Evidence for an upper affinity threshold for anti-IgM-induced apoptosis in a human B-cell lymphoma.

Abstract:

:The influence of ligand:receptor affinity on B-cell antigen receptor (BCR)-induced apoptosis in the IgM+ Burkitt lymphoma line, Ramos, was evaluated with a group of affinity-diverse murine monoclonal antibodies (MoAbs) specific for human B-cell IgM. The studies showed not only a minimal affinity threshold for the induction of apoptosis, but, interestingly, also a maximal affinity threshold above which increases in affinity were associated with diminished apoptosis. The lesser capacity of high-affinity MoAb to induce apoptosis was paralleled by a lesser capacity to induce receptor cross-linking. At high ligand concentration, high MoAb affinity was also associated with a diminished capacity to induce early protein tyrosine phosphorylation. The compromised capacity of two high-affinity MoAbs to trigger apoptosis may be, at least in part, explained by two separate phenomena that can impair the formation of mIgM cross-links: (1) more stable univalent binding and (2) a tendency for monogamous binding of both MoAb Fab to two Fab epitopes on mIgM. These in vitro studies suggest that the use of the highest affinity MoAbs for antireceptor immunotherapies that depend on receptor cross-linking might, on occasion, be contraindicated.

journal_name

Blood

journal_title

Blood

authors

Mongini PK,Liu Q,Vilensky MA,Highet PF,Inman JK

subject

Has Abstract

pub_date

1998-11-15 00:00:00

pages

3756-71

issue

10

eissn

0006-4971

issn

1528-0020

journal_volume

92

pub_type

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