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Cardiovascular Research 2002 55(3):474-482; doi:10.1016/S0008-6363(02)00288-2
© 2002 by European Society of Cardiology
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Copyright © 2002, European Society of Cardiology

Innate immunity and cardiac preconditioning: a putative intrinsic cardioprotective program

Robert M Smith, Sandrine Lecour and Michael N Sack*

Hatter Institute for Cardiology Research, MRC Inter-University Cape Heart Group, University of Cape Town Medical School, 7925 Cape Town, South Africa

* Corresponding author. Tel.: +27-21-406-6358; fax: +27-21-447-8789 sack{at}capeheart.uct.ac.za

Ischemic preconditioning is thought to evoke cell survival programs in the heart in large part via the activation of GI-protein coupled receptor signal transduction pathways. However, the identification and characterization of GI-protein coupled receptor independent pathways would enable researchers to pursue novel cellular events that could direct or promote preconditioning. In this regard recent work has begun to explore the role of the innate immune system in intrinsic cardioprotection against both viral myocarditis and ischemia. Interestingly, cytokines such as TNF{alpha}, IL-1β and leukemia inhibitory factor, which are components of innate immunity, have been shown to mimic ischemic preconditioning. Thus as the innate immune system functions via a diverse array of GI-protein independent receptors, the study of this immunological system in the heart may provide new insight into mechanisms driving and promoting ischemic preconditioning. We propose that innate immunity is indeed an integral part of ischemic preconditioning. In this review, we provide an overview of the innate immune system, describe the studies whereby cytokines mimic ischemic preconditioning and finally postulate some mechanisms whereby innate immunity may promote cardioprotection as a component of preconditioning.

KEYWORDS Cytokines; Immunology; Ischemia; Preconditioning; Signal transduction


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