{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,5]],"date-time":"2026-05-05T01:56:33Z","timestamp":1777946193257,"version":"3.51.4"},"reference-count":0,"publisher":"S. Karger AG","license":[{"start":{"date-parts":[[2008,6,6]],"date-time":"2008-06-06T00:00:00Z","timestamp":1212710400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/karger.com\/pages\/terms-and-conditions"},{"start":{"date-parts":[[2008,6,6]],"date-time":"2008-06-06T00:00:00Z","timestamp":1212710400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/karger.com\/pages\/terms-and-conditions"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Pharmacology"],"abstract":"<jats:p>We have investigated the presence and nature of muscarinic binding sites on membranes from cultured bovine pulmonary arterial endothelial cells (BPAE). BPAE were harvested and subcultured nonenzymatically; experiments were performed 3-5 days postconfluence and between 10 and 25 passage numbers. Utilizing radioligand binding techniques with the muscarinic receptor antagonists [3H]3-quinuclidinyl benzilate ([3H]QNB) and [3H]N-methylscopolamine ([3H]MS) as probes, we identified a small population of atropine-sensitive muscarinic sites (1,800-2,000 sites\/cell or 7-8 fmol\/mg protein). Muscarinic binding sites on BPAE membranes resembled classical muscarinic receptors in that (a) the binding of 2 nM [3H]QNB was inhibited by muscarinic agonists and antagonists, (b) [3H]QNB binding was 30 times more sensitive to R(\u2013)- than to S(+)-QNB, (c) binding of the muscarinic receptor agonist carbamylcholine involved high and low affinity components, (d) the stable GTP analog, Gpp(NH)p (100 \u00b5M) shifted agonist binding curves to the right by a factor of three, and (e) the high affinity binding of the agonist [3H]oxotremorine-M to muscarinic receptors was depressed by Gpp(NH)p. On the other hand, gallamine, which allosterically regulates muscarinic receptor binding in other tissues, did not affect the rates of dissociation of [3H]QNB, [3H]MS or [3H]oxotremorine-M from BPAE binding sites. We concluded that BPAE in culture exhibit muscarinic binding sites which possess many but not all of the properties associated with classical muscarinic receptors.<\/jats:p>","DOI":"10.1159\/000138937","type":"journal-article","created":{"date-parts":[[2008,6,6]],"date-time":"2008-06-06T05:40:33Z","timestamp":1212730833000},"page":"324-333","source":"Crossref","is-referenced-by-count":4,"title":["Muscarinic Binding Sites on Bovine Pulmonary Arterial Endothelial Cells in Culture"],"prefix":"10.1159","author":[{"given":"Robert S.","family":"Aronstam","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Una S.","family":"Ryan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John D.","family":"Catravas","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"127","published-online":{"date-parts":[[2008,6,6]]},"container-title":["Pharmacology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/karger.com\/article-pdf\/doi\/10.1159\/000138937","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,5,2]],"date-time":"2026-05-02T15:58:43Z","timestamp":1777737523000},"score":1,"resource":{"primary":{"URL":"https:\/\/karger.com\/article\/doi\/10.1159\/000138937"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2008,6,6]]},"references-count":0,"URL":"https:\/\/doi.org\/10.1159\/000138937","archive":["Portico"],"relation":{},"ISSN":["0031-7012","1423-0313"],"issn-type":[{"value":"0031-7012","type":"print"},{"value":"1423-0313","type":"electronic"}],"subject":[],"published":{"date-parts":[[2008,6,6]]}}}