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Cell Growth & Differentiation, Vol 3, Issue 3 175-181, Copyright © 1992 by American Association of Cancer Research


ARTICLES

Anti-immunoglobulin treatment of murine B-cell lymphomas induces active transforming growth factor beta but pRB hypophosphorylation is transforming growth factor beta independent

GL Warner, JW Ludlow, DA Nelson, A Gaur and DW Scott
Division of Immunology and Immunotherapy, University of Rochester Cancer Center, New York 14642.

Cross-linking of B-cell membrane immunoglobulin (Ig) receptors induces growth arrest at G1-S, leading to apoptosis and cell death in the immature lymphomas WEHI-231 and CH31, but not in the CH12 B-cell line. In this system, which has been used as a model for B-cell tolerance, we have established that these lymphomas produce active transforming growth factor beta (TGF-beta) when treated with anti-Ig and that their hierarchy of sensitivity to TGF-beta generally correlates with their growth inhibition by anti-Ig. TGF-beta, in turn, has been shown to interfere with the phosphorylation of the retinoblastoma gene product, pRB. Herein, we also demonstrate that in WEHI-231 B-lymphoma cells treated with anti-Ig for 24 h, the pRB protein is found to be predominantly in the underphosphorylated form, as previously reported for cells arrested by the exogenous addition of TGF-beta. However, neutralizing antibodies to TGF-beta failed to prevent growth inhibition by anti-Ig in WEHI-231 and CH31. When WEHI-231 lymphoma cells were selected for growth in TGF-beta, the majority of the TGF-beta-resistant clones remained sensitive to anti-Ig-mediated growth inhibition. In these clones, the retinoblastoma gene product was found to be in the underphosphorylated form after 24-h treatment with anti-Ig, but not with TGF-beta. These data show that anti-Ig treatment of murine B-cell lymphomas stimulates the production of active TGF-beta but that a TGF-beta-independent pathway may be responsible for the pRB underphosphorylation and cell cycle blockade.


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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 © 1992 by the American Association of Cancer Research.