Evidence for three adult fast myosin heavy chain isoforms in type II skeletal muscle fibers in pigs

Journal of Animal Science
L LefaucheurA Kelly

Abstract

Three main fiber types (one slow [type I] and two fast [type IIA and IIB] can be distinguished using conventional actomyosin ATPase (AM-ATPase) histochemistry after acidic pretreatment in mature pig skeletal muscle. We report the isolation, characterization, and identification of four adult 3'-untranslated regions corresponding to types I, IIA, IIB, and IIX myosin heavy chains (MyHC) from a cDNA library. Identification of different type II clones was based on sequence homology, in situ hybridizations (ISH), AM-ATPase histochemistry, and immunocytochemistry. Enzyme histochemistry, immunocytochemistry, and ISH were performed on serial transverse sections of longissimus and red portion of semitendinosus muscle. Results showed that all three fast MyHC transcripts were expressed in the longissimus, whereas only type IIA and IIX transcripts were present in deep red semitendinosus muscle. Type I and IIA fibers contained mostly type I and IIA transcripts, respectively, whereas type IIB fibers contained a heterogeneous population of transcripts. In longissimus muscle, 18, 31, and 51% of conventional IIB fibers were pure IIX, hybrid IIX/IIB, and pure IIB fibers, respectively. Conversely, conventional IIB fibers were actually IIX in deep ...Continue Reading

Citations

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