Distinctive expression of Myf5 in relation to differentiation and plasticity of newt muscle cells.
Regeneration in urodele amphibians such as the newt reflects the local plasticity of differentiated cells. Newt myotubes and myofibres undergo S phase re-entry and cellularisation in the limb blastema, and we have analysed the regulation of Myf5 in relation to these events. Surprisingly, Myf5 was expressed after fusion in cultured newt myotubes and in myofibers of the adult limb, in contrast to its familiar expression in myoblasts in other vertebrates. Its expression was markedly down regulated in cultured newt myotubes after S phase re-entry induced by serum stimulation, as well as by exposure to the trisubstituted purine called myoseverin which induces cellularisation. We have attempted to relate this striking difference from other vertebrates to the requirement for multinucleate urodele muscle cells to contribute to the regeneration blastema.
Department of Biochemistry & Molecular Biology, University College London, London, U.K.
Yutaka
Y
Imokawa
Phillip B
PB
Gates
Young-Tae
YT
Chang
Hans-Georg
HG
Simon
Jeremy P
JP
Brockes
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002454:Cell Differentiation; D004247:DNA / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000502:physiology*; D005121:Extremities / Q000254:growth & development / Q000502:physiology; D018507:Gene Expression Regulation, Developmental; D008969:Molecular Sequence Data; D018485:Muscle Fibers, Skeletal / Q000166:cytology / Q000502:physiology; D009124:Muscle Proteins / Q000235:genetics* / Q000502:physiology*; D032448:Myoblasts, Skeletal / Q000166:cytology* / Q000502:physiology; D051787:Myogenic Regulatory Factor 5; D009673:Notophthalmus viridescens / Q000235:genetics* / Q000254:growth & development / Q000502:physiology*; D012038:Regeneration / Q000235:genetics* / Q000502:physiology*; D016196:S Phase; D017386:Sequence Homology, Amino Acid; D015534:Trans-Activators / Q000235:genetics* / Q000502:physiology*
D004268:DNA-Binding Proteins; D009124:Muscle Proteins; D051787:Myogenic Regulatory Factor 5; D015534:Trans-Activators; D004247:DNA