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• W2161982920 abstract "In addition to regulating anterior pituitary function by being released from the median eminence, mammalian neurotensin (NT) may also exert an autocrine or a paracrine action within the anterior pituitary. In this study, using double immunostaining with elution restaining, we identified the specific anterior pituitary cells which express NT immunoreactivity (NT-IR) during the rat oestrous cycle. In the normal cycling rat, NT-IR was present in both gonadotrophs and thyrotrophs and displayed plastic changes along the oestrous cycle. Both the number of TSH-NT positive cells and the intensity of immunological reaction were elevated during dioestrus, and decreased through pro-oestrus and early oestrus. NT-IR was also high in both follicle stimulating hormone (FSH)- or luteinizing hormone (LH)-positive cells during early pro-oestrus, and decreased during late pro-oestrus. Treatment of intact rats with either the anti-oestrogens Tamoxifen or LY117018, or the anti-progestagen RU486 prevented the normal expression of NT-IR in thyroid-stimulating hormone (TSH)-, FSH-, and LH-positive cells during pro-oestrus. Bilateral ovariectomy induced a dramatic reduction in the number of NT-IR cells. This effect was completely prevented by treatment of ovariectomized rats with oestradiol and progesterone, and was unaffected by the concurrent administration of a GnRH antagonist. Furthermore, administration of an anti-oestrogen together with an anti-progestagen to ovariectomized-oestrogen, progesterone-treated rats, blocked the stimulatory effect of ovarian hormones on NT-IR in anterior pituitary cells. These findings demonstrate that, in female rats, NT is specifically localized in gonadotrophs or thyrotrophs. In addition, they strongly suggest that changes in circulating concentrations of ovarian steroids may control both NT synthesis in, and release from, these cells." @default.
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• W2161982920 date "2001-12-24" @default.
• W2161982920 modified "2023-10-13" @default.
• W2161982920 title "Immunoreactive Neurotensin in Gonadotrophs and Thyrotrophs is Regulated by Sex Steroid Hormones in the Female Rat" @default.
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• W2161982920 doi "https://doi.org/10.1046/j.1365-2826.1999.00393.x" @default.
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