Gonadotropin-releasing hormone-stimulated luteinizing hormone secretion by perifused pituitary cells from normal, gonadectomized, and testicular feminized rats. 1990

R J Krieg, and J M Batson, and P M Martha, and D W Matt, and R L Salisbury, and W S Evans
Department of Anatomy, Medical College of Virginia, Richmond 23298.

To elucidate further the manner in which gonadal steroids influence the secretion of LH, we examined the effects of gonadectomy and the absence of functional androgen receptors on GnRH-induced LH release from dispersed rat anterior pituitary cells. Intact and gonadectomized (GNX) normal rats and androgen-resistant, testicular feminized (Tfm) animals from the King x Holtzman strain (a mutant strain that possesses defective androgen receptors) were used. Dispersed pituitary cells were perifused with Medium 199 during a 4-h equilibration period and then subjected to eight 2.5-min pulses of GnRH introduced at 30-min intervals at concentrations ranging from 0.03-100 nM. Basal LH secretion by cells from intact male and female rats was indistinguishable (P = 0.79) and was substantially lower (P less than 0.0001) than that by cells from GNX male and female animals. Basal LH secretion by cells from Tfm rats was significantly higher (P less than 0.01) than that by cells from intact animals, but lower (P less than 0.005) than that by cells from GNX animals. In response to GnRH, perifused pituitary cells from animals representing all experimental groups demonstrated concentration-dependent LH release. Pituitary cells from intact female rats showed an overall greater (P less than 0.05) response to GnRH than cells from intact male rats. Pituitary cells from Tfm rats demonstrated a greater GnRH-stimulated LH mean response than cells from intact male (P less than 0.0001) or intact female (P less than 0.0001) rats. Gonadectomy of male rats resulted in an overall GnRH-stimulated LH release similar to that exhibited by cells from gonadectomized female rats (P = 0.61). Cells from Tfm animals released more LH in response to GnRH than those from gonadectomized male and female rats (P less than 0.001). These data demonstrate that the release of LH in response to GnRH by pituitary cells from intact male rats (i.e. in the presence of androgen and functional androgen receptors) is less than that seen by cells from intact females rats. Since circulating levels of testosterone and estradiol are known to be elevated in the testicular feminized rat, the heightened GnRH-stimulated LH release by cells from such animals may reflect either the long term lack of androgenic influence and/or the combined effects of androgen resistance and elevated levels of circulating estrogens.

UI MeSH Term Description Entries
D007986 Luteinizing Hormone A major gonadotropin secreted by the adenohypophysis (PITUITARY GLAND, ANTERIOR). Luteinizing hormone regulates steroid production by the interstitial cells of the TESTIS and the OVARY. The preovulatory LUTEINIZING HORMONE surge in females induces OVULATION, and subsequent LUTEINIZATION of the follicle. LUTEINIZING HORMONE consists of two noncovalently linked subunits, alpha and beta. Within a species, the alpha subunit is common in the three pituitary glycoprotein hormones (TSH, LH and FSH), but the beta subunit is unique and confers its biological specificity. ICSH (Interstitial Cell Stimulating Hormone),Interstitial Cell-Stimulating Hormone,LH (Luteinizing Hormone),Lutropin,Luteoziman,Luteozyman,Hormone, Interstitial Cell-Stimulating,Hormone, Luteinizing,Interstitial Cell Stimulating Hormone
D007987 Gonadotropin-Releasing Hormone A decapeptide that stimulates the synthesis and secretion of both pituitary gonadotropins, LUTEINIZING HORMONE and FOLLICLE STIMULATING HORMONE. GnRH is produced by neurons in the septum PREOPTIC AREA of the HYPOTHALAMUS and released into the pituitary portal blood, leading to stimulation of GONADOTROPHS in the ANTERIOR PITUITARY GLAND. FSH-Releasing Hormone,GnRH,Gonadoliberin,Gonadorelin,LH-FSH Releasing Hormone,LHRH,Luliberin,Luteinizing Hormone-Releasing Hormone,Cystorelin,Dirigestran,Factrel,Gn-RH,Gonadorelin Acetate,Gonadorelin Hydrochloride,Kryptocur,LFRH,LH-RH,LH-Releasing Hormone,LHFSH Releasing Hormone,LHFSHRH,FSH Releasing Hormone,Gonadotropin Releasing Hormone,LH FSH Releasing Hormone,LH Releasing Hormone,Luteinizing Hormone Releasing Hormone,Releasing Hormone, LHFSH
D008297 Male Males
D009919 Orchiectomy The surgical removal of one or both testicles. Castration, Male,Orchidectomy,Castrations, Male,Male Castration,Male Castrations,Orchidectomies,Orchiectomies
D010052 Ovariectomy The surgical removal of one or both ovaries. Castration, Female,Oophorectomy,Bilateral Ovariectomy,Bilateral Ovariectomies,Castrations, Female,Female Castration,Female Castrations,Oophorectomies,Ovariectomies,Ovariectomies, Bilateral,Ovariectomy, Bilateral
D010903 Pituitary Gland, Anterior The anterior glandular lobe of the pituitary gland, also known as the adenohypophysis. It secretes the ADENOHYPOPHYSEAL HORMONES that regulate vital functions such as GROWTH; METABOLISM; and REPRODUCTION. Adenohypophysis,Anterior Lobe of Pituitary,Anterior Pituitary Gland,Lobus Anterior,Pars Distalis of Pituitary,Adenohypophyses,Anterior Pituitary Glands,Anterior, Lobus,Anteriors, Lobus,Lobus Anteriors,Pituitary Anterior Lobe,Pituitary Glands, Anterior,Pituitary Pars Distalis
D002452 Cell Count The number of CELLS of a specific kind, usually measured per unit volume or area of sample. Cell Density,Cell Number,Cell Counts,Cell Densities,Cell Numbers,Count, Cell,Counts, Cell,Densities, Cell,Density, Cell,Number, Cell,Numbers, Cell
D005260 Female Females
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013734 Androgen-Insensitivity Syndrome A disorder of sexual development transmitted as an X-linked recessive trait. These patients have a karyotype of 46,XY with end-organ resistance to androgen due to mutations in the androgen receptor (RECEPTORS, ANDROGEN) gene. Severity of the defect in receptor quantity or quality correlates with their phenotypes. In these genetic males, the phenotypic spectrum ranges from those with normal female external genitalia, through those with genital ambiguity as in Reifenstein Syndrome, to that of a normal male with INFERTILITY. Testicular Feminization,AR Deficiency,Androgen Insensitivity Syndrome,Androgen Insensitivity, Partial,Androgen Receptor Deficiency,Androgen Resistance Syndrome,Androgen-Insensitivity Syndrome, Complete,Androgen-Insensitivity Syndrome, Partial,DHTR Deficiency,Dihydrotestosterone Receptor Deficiency,Male Pseudohermaphroditism Due to Androgen Insensitivity,Reifenstein Syndrome,Reifenstein's Syndrome,Testicular Feminization Syndrome,AR Deficiencies,Androgen Insensitivities, Partial,Androgen Insensitivity Syndrome, Complete,Androgen Insensitivity Syndrome, Partial,Androgen Insensitivity Syndromes,Androgen Receptor Deficiencies,Androgen Resistance Syndromes,Androgen-Insensitivity Syndromes,Androgen-Insensitivity Syndromes, Complete,Androgen-Insensitivity Syndromes, Partial,Complete Androgen-Insensitivity Syndrome,Complete Androgen-Insensitivity Syndromes,DHTR Deficiencies,Deficiencies, AR,Deficiencies, Androgen Receptor,Deficiencies, DHTR,Deficiencies, Dihydrotestosterone Receptor,Deficiency, AR,Deficiency, Androgen Receptor,Deficiency, DHTR,Deficiency, Dihydrotestosterone Receptor,Dihydrotestosterone Receptor Deficiencies,Feminization Syndrome, Testicular,Feminization Syndromes, Testicular,Feminization, Testicular,Feminizations, Testicular,Insensitivities, Partial Androgen,Insensitivity Syndrome, Androgen,Insensitivity Syndromes, Androgen,Insensitivity, Partial Androgen,Partial Androgen Insensitivities,Partial Androgen Insensitivity,Partial Androgen-Insensitivity Syndrome,Partial Androgen-Insensitivity Syndromes,Receptor Deficiencies, Androgen,Receptor Deficiencies, Dihydrotestosterone,Receptor Deficiency, Androgen,Receptor Deficiency, Dihydrotestosterone,Reifensteins Syndrome,Resistance Syndrome, Androgen,Resistance Syndromes, Androgen,Testicular Feminization Syndromes,Testicular Feminizations

Related Publications

R J Krieg, and J M Batson, and P M Martha, and D W Matt, and R L Salisbury, and W S Evans
May 1992, Endocrinology,
R J Krieg, and J M Batson, and P M Martha, and D W Matt, and R L Salisbury, and W S Evans
July 1991, Domestic animal endocrinology,
R J Krieg, and J M Batson, and P M Martha, and D W Matt, and R L Salisbury, and W S Evans
January 1990, Molecular and cellular endocrinology,
R J Krieg, and J M Batson, and P M Martha, and D W Matt, and R L Salisbury, and W S Evans
June 1988, The Journal of clinical investigation,
R J Krieg, and J M Batson, and P M Martha, and D W Matt, and R L Salisbury, and W S Evans
October 1986, Endocrinology,
R J Krieg, and J M Batson, and P M Martha, and D W Matt, and R L Salisbury, and W S Evans
April 1987, Endocrinology,
R J Krieg, and J M Batson, and P M Martha, and D W Matt, and R L Salisbury, and W S Evans
February 2003, Endocrinology,
Copied contents to your clipboard!