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Correlation of forkhead box transcription factor O1 and myosin heavy chain isoforms in porcine skeletal muscle

Author(s): X.E. Shi, Z.Y. Song, Q.M. Yang, Y.G. Liu and G.S. Yang

We examined the expression of myosin heavy chain (MyHC) isoforms and forkhead box transcription factor O1 (FoxO1) in porcine soleus and extensor digitorum longus (EDL) muscles to clarify the correlation of FoxO1 and the relative abundance of transcripts of MyHC isoforms. Soleus muscle was found to be redder than EDL muscles in pigs, and immunohistochemical fast MyHC staining showed more oxidative type I fibers compared to EDL. qRT-PCR quantifi cation of MyHC isoforms I, IIa, IIx, and IIb showed that expression of MyHC I and MyHC IIa mRNAs was much higher, whereas expression of MyHC IIx and MyHC IIb mRNAs was much lower in porcine soleus muscle compared to EDL muscle