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Quesada Ocete B, Quesada Dorador A, Diez Albero L, Bochard-Villanueva B, Rubini-Costa R, Paya-Serrano R, Rubini-Puig R, Lopez-Valero L, Fernandez-Diaz C, Palanca-Gil V, Ruiz-Moliner C, Jimenez-Bello J, De La Espriella R, Perdomo D, Trejo-Velasco B. P1217Impact of diabetes mellitus in the clinical presentation and outcomes of atrial fibrillation. Europace 2018. [DOI: 10.1093/europace/euy015.699] [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)
| | - A Quesada Dorador
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
| | - L Diez Albero
- Faculty of Medicine, Catholic University of Valencia “San Vicente Martir”, Valencia, Spain
| | - B Bochard-Villanueva
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
| | - R Rubini-Costa
- Faculty of Medicine, Catholic University of Valencia “San Vicente Martir”, Valencia, Spain
| | - R Paya-Serrano
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
| | - R Rubini-Puig
- University General Hospital of Valencia, Emergency Department, Valencia, Spain
| | - L Lopez-Valero
- Faculty of Medicine, Catholic University of Valencia “San Vicente Martir”, Valencia, Spain
| | - C Fernandez-Diaz
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
| | - V Palanca-Gil
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
| | - C Ruiz-Moliner
- Faculty of Medicine, Catholic University of Valencia “San Vicente Martir”, Valencia, Spain
| | - J Jimenez-Bello
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
| | - R De La Espriella
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
| | - D Perdomo
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
| | - B Trejo-Velasco
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
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Lee C, Perdomo D, Czaja S, Schulz R. HISTORICAL TRENDS IN DEMENTIA FAMILY-CARE: A NEW GENERATION OF CAREGIVERS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.2911] [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: 11/13/2022] Open
Affiliation(s)
- C. Lee
- Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Miami, Florida,
| | - D. Perdomo
- Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Miami, Florida,
| | - S.J. Czaja
- Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Miami, Florida,
| | - R. Schulz
- University of Pittsburgh, Pittsburgh, Pennsylvania
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Tiffert T, Daw N, Perdomo D, Lew VL. A fast and simple screening test to search for specific inhibitors of the plasma membrane calcium pump. J Lab Clin Med 2001; 137:199-207. [PMID: 11241030 DOI: 10.1067/mlc.2001.113112] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
No specific inhibitors of the plasma membrane Ca(2+) pump have been found to date, limiting research on the particular contribution of this pump to the Ca(2+) homeostasis of animal cells. The search for Ca(2+) pump inhibitors may have been hampered by the lack of an efficient screening method to measure pump activity that would provide an alternative to the lengthy and costly adenosine triphosphatase or Ca(2+)-flux measurements. We propose here a novel screening method in which Ca(2+) pump inhibition is translated into easily measurable cell dehydration. Intact human red cells, suspended in Ca(2+)-containing, low-K(+) buffers were exposed to sequential additions of (1) ionophore A23187 (t = 0) to load the cells with Ca(2+); (2) CoCl(2) (t = 1 minute) to block ionophore-mediated Ca(2+) transport and to allow complete extrusion of the Ca(2+) load by the pump in less than 5 minutes; and (3) NaSCN (t = 6 minutes) to accelerate cell dehydration via Ca(2+)-sensitive K(+) channels when the Ca(2+) load is retained as a result of Ca(2+) pump inhibition. Samples were taken at 10 to 25 minutes after ionophore addition and delivered into hypotonic media containing about 45 mmol/L NaCl. Non-dehydrated cells-with normal, uninhibited pumps-instantly underwent lysis, whereas dehydrated cells-with inhibited pumps-resisted lysis, resulting in translucent or opaque samples, respectively, which were quantifiable by light-absorption measurements. Vanadate was used as a test substance to assess the effect of putative pump inhibitors. This method offers a cost-efficient and easily automated alternative for testing large numbers of natural or synthetic agents.
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Affiliation(s)
- T Tiffert
- Physiological Laboratory, University of Cambridge, United Kingdom
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Abstract
Previous studies have shown that ferriprotoporphyrin IX (FP) and non-heme iron have a marked inhibitory effect on the Ca(2+)-Mg(2+)-ATPase activity of isolated red cell membranes, the biochemical counterpart of the plasma membrane Ca(2+) pump (PMCA). High levels of membrane-bound FP and non-heme iron have been found in abnormal red cells such as sickle cells and malaria-infected red cells, associated with a reduced life span. It was important to establish whether sublytic concentrations of FP and non-heme iron would also inhibit the PMCA in normal red cells, to assess the possible role of these agents in the altered Ca(2+) homeostasis of abnormal cells. Active Ca(2+) extrusion by the plasma membrane Ca(2+) pump was measured in intact red cells that had been briefly preloaded with Ca(2+) by means of the ionophore A23187. The FP and nonheme iron concentrations used in this study were within the range of those applied to the isolated red cell membrane preparations. The results showed that FP caused a marginal inhibition ( approximately 20%) of pump-mediated Ca(2+) extrusion and that non-heme iron induced a slight stimulation of the Ca(2+) efflux (11-20%), in contrast to the marked inhibitory effects on the Ca(2+)-Mg(2+)-ATPase of isolated membranes. Thus, FP and non-heme iron are unlikely to play a significant role in the altered Ca(2+) homeostasis of abnormal red cells.
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Affiliation(s)
- T Tiffert
- Physiological Laboratory, University of Cambridge, Downing Street, Cambridge CB2 3EG, United Kingdom
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