Regulation of GnRH receptors by progesterone and inhibin in ovine pituitary cell culture

Thesis/Dissertation · Fri Jan 01 00:00:00 EST 1988

OSTI ID:5517981

Laws, S C

The effects of progesterone (P{sub 4}) and the gonadal protein, inhibin, on gonadotropin-releasing hormone (GnRH) receptor number and binding affinity were investigated in vitro, using ovine pituitary cells in culture. Changes in GnRH binding were correlated with GnRH-stimulated luteinizing hormone (LH) release following pretreatment with P{sub 4} and inhibin. Ovine pituitary cells in culture were preincubated with P{sub 4} or porcine inhibin (I{sub P}) for 24 or 48 hours (h). Cells were collected and analyzed for GnRH binding using a radioligand-receptor assay. des-Gly{sup 10}-(D-Ala{sup 6})-LHRH-ethyl-amide was used as the radiolabeled GnRh superagonist analog (mono-{sup 125}I-GnRH-A) and as competing ligand. Treatment with P{sub 4} progressively decreased GnRH-A binding capacity by 44.3% and 71.8% of the control following pretreatment for 24 or 48 h, respectively. When P{sub 4} was removed from the cultures, GnRH-A binding capacity partially returned to control levels within 24 h. Decreased GnRH-A binding was closely correlated with the reduction in GnRH-stimulated LH release which was observed following 24 or 48 h pretreatment with P{sub 4}.

• Research Organization: North Carolina State Univ., Raleigh, NC (USA)
• OSTI ID: 5517981
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
GONADOTROPINS
RECEPTORS
PROGESTERONE
BIOCHEMICAL REACTION KINETICS
PROTEINS
CATTLE
CELL CULTURES
IODINE 125
PITUITARY GLAND
RADIORECEPTOR ASSAY
ANIMALS
BETA DECAY RADIOISOTOPES
BODY
DAYS LIVING RADIOISOTOPES
DOMESTIC ANIMALS
ELECTRON CAPTURE RADIOISOTOPES
ENDOCRINE GLANDS
GLANDS
HORMONES
INTERMEDIATE MASS NUCLEI
IODINE ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
KETONES
KINETICS
MAMMALS
MEMBRANE PROTEINS
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANS
PEPTIDE HORMONES
PITUITARY HORMONES
PREGNANES
RADIOISOTOPES
REACTION KINETICS
RUMINANTS
STEROID HORMONES
STEROIDS
TRACER TECHNIQUES
VERTEBRATES
550201* - Biochemistry- Tracer Techniques