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Sex Differences and Estradiol Effects in MAPK and Akt Cell Signaling across Subregions of the Hippocampus.
Sheppard, Paul A S; Puri, Tanvi A; Galea, Liisa A M.
Afiliación
  • Sheppard PAS; Department of Psychology, University of British Columbia, Vancouver, British Columbia, Canada.
  • Puri TA; Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, British Columbia, Canada.
  • Galea LAM; Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, British Columbia, Canada.
Neuroendocrinology ; 112(7): 621-635, 2022.
Article en En | MEDLINE | ID: mdl-34407537
INTRODUCTION: Rapid effects of estrogens within the hippocampus of rodents are dependent upon cell-signaling cascades, and activation of these cascades by estrogens varies by sex. Whether these pathways are rapidly activated within the dentate gyrus (DG) and CA1 by estrogens across sex and the anatomical longitudinal axis has been overlooked. METHODS: Gonadally intact female and male rats were given either vehicle or physiological systemic low (1.1 µg/kg) or high (37.3 µg/kg) doses of 17ß-estradiol 30 min prior to tissue collection. To control for the effects of circulating estrogens, an additional group of female rats was ovariectomized (OVX) and administered 17ß-estradiol. Brains were extracted, and tissue punches of the CA1 and DG were taken along the longitudinal hippocampal axis (dorsal and ventral) and analyzed for key mitogen-activated protein kinase (MAPK) and protein kinase B (Akt) cascade phosphoproteins. RESULTS: Intact females had higher Akt pathway phosphoproteins (pAkt, pGSK-3ß, and pp70S6K) than males in the DG (dorsal and ventral) and lower pERK1/2 in the dorsal DG. Most effects of 17ß-estradiol on cell signaling occurred in OVX animals. In OVX animals, 17ß-estradiol increased cell signaling of MAPK and Akt phosphoproteins (pERK1/2, pJNK, pAkt, and pGSK-3ß) in the CA1 and pERK1/2 and pJNK DG. DISCUSSION/CONCLUSIONS: Systemic 17ß-estradiol treatment rapidly alters phosphoprotein levels in the hippocampus, dependent on reproductive status, and intact females have greater expression of Akt phosphoproteins than that in intact males in the DG. These findings shed light on underlying mechanisms of sex differences in hippocampal function and response to interventions that affect MAPK or Akt signaling.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Transducción de Señal / Caracteres Sexuales / Estradiol / Hipocampo Límite: Animals Idioma: En Revista: Neuroendocrinology Año: 2022 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Suiza
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Transducción de Señal / Caracteres Sexuales / Estradiol / Hipocampo Límite: Animals Idioma: En Revista: Neuroendocrinology Año: 2022 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Suiza