کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2983088 1578683 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Remote ischemic preconditioning elaborates a transferable blood-borne effector that protects mitochondrial structure and function and preserves myocardial performance after neonatal cardioplegic arrest
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی کاردیولوژی و پزشکی قلب و عروق
پیش نمایش صفحه اول مقاله
Remote ischemic preconditioning elaborates a transferable blood-borne effector that protects mitochondrial structure and function and preserves myocardial performance after neonatal cardioplegic arrest
چکیده انگلیسی

ObjectiveRemote ischemic preconditioning is known to elicit production of a blood-borne cardioprotective factor that is infarct sparing in models of ischemia–reperfusion injury and myocardial damage reducing after cardiopulmonary bypass in human subjects. The mechanism of protection remains incompletely understood. In this study, we examined effects on mitochondrial structure and function in a noninfarct model of cardioplegic arrest.MethodsExplanted neonatal rabbit hearts were mounted in a Langendorff preparation and perfused with dialysate of blood taken from sham-treated or remotely preconditioned rabbits. Each heart was subsequently subjected to 1-hour cardioplegic arrest and 30-minute reperfusion periods, during which hemodynamic responses were measured. Mitochondria were isolated for structural and functional measurements.ResultsRelative to hearts with sham-treated dialysate, myocardial performance (systolic pressure, maximum positive and negative first derivatives of left ventricular pressure, and left ventricular end-diastolic pressure) was better preserved with dialysate from preconditioned rabbits. Similarly, mitochondria isolated from hearts with dialysate from preconditioned rabbits showed preserved respiration at complex I and IV in the electron transport chain (P < .01 and P < .05, respectively). Mitochondrial outer membrane integrity was also preserved, with diminished sensitivity of mitochondrial respiration to exogenous cytochrome c (P < .01) and less cytosolic diffusion of cytochrome c (P < .01). Mitochondrial resistance to calcium-mediated mitochondrial permeability transition pore opening was not affected.ConclusionThe cardioprotective factor in plasma dialysate after remote preconditioning preserves mitochondrial structure and function in a noninfarct cardioplegic arrest model. This protection is associated with preservation of global myocardial performance.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Thoracic and Cardiovascular Surgery - Volume 136, Issue 2, August 2008, Pages 335–342
نویسندگان
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