Transition of myosin isozymes during development of human masseter muscle. Persistence of developmental isoforms during postnatal stage.

摘要: Previous results have shown that the adult human masseter muscle contains myosin isoforms are specific to early stages of development in trunk and limb muscles, i.e. embryonic fetal (neonatal) heavy chains (MHC) light chain (MLC1emb). We wanted know if this pattern is result a late maturation or distinct evolution during development. show here MHC MLC1emb expressed throughout perinatal postnatal Our also demonstrate accumulation increases considerably period. In addition, both slow MLCs isoform tropomyosin later than quadriceps fast skeletal MLC3 not detected whereas it quadriceps. thus confirm previous histochemical data displays transitions different previously described muscles. This suggests control involves mechanisms from other body possibly as either its craniofacial innervation origin.