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High mobility group box 2 regulates skeletal muscle development through ribosomal protein S6 kinase 1.

FASEB J. 2020 Sep;34(9):12367-12378. doi:10.1096/fj.202001183R. Epub 2020 Jul 20
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摘要


HMGB2, a DNA-binding protein, highly expresses during embryogenesis and plays an important role in development of some organs and tissues. However, it remains to be further investigated weather HMGB2 influences muscle development. In this work, we identified HMGB2 as an essential factor in myogenesis. Compared to wild type (WT) mice, body weights of systemic hmgb2 homozygous knockout (hmgb2-/- ) mice especially males were reduced. Diameter and cross-section area of tibialis anterior (TA) muscle fibers as well as expression of Myogenin and MyHC were all decreased in hmgb2-/- mice. CTX injury model revealed that HMGB2 was required for satellite cell proliferation and muscle regeneration. Moreover, HMGB2 interacted with S6K1 and regulated the kinase activity of S6K1 during cell proliferation. Knockdown and inactivation of S6K1 in C2C12 cells both resulted in impaired proliferation and differentiation. Furthermore, expression of cyclin D1 and Myf5 were both decreased when HMGB2 or S6K1 were knocked down and kinase activity of S6K1 was inhibited. These results indicate that HMGB2 is required for skeletal muscle development and regeneration, and HMGB2 maintains proliferation of myoblasts through regulating kinase activity of S6K1.

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