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• W2014646007 abstract "Pituitary samples were obtained from female rats at various stages of the estrous cycle, and from intact male and gonadectomized rats with and without estradiol treatment. The pituitary extracts with 60% EtOH pH 9.5, were fractionated by preparative isoelectric focusing (IEF), and immunoreactive prolactin (IR-PRL) was measured by RIA. Three types of IR-PRL molecular species were found in these IEF profiles. The first type (species A) was consistently found in an area of pH 4.5-5.4, and consisted of two main subspecies with pls 5.0 (Al) and 5.25 (A2). Species A occupied most part of pituitary IR-PRL in males, gonadectomized animals, and in females in a basal state such as diestrus (D) II 17:00. Species A was also found exclusively in the serum at proestrus (PE) 19:00. The amounts of species A decreased notably when the secretion became active from PE 15:00 to 22:00, then increased at estrus (E) 6:00 and 10:00 when the second type (species B), which was found in the area of pH 5.4-6.8 only in trace amounts at basal states, increased markedly. Species B decreased again at E 17:00, while species A fully recovered. Species B also increased when PRL biosynthesis was stimulated by estradiol in intact male and gonadectomized rats. These findings indicate that species A must be the storage and secretory type of IR-PR, and that species B must be IR-PRL in the biosynthetic process which is to be finally converted into species A. A third type (species C) was found in a region of pH 3.5-4.5 in the IEF profiles of gonadectomized animals. This species is possibly IR-PRL molecules under degradation. When the pituitary was extracted serially with 0.25 M ammonium sulfate pH 5.5 (fraction AMS) first, then with 60% EtOH pH 9.5 (fraction ET), fraction AMS contained mostly species B and C, while fraction ET contained species A almost exclusively. The results obtained with this differential extraction roughly coincided with IEF data, though some disagreements were observed." @default.
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• W2014646007 title "Charge heterogeneity of rat pituitary prolactin in relation to the estrous cycle, gonadectomy, and estrogen treatment." @default.
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• W2014646007 doi "https://doi.org/10.1507/endocrj1954.32.725" @default.
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