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2017 ; 8
(ä): 747
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The Selective Phosphoinoside-3-Kinase p110? Inhibitor IPI-3063 Potently
Suppresses B Cell Survival, Proliferation, and Differentiation
#MMPMID28713374
Chiu H
; Mallya S
; Nguyen P
; Mai A
; Jackson LV
; Winkler DG
; DiNitto JP
; Brophy EE
; McGovern K
; Kutok JL
; Fruman DA
Front Immunol
2017[]; 8
(ä): 747
PMID28713374
show ga
The class I phosphoinoside-3-kinases (PI3Ks) are important enzymes that relay
signals from cell surface receptors to downstream mediators driving cellular
functions. Elevated PI3K signaling is found in B cell malignancies and
lymphocytes of patients with autoimmune disease. The p110? catalytic isoform of
PI3K is a rational target since it is critical for B lymphocyte development,
survival, activation, and differentiation. In addition, activating mutations in
PIK3CD encoding p110? cause a human immunodeficiency known as activated PI3K
delta syndrome. Currently, idelalisib is the only selective p110? inhibitor that
has been FDA approved to treat certain B cell malignancies. p110? inhibitors can
suppress autoantibody production in mouse models, but limited clinical trials in
human autoimmunity have been performed with PI3K inhibitors to date. Thus, there
is a need for additional tools to understand the effect of pharmacological
inhibition of PI3K isoforms in lymphocytes. In this study, we tested the effects
of a potent and selective p110? inhibitor, IPI-3063, in assays of B cell
function. We found that IPI-3063 potently reduced mouse B cell proliferation,
survival, and plasmablast differentiation while increasing antibody class
switching to IgG1, almost to the same degree as a pan-PI3K inhibitor. Similarly,
IPI-3063 potently inhibited human B cell proliferation in vitro. The p110?
isoform has partially overlapping roles with p110? in B cell development, but
little is known about its role in B cell function. We found that the p110?
inhibitor AS-252424 had no significant impact on B cell responses. A novel dual
p110?/? inhibitor, IPI-443, had comparable effects to p110? inhibition alone.
These findings show that p110? is the dominant isoform mediating B cell responses
and establish that IPI-3063 is a highly potent molecule useful for studying p110?
function in immune cells.