Release of anterior pituitary hormones by trypsin-pretreated anterior pituitary cells

Shigeo Takamori, Kunio Shiota*, Tomoya Ogawa

*この研究の対応する著者

研究成果: Article査読

抄録

Hormone-secreting cells in the anterior pituitary (AP) gland can be categorized into two groups with respect to spontaneous release. One line of evidence has suggested relatively high spontaneous release of GH and PRL compared to other hormones. We previously reported that brief pretreatment of AP cells with trypsin severely decreased the spontaneous release of GH and PRL, but increased that of ACTH and TSH, and had no apparent effect on that of LH and FSH. The cell-type specific alteration of spontaneous release indicates involvement of trypsin-sensitive-membrane-proteins (TSMPs) in the mechanism of hormone release in the AP gland. In this study, we examined secretagogue- and high-K+-stimulated release of AP hormones from trypsin-pretreated cells by using a superfusion system. TRH and high K+ did not provoke increased PRL release. Each of the secretagogues and high K+ caused a corresponding elevation of other hormones, i.e., TSH, ACTH, LH, and FSH, suggesting that the TRH receptor and voltage-sensitive Ca2+ channel remained functional. In addition, GRF and high K+ did not result in a corresponding increase in GH release. We concluded that the GH/PRL cell lineage has distinct secretory mechanisms including TSMPs.

本文言語English
ページ(範囲)213-219
ページ数7
ジャーナルJournal of Reproduction and Development
43
3
出版ステータスPublished - 1997
外部発表はい

ASJC Scopus subject areas

  • 動物科学および動物学

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