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Title: Ischemic preconditioning of the whole heart confers protection on subsequently isolated ventricular myocytes
Authors: Rodrigo, Glenn C.
Samani, Nilesh J.
First Published: 2007
Publisher: American Physiological Society
Citation: American journal of physiology. Heart and circulatory physiology, 2008, 294(1), pp.H524-H531.
Abstract: Current cellular models of ischemic preconditioning (IPC) rely on inducing preconditioning in vitro and may not accurately represent complex pathways triggered by IPC in the intact heart. Here, we show that it is possible to precondition the intact heart and to subsequently isolate individual ventricular myocytes that retain the protection triggered by IPC. Myocytes isolated from Langendorff-perfused hearts preconditioned with three cycles of ischemia-reperfusion were exposed to metabolic inhibition and reenergization. Injury was assessed from induction of hypercontracture and loss of Ca2+ homeostasis and contractile function. IPC induced an immediate window of protection in isolated myocytes, with 64.3 ± 7.6% of IPC myocytes recovering Ca2+ homeostasis compared with 16.9 ± 2.4% of control myocytes (P < 0.01). Similarly, 64.1 ± 5.9% of IPC myocytes recovered contractile function compared with 15.3 ± 2.2% of control myocytes (P < 0.01). Protection was prevented by the presence of 0.5 mM 5-hydroxydecanoate during the preconditioning stimulus. This early protection disappeared after 6 h, but a second window of protection developed 24 h after preconditioning, with 54.9 ± 4.7% of preconditioned myocytes recovering Ca2+ homeostasis compared with 12.6 ± 2.9% of control myocytes (P < 0.01). These data show that "true" IPC of the heart confers both windows of protection in the isolated myocytes, with a similar temporal relationship to in vivo preconditioning of the whole heart. The model should allow future studies in isolated cells of the protective mechanisms induced by true ischemia.
DOI Link: 10.1152/ajpheart.00980.2007
ISSN: 0363-6135
eISSN: 1522-1539
Type: Article
Description: The original published article is available at: DOI: 10.1152/ajpheart.00980.2007
Appears in Collections:Published Articles, Dept. of Cardiovascular Sciences

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