TNF/p38α/polycomb signaling to Pax7 locus in satellite cells links inflammation to the epigenetic control of muscle regeneration.

TNF/p38α/polycomb signaling to Pax7 locus in satellite cells links inflammation to the epigenetic control of muscle regeneration.
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DOI:
10.1016/j.stem.2010.08.013
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发表时间:
2010-10-08
期刊:
影响因子:
23.9
通讯作者:
Puri, Pier Lorenzo
Puri, Pier Lorenzo
中科院分区:
医学1区
文献类型:
--
作者:
Palacios, Daniela;Mozzetta, Chiara;Consalvi, Silvia;Caretti, Giuseppina;Saccone, Valentina;Proserpio, Valentina;Marquez, Victor E.;Valente, Sergio;Mai, Antonello;Forcales, Sonia V.;Sartorelli, Vittorio;Puri, Pier Lorenzo

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How regeneration cues are converted into the epigenetic information that controls gene expression in adult stem cells is currently unknown. We identified a novel inflammation-activated signalling in muscle stem (satellite) cells, by which the Polycomb Repressive Complex 2 (PRC2) represses Pax7 expression during muscle regeneration. TNF-activated p38alpha kinase promotes the interaction between YY1 and PRC2, via threonine 372 phosphorylation of EzH2, the enzymatic sub-unit of the complex, leading to the formation of repressive chromatin on Pax7 promoter. Anti-TNF antibodies stimulate satellite cell proliferation in regenerating muscles of dystrophic or normal mice. Genetic knockdown or pharmacological inhibition of the enzymatic components of the p38/PRC2 signalling – p38alpha and EzH2 - invariably promote Pax7 expression and expansion of satellite cells that retain their differentiation potential upon signalling resumption. Genetic knockdown of Pax7 impaired satellite cell proliferation in response to p38 inhibition, thereby establishing the biological link between p38/PRC2 signalling to Pax7 and satellite cell decision to proliferate or differentiate.
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