Expression of wild-type p53 and Bcl-2 family genes oscillates with recurrent remission and relapse in an unusual case of low-grade lymphoma.

Abstract:

:Downregulation of apoptosis has been proposed as a mechanism of clonal expansion in low-grade B cell neoplasms. We have previously described an unusual case of CD5+ B cell lymphoma characterized by cycles of leukemic phase alternating with spontaneous remission. In the present study, we examined the involvement of apoptosis-related proteins in the progression of this cyclic lymphoma ex vivo. During the leukemic phases, the clonal cells were activated blasts expressing elevated levels of wild-type (wt) p53, Bcl-2, Bcl-x(L), and Bax, while Bak expression increased during the decline of lymphocytosis. Bax heterodimerized with Bcl-2 but not with Bcl-x(L). The anti-apoptotic Bcl-2/Bax heterodimers peaked during early leukemic phases and declined during regression. The elevation in Bcl-2, Bcl-x(L) and Bax expression during early leukemic phases seems to result from cell activation since a similar increase was induced by activating the remission phase leukemic cells in culture. The data suggest that wt p53, Bcl-x(L), and Bcl-2/Bax heterodimers support the accumulation of activated leukemic cells during the leukemic phases, while Bax and Bak may be involved in their decline during regression.

journal_name

Acta Haematol

journal_title

Acta haematologica

authors

Aizman I,Many A,Peller S,Ramot B,Kaufmann Y

doi

10.1159/000041046

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

177-85

issue

4

eissn

0001-5792

issn

1421-9662

pii

41046

journal_volume

103

pub_type

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