Estrogen alters the effects of neuropeptide-Y on luteinizing hormone and follicle-stimulating hormone release in female rats at the level of the anterior pituitary gland.

Endocrinology ◽  
1993 ◽  
Vol 133 (6) ◽  
pp. 2675-2681 ◽  
Author(s):  
M J Woller ◽  
G T Campbell ◽  
L Liu ◽  
R W Steigerwalt ◽  
C A Blake
Keyword(s):  
Luteinizing Hormone ◽  
Pituitary Gland ◽  
Neuropeptide Y ◽  
Anterior Pituitary ◽  
Follicle Stimulating Hormone ◽  
Anterior Pituitary Gland ◽  
Female Rats ◽  
Hormone Release ◽  
Stimulating Hormone

Effect of Starvation on Pituitary and Serum Follicle-Stimulating Hormone and Luteinizing Hormone Following Ovariectomy in the Rat

1972 ◽  
Vol 50 (8) ◽  
pp. 768-773 ◽  
Author(s):  
E. A. Ibrahim ◽  
B. E. Howland
Keyword(s):  
Luteinizing Hormone ◽  
Pituitary Gland ◽  
Follicle Stimulating Hormone ◽  
Female Rats ◽  
Intact Female ◽  
Pituitary Glands ◽  
Ad Libitum ◽  
Stimulating Hormone

The concentration of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) in serum and pituitary glands was studied in intact female rats and rats that were ovariectomized on day 0 of the experiment and then starved or fed for 2, 4, 7, or 9 days. Ovariectomy resulted in enhanced rates of synthesis and release of FSH and LH as indicated by the significant (P < 0.01) rises in the concentration of both hormones in the pituitary gland and serum.Starvation resulted in a decrease in body and pituitary weight. The concentration of FSH and LH in pituitary glands of starved rats was higher (P < 0.05) than that in fed rats on days 7 and 9. The concentration of FSH and LH in serum of starved rats was increased after ovariectomy but the levels on days 7 and 9 were lower than those of fed rats.These results suggest that the synthesis of FSH and LH was enhanced in both starved and fed rats following ovariectomy while the rate of release of both hormones was decreased at 7 and 9 days of starvation in comparison with rats fed ad libitum.

EFFECT OF INTRAVENOUS INFUSION OF A STEROID ANAESTHETIC ON THE PREOVULATORY SURGE OF LUTEINIZING HORMONE AND OVULATION IN INTACT RATS

1978 ◽  
Vol 76 (2) ◽  
pp. 361-362 ◽  
Author(s):  
J. RABII ◽  
D. K. CLIFTON ◽  
C. H. SAWYER
Keyword(s):  
Los Angeles ◽  
Luteinizing Hormone ◽  
Pituitary Gland ◽  
Anterior Pituitary ◽  
Critical Period ◽  
Brain Research ◽  
Anterior Pituitary Gland ◽  
Female Rats ◽  
School Of Medicine ◽  
Intact Rats

Department of Anatomy and Brain Research Institute, UCLA School of Medicine, Los Angeles, California 90024, U.S.A. (Received 21 July 1977) The existence of a 'critical period' in the ovulatory surge of pituitary gonadotrophin during the afternoon of pro-oestrus was demonstrated by Everett, Sawyer & Markee (1949). It was assumed that during this period, between 14.00 and 16.00 h, an amount of gonadotrophin sufficient to cause ovulation was released from the anterior pituitary gland. Administration of a number of neuropharmacologically active drugs before or during the 'critical period' was shown to inhibit the ovulatory response (Everett, 1961). Recently, Blake (1974) described the existence of an 'activation period' as well as a 'potential activation period' for the preovulatory release of luteinizing hormone (LH) in female rats. The 'activation period' is an extended 'critical period', from 14.00 to 17.00 h, during which time a neurohumoral signal continues to stimulate the anterior pituitary gland

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