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. 1994 Dec;113(4):1203–1208. doi: 10.1111/j.1476-5381.1994.tb17125.x

In vitro studies of release of adenine nucleotides and adenosine from rat vascular endothelium in response to alpha 1-adrenoceptor stimulation.

K Shinozuka 1, M Hashimoto 1, S Masumura 1, R A Bjur 1, D P Westfall 1, K Hattori 1
PMCID: PMC1510525  PMID: 7889273

Abstract

1. Noradrenaline-induced release of endogenous adenine nucleotides (ATP, ADP, AMP) and adenosine from both rat caudal artery and thoracic aorta was characterized, using high-performance liquid chromatography with fluorescence detection. 2. Noradrenaline, in a concentration-dependent manner, increased the overflow of ATP and its metabolites from the caudal artery. The noradrenaline-induced release of adenine nucleotides and adenosine from the caudal artery was abolished by bunazosin, an alpha 1-adrenoceptor antagonist, but not by idazoxan, an alpha 2-adrenoceptor antagonist. Clonidine, an alpha 2-adrenoceptor agonist, contracted caudal artery smooth muscle but did not induce release of adenine nucleotides or adenosine. 3. Noradrenaline also significantly increased the overflow of ATP and its metabolites from the thoracic aorta in the rat; however, the amount of adenine nucleotides and adenosine released from the aorta was considerably less than that released from the caudal artery. 4. Noradrenaline significantly increased the overflow of ATP and its metabolites from cultured endothelial cells from the thoracic aorta and caudal artery. The amount released from the cultured endothelial cells from the thoracic aorta and caudal artery. The amount released from the cultured endothelial cells from the aorta was also much less than that from cultured endothelial cells from the caudal artery. In cultured smooth muscle cells from the caudal artery, a significant release of ATP or its metabolites was not observed. 5. These results suggest that there are vascular endothelial cells that are able to release ATP by an alpha 1-adrenoceptor-mediated mechanism, but that these cells are not homogeneously distributed in the vasculature.

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Selected References

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