Article

Mullerian inhibiting substance regulates its receptor/SMAD signaling and causes mesenchymal transition of the coelomic epithelial cells early in Mullerian duct regression

Harvard University, Cambridge, Massachusetts, United States
Development (Impact Factor: 6.27). 07/2006; 133(12):2359-69. DOI: 10.1242/dev.02383
Source: PubMed

ABSTRACT Examination of Müllerian inhibiting substance (MIS) signaling in the rat in vivo and in vitro revealed novel developmental stage- and tissue-specific events that contributed to a window of MIS responsiveness in Müllerian duct regression. The MIS type II receptor (MISRII)-expressing cells are initially present in the coelomic epithelium of both male and female urogenital ridges, and then migrate into the mesenchyme surrounding the male Müllerian duct under the influence of MIS. Expression of the genes encoding MIS type I receptors, Alk2 and Alk3, is also spatiotemporally controlled; Alk2 expression appears earlier and increases predominantly in the coelomic epithelium, whereas Alk3 expression appears later and is restricted to the mesenchyme, suggesting sequential roles in Müllerian duct regression. MIS induces expression of Alk2, Alk3 and Smad8, but downregulates Smad5 in the urogenital ridge. Alk2-specific small interfering RNA (siRNA) blocks both the transition of MISRII expression from the coelomic epithelium to the mesenchyme and Müllerian duct regression in organ culture. Müllerian duct regression can also be inhibited or accelerated by siRNA targeting Smad8 and Smad5, respectively. Thus, the early action of MIS is to initiate an epithelial-to-mesenchymal transition of MISRII-expressing cells and to specify the components of the receptor/SMAD signaling pathway by differentially regulating their expression.

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    • "The development of the M€ ullerian ducts occurs in three phases (Orvis and Behringer, 2007). Initially, there is a placode-like thickening of the coelomic epithelium, characterized by the expression of LIM1 and anti-M€ ullerian hormone receptor type II (AMHR-II) (Zhan et al., 2006; Arango et al., 2008). In the second phase, these primordial M€ ullerian cells invaginate from the coelomic epithelium to reach the Wolffian duct, induced by WNT4 expression from the mesonephros or coelomic epithelium (Vainio et al., 1999; Kobayashi et al., 2004). "
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    • "Since cumulus cells continue to proliferate at later stages of folliculogenesis, but mural cells do not (Hirshfield, 1986), FOXL2 may be involved in shaping and establishment of the different granulosa phenotypes that comprise the follicle during development. The differentiation-promoting activity of MIS is demonstrated in the mammalian model by the epithelial–mesenchymal transition that occurs during Müllerian duct regression in sexually differentiating males (Zhan et al., 2006). In medaka, the expression of mis has been associated with somatic cells that surround the primordial germ cells (PGCs) of both sexes starting approximately four days before proliferative activity (Shiraishi et al., 2008). "
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