Abstract:
:We have previously reported that medium conditioned by hypoxic pulmonary artery endothelial cells (ECCM) contains a factor of small molecular weight that inhibits the growth of pulmonary artery smooth muscle cells (SMC). We postulated that this factor might be a breakdown product of ATP and, therefore, measured the levels of hypoxanthine/xanthine (HX/X) and uric acid (UA) in ECCM and cell lysates from endothelial cells (EC) exposed to hypoxia and normoxia. Although hypoxic and normoxic cell lysates contained no UA and an equal amount of HX/X (2.9 +/- 0.3 and 2.9 +/- 0.5 microM, respectively), there was a 5-fold increase in the amount of HX/X present in hypoxic compared with normoxic ECCM (3.4 +/- 0.3 versus 0.6 +/- 0.4 microM, respectively; P less than 0.001) but no difference in UA levels (5 +/- 2 versus 5 +/- 1 microM, respectively). In separate experiments, we examined the effects of exogenous HX, X, and UA (doses ranging from 0.1 to 100 microM) on the proliferation of pulmonary and aortic SMC and pulmonary artery EC. Our results indicate that HX, X, and UA inhibit the proliferation of SMC in a dose-dependent manner without causing injury to the cells. The proliferation of EC, on the other hand, was not affected by UA and was significantly inhibited by HX and X only at doses of 100 microM. In conclusion, we have found that significant amounts of HX/X accumulate in hypoxic ECCM and that HX, X, and UA inhibit the proliferation of SMC. The relevance of these findings to conditions where hypoxia prevails is discussed.
journal_name
Am J Respir Cell Mol Biolauthors
Hassoun PM,Shedd AL,Lanzillo JJ,Thappa V,Landman MJ,Fanburg BLdoi
10.1165/ajrcmb/6.6.617keywords:
subject
Has Abstractpub_date
1992-06-01 00:00:00pages
617-24issue
6eissn
1044-1549issn
1535-4989journal_volume
6pub_type
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