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Myotonic dystrophy protein kinase (DMPK) induces actin cytoskeletal reorganization and apoptotic-like blebbing in lens cellsDMPK, the product of the DM locus, is a member of the same family of serine-threonine protein kinases as the Rho-associated enzymes. In DM, membrane inclusions accumulate in lens fiber cells producing cataracts. Overexpression of DMPK in cultured lens epithelial cells led to apoptotic-like blebbing of the plasma membrane and reorganization of the actin cytoskeleton. Enzymatically active DMPK was necessary for both effects; inactive mutant DMPK protein did not produce either effect. Active RhoA but not constitutive GDP-state mutant protein produced similar effects as DMPK. The similar actions of DMPK and RhoA suggest that they may function in the same regulatory network. The observed effects of DMPK may be relevant to the removal of membrane organelles during normal lens differentiation and the retention of intracellular membranes in DM lenses. Copyright 2000 Wiley-Liss, Inc.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Jin, S.
(Baylor College of Medicine Houston, Texas 77030, United States)
Shimizu, M.
Balasubramanyam, A.
Epstein, H. F.
Date Acquired
August 22, 2013
Publication Date
February 1, 2000
Publication Information
Publication: Cell motility and the cytoskeleton
Volume: 45
Issue: 2
ISSN: 0886-1544
Subject Category
Life Sciences (General)
Distribution Limits
Non-NASA Center
NASA Program Biomedical Research and Countermeasures
NASA Discipline Musculoskeletal

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