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Cell Growth & Differentiation, Vol 8, Issue 2 121-131, Copyright © 1997 by American Association of Cancer Research


ARTICLES

Decreased immunoglobulin deposition in tumors and increased immature B cells in p53-null mice

L Shick, JH Carman, JK Choi, K Somasundaram, M Burrell, DE Hill, YX Zeng, Y Wang, KG Wiman, K Salhany, TR Kadesch, JG Monroe, LA Donehower and WS el-Deiry
Laboratory of Molecular Oncology and Cell Cycle Regulation, Howard Hughes Medical Institute, University of Pennsylvania School of Medicine, Philadelphia 19104, USA.

Recent studies have hinted that there may be a relationship between p53 and the immune response. In preliminary experiments, we found significantly decreased levels of immunoglobulin deposition in 13 of 16 p53-null tumors compared with 2 of 17 tumors derived from p53 +/- mice. We further explored the effect of p53 on B-cell development and function. p53-null mice contained more splenic white pulp and more immature B cells in the bone marrow compared with p53 +/- mice. p53-null B cells were hyperresponsive to proliferative challenge but were not more resistant to signal-induced apoptosis. Several p53 DNA-binding sites were localized to the regulatory regions of immunoglobulin heavy and light chain genes, including the KII site, which serves as an enhancer for rearrangement of the mouse kappa chain J cluster genes. Levels of p53 protein and the kappa chain sterile transcript increased after exposure of pre-B cells to the DNA damaging agents etoposide and Adriamycin. Our observations suggest that p53 may be involved in B-cell maturation and may relay certain stress signals to affect B-cell function.


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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 © 1997 by the American Association of Cancer Research.