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Cell Growth & Differentiation, Vol 9, Issue 7 545-555, Copyright © 1998 by American Association of Cancer Research


ARTICLES

Differential subcellular p53 localization and function in N- and S-type neuroblastoma cell lines

JS Isaacs, R Hardman, TA Carman, JC Barrett and BE Weissman
UNC-Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill 27599, USA.

Neuroblastoma (NB) cells in vitro are capable of bidirectional transdifferentiation, resulting in two distinct, yet reversible, phenotypes of neuroblastic (N-type) and nonneuronal (S-type) Schwann-like cells. Our previous studies suggested that the wild-type p53 protein is subject to differential regulation in a subset of neuronal cell types. To further test this hypothesis, we compared p53 function in three matched pairs of N- and S-type cell lines, each pair originating from an individual NB tumor. Our data show that although p53 remains cytoplasmically sequestered in a punctate pattern in N-type cells after DNA damage, the protein is diffusely distributed in the S-type cells and is additionally capable of translocating to the nucleus and mediating a biological response to this damage. Our data, therefore, suggest that the p53 protein may be differentially regulated by a neuronal cellular environment and that the sequestration of p53 in NB may be reversible.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1998 by the American Association of Cancer Research.