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Cell Growth & Differentiation, Vol 5, Issue 12 1403-1408, Copyright © 1994 by American Association of Cancer Research


ARTICLES

Role of calmodulin-dependent phosphorylation of elongation factor 2 in the proliferation of rat glial cells

DM Bagaglio and WN Hait
Department of Pharmacology, Cancer Institute of New Jersey, Robert Wood Johnson Medical School, Piscataway 08854-5638.

Calmodulin (CaM) is believed to play an important role in the regulation of cellular proliferation. The mechanism of regulation, although unknown, may involve CaM-binding proteins, particularly CaM-dependent protein kinases. Previously, we have shown that CaM-dependent protein kinase III phosphorylates elongation factor 2 (EF-2) in proliferating, C6 glioma cells but not in normal white matter, a tissue rich in nonproliferating glia. To determine whether CaM-dependent phosphorylation of EF-2 is linked, in general, to cellular division, we studied the phosphorylation of EF-2 in proliferating and growth-arrested C6 cells and in proliferating, primary cultures of normal glia. Phosphorylation of EF-2 was not detectable in C6 cells arrested in their growth by serum deprivation. When serum-deprived cells were stimulated to proliferate by the re-addition of serum, the amount of phosphorylated EF-2 correlated with levels of [3H]thymidine incorporation into DNA. Primary cultures of dividing, normal glia, obtained from neonatal rats, also demonstrated phosphorylation of EF-2. Therefore, the CaM-dependent phosphorylation of EF-2 appears to be associated with cellular proliferation in normal and malignant glia in the rat.


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Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1994 by the American Association of Cancer Research.