Authors: mieno, Shigetoshi¹; horimoto, Hitoshi¹; sawa, Yoshiki²; watanabe, Fusao¹; furuya, Eisuke¹; horimoto, Sachiko¹; kishida, Kenji¹; sasaki, Shinjiro¹

Source: Scandinavian Cardiovascular Journal, Volume 39, Number 5, October 2005 , pp. 313-319(7)

Publisher: Informa Healthcare

Abstract:

Background. Ischemic preconditioning (IPC) protects hearts against ischemia by reducing infarct size. However, IPC does not preserve cardiac function, such as left ventricular peak developed pressure (LVPDP). Moreover, IPC fails to protect the post-myocardial infarct (MI) heart. Design. Rat hearts were transfected with β 2-adrenergic receptor (B2AR) cDNA by the hemagglutinating virus of Japan–liposome method. After the gene transfer, the hearts were perfused in a Langendorff mode and preconditioned with two cycles of 5 min of ischemia and reperfusion. After 20 min of global ischemia, the hearts were reperfused under aerobic conditions for 90 min. LVPDP was measured as an indicator of the cardiac function. Results. LVPDP of ischemic hearts was well preserved by the combination treatment of IPC and gene transfer of B2AR, but not IPC or gene transfer of B2AR alone. Moreover, the treatment was beneficial to even the post-MI heart. On the contrary, gene transfer of β- adrenergic receptor kinase 1 (BARK1) reduced the protective effect of IPC. We also found that the mRNA ratio of B2AR and BARK1 was well correlated with the preservation of the LVPDP. Conclusions. The combination treatment of IPC and gene transfer of B2AR protects cardiac function against ischemia and it shows the beneficial effect also in post-MI hearts.

Keywords: Ischemia; beta adrenergic receptor; reperfusion

Document Type: Research article

DOI: http://dx.doi.org/10.1080/14017430510009104

Affiliations: 1: Department of Thoracic and Cardiovascular Surgery, Osaka Medical College, Takatsuki, Japan 2: Department of Surgery, Course of Interventional Medicine (E1), Osaka University Graduate School of Medicine, Osaka, Japan

Publication date: 2005-10-01

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