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De Mel S, Goh J, Rashid MBMA, Zhang XY, Jaynes P, Liu X, Poon L, Chan E, Lee J, Chee YL, Koh LP, Tan LK, Soh TG, Yuen YC, Loi H, Ng S, Goh X, Tan D, Cheah DMZ, Pang WL, Huang D, Chan JY, Somasundaram N, Tang T, Lim ST, Ong CK, Chng W, Chow EK, Jeyasekharan AD. CLINICAL APPLICATION OF AN EX‐VIVO PLATFORM TO GUIDE THE CHOICE OF DRUG COMBINATIONS IN RELAPSED/REFRACTORY LYMPHOMA; A PROSPECTIVE STUDY. Hematol Oncol 2021. [DOI: 10.1002/hon.147_2880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- S De Mel
- National University Health System Department of Haematology‐Oncology National University Cancer Institute, Singapore Singapore Singapore
| | - J Goh
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
| | | | - X. Y Zhang
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
| | - P Jaynes
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
| | - X Liu
- National University Health System Department of Haematology‐Oncology National University Cancer Institute, Singapore Singapore Singapore
| | - L Poon
- National University Health System Department of Haematology‐Oncology National University Cancer Institute, Singapore Singapore Singapore
| | - E Chan
- National University Health System Department of Haematology‐Oncology National University Cancer Institute, Singapore Singapore Singapore
| | - J Lee
- National University Health System Department of Haematology‐Oncology National University Cancer Institute, Singapore Singapore Singapore
| | - Y. L Chee
- National University Health System Department of Haematology‐Oncology National University Cancer Institute, Singapore Singapore Singapore
| | - L. P Koh
- National University Health System Department of Haematology‐Oncology National University Cancer Institute, Singapore Singapore Singapore
| | - L. K Tan
- National University Hospital Department of Laboratory Medicine Singapore Singapore
| | - T. G Soh
- National University Hospital Department of Laboratory Medicine Singapore Singapore
| | - Y. C Yuen
- National University Health System Department of Pharmacy Singapore Singapore
| | - Hoi‐Y Loi
- National University Hospital Singapore Department of Diagnostic Imaging Singapore Singapore
| | - Siok‐B Ng
- National University of Singapore Department of Pathology Yong Loo Lin School of Medicine Singapore Singapore
| | - X Goh
- National University Hospital, Department of Otorhinolaryngology Singapore Singapore
| | - D Tan
- Mt Elizabeth Hospital, Dr Daryl Tan Clinic for Lymphoma, Myeloma and Blood Disorders Singapore Singapore
| | - D. M. Z Cheah
- National Cancer Centre Singapore Lymphoma Genomic Translational Research Laboratory Division of Cellular and Molecular Research Singapore Singapore
| | - W. L Pang
- National Cancer Centre Singapore Lymphoma Genomic Translational Research Laboratory Division of Cellular and Molecular Research Singapore Singapore
| | - D Huang
- National Cancer Centre Singapore Lymphoma Genomic Translational Research Laboratory Division of Cellular and Molecular Research Singapore Singapore
| | - J. Y Chan
- National Cancer Centre Singapore Division of Medical Oncology Singapore Singapore
| | - N Somasundaram
- National Cancer Centre Singapore Division of Medical Oncology Singapore Singapore
| | - T Tang
- National Cancer Centre Singapore Division of Medical Oncology Singapore Singapore
| | - S. T Lim
- National Cancer Centre Singapore Division of Medical Oncology Singapore Singapore
| | - C. K Ong
- National Cancer Centre Singapore Division of Cellular and Molecular Research Singapore Singapore
| | - W.‐J Chng
- National University Health System Department of Haematology‐Oncology National University Cancer Institute, Singapore Singapore Singapore
| | - E. K Chow
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
| | - A. D Jeyasekharan
- National University Health System Department of Haematology‐Oncology National University Cancer Institute, Singapore Singapore Singapore
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Hoppe MM, Fan S, Jaynes P, Peng Y, Liu X, De Mel S, Poon L, Chan E, Lee J, Chee YL, Ong CK, Tang T, Lim ST, Chng WJ, Grigoropoulos NF, VanSchoiack A, Bertolazzi G, Ng S, Tripodo C, Jeyasekharan AD. DIGITAL SPATIAL PROFILING OF DIFFUSE LARGE B‐CELL LYMPHOMAS REVEALS STING AS AN IMMUNE‐RELATED DETERMINANT OF SURVIVAL AFTER R‐CHOP THERAPY. Hematol Oncol 2021. [DOI: 10.1002/hon.8_2880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- M. M Hoppe
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
| | - S Fan
- National University of Singapore Department of Pathology Yong Loo Lin School of Medicine Singapore Singapore
| | - P Jaynes
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
| | - Y Peng
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
| | - X Liu
- National University Health System Department of Haematology‐Oncology Singapore Singapore
| | - S De Mel
- National University Health System Department of Haematology‐Oncology Singapore Singapore
| | - L Poon
- National University Health System Department of Haematology‐Oncology Singapore Singapore
| | - E Chan
- National University Health System Department of Haematology‐Oncology Singapore Singapore
| | - J Lee
- National University Health System Department of Haematology‐Oncology Singapore Singapore
| | - Y. L Chee
- National University Health System Department of Haematology‐Oncology Singapore Singapore
| | - C. K Ong
- National Cancer Centre Singapore Division of Cellular and Molecular Research Singapore Singapore
| | - T Tang
- National Cancer Centre Singapore Division of Medical Oncology Singapore Singapore
| | - S. T Lim
- National Cancer Centre Singapore Division of Medical Oncology Singapore Singapore
| | - W. J Chng
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
| | - N. F Grigoropoulos
- Singapore General Hospital Department of Haematology Singapore Singapore
| | | | - G Bertolazzi
- University of Palermo Tumor Immunology Unit Palermo Italy
| | - Siok‐B Ng
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
| | - C Tripodo
- University of Palermo Tumor Immunology Unit Palermo Italy
| | - A. D Jeyasekharan
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
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Hoppe MM, Jaynes P, Fan S, Peng Y, Hoang PM, Liu X, De Mel S, Poon L, Chan E, Lee J, Chee YL, Ong CK, Tang T, Lim ST, Grigoropoulos NF, Tan S, Hue SS, Chang S, Chuang S, Li S, Khoury JD, Choi H, Farinha P, Mottok A, Scott DW, Chng W, Ng S, Tripodo C, Jeyasekharan AD. MYC, BCL2 AND BCL6 COEXPRESSION PATTERNS AT SINGLE‐CELL RESOLUTION RE‐DEFINE DOUBLE EXPRESSOR LYMPHOMAS. Hematol Oncol 2021. [DOI: 10.1002/hon.9_2880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- M. M Hoppe
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
| | - P Jaynes
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
| | - S Fan
- National University of Singapore Department of Pathology Yong Loo Lin School of Medicine Singapore Singapore
| | - Y Peng
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
| | - P. M Hoang
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
| | - X Liu
- National University Health System Department of Haematology‐Oncology Singapore Singapore
| | - S De Mel
- National University Health System Department of Haematology‐Oncology Singapore Singapore
| | - L Poon
- National University Health System Department of Haematology‐Oncology Singapore Singapore
| | - E Chan
- National University Health System Department of Haematology‐Oncology Singapore Singapore
| | - J Lee
- National University Health System Department of Haematology‐Oncology Singapore Singapore
| | - Y. L Chee
- National University Health System Department of Haematology‐Oncology Singapore Singapore
| | - C. K Ong
- National Cancer Centre Singapore Division of Cellular and Molecular Research Singapore Singapore
| | - T Tang
- National Cancer Centre Singapore Division of Medical Oncology Singapore Singapore
| | - S. T Lim
- National Cancer Centre Singapore Division of Medical Oncology Singapore Singapore
| | - N. F Grigoropoulos
- Singapore General Hospital Department of Haematology Singapore Singapore
| | - S.‐Y Tan
- National University of Singapore Department of Pathology Yong Loo Lin School of Medicine Singapore Singapore
| | - S. S.‐S Hue
- National University of Singapore Department of Pathology Yong Loo Lin School of Medicine Singapore Singapore
| | - S.‐T Chang
- Chi‐Mei Medical Center Department of Pathology Tainan Taiwan
| | - S.‐S Chuang
- Chi‐Mei Medical Center Department of Pathology Tainan Taiwan
| | - S Li
- The University of Texas MD Anderson Cancer Center Department of Hematopathology, Division of Pathology and Laboratory Medicine Houston USA
| | - J. D Khoury
- The University of Texas MD Anderson Cancer Center Department of Hematopathology, Division of Pathology and Laboratory Medicine Houston USA
| | - H Choi
- National University of Singapore Department of Medicine, Yong Loo Lin School of Medicine Singapore Singapore
| | - P Farinha
- BC Cancer Research Centre Department of Lymphoid Cancer Research Vancouver Canada
| | - A Mottok
- University Medical Center and University of Ulm, Institute of Human Genetics Ulm Germany
| | - D. W Scott
- BC Cancer Research Centre Department of Lymphoid Cancer Research Vancouver Canada
| | - Wee‐J Chng
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
| | - S.‐B Ng
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
| | - C Tripodo
- University of Palermo Tumor Immunology Unit Palermo Italy
| | - A. D Jeyasekharan
- National University of Singapore Cancer Science Institute of Singapore Singapore Singapore
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Qin J, Zhang S, Poon L, Pan Z, Luo J, Yu N, Wang L, Wu X, Cheng X, Xie X, Lu Y, LU W. Doppler-based predictive model for methotrexate resistance in low-risk gestational trophoblastic neoplasia with myometrial invasion: prospective study of 147 patients. Ultrasound Obstet Gynecol 2021; 57:829-839. [PMID: 32385928 PMCID: PMC8251727 DOI: 10.1002/uog.22069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 03/30/2020] [Accepted: 04/22/2020] [Indexed: 06/11/2023]
Abstract
OBJECTIVES This prospective clinical study aimed to evaluate the vascularization characteristics of low-risk gestational trophoblastic neoplasia (GTN) using Doppler imaging and to develop a predictive model for resistance to methotrexate (MTX). METHODS Patients with low-risk GTN receiving primary MTX treatment were enrolled from the Women's Hospital, Zhejiang University School of Medicine, Hangzhou, China, from September 2012 to August 2018. The primary endpoint was to develop and internally validate a predictive model for resistance to MTX therapy in these patients. In the training set, clinical features and Doppler hemodynamic parameters before MTX therapy were analyzed using logistic regression to identify independent predictors of MTX resistance, which were integrated into the model. The predictive performance of the model was evaluated by leave-one-out cross-validation in the training dataset and internal validation in an independent-sample test dataset. RESULTS The entire imaging protocol was completed by 147 eligible patients, of which 110 comprised the training set and 37 the test set. In the training set, cases with myometrial invasion (81.8%; 90/110) showed vascular-enriched areas in the myometrium and high velocity and low impedance ratios of the uterine artery (UtA) compared to cases without myometrial invasion (18.2%; 20/110). On multivariate logistic regression analysis, time-averaged mean velocity in UtA (UtA-TAmean) and the International Federation of Gynecology and Obstetrics (FIGO) score were identified as independent predictors (P = 0.009 and P = 0.043, respectively) of MTX resistance. The Doppler-based predictive model, developed based on the 90 cases with myometrial invasion, was y = -2.95332 + 0.41696 × FIGO score + 0.03551 × UtA-TAmean. The model showed an area under the curve of 0.757 (95% CI, 0.653-0.862) and the optimal cut-off value was 0.50622, which had 45.2% sensitivity and 96.6% specificity. The model stratified patients with low-risk GTN into low (< 10%), intermediate (10-90%) and high (> 90%) probability of MTX resistance, based on the threshold values of -1.59544 and 0.10046. The model had an accuracy of 74.4% (95% CI, 64.5-82.3%) in the cross-validation and 72.7% (95% CI, 55.8-84.9%) in the internal validation. CONCLUSIONS The Doppler-based predictive model, combining a non-invasive marker of tumor vascularity with the FIGO scoring system, can differentiate cases with low from those with high probability of developing MTX resistance and therefore has the potential to guide treatment options in patients with low-risk GTN and myometrial invasion. © 2020 Authors. Ultrasound in Obstetrics & Gynecology published by John Wiley & Sons Ltd on behalf of International Society of Ultrasound in Obstetrics and Gynecology.
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Affiliation(s)
- J. Qin
- Women's Reproductive Health Key Laboratory of Zhejiang Province, Women's HospitalZhejiang University School of MedicineHangzhouZhejiangChina
- Center for Uterine Cancer Diagnosis & Therapy Research of Zhejiang ProvinceHangzhouZhejiangChina
| | - S. Zhang
- Women's Reproductive Health Key Laboratory of Zhejiang Province, Women's HospitalZhejiang University School of MedicineHangzhouZhejiangChina
- Center for Uterine Cancer Diagnosis & Therapy Research of Zhejiang ProvinceHangzhouZhejiangChina
| | - L. Poon
- Department of Obstetrics and GynaecologyThe Chinese University of Hong KongHong Kong SAR
| | - Z. Pan
- Women's Reproductive Health Key Laboratory of Zhejiang Province, Women's HospitalZhejiang University School of MedicineHangzhouZhejiangChina
- Center for Uterine Cancer Diagnosis & Therapy Research of Zhejiang ProvinceHangzhouZhejiangChina
| | - J. Luo
- Women's Reproductive Health Key Laboratory of Zhejiang Province, Women's HospitalZhejiang University School of MedicineHangzhouZhejiangChina
| | - N. Yu
- Women's Reproductive Health Key Laboratory of Zhejiang Province, Women's HospitalZhejiang University School of MedicineHangzhouZhejiangChina
| | - L. Wang
- Women's Reproductive Health Key Laboratory of Zhejiang Province, Women's HospitalZhejiang University School of MedicineHangzhouZhejiangChina
| | - X. Wu
- Women's Reproductive Health Key Laboratory of Zhejiang Province, Women's HospitalZhejiang University School of MedicineHangzhouZhejiangChina
| | - X. Cheng
- Women's Reproductive Health Key Laboratory of Zhejiang Province, Women's HospitalZhejiang University School of MedicineHangzhouZhejiangChina
- Center for Uterine Cancer Diagnosis & Therapy Research of Zhejiang ProvinceHangzhouZhejiangChina
| | - X. Xie
- Women's Reproductive Health Key Laboratory of Zhejiang Province, Women's HospitalZhejiang University School of MedicineHangzhouZhejiangChina
- Center for Uterine Cancer Diagnosis & Therapy Research of Zhejiang ProvinceHangzhouZhejiangChina
| | - Y. Lu
- Women's Reproductive Health Key Laboratory of Zhejiang Province, Women's HospitalZhejiang University School of MedicineHangzhouZhejiangChina
- Center for Uterine Cancer Diagnosis & Therapy Research of Zhejiang ProvinceHangzhouZhejiangChina
- Institute of Translational MedicineZhejiang University School of MedicineHangzhouChina
| | - W. LU
- Women's Reproductive Health Key Laboratory of Zhejiang Province, Women's HospitalZhejiang University School of MedicineHangzhouZhejiangChina
- Center for Uterine Cancer Diagnosis & Therapy Research of Zhejiang ProvinceHangzhouZhejiangChina
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Ng S, Liu T, Chan C, Chan C, Chu C, Poon C, Poon L, Lai C, Tse M. Reliability and validity of the long-distance corridor walk among stroke survivors. J Rehabil Med 2020; 52:jrm00062. [DOI: 10.2340/16501977-2691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Martin P, Poon L. COMORBIDITY, COGNITION AND PSYCHOLOGICAL WELL-BEING AMONG THE OLDEST OLD. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.2772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- P Martin
- Iowa State University, Ames, Iowa
| | - L Poon
- University of Georgia, Athens, Georgia
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Poon L, Martin P, Kheibek RE, Willcox B. IMPACT AND MEASUREMENT ISSUES OF COMORBIDITY AMONG THE OLDEST OLD. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.2774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- L Poon
- University of Georgia, Athens, Georgia, United States
| | - P Martin
- Iowa State University, Ames, IA, USA
| | - R E Kheibek
- Washington DC VA Medical Center, Washington, DC, USA
| | - B Willcox
- Kuakini Medical Center, Honolulu, HI, USA
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Harrison Joynt M, Martin P, Poon L. GENDER DIFFERENCES AND SIMILARITIES AMONG OLDEST OLD ADULTS: A STUDY OF PERSONALITY, SOCIAL SUPPORT AND DISABLEMENT. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.1052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Campbell R, Woodard J, Miller L, Davey A, Martin P, Poon L. SENSORY IMPAIRMENT IS RELATED TO BETTER MEMORY PERFORMANCE IN THE FULD OBJECT MEMORY EVALUATION. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Poon L. Re: Prediction of early- and late-onset pregnancy-induced hypertension using placental volume on three-dimensional ultrasound and uterine artery Doppler. T. Arakaki, J. Hasegawa, M. Nakamura, S. Hamada, M. Muramoto, H. Takita, K. Ichizuka and A. Sekizawa. Ultrasound Obstet Gynecol 2015; 45: 539-543. Ultrasound Obstet Gynecol 2015; 45:513. [PMID: 25914394 DOI: 10.1002/uog.14857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Affiliation(s)
- L Poon
- Harris Birthright Research Centre for Fetal Medicine, Division of Women's Health, King's College London, London, UK.
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Suzuki A, Kumari V, Poon L, Cleare A. EPA-0453 – Processing bias of facial emotions as a function of childhood trauma: resilience and vulnerability to depression. Eur Psychiatry 2014. [DOI: 10.1016/s0924-9338(14)77871-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Derwig I, Lythgoe DJ, Barker GJ, Poon L, Gowland P, Yeung R, Zelaya F, Nicolaides K. Association of placental perfusion, as assessed by magnetic resonance imaging and uterine artery Doppler ultrasound, and its relationship to pregnancy outcome. Placenta 2013; 34:885-91. [PMID: 23937958 DOI: 10.1016/j.placenta.2013.07.006] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Revised: 07/08/2013] [Accepted: 07/11/2013] [Indexed: 01/16/2023]
Affiliation(s)
- I Derwig
- Harris Birthright Research Centre, Kings College Hospital, London, UK.
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Derwig I, Barker G, Poon L, Zelaya F, Gowland P, Lythgoe D, Nicolaides K. Association of placental T2 relaxation times and uterine artery Doppler ultrasound measures of placental blood flow. Placenta 2013; 34:474-9. [DOI: 10.1016/j.placenta.2013.03.005] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2012] [Revised: 03/15/2013] [Accepted: 03/18/2013] [Indexed: 10/26/2022]
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Carvalho LA, Torre JP, Papadopoulos AS, Poon L, Juruena MF, Markopoulou K, Cleare AJ, Pariante CM. Lack of clinical therapeutic benefit of antidepressants is associated overall activation of the inflammatory system. J Affect Disord 2013. [PMID: 23200297 DOI: 10.1016/j.jad.2012.10.036] [Citation(s) in RCA: 124] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Despite the evidence of an association between depression and increased inflammatory markers, still little is known in relation to the most severe cases of the disorder i.e., those who fail to respond to antidepressants. We have assessed the cytokine profile and cortisol levels in 21 healthy controls (HC) and 19 medicated patients with depression with treatment-resistance (TRD) moderately ill. As an initial exploratory analysis, we have also related cytokine profile to the patient's clinical treatment outcome after an inpatient admission. Cytokine profile was measured in the serum by the Cytokine Array I kit (Randox). Plasma cortisol was carried out using a commercially available for the IMMULITE system. When compared to healthy controls, depressed patients had higher levels of cortisol, IL-6, IL-10, but lower levels of IL-4 and VEGF. Our exploratory analysis showed subjects who did not go on to respond to the inpatient admission treatment package had lower levels of MCP-1, and a trend toward lower levels of VEGF. Taking together, these data suggest that lack of clinical therapeutic benefit of antidepressants is associated with overall activation of the inflammatory system.
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Affiliation(s)
- L A Carvalho
- Section of Perinatal Psychiatry & Stress, Psychiatry and Immunology Laboratory King's College London, Institute of Psychiatry, London, UK.
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Rane LJ, Fekadu A, Papadopoulos AS, Wooderson SC, Poon L, Markopoulou K, Cleare AJ. Psychological and physiological effects of caring for patients with treatment-resistant depression. Psychol Med 2012; 42:1825-1833. [PMID: 22251699 DOI: 10.1017/s0033291711003035] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Carers of patients with psychiatric disorders show high levels of anxiety and depression, possibly mediated through disruption of the hypothalamo-pituitary-adrenal (HPA) axis. Among carers of patients with treatment-resistant depression (TRD), we set out to determine the psychological and physiological (HPA axis) consequences of caring, and the association of these consequences with long-term outcome in patients. METHOD Thirty-five informal carers of patients with severe TRD requiring in-patient treatment were recruited and compared with 23 controls. HPA-axis activity was assessed by measuring post-awaking salivary cortisol. The Involvement Evaluation Questionnaire (IEQ) and the General Health Questionnaire-12 (GHQ-12) were administered to measure carer burden and psychiatric caseness respectively. Independent t tests were used to compare differences between carers and controls and a linear regression model was used to determine the association of post-awakening cortisol with carer status while controlling for confounding variables. Data on long-term patient outcome (12 to 83 months), measured using the Hamilton Depression Rating Scale (HAMD), were also obtained and linear regression was used to determine the association between cortisol output in carers and remission status in patients. RESULTS Carers experienced high carer burden and high psychiatric caseness. Carers showed reduced cortisol output after awakening, calculated as the area under the curve with respect to ground (AUCg), which remained significant after controlling for potential confounders. In a linear regression model, non-remission in patients was associated with reduced cortisol output in carers. CONCLUSIONS Caring for patients with TRD is associated with adverse psychological and physiological changes suggesting hypocortisolism post-awakening. These changes are associated with poor patient outcome.
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Affiliation(s)
- L J Rane
- Section of Neurobiology of Mood Disorders, Division of Psychological Medicine and Psychiatry, Institute of Psychiatry, London, UK.
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Poon L, Zandberg W, Hsiao D, Erno Z, Sen D, Gates BD, Branda NR. Photothermal release of single-stranded DNA from the surface of gold nanoparticles through controlled denaturating and Au-S bond breaking. ACS Nano 2010; 4:6395-6403. [PMID: 20958080 DOI: 10.1021/nn1016346] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Photothermal release of DNA from gold nanoparticles either by thermolysis of the Au-S bonds used to anchor the oligonucleotides to the nanoparticle or by thermal denaturation has great therapeutic potential, however, both processes have limitations (a decreased particle stability for the former process and a prohibitively slow rate of release for the latter). Here we show that these two mechanisms are not mutually exclusive and can be controlled by adjusting laser power and ionic strength. We show this using two different double-stranded (ds)DNA-nanoparticle conjugates, in which either the anchored sense strand or the complementary antisense strand was labeled with a fluorescent marker. The amounts of release due to the two mechanisms were evaluated using fluorescence spectroscopy and capillary electrophoresis, which showed that irradiation of the decorated particles in 200 mM NaOAc containing 10 mM Mg(OAc)(2) with a pulsed 532 nm laser operating at 100 mW favors denaturation over Au-S cleavage to an extent of more than six-to-one. Due to the use of a pulsed laser, the process occurs on the order of minutes rather than hours, which is typical for continuous wave lasers. These findings encourage continued research toward developing photothermal gene therapeutics.
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Affiliation(s)
- Lester Poon
- 4D LABS, Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada, V5A 1S6
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Rane LJ, Fekadu A, Wooderson S, Poon L, Markopoulou K, Cleare AJ. Discrepancy between subjective and objective severity in treatment-resistant depression: prediction of treatment outcome. J Psychiatr Res 2010; 44:1082-7. [PMID: 20471031 DOI: 10.1016/j.jpsychires.2010.03.020] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2009] [Revised: 03/21/2010] [Accepted: 03/25/2010] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Identifying predictors of outcome among patients with treatment-resistant depression (TRD) is challenging. We hypothesised that discrepancy between self-rated and observer-rated scales may be a simple way of making such a prediction. METHOD 102 patients were admitted to a unit specialising in the treatment of resistant depression and underwent fortnightly assessment with clinician-rated (Hamilton Depression Rating Scale-21, HAM-D) and self-rated (Beck Depression Inventory, BDI) measures. All patients had significant depressive symptoms that were treatment resistant, 70% as part of a major depressive disorder and the remainder as part of a bipolar or other disorder. A discrepancy score between the HAM-D and BDI was calculated on admission and its association with patient clinico-demographic factors was determined. A subset of 67 patients remained as inpatients for 40 weeks or until clinical response and were entered into a responder analysis, in which response was defined as ≥50% reduction in admission HAM-D score. The association of the admission BDI-HAM-D discrepancy score with subsequent patient response, was determined. RESULTS The magnitude of BDI-HAM-D discrepancy was higher in those with co-morbid personality disorder, lower in those with psychosis and positively correlated with anxiety. High BDI-HAM-D discrepancy score predicted delayed treatment response (odds ratio 5.40, p = 0.005). CONCLUSION Within TRD, higher discrepancy predicts slower response to treatment independent of objective illness severity; this may be mediated by underlying personality traits and co-morbid anxiety.
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Affiliation(s)
- L J Rane
- King's College London, Institute of Psychiatry, Division of Psychological Medicine and Psychiatry, Section of Neurobiology of Mood Disorders, 103 Denmark Hill, London SE5 8AZ, UK.
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Li O, Poon L. Influenza Polymerase Subunits Compatibility Between Human H1 and H5 Viruses. Int J Infect Dis 2008. [DOI: 10.1016/j.ijid.2008.05.782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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Rao A, Celik E, Poggi S, Poon L, Nicolaides KH. Cervical length and maternal factors in expectantly managed prolonged pregnancy: prediction of onset of labor and mode of delivery. Ultrasound Obstet Gynecol 2008; 32:646-651. [PMID: 18816476 DOI: 10.1002/uog.6211] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
OBJECTIVE To examine the value of combining cervical length and maternal characteristics in a prolonged-pregnancy clinic in the prediction of the probability of firstly, spontaneous onset of labor within the subsequent 10 days and secondly, the need for Cesarean section. METHODS This was a prospective study of women with singleton pregnancies attending an ultrasound-based prolonged-pregnancy clinic at 40 + 4 to 41 + 6 weeks of gestation. The policy was to delay induction of labor by 7-10 days unless there was evidence of a specific medical or obstetric indication or the mother wanted earlier delivery. The measurement of cervical length was not given to the obstetrician, midwife or patient. Regression analysis was used to determine which of the following factors had a significant contribution in predicting induction of labor: maternal age, body mass index (BMI), ethnic origin, parity and cervical length. Regression analysis was also used to determine which of the factors amongst the maternal characteristics, onset of labor and cervical length provided significant prediction of Cesarean section. RESULTS We examined 2316 pregnancies but we excluded from further analysis 452 (19.5%) cases because iatrogenic delivery was carried out within the subsequent 6 days, including 427 cases of induction of labor (340 at the request of the mother and 87 for medical indications) and 25 cases of Cesarean section. In the remaining 1864 cases there was spontaneous onset of labor and delivery within 10 days in 1536 (82.4%) and induction of labor in 7-10 days in 328 (17.6%). The rate of Cesarean section was 15.2% (233 of 1536) in those with spontaneous onset of labor and 36.0% (118 of 328) in those whose labor was induced. Regression analysis demonstrated that in the prediction of induction of labor there were significant contributions from cervical length, BMI, parity and gestational age, and in the prediction of Cesarean section there were significant contributions from onset of labor, cervical length, BMI, parity and ethnicity. CONCLUSION Ultrasonographic measurement of cervical length at 41 weeks together with maternal factors can define the patient-specific probability of spontaneous onset of labor in the subsequent week and the risk of Cesarean section.
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Affiliation(s)
- A Rao
- Harris Birthright Research Centre for Fetal Medicine, King's College Hospital, London, UK
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Plasencia W, Maiz N, Poon L, Yu C, Nicolaides KH. Uterine artery Doppler at 11 + 0 to 13 + 6 weeks and 21 + 0 to 24 + 6 weeks in the prediction of pre-eclampsia. Ultrasound Obstet Gynecol 2008; 32:138-146. [PMID: 18634131 DOI: 10.1002/uog.5402] [Citation(s) in RCA: 117] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
OBJECTIVE To evaluate the performance of screening for pre-eclampsia by uterine artery pulsatility index (PI) at 11 + 0 to 13 + 6 weeks' gestation and the change in uterine artery PI between 11 + 0 to 13 + 6 and 21 + 0 to 24 + 6 weeks. METHODS In 3107 singleton pregnancies attending for routine care at 11 + 0 to 13 + 6 and 21 + 0 to 24 + 6 weeks' gestation we recorded maternal characteristics and medical and obstetric history, and measured uterine artery PI. The distributions of uterine artery PI were made Gaussian after logarithmic transformation and the log of the ratio of uterine artery PI at 21 + 0 to 24 + 6 weeks to that at 11 + 0 to 13 + 6 weeks was calculated. Multiple regression analysis was used to determine which of the maternal variables and Doppler findings were significant predictors of early and late pre-eclampsia. The performance of screening was described by receiver-operating characteristics curves. RESULTS Pre-eclampsia developed in 93 (3.0%) pregnancies, including 22 (0.7%) in which delivery was before 34 weeks (early pre-eclampsia) and 71 (2.3%) with delivery at 34 weeks or more (late pre-eclampsia). Seventy-three (2.3%) women developed gestational hypertension, 346 (11.1%) delivered small-for-gestational-age (SGA) babies with no hypertensive disorders and 2595 (83.5%) were unaffected by pre-eclampsia, gestational hypertension or SGA. Multiple regression analysis demonstrated that maternal variables, uterine artery PI at 11 + 0 to 13 + 6 weeks and the change in uterine artery PI between 11 + 0 to 13 + 6 and 21 + 0 to 24 + 6 weeks' gestation provided significant independent contributions to the prediction of pre-eclampsia. For a false positive rate of 5% the predicted detection rates of early and late pre-eclampsia were 90.9 and 31.0%, respectively. The same performance of screening was achieved by reserving second-trimester testing for only the 20% of women at the highest risk after first-trimester screening. CONCLUSION The decrease in uterine artery PI between 11 + 0 to 13 + 6 and 21 + 0 to 24 + 6 weeks is steeper in pregnancies with a normal outcome than in those developing pre-eclampsia. Effective screening for pre-eclampsia can be achieved by the Doppler measurement of uterine artery PI at 11 + 0 to 13 + 6 weeks and the change in PI between 11 + 0 to 13 + 6 and 21 + 0 to 24 + 6 weeks.
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Affiliation(s)
- W Plasencia
- Harris Birthright Research Centre for Fetal Medicine, King's College Hospital, London, UK
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Abstract
The purpose of this study was to determine how health impairment, socioeconomic status, and social support relate to life satisfaction in later life. Using data from a sample of 320 older adults from The Georgia Centenarian Study, we constructed a structural model of life satisfaction. LISREL analysis was performed to test a two-factor model that included Happiness and Congruence and to determine the relationship of health impairment, socioeconomic status (SES), and social support to Happiness and Congruence, two measures of the Life Satisfaction Index-A (LSI-A). Data were found to provide a satisfactory fit of the model (GFI = 0.94; AFGI = 0.91). Social support and SES were found to have direct effects on health impairment. Health impairment was a key predictor and mediating variable of Happiness and Congruence. Findings also support a relationship between social resources and subjective well-being in later life. In particular, the association between social resources and life satisfaction was mediated through health impairment. These findings offer understanding relative to how health and social resources influence past and present assessments of subjective well-being among the elderly.
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Abstract
H5N1 avian influenza has spread to eight countries in eastern Asia including China, Japan, South Korea, Vietnam, Laos, Cambodia, Thailand, and Indonesia in early 2004. This H5N1 influenza A virus is extremely virulent in poultry including chickens and ducks, killing millions of birds throughout the region. Additionally this virus has transmitted to humans (mainly children) in Vietnam, Cambodia, and Thailand, killing 54 of 100 diagnosed persons. To control this epidemic hundreds of millions of chickens and ducks have been culled. One genotype of H5N1 designated "Z" has become dominant in Asia. This virus was first detected in wild birds in Hong Kong in November 2002 and was antigenically distinct from H5N1 viruses isolated from 1997 to early 2002 and lethal for aquatic birds. The H5N1 virus infecting humans and poultry in Asia in 2004 is an antigenic variant of the Z genotype. Here we consider the possible role of migrating birds in the evolution and spread of the H5N1 influenza A virus throughout Asia. We conclude that the available information is consistent with a role for migrating birds but limited information is available and that serological studies are urgently needed on migrating birds worldwide. The prospect is that this H5N1/04 influenza A virus will become endemic in poultry in eastern Asia and will be a continuing threat to animal and human health. It is also projected that a human H5N1 vaccine will eventually be needed.
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Affiliation(s)
- R G Webster
- Division of Virology, Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.
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Abstract
H9N2 influenza viruses are panzootic in domestic poultry in Eurasia and since 1999 have caused transient infections in humans and pigs. To investigate the zoonotic potential of H9N2 viruses, we studied the evolution of the viruses in live-poultry markets in Hong Kong in 2003. H9N2 was the most prevalent influenza virus subtype in the live-poultry markets between 2001 and 2003. Antigenic and phylogenetic analysis of hemagglutinin (HA) showed that all of the 19 isolates found except one belonged to the lineage represented by A/Duck/Hong Kong/Y280/97 (H9N2). The exception was A/Guinea fowl/NT184/03 (H9N2), whose HA is most closely related to that of the human isolate A/Guangzhou/333/99 (H9N2), a virus belonging to the A/Chicken/Beijing/1/94-like (H9N2) lineage. At least six different genotypes were recognized. The majority of the viruses had nonstructural (and HA) genes derived from the A/Duck/Hong Kong/Y280/97-like virus lineage but had other genes of mixed avian virus origin, including genes similar to those of H5N1 viruses isolated in 2001. Viruses of all six genotypes of H9N2 found were able to replicate in chickens and mice without adaptation. The infected chickens showed no signs of disease, but representatives of two viral genotypes were lethal to mice. Three genotypes of virus replicated in the respiratory tracts of swine, which shed virus for at least 5 days. These results show an increasing genetic and biologic diversity of H9N2 viruses in Hong Kong and support their potential role as pandemic influenza agents.
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Affiliation(s)
- Y K Choi
- Division of Virology, Department of Infectious Diseases, Mail Stop 330, St. Jude Children's Research Hospital, 332 N. Lauderdale, Memphis, TN 38105-2694, USA
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Reisberg B, Finkel S, Overall J, Schmidt-Gollas N, Kanowski S, Lehfeld H, Hulla F, Sclan SG, Wilms HU, Heininger K, Hindmarch I, Stemmler M, Poon L, Kluger A, Cooler C, Bergener M, Hugonot-Diener L, Robert PH, Antipolis S, Erzigkeit H. The Alzheimer's disease activities of daily living international scale (ADL-IS). Int Psychogeriatr 2001; 13:163-81. [PMID: 11495392 DOI: 10.1017/s1041610201007566] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND Activities of daily living (ADL) deficits are integral components of dementia disorders, and ADL measures are among the most robust markers of the course of Alzheimer's disease (AD). Despite this acknowledged importance, no clearly useful ADL instrument for cross-cultural application in pharmacologic trials in the early stages of AD had been available. METHOD An international effort was launched to develop an ADL scale for pharmacologic trials in early AD. Steps taken from 1990 to the present included: (1) international scientific working group meetings and reviews, (2) reviews of existing measures, (3) collating of existent, nonredundant items, (4) querying experts for new items, (5) interviews with informants and subjects in the USA, France, and Germany, toward the identification of potential new items, (6) identification of an item pool based upon these procedures, (7) creation of a trial instrument, (8) piloting of this instrument, and (9) refinement of the scale based upon statistical analysis of the pilot data. Final item selection was based upon: (1) relevance for > or = 80% of subjects in severity-stratified USA and German samples; (2) absence of gender and national biases; (3) significant (p <.05) discrimination between (a) normal versus mildly impaired and (b) mildly impaired versus moderately to moderately severely impaired subjects; and (4) Global Deterioration Scale (GDS) scores accounting for > or = 12% of variance in the item after controlling for age and gender. RESULTS An ADL scale consisting of 40 items that correlate with the global and cognitive progress of AD is developed for international usage in pharmacologic trials in incipient, mild, moderate, and moderately severe AD. The scale contains 40 items falling within 13 ADL categories. The 40-item scale is shown to have .81 correlation with GDS staging, .81 with mental status assessment (Mini-Mental State Examination), and .81 with a psychometric test (the SKT) (p values < .001). CONCLUSION This scale can be used to measure therapeutic response in AD.
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Affiliation(s)
- B Reisberg
- Aging and Dementia Research Center, New York University School of Medicine, New York 10016, USA.
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Abstract
Salivary cortisol profiles (hourly sampling over a 16-hour period) of 10 patients with chronic fatigue syndrome (CFS) but without concurrent depressive disorder were compared with those of 10 healthy volunteers matched for age, sex and menstrual cycle. The mean saliva cortisol concentration over the 16-hour period was slightly but significantly greater in the patients than the controls (p < 0.05). These findings are at variance with earlier reports that CFS is a hypocortisolaemic state and suggest that in CFS the symptom of fatigue is not caused by hypocortisolaemia.
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Affiliation(s)
- B Wood
- Institute of Psychiatry, London, UK
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Abstract
OBJECTIVE This study was conducted to determine whether an increase in salivary free cortisol would be reliably elicited by a midday meal, thus providing a convenient physiological challenge to the hypothalamic-pituitary-adrenal (HPA) axis, and whether this cortisol release depended on the protein content of the meal. METHOD In healthy men, free cortisol was measured in saliva samples taken before and after two identical protein-rich midday meals (39% energy as protein) and compared with a day on which no meal was eaten. Next, in healthy women in a nonclinical setting, salivary cortisol was measured before and after a protein-rich meal (32% energy as protein) on one day and a low-protein meal (5% energy as protein) on another day. Measures of mood, appetite, and psychological well-being were also taken. RESULTS An acute meal-dependent increase in salivary cortisol occurred, which was reliable over 2 test days. This increase in cortisol depended on the proportion of protein in the meal, increasing after the high-protein but not the low-protein meal. The extent of this increase in cortisol correlated significantly with poor psychological well-being in women. Some postmeal improvement of mood (positive affect) was associated with the high- but not the low-protein meal. CONCLUSIONS The cortisol response to meals may have implications for the effects of meal composition on mood, cognitive function, and food choice. The measurement of free cortisol in saliva provides a psychologically stress-free and reliable technique to assess the cortisol response to a standard protein-rich meal, ie, a physiological challenge to the HPA axis in men and women that could be investigated in naturalistic settings outside the laboratory.
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Affiliation(s)
- E L Gibson
- Department of Epidemiology and Public Health, University College, London, United Kingdom.
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Kumari V, Mulligan OF, Cotter PA, Poon L, Toone BK, Checkley SA, Gray JA. Effects of single oral administrations of haloperidol and d-amphetamine on prepulse inhibition of the acoustic startle reflex in healthy male volunteers. Behav Pharmacol 1998; 9:567-76. [PMID: 9862082 DOI: 10.1097/00008877-199811000-00012] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The effects of acute administration of an indirect dopamine-agonist, d-amphetamine, and a non-selective dopamine receptor antagonist, haloperidol, were investigated in normal male volunteers on habituation and prepulse inhibition (PPI) of the acoustic startle reflex in two experiments. In Experiment 1, 40 male non-smoker volunteers were tested for habituation and PPI (defined as percentage reduction of the pulse-alone amplitude; prepulses 9 dB above background) before and after double-blind administration of either 2 mg haloperidol or placebo. No influence of haloperidol was observed on either habituation or PPI of the startle reflex in this experiment. In Experiment 2, 60 male volunteers underwent startle testing before and after double-blind administration of a single oral dose of 5 mg haloperidol, 5 mg d-amphetamine or placebo. Habituation and PPI (prepulses 15 dB above background) for the placebo group did not differ significantly from that observed for the d-amphetamine or for the haloperidol group. However, in a subgroup of smoking subjects, both d-amphetamine and haloperidol reduced PPI as compared to that observed prior to drug administration. The implications of these findings in relation to animal pharmacological studies and observed sensorimotor gating deficits in schizophrenia are discussed.
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Affiliation(s)
- V Kumari
- Section of Cognitive Psychopharmacology, University of London, UK.
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Abstract
Research investigating how the recall of one's past functions in maintaining psychological well-being and/or adaptation to the aging process is widely scattered and generally inconclusive with regard to significant findings. One way to address the lack of a systematic research thrust is to replicate previous work. The purpose of the study reported herein was to replicate Costa and Kastenbaum's 1967 study of the relationship between past memories and future ambitions of centenarians using data from the Georgia Centenarian Study. Ninety-seven centenarians and 189 eighty- and sixty-year-olds were asked the same four questions as found in the Costa and Kastenbaum study. Contrary to Costa and Kastenbaum's results, no significant relationship was found between the ability to recall three types of past events and being able to conceive of the future in the Georgia study. Other similarities and differences in findings between the two studies are discussed.
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Affiliation(s)
- S B Merriam
- University of Georgia, College of Education, Athens 30602, USA
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Poon L, Partika N, Bolman W. New hope in the treatment of autism in Hawaii. Hawaii Med J 1994; 53:194-5, 199. [PMID: 7928306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- L Poon
- John A. Burns School of Medicine, Autism Society of Hawaii
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Martin V, McCutcheon LJ, Poon L, Shen H, Cory CR, O'Brien PJ. Comparative mammal model of chronic rate overload: relationship of myocardial Ca-cycling to heart, metabolic and lipoperoxidation rates. Comp Biochem Physiol B 1993; 106:453-61. [PMID: 8243066 DOI: 10.1016/0305-0491(93)90328-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
1. The cardiac cycle is generally believed to be timed by a sarcoplasmic Ca-cycle and powered by a sarcoplasmic ATP-cycle that uses fatty acids as fuel and generates toxic free radicals as a side-product. 2. This study used a comparative mammal approach to test this model and the hypothesis that these cycles were closely coupled and correlated with fatty acid oxidation and peroxidative injury. 3. Fatty acid oxidation and ATP-cycling rates correlated to log heart rate whereas Ca-cycling rate was directly coupled to heart rate in a one-to-one relationship. 4. Both Ca-pump and Ca-channel activities coordinately increased as heart rate increased across species. 5. Thus, Ca-cycling activity is constant across mammals, when normalized to heart rate. 6. Comparison of Ca-ATPase and Ca-flux rates indicated that sarcoplasmic volume was inversely correlated with log heart rate. Basal lipoperoxidation of myocardium and susceptibility of SR to lipoperoxidation correlated with metabolic rate. 7. We identified that the horse is a metabolic outlier amongst mammals, with abnormally high fatty acid oxidation and ATP-synthetase activity compared to its heart rate.
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Affiliation(s)
- V Martin
- Department of Pathology, Ontario Veterinary College, University of Guelph, Canada
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Abstract
Previous studies found task and vision performance differences between presbyopic contact lens corrections and distant contact lenses combined with reading spectacles. The present study was designed to compare task and vision performance with single vision contact lenses and spectacles. Eighteen soft (SCL) and seventeen rigid gas permeable (RGP) successful contact lens wearers were examined and fitted with CR-39 spectacles (SPEX) which corrected their distance vision. Their occupational task performance and visual acuity (high contrast, low contrast, low contrast with glare) were measured while they wore their contact lenses and spectacles. The tasks included putting pointers in straws, filing cards in a box, counting letters on a photograph of a VDT screen, and a distance/near fixation task. Visual acuity scores were lower with SCL than with SPEX. Low contrast visual acuity with glare was reduced by 1.36 letters on a 5-letter row (p less than 0.05) for SCL compared to SPEX. No statistically significant differences in performance times were measured between contact lenses and spectacles. None of the error performance differences were statistically significant; however, more errors were made on each occupational task with soft contact lenses compared to spectacles. The findings suggest nearly equivalent task and visual performance with properly prescribed RGP contact lenses and spectacles, and minimal performance decrements with SCL compared to spectacles.
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Affiliation(s)
- J E Sheedy
- Morton D. Sarver Laboratory for Contact Lens and Corneal Research, School of Optometry, University of California, Berkeley
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Wiesner K, Jay EW, Demerson JC, Kanno T, Krepinský J, Poon L, Tsai TY, Vilím A, Wu CS. The total synthesis of delphinine: a stereoselective synthesis of an advanced relay compound. Experientia 1970; 26:1030-3. [PMID: 5478617 DOI: 10.1007/bf02114180] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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