{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,13]],"date-time":"2025-12-13T23:06:37Z","timestamp":1765667197416},"reference-count":0,"publisher":"American Physiological Society","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["American Journal of Physiology-Cell Physiology"],"published-print":{"date-parts":[[1993,1,1]]},"abstract":"<jats:p> Pretreating confluent T84 cells with the phorbol ester phorbol 12-myristate 13-acetate (PMA) inhibits adenosine 3',5'-cyclic monophosphate (cAMP)- and carbachol-induced Cl secretion. Both a sustained short-circuit current (Isc), seen after the addition of 50 microM 8-(4-chlorophenylthio)adenosine 3',5'-cyclic monophosphate (CPT-cAMP) and 100 microM 3-isobutyl-1-methylxanthine (IBMX), and a transient current, seen after the subsequent addition of 100 microM carbachol, are inhibited by 80% following pretreatment with 100 nM PMA for 2 h. Pretreatment with PMA has no effect on the level of cystic fibrosis transmembrane conductance regulator protein or apical cAMP-dependent Cl conductance. Carbachol does not induce an increase in apical Cl conductance. Basolateral K conductance was measured in monolayers treated with apical nystatin and exposed to a K gradient. Agonist-independent K conductance is 10-fold greater in Cl media than in gluconate media. Pretreatment with PMA inhibits agonist-independent K conductance by 57% in Cl media but stimulates K conductance by 1.9-fold in gluconate media. The addition of carbachol induces a transient increase in basolateral K conductance, and pretreatment with PMA inhibits the agonist-dependent K conductance by 66% in Cl media and by 92% in gluconate media. In Cl media, serosal barium, at 3 mM, inhibits agonist-independent K conductance but has no significant effect on the carbachol-induced conductance. In nonpermeabilized monolayers, serosal barium inhibits the cAMP-dependent Isc by 56% but has no effect on the carbachol-induced Isc. These results demonstrate that the primary effect of PMA on Cl secretion is not inhibition of apical Cl channels but inhibition of basolateral K channels.(ABSTRACT TRUNCATED AT 250 WORDS) <\/jats:p>","DOI":"10.1152\/ajpcell.1993.264.1.c161","type":"journal-article","created":{"date-parts":[[2017,12,24]],"date-time":"2017-12-24T13:52:36Z","timestamp":1514123556000},"page":"C161-C168","source":"Crossref","is-referenced-by-count":51,"title":["Inhibition of cAMP- and Ca-dependent Cl- secretion by phorbol esters: inhibition of basolateral K+ channels"],"prefix":"10.1152","volume":"264","author":[{"given":"W. W.","family":"Reenstra","sequence":"first","affiliation":[{"name":"Children's Hospital Oakland Research Institute, California."}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"24","container-title":["American Journal of Physiology-Cell Physiology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.physiology.org\/doi\/pdf\/10.1152\/ajpcell.1993.264.1.C161","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,6,17]],"date-time":"2024-06-17T19:42:37Z","timestamp":1718653357000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.physiology.org\/doi\/10.1152\/ajpcell.1993.264.1.C161"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1993,1,1]]},"references-count":0,"journal-issue":{"issue":"1","published-print":{"date-parts":[[1993,1,1]]}},"alternative-id":["10.1152\/ajpcell.1993.264.1.C161"],"URL":"https:\/\/doi.org\/10.1152\/ajpcell.1993.264.1.c161","relation":{},"ISSN":["0363-6143","1522-1563"],"issn-type":[{"value":"0363-6143","type":"print"},{"value":"1522-1563","type":"electronic"}],"subject":[],"published":{"date-parts":[[1993,1,1]]}}}