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TL;DR
The central result was that PA treatment suppressed the mRNA and protein expression of MHC IIb, a predominant fast-twitch fiber isoform, by inhibiting the transcriptional activity of the myogenic regulatory factor MyoD.
International Journal of Molecular Sciences · 3 authors, 2 centres
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The central result was that PA treatment suppressed the mRNA and protein expression of MHC IIb, a predominant fast-twitch fiber isoform, by inhibiting the transcriptional activity of the myogenic regulatory factor MyoD.
The central result was that PA treatment suppressed the mRNA and protein expression of MHC IIb, a predominant fast-twitch fiber isoform, by inhibiting the transcriptional activity of the myogenic regulatory factor MyoD. The authors propose that PA leads to MyoD phosphorylation, likely via a diacylglycerol-activated protein kinase C (PKC), which inactivates MyoD and reduces its ability to drive *Myh4* (the gene for MHC IIb) transcription. The study employed specific inhibitors (TAK-242, Ro 31-8220) and MyoD phosphorylation-site mutants to probe the signaling pathway. The findings suggest a potential cellular mechanism linking lipotoxicity to the selective loss of fast-twitch muscle fibers observed in sarcopenia.