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Use of a Hanging Weight System for Coronary Artery Occlusion in Mice

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Published on: April 19, 2011

Nitric oxide triggers classic ischemic preconditioning.

Amanda Lochner¹, Erna Marais, Eugene Du Toit

¹Diabetes Research Group, MRC of South Africa, Republic of South Africa. alo@gerga.sun.ac.za

Annals of the New York Academy of Sciences

|June 22, 2002

Summary

Nitric oxide (NO) triggers myocardial preconditioning, offering protection against ischemia. This protection involves cGMP and reduced p38 MAPK activity, suggesting NO preconditioning may be superior to ischemic preconditioning.

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Area of Science:

Cardiovascular Physiology
Molecular Cardiology

Background:

The precise role of nitric oxide (NO) in myocardial ischemic preconditioning remains unclear.
Investigating NO's involvement is crucial for understanding cardiac protection mechanisms.

Purpose of the Study:

To elucidate the role of NO in the classic ischemic preconditioning of the myocardium.
To compare the protective effects of NO-donor preconditioning versus traditional ischemic preconditioning.

Main Methods:

Utilized an isolated perfused rat heart model.
Administered nitric oxide synthase (NOS) inhibitors (L-NAME, L-NNA) and guanylyl cyclase inhibitor (ODQ) during ischemic preconditioning.
Applied NO donors (SNAP, SNP) for preconditioning and assessed functional recovery and p38 MAPK activation.

Main Results:

NOS and guanylyl cyclase inhibition significantly reduced the protective effects of ischemic preconditioning.
NO donors (SNAP, SNP) provided protection against both global and low-flow ischemia.
NO-donor preconditioning resulted in superior functional reserve compared to ischemic preconditioning.
Both NO donors and ischemic preconditioning decreased p38 MAPK activity during sustained ischemia.

Conclusions:

Nitric oxide (NO) acts as a trigger for classic myocardial preconditioning.
Cyclic guanosine monophosphate (cGMP) generation is vital for NO-mediated cardioprotection.
Reduced p38 MAPK activity during sustained ischemia may mediate NO-induced cardiac protection.
Preconditioning with NO may offer greater advantages than ischemic preconditioning.