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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Leukemia
2015 ; 29
(9
): 1811-22
Nephropedia Template TP
gab.com Text
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English Wikipedia
The phosphoinositide-3-kinase (PI3K)-delta and gamma inhibitor, IPI-145
(Duvelisib), overcomes signals from the PI3K/AKT/S6 pathway and promotes
apoptosis in CLL
#MMPMID25917267
Balakrishnan K
; Peluso M
; Fu M
; Rosin NY
; Burger JA
; Wierda WG
; Keating MJ
; Faia K
; O'Brien S
; Kutok JL
; Gandhi V
Leukemia
2015[Sep]; 29
(9
): 1811-22
PMID25917267
show ga
The functional relevance of the B-cell receptor (BCR) and the evolution of
protein kinases as therapeutic targets have recently shifted the paradigm for
treatment of B-cell malignancies. Inhibition of p110? with idelalisib has shown
clinical activity in chronic lymphocytic leukemia (CLL). The dynamic interplay of
isoforms p110? and p110? in leukocytes support the hypothesis that dual blockade
may provide a therapeutic benefit. IPI-145, an oral inhibitor of p110? and p110?
isoforms, sensitizes BCR-stimulated and/or stromal co-cultured primary CLL cells
to apoptosis (median 20%, n=57; P<0.0001) including samples with poor prognostic
markers, unmutated IgVH (n=28) and prior treatment (n=15; P<0.0001). IPI-145
potently inhibits the CD40L/IL-2/IL-10 induced proliferation of CLL cells with an
IC50 in sub-nanomolar range. A corresponding dose-responsive inhibition of
pAKT(Ser473) is observed with an IC50 of 0.36?nM. IPI-145 diminishes the
BCR-induced chemokines CCL3 and CCL4 secretion to 17% and 37%, respectively.
Pre-treatment with 1??M IPI-145 inhibits the chemotaxis toward CXCL12; reduces
pseudoemperipolesis to median 50%, inferring its ability to interfere with homing
capabilities of CLL cells. BCR-activated signaling proteins AKT(Ser473),
BAD(Ser112), ERK(Thr202/Tyr204) and S6(Ser235/236) are mitigated by IPI-145.
Importantly, for clinical development in hematological malignancies, IPI-145 is
selective to CLL B cells, sparing normal B- and T-lymphocytes.