The Journal of Experimental Medicine
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© The Rockefeller University Press, 0022-1007/1998/5/1671/ $5.00
The Journal of Experimental Medicine, Volume 187, Number 10, May 18, 1998 1671-1679

Articles

Roles of the Tumor Suppressor p53 and the Cyclin-dependent Kinase Inhibitor p21WAF1/CIP1 in Receptor-mediated Apoptosis of WEHI 231 B Lymphoma Cells

Min Wu*, Robert E. Bellas*, Jian Shen{ddagger}, and Gail E. Sonenshein*

From the * Department of Biochemistry and the {ddagger} Department of Pathology and Laboratory Medicine, Boston University School of Medicine, Boston, Massachusetts 02118

Treatment of WEHI 231 immature B lymphoma cells with an antibody against their surface immunoglobulin M (anti-IgM) induces apoptosis and has been studied extensively as a model of self-induced B cell tolerance. Since the tumor suppressor protein p53 has been implicated in apoptosis in a large number of cell types and has been found to be mutated in a variety of B cell tumors, here we sought to determine whether p53 and the p53 target gene cyclin-dependent kinase inhibitor p21WAF1/CIP1 were involved in anti-IgM–induced cell death. Anti-IgM treatment of WEHI 231 cells increased expression of p53 and p21 protein levels. Ectopic expression of wild-type p53 in WEHI 231 cells induced both p21 expression and apoptosis. Ectopic expression of p21 similarly induced apoptosis. Rescue of WEHI 231 cells from apoptosis by costimulation with CD40 ligand ablated the increase in p21 expression. Lastly, a significant decrease in anti-IgM–mediated apoptosis was seen upon downregulation of endogenous p53 activity by expression of a dominant-negative p53 protein or upon microinjection of an antisense p21 expression vector or antibody. Taken together, the above data demonstrate important roles for p53 and p21 proteins in receptor-mediated apoptosis of WEHI 231 B cells.

Key Words: p53 tumor suppressor • p21WAF1/CIP1 • apoptosis • WEHI 231 B-lymphocytes • CD40 ligand

Address correspondence to Gail E. Sonenshein, Department of Biochemistry, Boston University School of Medicine, 80 East Concord St., Boston, MA 02118. Phone: 617-638-4120; Fax: 617-638-4252; E-mail: gsonensh{at}acs.bu.edu

Min Wu and Robert E. Bellas contributed equally to this work.

Abbreviations used: CAT, chloramphenicol acetyl transferase; CD40L, CD40 ligand; CDK, cyclin-dependent kinase; FBS, fetal bovine serum; IPTG, isopropyl-β-D-thiogalacto-pyranoside; NF, nuclear factor; RSV-LTR, Rous Sarcoma Virus–long terminal repeat.


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