Survival of leukemic B cells promoted by engagement of the antigen receptor.

Abstract:

:Chronic lymphocytic leukemia (CLL) is an incurable leukemia characterized by the slow but progressive accumulation of cells in a CD5+ B-cell clone. Like the nonmalignant counterparts, B-1 cells, CLL cells often express surface immunoglobulin with the capacity to bind autologous structures. Previously there has been no established link between antigen-receptor binding and inhibition of apoptosis in CLL. In this work, using primary CLL cells from untreated patients with this disease, it is demonstrated that engagement of surface IgM elicits a powerful survival program. The response includes inhibition of caspase activity, activation of NF-kappaB, and expression of mcl-1, bcl-2, and bfl-1 in the tumor cells. Blocking phosphatidylinositol 3-kinase (PI3-K), a critical mediator of signals through the antigen receptor, completely abrogated mcl-1 induction and impaired survival in the stimulated cells. These data support the contention that CLL cell survival is promoted by antigen for which the malignant clone has affinity, and suggest that pharmacologic interference with antigen-receptor-derived signals has potential for therapy in patients with CLL.

journal_name

Blood

journal_title

Blood

authors

Bernal A,Pastore RD,Asgary Z,Keller SA,Cesarman E,Liou HC,Schattner EJ

doi

10.1182/blood.v98.10.3050

subject

Has Abstract

pub_date

2001-11-15 00:00:00

pages

3050-7

issue

10

eissn

0006-4971

issn

1528-0020

journal_volume

98

pub_type

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