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Histones synthesized at different stages of myogenesis are differentially degraded in myotube cells
Author(s) -
Wunsch Ann M.,
Lough John
Publication year - 1989
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.1041410115
Subject(s) - myogenesis , histone , microbiology and biotechnology , chemistry , biology , myocyte , biochemistry , dna
We recently reported that cultures of terminally differentiating myotube cells synthesize histones in reduced but significant amounts in comparison with proliferating myoblasts (Wunsch et al., 1987, Dev. Biol., 119 : 85–93). In this study, the stability of myotube histone has been determined, comparing the degradation of de novo–synthesized histones in nascent (day 3) and maturing (day 4) myotubes with histones in the same cells that had been previously made during myoblast proliferation (day 1). Histones synthesized in proliferating myoblasts and myotubes were pulse‐labeled with 3 H‐lysine and chased up to seven days, followed by determinations of radioactivity remaining in histone bands using fluorography of one‐ and two‐dimensional polyacrylamide gels. Considered in aggregate, core histones synthesized de novo in nascent (day 3) myotubes were degraded most rapidly, followed by myotube histones that had been previously made during the proliferative phase (day 1) of myogenesis. De novo–synthesized histones in maturing (day 4) myotubes were relatively stable. Individual histone classes were degraded in the following order of increasing half‐life, regardless of the differentiative stage at which they were synthesized: H2A.Z, H2A, H2B, H3(.2, day 1;.3, days 3 and 4), H4.