Convergence of Wnt signaling and steroidogenic factor-1 (SF-1) on transcription of the rat inhibin alpha gene.
The action of a variety of peptide hormones is critical for proper growth and differentiation of the urogenital ridge, which ultimately gives rise to the kidney, adrenal cortex, and gonad. One such class of peptides is the Wnt family of secreted glycoproteins that is classically involved in development of cell polarity and cell fate determination. Notably, alterations in Wnt-4 expression in mice and humans result in profound defects in urogenital ridge development, including dysregulation of kidney, gonadal, and adrenal growth. The nuclear receptor steroidogenic factor-1 (SF-1) has been implicated as a downstream effector of peptide hormone signaling during urogenital ridge development as evidenced by both the activation of SF-1-dependent transcription in the adrenal cortex by signaling molecules such as protein kinase A and by the adrenal and gonadal agenesis in mice with null mutations in SF-1. We hypothesized that Wnt-dependent signaling cascades regulate SF-1-dependent transcription of genes required for adreno-gonadal development. Specifically, the data demonstrate that beta-catenin synergizes with SF-1 to activate the alpha-inhibin promoter through formation of a transcriptional complex. The activation requires an intact SF-1 RE and is independent of TCF/Lef. These data support the recent observation that beta-catenin can participate in nuclear receptor-mediated transcriptional activation and extend the findings to the monomer binding class of orphan nuclear receptors.
Department of Molecular and Integrative Physiology, Division of Endocrinology and Metabolism, University of Michigan, Ann Arbor, Michigan 48109, USA.
Brian M
BM
Gummow
Jonathon N
JN
Winnay
Gary D
GD
Hammer
D000302:Adrenal Cortex / Q000378:metabolism; D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D003598:Cytoskeletal Proteins / Q000378:metabolism; D018076:DNA, Complementary / Q000235:genetics; D004268:DNA-Binding Proteins / Q000378:metabolism*; D005260:Female; D051717:Fushi Tarazu Transcription Factors; D017930:Genes, Reporter; D018398:Homeodomain Proteins; D006801:Humans; D007265:Inhibins / Q000235:genetics*; D051821:Lymphoid Enhancer-Binding Factor 1; D008297:Male; D051379:Mice; D011401:Promoter Regions, Genetic; D011518:Proto-Oncogene Proteins / Q000378:metabolism*; D051381:Rats; D018160:Receptors, Cytoplasmic and Nuclear; D015398:Signal Transduction; D054339:Steroidogenic Factor 1; D015534:Trans-Activators / Q000378:metabolism; D014157:Transcription Factors / Q000378:metabolism*; D015533:Transcriptional Activation; D051153:Wnt Proteins; D060528:Wnt4 Protein; D029961:Zebrafish Proteins; D051176:beta Catenin
C495270:CTNNB1 protein, human; C495267:CTNNB1 protein, mouse; C495268:Ctnnb1 protein, rat; D003598:Cytoskeletal Proteins; D018076:DNA, Complementary; D004268:DNA-Binding Proteins; D051717:Fushi Tarazu Transcription Factors; D018398:Homeodomain Proteins; D051821:Lymphoid Enhancer-Binding Factor 1; C515057:NR5A1 protein, human; C515056:NR5A2 protein, zebrafish; D011518:Proto-Oncogene Proteins; D018160:Receptors, Cytoplasmic and Nuclear; D054339:Steroidogenic Factor 1; D015534:Trans-Activators; D014157:Transcription Factors; C555581:WNT4 protein, human; D051153:Wnt Proteins; D060528:Wnt4 Protein; C555582:Wnt4 protein, mouse; C555583:Wnt4 protein, rat; D029961:Zebrafish Proteins; D051176:beta Catenin; C094377:inhibin-alpha subunit; C515058:steroidogenic factor 1, mouse; C515060:steroidogenic factor 1, rat; D007265:Inhibins