents pharmacology, Apoptosis drug effects, Lactones pharmacology, TNF-Related Apoptosis-Inducing Ligand metabolism
- Abstract
A related series of styryllactones with small functional and stereochemical variations were compiled for a comparative study of their apoptotic activities toward two tumorigenic and one non-tumorigenic control cell line. While a substantial range of intrinsic activity was observed, the relative order of activity of the different compounds toward the cell types varied somewhat as did the relative ratios of apoptosis and necrosis observed in conjunction with the loss of cell viability. While some of the styryllactones showed substantial activity, a small but significant apoptosis-induced synergism was demonstrated with (-)-altholactone and TRAIL (tumor necrosis factor-related apoptosis-inducing ligand)., (Copyright 2009 Elsevier Ltd. All rights reserved.)
- Published
- 2010
- Full Text
- View/download PDF
27. In vitro and in vivo characterization of a novel nonsteroidal, species-specific progesterone receptor modulator, PRA-910.
- Author
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Zhang Z, Lundeen SG, Slayden O, Zhu Y, Cohen J, Berrodin TJ, Bretz J, Chippari S, Wrobel J, Zhang P, Fensome A, Winneker RC, and Yudt MR
- Subjects
- Animals, COS Cells, Cell Line, Tumor, Chlorocebus aethiops, Female, Heterocyclic Compounds, 2-Ring metabolism, Humans, In Vitro Techniques, Male, Nitriles metabolism, Rats, Rats, Sprague-Dawley, Receptors, Progesterone metabolism, Species Specificity, Two-Hybrid System Techniques, Heterocyclic Compounds, 2-Ring pharmacology, Nitriles pharmacology, Receptors, Progesterone drug effects
- Abstract
The progesterone receptor (PR) is an important regulator of female reproduction. Consequently, PR modulators have found numerous pharmaceutical utilities in women's reproductive health. In the process of identifying more receptor-specific and tissue-selective PR modulators, we discovered a novel nonsteroidal, 6-aryl benzoxazinone compound, PRA-910, that displays unique in vitro and in vivo activities. In a PR/PRE reporter assay in COS-7 cells, PRA-910 shows potent PR antagonist activity with an IC50 value of approximately 20 nM. In the alkaline phosphatase assay in the human breast cancer cell line T47D, PRA-910 is a partial progesterone antagonist at low concentrations and is also an effective PR agonist at higher concentrations (EC50 value of approximately 700 nM). PRA-910 binds to the human PR with high affinity (Kd = 4 nM) and was previously shown to exhibit greater than 100-fold selectivity for the PR versus other steroid receptors. In the adult ovariectomized rat, PRA-910 is a potent PR antagonist. It inhibits progesterone-induced uterine decidual response with an ED50 value of 0.4 mg/kg, p.o., and reverses progesterone suppression of estradiol-induced complement C3 expression with potency similar to RU-486. In the nonhuman primate, however, PRA-910 is a PR agonist. The effect on endometrial histology strongly resembles that of progesterone. This unique compound also suppresses estradiol-induced epithelial cell proliferation and both estrogen and progesterone receptor expression in the uterine endometrium as a PR agonist would. In summary, PRA-910 is a structurally and biologically novel selective PR modulator with either PR agonist or antagonist activity, depending on context, concentration, and species.
- Published
- 2007
28. Lon protease functions as a negative regulator of type III protein secretion in Pseudomonas syringae.
- Author
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Bretz J, Losada L, Lisboa K, and Hutcheson SW
- Subjects
- ATP-Dependent Proteases, Arabidopsis microbiology, Bacterial Proteins biosynthesis, Bacterial Proteins classification, Bacterial Proteins genetics, DNA-Binding Proteins genetics, Escherichia coli genetics, Escherichia coli metabolism, Escherichia coli Proteins physiology, Gene Expression Regulation, Bacterial, Genes, Bacterial, Heat-Shock Proteins genetics, Molecular Sequence Data, Mutagenesis, Insertional, Promoter Regions, Genetic genetics, Regulon genetics, Sequence Deletion, Serine Endopeptidases genetics, Species Specificity, Transcription, Genetic, Bacterial Proteins metabolism, Bacterial Proteins physiology, DNA-Binding Proteins metabolism, Heat-Shock Proteins physiology, Protease La, Pseudomonas physiology, Serine Endopeptidases physiology, Sigma Factor, Transcription Factors
- Abstract
The central conserved region of the Pseudomonas syringae hrp pathogenicity island encodes a type III protein secretion system (TTSS) that is required for pathogenicity in plants. Expression of the hrp TTSS is controlled by the alternative sigma factor, HrpL, whose expression, in turn, is positively controlled by two truncated enhancer binding proteins, HrpR and HrpS. Although a number of environmental conditions are known to modulate hrp TTSS expression, such as stringent conditions and pathogenesis, the mechanism by which the activities of these transcriptional factors are modulated had not been established. In this study, HrpR and HrpS were found to be constitutively expressed under conditions in which the hrpL promoter was inactive. To identify a postulated negative regulator of hrpL expression, transposome (Tz) mutagenesis was used to isolate hrp constitutive mutants. P. syringae Pss61 and DC3000 hrp constitutive mutants were identified that carried lon::Tz insertions and exhibited increased cell length and UV sensitivity typical of Delta lon mutants. The P. syringae Lon protease retained structural features of its homologues found in other bacteria and was capable of complementing an Escherichia coli Delta lon mutant. P. syringae lon::Tz mutants exhibited enhanced expression of the hrpL promoter, suggesting an effect on HrpR and/or HrpS. HrpR was observed to be unstable in wild-type P. syringae strains grown in non-inductive media. However, the apparent half-life increased more than 10-fold in the P. syringae lon::Tz mutants or upon transfer to an inductive medium. The P. syringae lon mutants elicited rapidly developing plant responses and were shown to hypersecrete effector proteins, such as AvrPto. These results indicate that expression of the hrp regulon and type III secretion are negatively regulated by Lon-mediated degradation of HrpR.
- Published
- 2002
- Full Text
- View/download PDF
29. Enhancer-binding proteins HrpR and HrpS interact to regulate hrp-encoded type III protein secretion in Pseudomonas syringae strains.
- Author
-
Hutcheson SW, Bretz J, Sussan T, Jin S, and Pak K
- Subjects
- Base Sequence, DNA-Binding Proteins genetics, DNA-Directed RNA Polymerases, Escherichia coli Proteins, Molecular Sequence Data, Operon, Promoter Regions, Genetic genetics, Pseudomonas genetics, Pseudomonas pathogenicity, RNA Polymerase Sigma 54, Reverse Transcriptase Polymerase Chain Reaction, Sigma Factor, Two-Hybrid System Techniques, Bacterial Proteins genetics, Bacterial Proteins metabolism, DNA-Binding Proteins metabolism, Gene Expression Regulation, Bacterial, Pseudomonas metabolism, Transcription Factors
- Abstract
In Pseudomonas syringae strains, the hrp-hrc pathogenicity island consists of an HrpL-dependent regulon that encodes a type III protein translocation complex and translocated effector proteins required for pathogenesis. HrpR and HrpS function as positive regulatory factors for the hrpL promoter, but their mechanism of action has not been established. Both HrpR and HrpS are structurally related to enhancer-binding proteins, but they lack receiver domains and do not appear to require a cognate protein kinase for activity. hrpR and hrpS were shown to be expressed as an operon: a promoter was identified 5' to hrpR, and reverse transcriptase PCR detected the presence of an hrpRS transcript. The hrpR promoter and coding sequence were conserved among P. syringae strains. The coding sequences for hrpR and hrpS were cloned into compatible expression vectors, and their activities were monitored in Escherichia coli transformants carrying an hrpL'-lacZ fusion. HrpS could function as a weak activator of the hrpL promoter, but the activity was only 2.5% of the activity detected when both HrpR and HrpS were expressed in the reporter strain. This finding is consistent with a requirement for both HrpR and HrpS in the activation of the hrpL promoter. By using a yeast two-hybrid assay, an interaction between HrpR and HrpS was detected, suggestive of the formation of a heteromeric complex. Physical interaction of HrpR and HrpS was confirmed by column-binding experiments. The results show that HrpR and HrpS physically interact to regulate the sigma(54)-dependent hrpL promoter in P. syringae strains.
- Published
- 2001
- Full Text
- View/download PDF
30. Apoptosis and autoimmune thyroid disease: following a TRAIL to thyroid destruction?
- Author
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Bretz JD and Baker JR Jr
- Subjects
- Apoptosis Regulatory Proteins, Fas Ligand Protein, Humans, Ligands, Models, Immunological, TNF-Related Apoptosis-Inducing Ligand, Thyroiditis, Autoimmune pathology, fas Receptor immunology, Apoptosis immunology, Membrane Glycoproteins immunology, Thyroiditis, Autoimmune immunology, Tumor Necrosis Factor-alpha immunology
- Published
- 2001
- Full Text
- View/download PDF
31. Defining thyroid cell death.
- Author
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Bretz JD
- Subjects
- Humans, Thyroid Gland pathology, Thyroiditis, Autoimmune pathology, Thyroiditis, Autoimmune physiopathology, Apoptosis physiology, Thyroid Gland physiopathology
- Published
- 2001
- Full Text
- View/download PDF
32. Thyroid cell apoptosis. A new understanding of thyroid autoimmunity.
- Author
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Phelps E, Wu P, Bretz J, and Baker JR Jr
- Subjects
- Animals, Homeostasis, Humans, Apoptosis, Autoimmune Diseases pathology, Thyroid Diseases immunology, Thyroid Gland immunology, Thyroid Gland pathology
- Abstract
Apoptosis is a highly regulated mechanism of cell death involved in normal development, immune regulation, and homeostasis. Abnormal apoptotic activity has been implicated in a variety of diseases including cancer, autoimmunity, and degenerative disorders. In the thyroid, altered cell death may play a role in the pathogenesis of autoimmune disorders such as Hashimoto's thyroiditis and Graves' disease. Apoptosis-signaling pathways can be initiated through activation of death receptors or in response to cellular damage, such as in gamma irradiation. It has been demonstrated that Fas, tumor necrosis factor, and tumor necrosis factor-related apoptosis-inducing ligand pathways are present and functional in the thyroid, although the expression of these molecules and their roles in thyroid autoimmunity have been debated. Thyroid apoptosis is regulated at multiple levels, including receptor and ligand expression, and the expression of antiapoptotic proteins, such as FAP-1 and Bcl-2. These factors may provide potential mechanisms for modifying the pathogenesis of autoimmune thyroid disease.
- Published
- 2000
- Full Text
- View/download PDF
33. Characterization of FAP-1 expression and function in thyroid follicular cells.
- Author
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Myc A, Arscott PL, Bretz JD, Thompson NW, and Baker JR Jr
- Subjects
- Apoptosis, Cycloheximide pharmacology, Flow Cytometry, Humans, Immunohistochemistry, Protein Phosphatase 1, Protein Synthesis Inhibitors pharmacology, Protein Tyrosine Phosphatase, Non-Receptor Type 13, RNA, Messenger analysis, Thyroid Gland chemistry, fas Receptor physiology, Carrier Proteins genetics, Carrier Proteins physiology, Gene Expression, Protein Tyrosine Phosphatases genetics, Protein Tyrosine Phosphatases physiology, Thyroid Gland metabolism
- Abstract
Human thyrocytes are resistant to Fas-mediated programmed cell death (PCD). It has been reported that a labile protein inhibitor is involved in the protection of thyrocytes from PCD, and its action can be reversed by incubation of thyrocytes with cycloheximide (CHX) during treatment with agonist anti-Fas Ab. Fas-associated phosphatase-1 (FAP-1) is a protein that has been shown to interact with the negative regulatory domain of Fas and block Fas-mediated apoptosis in FAP-1 transfected Jurkat cells. We investigated the possibility that FAP-1 might be involved in protection against Fas-mediated PCD in human thyrocytes. FAP-1 mRNA was detected in primary thyrocytes using a ribonuclease protection assay. The presence of FAP-1 protein was confirmed by immunohistochemical staining and flow cytometry using a polyclonal anti-FAP-1 Ab. FAP-1 protein also disappeared from thyroid cells in response to CHX. To determine whether FAP-1 is a functional inhibitor of PCD in thyrocytes, we incubated thyrocytes with synthetic SLV (Ac-SLV) tripeptide to compete with Fas for interaction with FAP-1. Thyrocytes treated with Ac-SLV tripeptide showed significantly increased cell death as compared to cells treated with control tripeptide. In addition, in the presence of a suboptimal concentration of CHX, the Ac-SLV tripeptide yielded a strong, synergistic increase in Fas-mediated PCD as compared to thyrocytes treated with control tripeptide. These results implicate FAP-1 as a regulator of Fas-induced PCD in thyrocytes.
- Published
- 1999
- Full Text
- View/download PDF
34. The role of Fas-mediated apoptosis in thyroid autoimmune disease.
- Author
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Borgerson KL, Bretz JD, and Baker JR Jr
- Subjects
- Animals, Autoimmune Diseases pathology, Humans, Signal Transduction, Thyroid Diseases pathology, Thyroid Gland immunology, Thyroiditis, Autoimmune immunology, Apoptosis, Autoimmune Diseases immunology, Thyroid Diseases immunology, fas Receptor immunology
- Abstract
Apoptosis is a carefully regulated mechanism of cell death that differs from necrosis and plays an important role in normal tissue development and homeostasis, as well as disease processes. Apoptosis also plays an important role in autoimmunity. Defective apoptosis can cause systemic autoimmunity by allowing the survival of autoreactive lymphocytes. It may also be involved in the pathogenesis of organ-specific autoimmune diseases, such as Hashimoto's thyroiditis, through altered target organ susceptibility. Apoptosis signaling pathways can be initiated through activation of death receptors. One of these pathways employs the death receptor Fas and its ligand (FasL). Fas expression and death pathway signaling have been demonstrated in the thyroid, but there is controversy surrounding the expression of FasL and its role in thyroid autoimmunity. A number of proteins, including FAP-1, Bcl-2 and I-FLICE may regulate the Fas pathway in the thyroid and provide potential mechanisms for modifying the pathogenesis of autoimmune thyroid disease.
- Published
- 1999
- Full Text
- View/download PDF
35. Fas (APO-1, CD95)-mediated apoptosis in thyroid cells is regulated by a labile protein inhibitor.
- Author
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Arscott PL, Knapp J, Rymaszewski M, Bartron JL, Bretz JD, Thompson NW, and Baker JR Jr
- Subjects
- Antibodies, Monoclonal immunology, Cells, Cultured, Cycloheximide pharmacology, Drug Stability, Female, Humans, Male, Protein Synthesis Inhibitors pharmacology, Proteins antagonists & inhibitors, RNA, Messenger metabolism, Thyroid Gland metabolism, fas Receptor genetics, fas Receptor metabolism, Apoptosis physiology, Thyroid Gland cytology, Thyroid Gland physiology, fas Receptor physiology
- Abstract
To determine whether thyroid cell apoptosis observed in autoimmune thyroid disease could be related to activation of the Fas pathway, we examined the expression and function of Fas on thyroid follicular cells in vitro. Fas messenger RNA was found to be present using two different techniques and was expressed at equal levels in thyrocytes cultured either in the presence or absence of TSH. Fas antigen protein expression was demonstrated by Western blot of thyroid cell lysates and by immunohistochemical staining of thyrocytes, and the amount of Fas protein present did not appear to vary regardless of culture conditions. Despite expressing substantial amounts of Fas protein, thyrocytes treated with anti-Fas monoclonal antibody failed to undergo apoptosis. The addition of either interferon-gamma or interleukin-1beta to the anti-Fas-treated cell cultures also did not promote apoptotic signaling through this pathway. In contrast, the concomitant administration of cycloheximide allowed the induction of apoptosis through the activation of Fas in thyrocytes. These results suggest that Fas is constitutively expressed in thyrocytes, but that the induction of apoptosis through the Fas pathway is blocked by a labile protein inhibitor.
- Published
- 1997
- Full Text
- View/download PDF
36. FLICE, a novel FADD-homologous ICE/CED-3-like protease, is recruited to the CD95 (Fas/APO-1) death--inducing signaling complex.
- Author
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Muzio M, Chinnaiyan AM, Kischkel FC, O'Rourke K, Shevchenko A, Ni J, Scaffidi C, Bretz JD, Zhang M, Gentz R, Mann M, Krammer PH, Peter ME, and Dixit VM
- Subjects
- Amino Acid Sequence, Breast Neoplasms, Caenorhabditis elegans Proteins, Carcinoma, Carrier Proteins chemistry, Carrier Proteins metabolism, Caspase 8, Caspase 9, Cysteine Endopeptidases chemistry, Cysteine Endopeptidases metabolism, Cysteine Proteinase Inhibitors pharmacology, Fas-Associated Death Domain Protein, Granzymes, Helminth Proteins chemistry, Helminth Proteins genetics, Humans, Molecular Sequence Data, Organ Specificity, Protein Binding, RNA, Messenger analysis, Sequence Analysis, Sequence Homology, Amino Acid, Serine Endopeptidases, Signal Transduction physiology, Tumor Cells, Cultured, Adaptor Proteins, Signal Transducing, Apoptosis physiology, Carrier Proteins genetics, Caspases, Cysteine Endopeptidases genetics, fas Receptor physiology
- Abstract
To identify CAP3 and CAP4, components of the CD95 (Fas/APO-1) death-inducing signaling complex, we utilized nano-electrospray tandem mass spectrometry, a recently developed technique to sequence femtomole quantities of polyacrylamide gel-separated proteins. Interestingly, CAP4 encodes a novel 55 kDa protein, designated FLICE, which has homology to both FADD and the ICE/CED-3 family of cysteine proteases. FLICE binds to the death effector domain of FADD and upon overexpression induces apoptosis that is blocked by the ICE family inhibitors, CrmA and z-VAD-fmk. CAP3 was identified as the FLICE prodomain which likely remains bound to the receptor after proteolytic activation. Taken together, this is unique biochemical evidence to link a death receptor physically to the proapoptotic proteases of the ICE/CED-3 family.
- Published
- 1996
- Full Text
- View/download PDF
37. Antigen presentation after macrophage lineage switch of CD5 pre-B cells.
- Author
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Bretz JD, Chen SC, and Schwartz RC
- Subjects
- Animals, Bone Marrow immunology, CD5 Antigens, Cell Line, Transformed, Lymphoma, B-Cell genetics, Mice, Moloney murine leukemia virus genetics, Retroviridae genetics, Antigen-Presenting Cells immunology, Antigens, CD immunology, B-Lymphocytes immunology, Genes, ras, Lymphoma, B-Cell immunology, Macrophages immunology
- Published
- 1992
- Full Text
- View/download PDF
38. Lineage switch macrophages can present antigen.
- Author
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Bretz JD, Chen SC, Redenius D, Chang HL, Esselman WJ, and Schwartz RC
- Subjects
- Animals, Base Sequence, Cell Line, Transformed, Genes, ras, Histocompatibility Antigens Class II biosynthesis, Leukocyte Common Antigens biosynthesis, Mice, Mice, Inbred BALB C, Mice, Nude, Molecular Sequence Data, Polymerase Chain Reaction, Tumor Cells, Cultured, Antigen Presentation physiology, B-Lymphocytes physiology, Cell Differentiation physiology, Macrophages physiology
- Abstract
Recent reports of "lineage switching" from a lymphoid to macrophage phenotype have left unresolved the question of whether such cells are functional macrophages or nonfunctional products of differentiation gone awry. This study demonstrates that several "macrophage-like" cell lines derived from v-Ha-ras-transformed pre-B cells have gained the capacity to effectively present antigen in MHC-restricted fashion. Using an assay involving the cocultivation of putative antigen-presenting cells with chicken ovalbumin (cOVA) and a cOVA-specific T-cell hybridoma, "lineage switch" cell lines were found to present antigen as effectively as macrophage-containing peritoneal exudates. Neither the original pre-B-cell precursors nor B-cell lymphomas derived from them present antigen. Thus, we have demonstrated that these "lineage switch" macrophages are capable of antigen presentation, a mature differentiated function. While gaining macrophage characteristics, these cells have also rearranged their kappa light-chain immunoglobulin locus, suggesting that macrophage differentiation and immunoglobulin rearrangement are not mutually exclusive processes. The existence of both lymphoid and myeloid characteristics in a cell fully capable of antigen presentation suggests greater plasticity in hematopoietic lineage commitment than conventionally thought to be the case.
- Published
- 1992
- Full Text
- View/download PDF
39. A primer for first-time computer buyers.
- Author
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Bretz J
- Subjects
- Computers economics
- Published
- 1986
40. Born to be poor: birthplace and number of brothers and sisters as factors in adult poverty.
- Author
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Orshansky M and Bretz JS
- Subjects
- Educational Status, Humans, Occupations, Statistics as Topic, United States, Family Characteristics, Poverty, Residence Characteristics
- Abstract
Household heads who grew up as members of large families and/or as natives of small towns or rural areas tend to have less education and are more likely to be poor than those coming from small families and/or large cities. Data to support these conclusions have been drawn from two independent sources--a special Social Security Administration supplement to the April 1968 Current Population Survey and findings from the Retirement History Study conducted by the Social Security Administration.
- Published
- 1976
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