{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,19]],"date-time":"2025-09-19T11:00:46Z","timestamp":1758279646435},"reference-count":36,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2005,2,4]],"date-time":"2005-02-04T00:00:00Z","timestamp":1107475200000},"content-version":"vor","delay-in-days":11388,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal Cellular Physiology"],"published-print":{"date-parts":[[1973,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The effects of colchicine and 2\u2010Br\u2010\u03b1\u2010ergocryptine\u2010methane\u2010sulfonate (CB 154) on the release of prolactin and growth hormone have been studied in a clonal strain of rat pituitary tumor cells (GH<jats:sub>3<\/jats:sub>) in monolayer culture. These cultures produce both prolactin and growth hormone and release both proteins spontaneously into the medium without storing them in large amounts. Immunological methods were used to measure both intracellular and extracellular concentrations of the hormones. Colchicine (5 \u00d7 10<jats:sup>\u22126<\/jats:sup> M for 3 hours) caused a 2\u2010 to 3\u2010fold increase in intracellular concentrations of prolactin and growth hormone but, under basal conditions, had little or no measurable effect on the amounts of hormone accumulated in the medium during the course of the standard three hour treatment period. This latter finding evidently is due to a lag in the onset of drug action. Colchicine had little or no effect on accumulation of extracellular prolactin during the first two hours of treatment whereas such accumulation was depressed by over 60% during the third hour of treatment. Previous studies have shown that treatment of GH<jats:sub>3<\/jats:sub> cells with thyrotropin releasing hormone (TRH) and hydrocortisone (HC) increases both intra and extracellular levels of prolactin and growth hormone, respectively. In cultures treated with TRH (5 \u00d7 10<jats:sup>\u22128<\/jats:sup> M), colchicine (5 \u00d7 10<jats:sup>\u22126<\/jats:sup> M for 3 hours) increased intracellular prolactin by about 70% and decreased extracellular hormone by 10%. In cultures treated with HC (3 \u00d7 1O<jats:sup>\u22126<\/jats:sup> M), colchicine increased intracellular growth hormone by more than 100% and decreased medium concentrations of the hormone by 15%. Colchicine did not significantly alter total hormone (intracellular + extracellular) accumulation, cellular uptake of <jats:sup>3<\/jats:sup>H\u2010amino acids, or total cell protein synthesis. The synthetic ergot alkaloid, CB 154, (3.3 \u00d7 10<jats:sup>\u22126<\/jats:sup> M for 3 hours) caused an 80% increase in intracellular, and a nearly 50% decrease in extracellular, prolactin without affecting the accumulation of growth hormone, the uptake of <jats:sup>3<\/jats:sup>H\u2010labeled amino acids, or overall protein synthesis in the cultures. Elevation of medium potassium concentration from a basal value of 5.3 mM to 3\u20135 \u00d7 10<jats:sup>\u22122<\/jats:sup> M (by addition of KCl) decreased intracellular levels of prolactin by 85% and growth hormone by 55%. These effects of high potassium were blocked by colchicine and by CB 154. We conclude that colchicine, after a lag period of two hours, acts to inhibit the release of prolactin and growth hormone from GH<jats:sub>3<\/jats:sub> cells. By the end of three hours of treatment, this inhibition is over 60% complete in the case of prolactin. The qualitatively different effects of colchicine and CB 154 on prolactin and growth hormone release suggest that these two secretory blocking agents probably act on GH<jats:sub>3<\/jats:sub> cells by different mechanisms.<\/jats:p>","DOI":"10.1002\/jcp.1040820310","type":"journal-article","created":{"date-parts":[[2005,2,26]],"date-time":"2005-02-26T18:13:45Z","timestamp":1109441625000},"page":"401-409","source":"Crossref","is-referenced-by-count":28,"title":["Effects of colchicine and 2\u2010Br\u2010\u03b1\u2010Ergocryptine\u2010methane\u2010sulfonate (CB 154) on the release of prolactin and growth hormone by functional pituitary tumor cells in culture"],"prefix":"10.1002","volume":"82","author":[{"given":"Kaare M.","family":"Gautvik","sequence":"first","affiliation":[]},{"suffix":"Jr.","given":"Richard F.","family":"Hoyt","sequence":"additional","affiliation":[]},{"suffix":"Jr","given":"Armen H.","family":"Tashjian","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2005,2,4]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1083\/jcb.43.3.432"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1083\/jcb.34.2.525"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1042\/bj1270143"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1210\/endo-92-2-573"},{"key":"e_1_2_1_6_1","first-page":"158","article-title":"Histamine release from rat peritoneal mast cells: Inhibition by colchicine and potentiation by deuterium oxide","volume":"164","author":"Gillispie E.","year":"1968","journal-title":"J. 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