Development & stems cells
Retinoic acid signaling pathways driving stem spermatogonia ontogenesis and differentiation
Retinoic acid (RA), the biologically active metabolite of vitamin A, exerts a wide range of cellular effects by regulating proliferation, differentiation and apoptosis. At the cellular level, the action of RA is controlled through the modulated expression of cellular enzymes producing or degrading RA, retinaldehyde dehydrogenases (RALDH) or cytochrome P450 hydroxylases (CYP26), respectively. Then, acting in an hormone-like manner, RA binds to nuclear receptors (RAR) that function as transcriptional regulators through controlling, usually in the form of heterodimers with rexinoid receptors (RXR), the expression of RA target genes. Among the various tissues whose physiology depends upon vitamin A action, the seminiferous epithelium of the testis represents the most remarkable paradigm to investigate the pleiotropic effects of RA in vivo, as it integrates the problematic of stem cell renewal, cell proliferation, switching from mitotic to meiotic cell division, programmed cell death and paracrine signaling. Using a combination of innovative genetic, pharmacological and molecular approaches in the mouse, we are studying the cellular and molecular mechanisms that underlie the capabilities of RA to promote spermatogonia differentiation and beyond the differentiation of normal stem cells in vivo.
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News
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Publications
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Spermatogonia differentiation requires retinoic acid receptor .
Endocrinology Jan 2012 ; 153:438-49 .
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Development Jul 2011 ; 138:2661-72 .
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RA-RAR-beta counteracts myelin-dependent inhibition of neurite outgrowth via Lingo-1 repression
J Cell Biol June 27, 2011 ; 193:1147-56 .
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Cell Death Differ May 2011 ; 18:783-92 .
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Standardized Post-Mortem Examination and Fixation Procedures for Mutant and Treated Mice
Current Protocols in Mouse Biology 2011 ; 1:1-38 .
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Dev Biol Feb. 15, 2011 ; 350:548-58 .
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Proc Natl Acad Sci U S A May 17, 2011 ; 108:8212-7 .
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Environ Health Perspect Nov 2011 ; 119:1590-5 .
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Negative control of Smad activity by ectodermin/Tif1gamma patterns the mammalian embryo
Development Aug. 1, 2010 ; 137:2571-8 .
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Invest Ophthalmol Vis Sci Jun 2010 ; 51:3281-90 .
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