Transient antagonism of anti-CD20 monoclonal antibodies and PI3K inhibitor idelalisib in DLBCL cell lines.

Abstract:

INTRODUCTION:PI3K inhibitors are evaluated for relapsed and refractory Diffuse large B-cell lymphoma (DLBCL) patients. OBJECTIVE:As rituximab has shown to influence B-cell receptor (BCR) signaling, we investigated the interaction of anti-CD20 antibody rituximab and the new type II glycoengineered anti-CD20 antibody obinutuzumab in combination with the PI3K delta inhibitor idelalisib. METHODS:Established DLBCL cell lines were treated with either rituximab or obinutuzumab alone or in combination with PI3K delta inhibitor idelalisib. RESULTS:Rituximab and to a lesser extent obinutuzumab monotherapy resulted in a temporary upregulation of p-Akt, p42/44, and p38 signaling pathways. Idelalisib reduced p-Akt expression. Rituximab antagonized the p-Akt downregulation at early time points, while obinutuzumab did not interfere with idelalisib's effects. In cell growth analysis, early antagonism could also be detected. CONCLUSION:The combination of idelalisib with CD antibodies shows an initial antagonism of rituximab but not obinutuzumab in downregulation of PI3K-signaling targets.

journal_name

Eur J Haematol

authors

Zoellner AK,Peter N,Zimmermann Y,Hutter G,Hiddemann W,Dreyling M

doi

10.1111/ejh.13075

subject

Has Abstract

pub_date

2018-04-04 00:00:00

eissn

0902-4441

issn

1600-0609

pub_type

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