{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,3]],"date-time":"2025-11-03T08:59:38Z","timestamp":1762160378819},"reference-count":41,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2004,2,19]],"date-time":"2004-02-19T00:00:00Z","timestamp":1077148800000},"content-version":"vor","delay-in-days":9545,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Supramol Struct"],"published-print":{"date-parts":[[1978,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Extracts of rat anterior and intermediate\u2010posterior pituitary were fractionated by sodium dodecyl sulfate polyacrylamide gel electrophoresis and assayed for immunoactive ACTH and endorphin. In both lobes the major forms of immunoactive ACTH have apparent molecular weights of 31,000 (31K), 20\u201321K, 14K, and 4.5K, and the major forms of immunoactive endorphin have apparent molecular weights of 31K (coincident with the peak of immunoactive ACTH), 13K (a \u03b2LPH\u2010like peptide), and 3.5K (a \u03b2\u2010endorphin\u2010like peptide). However, the quantitative distribution of immunoactivity among the various forms differs greatly between the lobes. Assays using an extreme COOH\u2010terminal ACTH antiserum indicate that the 31K ACTH\/endorphin molecule in rat antierior and intermediate pituitary is similar to the pro\u2010ACTH\/endorphin molecule from mouse pituitary tumor cells. A radioimmunoassay that is specific for the NH<jats:sub>2<\/jats:sub>\u2010terminal non\u2010ACTH, nonendorphin segment (referred to as 16K fragment) of the mouse pro\u2010ACTH\/endorphin molecule was used to assay extracts of rat pituitary. In addition to detecting material at 31K and 20\u201321K, the 16K fragment radioimmunoassay detects significant amounts of cross\u2010reactive material with an apparent molecular weight of 16K in extracts of both lobes. This result also suggests that the structure and processing of the rat 31K ACTH\/endorphin molecule is similar to that of mouse tumor cell pro\u2010ACTH\/endorphin.<\/jats:p><jats:p>Cell suspensions were prepared from the anterior and intermediate lobes of the rat pituitary and maintained in culture for a 24\u2010h period. The isolated cells from both lobes incorporate [<jats:sup>3<\/jats:sup>H] phenylalanine into immunoprecipitable ACTH\u2010 and endorphin\u2010containing molecules. By sequential immunoprecipitation with ACTH and endorphin antisera, it is possible to demonstrate directly that a single molecule (31K ACTH\/endorphin) has antigenic determinants for both ACTH and endorphin. Significant amounts of 31K ACTH\/endorphin are released into the culture medium by isolated anterior lobe and intermediate lobe cells. The isolated intermediate lobe cells synthesize and secrete relatively large amounts of a \u03b2\u2010endorphin\u2010like molecule; the isolated anterior lobe cells secrete significant amounts of both a \u03b2LPH\u2010like molecule and a \u03b2\u2010endorphin like molecule. These same quantitative differences between anterior and intermediate lobe tissue were observed in immunoassays of extracts of the separated lobes and probably reflect differences in the processing of the common precursor. The isolated anterior lobe cells can be stimulated to release increased amounts of immunoprecipitable ACTH and endorphin by incubation with a cyclic AMP analog and a phosphodiesterase inhibitor.<\/jats:p>","DOI":"10.1002\/jss.400080304","type":"journal-article","created":{"date-parts":[[2005,5,28]],"date-time":"2005-05-28T05:25:29Z","timestamp":1117257929000},"page":"247-262","source":"Crossref","is-referenced-by-count":145,"title":["Existence of a common precursor to ACTH and endorphin in the anterior and intermediate lobes of the rat pituaitary"],"prefix":"10.1002","volume":"8","author":[{"given":"Betty A.","family":"Eipper","sequence":"first","affiliation":[]},{"given":"Richard 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