Proliferative response of B chronic lymphocytic leukemia lymphocytes stimulated with IL2 and soluble CD23.

Abstract:

:The in vitro proliferative response of purified B-chronic lymphocytic leukemia (B-CLL) lymphocytes cultured in the presence of soluble CD23 (sCD23) with or without IL2 was compared to the responses induced by phorbol 12-myristate 13-acetate (PMA), Staphylococcus aureus strain Cowan I (SAC), IL1, IL2, IL4, IL6 and the combination of IL2 and interferon (IFN) alpha or IFN gamma. As expected, B-CLL lymphocytes proliferated with PMA, SAC and IL2 with a clear enhancement of the IL2-induced response by IFN alpha or IFN gamma. They failed to proliferate in response to sCD23, IL1, IL4 or IL6 alone nor to the combinations of sCD23 and any of the 3 latter cytokines. However, sCD23 significantly increased the proliferation of B-CLL cells induced by IL2, suggesting a protective effect of sCD23 on apoptosis. Serum levels of sCD23 and CD23 membrane expression were high in every patient which is compatible with the hypothesis of an autocrine or paracrine activation loop. Detectable CD23 expression was lost in all cultures except for that stimulated by PMA. Only supernatants of PMA-stimulated cultures contained high sCD23 levels.

journal_name

Leuk Lymphoma

journal_title

Leukemia & lymphoma

authors

Brizard A,Morel F,Lecron JC,Dreyfus B,Brizard F,Barra A,Preud'homme JL

doi

10.3109/10428199409049683

subject

Has Abstract

pub_date

1994-07-01 00:00:00

pages

311-8

issue

3-4

eissn

1042-8194

issn

1029-2403

journal_volume

14

pub_type

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