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. 1995 Apr;114(8):1577–1586. doi: 10.1111/j.1476-5381.1995.tb14942.x

Stimulation of human umbilical vein endothelial cell proliferation by A2-adenosine and beta 2-adrenoceptors.

V Sexl 1, G Mancusi 1, S Baumgartner-Parzer 1, W Schütz 1, M Freissmuth 1
PMCID: PMC1510404  PMID: 7599925

Abstract

1. Adenosine is known to stimulate capillary outgrowth and endothelial cell proliferation, but the underlying mechanism has not been identified. In order to identify the receptor subtype involved, the effects of adenosine receptor agonists and antagonists on human umbilical vein endothelial cell (HUVEC) proliferation were investigated. 2. Raising intracellular adenosine levels by use of the adenosine transport inhibitor, 4-nitrobenzylthioinosine (NBMPR) did not affect cell growth. This observation suggests that stimulation of an extracellular adenosine receptor generates the mitogenic signal. 3. In the presence of adenosine deaminase (ADA), which was used to remove adenosine present in the culture medium, the adenosine receptor agonists N-ethylcarboxamidoadenosine (NECA, non-selective) and CGS21680 (A2A-receptor-selective) stimulated [3H]-thymidine incorporation with a half-maximum effect at about 10 nM, while N6-cyclopentyladenosine (CPA, A1-selective) was about 100 fold less potent. The adenosine receptor antagonist, xanthine amine congener (XAC) produced a concentration-dependent decrease in endothelial cell proliferation with a half-maximum effect at about 10 nM. Hence, stimulation of an endothelial A2A-adenosine receptor seems responsible for the mitogenic signal. 4. In the presence of ADA, isoprenaline is also able to stimulate [3H]-thymidine incorporation with a half maximal effect of about 3 nM, an effect, which is reversed by the highly beta 2-selective antagonist, ICI 118,551. In the absence of ADA, isoprenaline exerts only a minor stimulatory effect. Combination of A2A adenosine and beta 2-adrenoceptor agonists did not further enhance [3H]-thymidine incorporation when compared to the sole addition of each agonist. We therefore conclude that both receptors stimulate endothelial cell proliferation via a common signal transduction pathway.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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