NDLI: Lepidopteran DALP, and its mammalian ortholog HIC-5, function as negative regulators of muscle differentiation

Content Provider	PubMed Central
Author	Hu, Yanhui Cascone, Pamela J. Cheng, Lihong Sun, Danhui Nambu, John R. Schwartz, Lawrence M.
Copyright Year	1999
Abstract	During myogenesis, reductions in trophic factor availability signal most myoblasts to fuse, up-regulate the expression of muscle-specific genes, and form myotubes. Those cells failing to differentiate into myotubes initiate apoptosis and rapidly die. At present, the signal-transduction molecules that determine whether myoblasts should differentiate or die are largely unknown. In this report, we describe the cloning and characterization of DALP, a small LIM-only type zinc-finger protein that is induced when the intersegmental muscles (ISMs) of the moth Manduca sexta become committed to die at the end of metamorphosis. Forced expression of death-associated LIM-only protein (DALP) in Drosophila results in skeletal muscle atrophy. Ectopic expression of DALP, or its mammalian ortholog Hic-5, blocks differentiation and induces apoptosis in mouse C2C12 myoblasts. Both of these effects can be overcome by contact with normal myoblasts or by ectopic expression of the muscle-specific transcription factor MyoD. Hic-5 expression is specifically and dramatically induced in normal myoblasts that die after removal of trophic support. Taken together, these data suggest that DALP and Hic-5 act upstream of MyoD and function as phylogenetically conserved “switches” to block muscle differentiation and induce death.
Starting Page	10218
File Format	PDF
ISSN	10916490
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	18
Volume Number	96
Language	English
Publisher	The National Academy of Sciences
Publisher Date	1999-08-31
Access Restriction	Open
Rights Holder	The National Academy of Sciences
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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