Artículo
Cooperative effect of E2 and FGF2 on lactotroph proliferation triggered by signaling initiated at the plasma membrane
Sosa, Liliana del Valle
; Gutiérrez, Silvina
; Petiti, Juan Pablo
; Vaca, Alicia Maldré del Valle
; de Paul, Ana Lucia
; Torres, Alicia Ines
Fecha de publicación:
04/2013
Editorial:
American Physiological Society
Revista:
American Journal Of Physiology-endocrinology And Metabolism
ISSN:
0193-1849
e-ISSN:
1522-1555
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
In the present work, we investigated the effect of 17β-estradiol (E2) and basic fibroblast growth factor 2 (FGF2) on the lactotroph cell-proliferative response and the related membrane-initiated signaling pathway. Anterior pituitary mixed-cell cultures of random, cycling 3-mo-old female rats were treated with 10 nM E2, E2 membrane-impermeable conjugated BSA (E2-BSA), PPT (ERα agonist), and DPN (ERβ agonist) alone or combined with FGF2 (10 ng/ml) for 30 min or 4 h. Although our results showed that the uptake of BrdU into the nucleus of lactotrophs was not modified by E2 or FGF2 alone, a significant increase in the lactotroph uptake of BrdU was observed after E2/FGF2 coincubation, with this effect being mimicked by PPT/FGF2. These proliferative effects were blocked by ICI 182,780 or PD-98059. The involvement of membrane ER in the proliferative response of prolactin cells induced by the steroid and FGF2 coincubation was confirmed using E2-BSA, and the association between ERα and FGF receptor was observed after E2/FGF2 treatment by immunoprecipitation. A significant increase in the ERK1/2 expression was noted after E2, E2-BSA, PPT, and FGF2 alone, which was more noticeable after E2-BSA/FGF2, E2/FGF2, or PPT/FGF2 treatments. This study provides evidence that E2 and FGF2 exert a cooperative effect on the lactotroph proliferation principally by signaling initiated at the plasma membrane triggering a genomic effect mediated by MEK/ERK1/2, a common signaling pathway, that finally regulates the lactotroph population, thus contributing to pituitary plasticity.
Palabras clave:
17beta-Estradiol
,
Membrane Re
,
Fgf2
,
Lactotroph Cells
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Identificadores
Colecciones
Articulos(CCT - CORDOBA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Articulos(INICSA)
Articulos de INSTITUTO DE INVESTIGACIONES EN CIENCIAS DE LA SALUD
Articulos de INSTITUTO DE INVESTIGACIONES EN CIENCIAS DE LA SALUD
Citación
Sosa, Liliana del Valle; Gutiérrez, Silvina; Petiti, Juan Pablo; Vaca, Alicia Maldré del Valle; de Paul, Ana Lucia; et al.; Cooperative effect of E2 and FGF2 on lactotroph proliferation triggered by signaling initiated at the plasma membrane; American Physiological Society; American Journal Of Physiology-endocrinology And Metabolism; 305; 1; 4-2013; 45-49
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