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Cell Growth & Differentiation, Vol 6, Issue 6 655-663, Copyright © 1995 by American Association of Cancer Research


ARTICLES

Growth inhibition and apoptosis of RL human B lymphoma cells by vitamin E succinate and retinoic acid: role for transforming growth factor beta

JM Turley, S Funakoshi, FW Ruscetti, J Kasper, WJ Murphy, DL Longo and MC Birchenall-Roberts
Laboratory of Leukocyte Biology, National Cancer Institute, Frederick, Maryland 21702, USA.

Vitamin E succinate (VES) and all-trans-retinoic acid (RA) were determined to be growth inhibitory for B lymphoma cells in vitro. RL, an Epstein-Barr virus-negative human cell line, was growth suppressed 87% with VES (5 micrograms/ml) and 58% with RA (10(-6) M); both agents blocked the cells in G1 of the cell cycle. The antiproliferative effect of VES seems to be independent of its potential antioxidant property because both fat- and water-soluble antioxidants were found to have no effect on RL cell proliferation. VES and RA increased IgM antibody concentrations in cell supernatants 5.8- and 9.9-fold, respectively. DNA fragmentation and flow cytometry studies showed VES- and RA-induced apoptosis in RL cells. VES- and RA-treated RL cells gradually underwent apoptosis over time with maximal induction occurring at days 6 and 5 of culture, respectively. A role for transforming growth factor beta in VES- and RA-mediated RL growth suppression is indicated by increased ligand and type II receptor protein expression. Furthermore, neutralizing antibodies to transforming growth factor beta 1 partially blocked the growth suppressive action of both VES and RA, thus suggesting that a TGF-beta autocrine negative loop was involved in VES and RA suppression of RL cell growth.


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Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1995 by the American Association of Cancer Research.