Adenosine acts as an endogenous activator of the cellular antioxidant defense system.

Abstract:

:Oxygen free radicals have been implicated in the pathogenesis of ischemic cell injuries. These free radicals are normally scavenged by antioxidant enzymes. Adenosine is normally released during ischemia and protects against ischemic injuries by interacting with adenosine receptors (ARs). The mechanism underlying its cytoprotective action is unclear. In this report, we provide evidence that activation of a unique A3AR in rat basophilic leukemia cells (RBL-2H3) leads to a 2 to 3 fold increase in activity of superoxide dismutase, catalase and glutathione peroxidase and also increases in the activity of glutathione reductase. Similar increases in enzyme activity were elicited in bovine and human endothelial cells, rat cardiac myocytes and smooth muscle cells. Increases in enzyme activity were attenuated by theophylline (an antagonist of the A3AR) and by pertussis toxin, implicating a role of A3AR/Gi protein in the activation. Importantly, activation of the A3AR decreased the degree of lipid peroxidation in these cells. These data provide strong evidence that the cytoprotective action of adenosine during ischemic cell injuries is mediated, at least in part, via a novel mechanism-activation of the cellular antioxidant enzymes.

authors

Maggirwar SB,Dhanraj DN,Somani SM,Ramkumar V

doi

10.1006/bbrc.1994.1731

subject

Has Abstract

pub_date

1994-06-15 00:00:00

pages

508-15

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(84)71731-1

journal_volume

201

pub_type

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