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Journal Article
Research Support, Non-U.S. Gov't
Localization of Smad4 in the ovary of the European hedgehog (Erinaceus europaeus L.).
Acta Histochemica 2011 May
Ovarian follicular development, follicle selection, and the process of ovulation remain poorly understood in most species. Numerous endocrine, paracrine, and autocrine factors, including the ligands represented by the transforming growth factor β (TGFβ) superfamily, TGFβ, activin, inhibin, bone morphometric protein (BMP), and growth differentiation factor (GDF) are present in the ovaries of many animals. In the present study, we investigated the immunolocalization of Smad4, a signaling molecule of the TGFβ superfamily, during folliculogenesis in the ovary of the European hedgehog (Erinaceus europaeus L., 1758). Immunolocalization studies revealed that Smad4 was widely seen in the ovary, mainly in the follicle, though its location and staining intensity varied with the different stages of the developing follicle. In the primordial follicles and early growing follicles, Smad4 protein was mainly localized in the cytoplasm of the oocyte with a half-moon staining pattern. In the pre-antral follicles, Smad4 protein was mainly located in the granulosa cells, theca cells and diffusely distributed in the interstitial cells surrounding the follicle. In the corpora lutea, the immunostaining for Smad4 was very intense. These results suggested that Smad signal transduction may play an important role in folliculogenesis and conceivably may participate in subsequent pregnancy.
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