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However, systemic injection of this catecholamine was found consistently to reduce the increase in plasma LH and ovulation in the same animal model (4). We have recently demonstrated that ,8-adrenergic blockers inhibit gonadotropin release in orchidectomized rats (31). In this report, we present evidence that ,8- but not ar-adrenergic agonists stimulate LH secretion after their intravenous (iv) injection to orchidectomized rats. MATERIALS AND METHODS COMPONENT canbe shown in of some secreted proteins, such as salivary glycosidases (19) and circulating proteinases (17, Zl), and of certain viscerally produced hormones (7). Among anterior pituitary hormones, such a regulatory component is especially well documented for adrenocorticotropin (ACTH; 12, 27, 41), but it can also be shown for secretion of growth hormone (30) and prolactin (1). For pituitary gonadotropins, a direct of luteinizing hormone (LH) release by epinephrine was long under dispute (10, 37). In ovariectomized, estrogen-progesterone-blocked rats, surges of LH could be produced by somewhat high doses of epinephrine via systemic injection (34), or third ventricular infusion (15). In proestrous female rats blocked by phenobarbital, the third ventricular injection of epinephrine induces ovulation (35). APOSITIVE the output ,&ADRENERGIC E316 0193-1849/86 $1.50 Copyright Male Sprague-Dawley rats (280-300 g body weight; 22.5 mo
AJP - Endocrinology and Metabolism – The American Physiological Society
Published: Sep 1, 1986
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