Long-term effects of somatostatin 14 on the pituitary-ovarian axis in rats.
The long-term effects of somatostatin 14 (SST-14) on the pituitary-ovarian axis were examined. Female Wistar rats received 20 µg/100g b.w. doses subcutaneously twice daily for 5 consecutive days in the infantile (from 11th to 15th day) or peripubertal (from 33rd to 37th day) period of life. Females treated as infants were killed in the peripubertal (38th day) or adult period of life (80th day), and those treated during peripuberty as adults (80th day). Pituitary follicle-stimulating (FSH), luteinizing (LH) and somatotropic (GH) cells, and ovaries were analyzed by stereology and morphometry. Serum FSH and LH concentrations were determined by RIA. FSH and LH cell volumes were significantly decreased in pituitaries of peripubertal females treated with SST-14 as infants, and in adult females treated during peripuberty. GH cell volume was decreased in all treated rats. In the ovaries, enlargement of the non-growing pool of follicles was detected in adult females treated during peripuberty. SST-14 applied to infant rats did not lead to changes in initial follicular recruitment, but it disturbed follicle growth and development at later stages. It can be concluded that SST-14 exerted long-term inhibitory effects on the pituitary-ovarian axis and GH cells in rats.
Institute for Biological Research "Siniša Stanković", University of Belgrade, Belgrade, Serbia. rnata@ibiss.bg.ac.rs.
Nataša M
NM
Nestorović
Milica N
MN
Manojlović-Stojanoski
Svetlana L
SL
Trifunović
Nataša M
NM
Ristić
Branko R
BR
Filipović
Branka T
BT
Sošić-Jurjević
Verica Lj
VLj
Milošević
D000818:Animals; D001835:Body Weight / Q000187:drug effects; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood; D007986:Luteinizing Hormone / Q000097:blood; D009929:Organ Size / Q000187:drug effects; D006080:Ovarian Follicle / Q000187:drug effects / Q000254:growth & development; D010053:Ovary / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism / Q000502:physiology; D010902:Pituitary Gland / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D011247:Pregnancy; D051381:Rats; D017208:Rats, Wistar; D013004:Somatostatin / Q000494:pharmacology*; D013997:Time Factors
D013004:Somatostatin; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone