The characteristics of luteinizing hormone and its beta-subunit secretion in dispersed rat anterior pituitary cells.
Secretion of luteinizing hormone (LH) and its beta-subunit (LH-beta) by luteinizing hormone-releasing hormone (LH-RH) were studied in perifused rat anterior pituitary cells. LH release was dose related between 10(-10) and 10(-6)M LH-RH. Every 5-minute pulse of 10(-8)M LH-RH induced almost similar response to the initial LH release; neither the self-priming effect nor desensitization were significant. Continuous administration of 10(-8)M LH-RH caused an initial LH release, followed by distinct desensitization, which could not be overcome by subsequent pulses of 10(-8)M LH-RH. The results were quite similar in LH-beta release. The perifusion study is shown to be useful in analyzing the characteristics of LH and LH-beta release, and the present results suggest that LH-RH receptor-mediated regulation may be also involved in LH-beta release.
Seki
T
T
Department of Obstetrics and Gynecology, School of Medicine, Keio University, Tokyo.
Makino
T
T
Tanimoto
S
S
Takahashi
M
M
Iida
T
T
Iizuka
R
R
D000818:Animals; D004305:Dose-Response Relationship, Drug; D007987:Gonadotropin-Releasing Hormone / Q000008:administration & dosage / Q000502:physiology*; D007986:Luteinizing Hormone / Q000378:metabolism*; D008297:Male; D010903:Pituitary Gland, Anterior / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains
D007987:Gonadotropin-Releasing Hormone; D007986:Luteinizing Hormone