Melatonin decreases estrogen receptor expression in the medial preoptic area of inbred (LSH/SsLak) golden hamsters.
Daily late afternoon injections of melatonin (25 micrograms/day s.c.) were found to reduce the number of cells expressing estrogen receptor immunoreactivity in the medial preoptic area of ovariectomized inbred (LSH/SsLak) golden hamsters. Employing immunocytochemical analysis with the H222 monoclonal antibody to the human estrogen receptor, we examined the effects of melatonin on estrogen receptor expression in the hypothalamus, particularly the medial preoptic area, of ovariectomized virgin female hamsters. Analysis of the results showed that melatonin administration induced a 50-70% decrease in numbers of estrogen receptor-immunoreactive neurons in the medial preoptic area of ovariectomized female hamsters. Furthermore, an overall qualitative decrease in the intensity of estrogen receptor immunoreactivity was observed. In intact regularly cycling female hamsters used to monitor the efficacy of melatonin treatment, there were significant reductions in the serum levels of FSH, LH, and prolactin as measured by radioimmunoassay and in uterine and pituitary weights after 8 wk of melatonin treatment. These results suggest that melatonin may exert its anti-reproductive effects in hamsters by modulating estrogen receptor levels in medial preoptic area neurons, thus influencing steroid feedback mechanisms.
Lawson
N O
NO
Department of Anatomy, Tulane University School of Medicine, New Orleans, Louisiana 70112.
Wee
B E
BE
Blask
D E
DE
Castles
C G
CG
Spriggs
L L
LL
Hill
S M
SM
D000818:Animals; D006224:Cricetinae; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood; D007150:Immunohistochemistry; D007986:Luteinizing Hormone / Q000097:blood; D008550:Melatonin / Q000494:pharmacology*; D009929:Organ Size / Q000187:drug effects; D010052:Ovariectomy; D010902:Pituitary Gland / Q000033:anatomy & histology / Q000378:metabolism; D011301:Preoptic Area / Q000187:drug effects / Q000378:metabolism*; D011388:Prolactin / Q000097:blood; D011863:Radioimmunoassay; D011960:Receptors, Estrogen / Q000096:biosynthesis*; D014599:Uterus / Q000033:anatomy & histology / Q000378:metabolism
D011960:Receptors, Estrogen; D011388:Prolactin; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D008550:Melatonin