title: Characterization of heterokaryons between skeletal myoblasts and preadipocytes: myogenic potential of 3T3-L1 preadipocytes.
abstract: It has been shown previously that heterokaryons between myoblasts and non-myogenic cells disturb myogenic differentiation (Hirayama et al. (2001); Cell Struct. Funct. 26, 37-47), suggesting that some myogenesis inhibitory factors exist in non-myogenic cells. Skeletal myoblasts and adipose cells are derived from a common mesodermal stem cell, indicating that both cells have a closer relationship in the developmental lineage than the other somatic cells. To investigate the functional relationship between myoblasts and adipose cells, heterokaryons between quail myoblasts and 3T3-L1 cells, a mouse preadipocyte cell line, were prepared and examined for characteristics of myogenic differentiation. Myogenic differentiation was inhibited in the heterokaryons between quail myoblasts and well-differentiated (adipocytes) 3T3-L1 cells. On the contrary, normal myogenic differentiation proceeded in the heterokaryons between quail myoblasts and undifferentiated (preadipocytes) 3T3-L1 cells. Further investigation showed that the mouse myogenin gene from 3T3-L1 cells was transactivated in the heterokaryons between quail myoblasts and undifferentiated 3T3-L1 cells. The results demonstrated that undifferentiated 3T3-L1 cells have no myogenesis inhibitory factors but acquire these during terminal differentiation into adipocytes.
authors.affiliation: Institute of Molecular and Cellular Biology for Pharmaceutical Sciences, Kyoto Pharmaceutical University, Misasagi, Kyoto, Japan.
authors.forename: Nagako
authors.initials: N
authors.lastname: Sasao
authors.forename: Etsuko
authors.initials: E
authors.lastname: Hirayama
authors.forename: Jeman
authors.initials: J
authors.lastname: Kim
mesh_terms: D016475:3T3 Cells; D017667:Adipocytes / Q000166:cytology* / Q000378:metabolism; D000818:Animals; D001358:Avian Sarcoma Viruses / Q000502:physiology; D015152:Blotting, Northern; D002454:Cell Differentiation / Q000235:genetics / Q000502:physiology; D002459:Cell Fusion; D002461:Cell Line, Transformed; D015870:Gene Expression; D006822:Hybrid Cells / Q000166:cytology / Q000378:metabolism; D051379:Mice; D018485:Muscle Fibers, Skeletal / Q000166:cytology / Q000378:metabolism; D032448:Myoblasts, Skeletal / Q000166:cytology* / Q000378:metabolism; D018008:Myogenin / Q000235:genetics; D011784:Quail; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism
chemical_list: C503801:Myog protein, mouse; D018008:Myogenin; D012333:RNA, Messenger