Sex steroid binding proteins in the plasma of the green frog, Rana esculenta: changes during the reproductive cycle and dependence on pituitary gland and gonads.
Gen Comp Endocrinol
; 96(3): 401-11, 1994 Dec.
Article
en En
| MEDLINE
| ID: mdl-7883147
ABSTRACT
Sex steroid binding proteins (SSBP) have been reported in the plasma of female and male Rana esculenta. In both sexes SSBP bind [3H]estradiol and [3H]testosterone with medium-high affinity and high specificity. Using ion-exchange chromatography SSBP resolve into two peaks eluting at 0.27 M (peak I) and 0.36 M (peak II) NaCl. Both peaks bind [3H]estradiol and [3H]testosterone equally well. Isoelectrofocusing showed that peak I focused at pH 6.0 and 7.5, whereas peak II focused at pH 6.0. SSBP capacity for [3H]estradiol and [3H]testosterone changes throughout the reproductive cycle, showing low levels during the nonbreeding period and increasing levels during the breeding period. Hypophysectomy and/or gonadectomy result in small changes in SSBP capacity. Short-term steroid hormone treatment of gonadectomized animals does not modify SSBP capacity.
Buscar en Google
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Ovario
/
Hipófisis
/
Rana esculenta
/
Maduración Sexual
/
Testículo
/
Globulina de Unión a Hormona Sexual
Límite:
Animals
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Gen Comp Endocrinol
Año:
1994
Tipo del documento:
Article
País de afiliación:
Italia