Synergistic suppression of the PI3K inhibitor CAL-101 with bortezomib on mantle cell lymphoma growth.

Abstract

OBJECTIVE:

To investigate the effects of CAL-101, particularly when combined with bortezomib (BTZ) on mantle cell lymphoma (MCL) cells, and to explore its relative mechanisms.

METHODS:

MTT assay was applied to detect the inhibitory effects of different concentrations of CAL-101. MCL cells were divided into four groups: control group, CAL-101 group, BTZ group, and CAL-101/BTZ group. The expression of PI3K-p110σ, AKT, ERK, p-AKT and p-ERK were detected by Western blot. The apoptosis rates of CAL-101 group, BTZ group, and combination group were detected by flow cytometry. The location changes of nuclear factor kappa-B (NF-κB) of 4 groups was investigated by NF-κB Kit exploring. Western blot was applied to detect the levels of caspase-3 and the phosphorylation of AKT in different groups.

RESULTS:

CAL-101 dose- and time-dependently induced reduction in MCL cell viability. CAL-101 combined with BTZ enhanced the reduction in cell viability and apoptosis. Western blot analysis showed that CAL-101 significantly blocked the PI3K/AKT and ERK signaling pathway in MCL cells. The combination therapy contributed to the inactivation of NF-κB and AKT in MCL cell lines. However, cleaved caspase-3 was up-regulated after combined treatment.

CONCLUSION:

Our study showed that PI3K/p110σ is a novel therapeutic target in MCL, and the underlying mechanism could be the blocking of the PI3K/AKT and ERK signaling pathways. These findings provided a basis for clinical evaluation of CAL-101 and a rationale for its application in combination therapy, particularly with BTZ.

• Authors: Fu-Lian Qu, Bing Xia, Su-Xia Li, Chen Tian, Hong-Liang Yang, Qian Li, Ya-Fei Wang, Yong Yu, Yi-Zhuo Zhang
• Journal: Cancer biology & medicine (Cancer Biol Med) Vol. 12 Issue 4 Pg. 401-8 (Dec 2015) ISSN: 2095-3941 [Print] China
• PMID: 26779377 (Publication Type: Journal Article)