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Adaptation to chronic hypoxia confers tolerance to subsequent myocardial ischemia by increased nitric oxide production. Ann N Y Acad Sci 1999 Jun 30;874:236-53

Date

07/23/1999

Pubmed ID

10415535

DOI

10.1111/j.1749-6632.1999.tb09239.x

Scopus ID

2-s2.0-0032773216   59 Citations

Abstract

Chronic exposure to hypoxia from birth increased the tolerance of the rabbit heart to subsequent ischemia compared with age-matched normoxic controls. The nitric oxide donor GSNO increased recovery of post-ischemic function in normoxic hearts to values not different from hypoxic controls, but had no effect on hypoxic hearts. The nitric oxide synthase inhibitors L-NAME and L-NMA abolished the cardioprotective effect of hypoxia. Message and catalytic activity for constitutive nitric oxide synthase as well as nitrite, nitrate, and cGMP levels were elevated in hypoxic hearts. Inducible nitric oxide synthase was not detected in normoxic or chronically hypoxic hearts. Increased tolerance to ischemia in rabbit hearts adapted to chronic hypoxia is associated with increased expression of constitutive nitric oxide synthase.

Author List

Baker JE, Holman P, Kalyanaraman B, Griffith OW, Pritchard KA Jr

Authors

John E. Baker PhD Professor in the Surgery department at Medical College of Wisconsin
Balaraman Kalyanaraman PhD Chair, Professor in the Biophysics department at Medical College of Wisconsin
Kirkwood A. Pritchard PhD Professor in the Surgery department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Adaptation, Physiological
Animals
Chronic Disease
Cyclic GMP
Hypoxia
Myocardial Ischemia
Myocardium
Nitrates
Nitric Oxide
Nitric Oxide Synthase
Nitric Oxide Synthase Type II
Nitric Oxide Synthase Type III
Nitrites
RNA, Messenger
Rabbits
jenkins-FCD Prod-482 91ad8a360b6da540234915ea01ff80e38bfdb40a