6 results on '"Caroline Mansfield"'
Search Results
2. Sensitivity of canine hematological cancers to BH3 mimetics
- Author
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Selvi Jegatheeson, Claire Cannon, Caroline Mansfield, Joanne Devlin, and Andrew Roberts
- Subjects
apoptosis ,BCL2 ,lymphoma ,small molecule inhibitor ,Veterinary medicine ,SF600-1100 - Abstract
Abstract Background Inhibition of antiapoptotic B‐cell lymphoma 2 (BCL2) proteins by small molecule Bcl‐2 homology 3 (BH3) mimetics causes rapid induction of apoptosis of human hematological cancers in vitro and in vivo. Objectives Assess in vitro sensitivity of non‐neoplastic lymphocytes and primary hematological cancer cells from dogs to venetoclax (VEN) or the dual BCL2/ B‐cell lymphoma‐extra‐large (BCLxL) inhibitor, navitoclax (NAV), and evaluate the association between BCL2 protein expression and VEN sensitivity. Animals Nine client‐owned dogs without cancer and 18 client‐owned dogs with hematological cancer. Methods Prospective, nonrandomized noncontrolled study. Lymphocytes isolated from peripheral blood, lymph node, or bone marrow from dogs were incubated with BH3 mimetics for 24 hours. Viable cells were counted using flow cytometry and half maximal effective concentration (EC50) was calculated. BCL2 protein from whole cell lysates was assessed via immunoblots. Results Nodal B and T lymphocytes were more sensitive to VEN than circulating lymphocytes (P = .02). Neoplastic T lymphocytes were sensitive to VEN (mean EC50 ± SD = 0.023 ± 0.018 μM), whereas most non‐indolent B cell cancers were resistant to killing by VEN (mean EC50 ± SD = 288 ± 700 μM). Unclassified leukemias showed variable sensitivity to VEN (mean EC50 ± SD = 0.49 ± 0.66 μM). Detection of BCL2 protein was not associated with VEN sensitivity. Conclusion and Clinical Importance Neoplastic canine T lymphocytes are sensitive to VEN in vitro. Quantification of BCL2 protein alone is insufficient to predict sensitivity to VEN.
- Published
- 2023
- Full Text
- View/download PDF
3. A retrospective multi‐center study of treatment, outcome, and prognostic factors in 34 dogs with disseminated aspergillosis in Australia
- Author
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Yi Yu Lim, Caroline Mansfield, Mark Stevenson, Mary Thompson, David Davies, Joanna Whitney, Fleur James, Anna Tebb, Darren Fry, Sibylle Buob, Lydia Hambrook, Gladys Boo, and Julien R. S. Dandrieux
- Subjects
canine ,median survival time ,outcome ,prognosis ,Veterinary medicine ,SF600-1100 - Abstract
Abstract Background Disseminated aspergillosis (DA) in dogs has a guarded prognosis and there is a lack of a gold standard treatment protocol. Objective To retrospectively assess survival times and factors influencing survival times. Animals Dogs diagnosed with DA from January 2007 to June 2017. Methods Disseminated aspergillosis case data were retrieved from 13 Australian veterinary referral centers, with a diagnosis confirmed with culture or PCR. Factors influencing survival time after diagnosis were quantified using a Cox proportional hazards regression model. Results Thirty‐four dogs met the study inclusion criteria. Twenty‐two dogs were treated with antifungal treatment and 12 dogs received no antifungal treatment. Accounting for censoring of dogs that were either still alive on the date of data collection or were loss to follow‐up, dogs treated with itraconazole alone (n = 8) had a median survival time (MST) of 63 (95% CI: 20−272) days compared to 830 (95% CI: 267‐1259) days for the n = 14 dogs that received multimodal antifungal therapy (χ2 test statistic 8.6; df = 1; P
- Published
- 2022
- Full Text
- View/download PDF
4. In the Midst of a Pandemic
- Author
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Susan Beltman, Tina Hascher, and Caroline Mansfield
- Subjects
Arts and Humanities (miscellaneous) ,General Psychology - Abstract
The COVID-19 pandemic confronted teachers with unprecedented challenges to their well-being. Drawing on theories of teacher well-being and resilience, this qualitative study explores how teachers experience well-being in their work during the pandemic and the resilience process of activating strategies to maintain their well-being. Participants were 26 teachers from Australian primary and secondary schools. While teachers experienced personal stress or anxiety, they consciously adopted a positive outlook and deliberately engaged in various activities to restore their well-being. Relations with students and colleagues were constraints as well as key enablers of well-being. At the organizational level, flexibility and practical resources provided by schools was an enabler reported by all participants. The study is limited as teachers were from one location, but they reflected a range of schools, roles, and experiences. Findings indicate the proactive approach of teachers and the importance of contextual resources in restoring their well-being during the pandemic.
- Published
- 2022
5. Lean body weight-adjusted intravenous iodinated contrast dose for abdominal CT in dogs reduces interpatient enhancement variability while providing diagnostic quality organ enhancement
- Author
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Jennifer Kan, Marjorie Milne, Dayle Tyrrell, and Caroline Mansfield
- Subjects
Dogs ,General Veterinary ,Body Weight ,Animals ,Contrast Media ,Pilot Projects ,Prospective Studies ,Tomography, X-Ray Computed - Abstract
Contrast-enhanced computed tomography (CECT) is increasingly used to screen for abdominal pathology in dogs, and the contrast dose used is commonly calculated as a linear function of total body weight (TBW). Body fat is not metabolically active and contributes little to dispersing or diluting contrast medium (CM) in the blood. This prospective, analytic, cross-section design pilot study aimed to establish the feasibility of intravenous CM dosed according to lean body weight (LBW) for abdominal CECT in dogs compared to TBW. We hypothesized that when dosing intravenous CM according to LBW, studies will remain at diagnostic quality, there will be a reduced interindividual contrast enhancement (CE) variability, and there will be less change to heart rate and blood pressure in dogs compared to when administering CM calculated on TBW. Twelve dogs had two CECT studies with contrast doses according to TBW and LBW at least 8 weeks apart. Interindividual organ and vessel CE variability, diagnostic quality of the studies, and changes in physiological status were compared between protocols. The LBW-based protocol provided less variability in the CE of most organs and vessels (except the aorta). When dosed according to LBW, liver enhancement was positively associated with grams of iodine per kg TBW during the portal venous phase (P = 0.046). There was no significant difference in physiological parameters after CM administration between dosing protocols. Our conclusion is that a CM dose based on LBW for abdominal CECT lowers interindividual CE variability and is effective at maintaining studies of diagnostic quality.
- Published
- 2022
6. Sensitivity of canine hematological cancers to BH3 mimetics
- Author
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Selvi Jegatheeson, Claire Cannon, Caroline Mansfield, Joanne Devlin, and Andrew Roberts
- Subjects
General Veterinary - Abstract
Inhibition of antiapoptotic B-cell lymphoma 2 (BCL2) proteins by small molecule Bcl-2 homology 3 (BH3) mimetics causes rapid induction of apoptosis of human hematological cancers in vitro and in vivo.Assess in vitro sensitivity of non-neoplastic lymphocytes and primary hematological cancer cells from dogs to venetoclax (VEN) or the dual BCL2/ B-cell lymphoma-extra-large (BCLxL) inhibitor, navitoclax (NAV), and evaluate the association between BCL2 protein expression and VEN sensitivity.Nine client-owned dogs without cancer and 18 client-owned dogs with hematological cancer.Prospective, nonrandomized noncontrolled study. Lymphocytes isolated from peripheral blood, lymph node, or bone marrow from dogs were incubated with BH3 mimetics for 24 hours. Viable cells were counted using flow cytometry and half maximal effective concentration (ECNodal B and T lymphocytes were more sensitive to VEN than circulating lymphocytes (P = .02). Neoplastic T lymphocytes were sensitive to VEN (mean ECNeoplastic canine T lymphocytes are sensitive to VEN in vitro. Quantification of BCL2 protein alone is insufficient to predict sensitivity to VEN.
- Published
- 2022
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