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- W2106073092 abstract "Several studies have shown that folliculo-stellate cells (FS cells) in the anterior pituitary gland exhibit paracrine functions. Recently, we established a pituitary FS-like cell line, TtT/GF, which was derived from an isologously transplantable pituitary thyrotropic tumor line induced by radiothyroidectomy. In studies to examine the function of FS cells, we found that two forms of a novel hypophysiotropic peptide, pituitary adenylate cyclase-activating polypeptide (PACAP), were potent activators of TtT/GF cells. Both the 27- and 38-amino acid forms of PACAP (PACAP-27 and PACAP-38) and vasoactive intestinal peptide (VIP) increased the levels of cAMP in TtT/GF cells in a similar dose-dependent manner. PACAP-27 and PACAP-38 specifically stimulated the proliferation of TtT/GF cells dose dependently, whereas VIP was ineffective. The minimal effective concentration of the PACAPs inducing cell proliferation was between 10(-8)-10(-7) M. However, PACAP-27 was much less potent than PACAP-38 in stimulating cell proliferation and DNA synthesis. PACAP-38, PACAP-27, and VIP all stimulated the release of interleukin-6 (IL-6) from TtT/GF cells. PACAP 38 (10(-8) M) stimulated IL-6 production effectively within 1 h of incubation, and the level attained at 8 h of cultivation (620 pg/ml) was nearly 10-fold that in the absence of PACAP-38 (60 pg/ml). PACAP-38 and VIP stimulated IL-6 secretion significantly at 10(-10)-10(-9) M in a bell-shaped manner; the maximum values were 10(-7) and 10(-8) M, respectively. On the other hand, IL-6 secretion stimulated by PACAP-27 became saturated at 10(-8) M, and the maximum value (320 pg/ml) was about 25% of that stimulated by PACAP-38 (1280 pg/ml). These findings obtained using TtT/GF cells as a model of FS cells suggest that PACAP acts as a hypophysiotropic factor, which targets FS cells and stimulates their proliferation, adenylate cyclase activation, and IL-6 secretion." @default.
- W2106073092 created "2016-06-24" @default.
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- W2106073092 date "1993-11-01" @default.
- W2106073092 modified "2023-10-12" @default.
- W2106073092 title "Pituitary folliculo-stellate-like cell line (TtT/GF) responds to novel hypophysiotropic peptide (pituitary adenylate cyclase-activating peptide), showing increased adenosine 3',5'-monophosphate and interleukin-6 secretion and cell proliferation." @default.
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- W2106073092 doi "https://doi.org/10.1210/endo.133.5.8404665" @default.
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