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Title 

Molecular mechanisms of the antitumor activity of SB225002: a novel microtubule inhibitor

Authors 

A E GodaM KoyamaY SowaK M ElokelyT YoshidaBo Yeon KimT Sakai

Publisher 

Elsevier

Issue Date 

2013

Citation 

Biochemical Pharmacology, vol. 85, no. 12, pp. 1741-1752

Keywords 

BAKMicrotubule destabilizerMitochondrial apoptosisMitotic arrestp38 MAPKSB225002Vinblastine-binding site

Abstract 

SB225002 (SB) is an IL-8 receptor B (IL-8RB) antagonist that has previously been shown to inhibit IL-8-based cancer cell invasion, and to possess in vivo anti-inflammatory and anti-nociceptive effects. The present study presented an evidence for the cell cycle-targeting activity of SB in a panel of p53-mutant human cancer cell lines of different origin, and investigated the underlying molecular mechanisms. A combination of cell cycle analysis, immunocytometry, immunoblotting, and RNA interference revealed that SB induced a BubR1-dependent mitotic arrest. Mechanistically, SB was shown to possess a microtubule destabilizing activity evidenced by hyperphosphorylation of Bcl2 and BclxL, suppression of microtubule polymerization and induction of a prometaphase arrest. Molecular docking studies suggested that SB has a good affinity toward vinblastine-binding site on β-tubulin subunit. Of note, SB265610 which is a close structural analog of SB225002 with a potent IL-8RB antagonistic activity did not exhibit a similar antimitotic activity. Importantly, in P-glycoprotein overexpressing NCI/Adr-Res cells the antitumor activity of SB was unaffected by multidrug resistance. Interestingly, the mechanisms of SB-induced cell death were cell-line dependent, where in invasive hepatocellular carcinoma HLE cells the significant contribution of BAK-dependent mitochondrial apoptosis was demonstrated. Conversely, SB activated p38 MAPK signaling in colorectal adenocarcinoma cells SW480, and pharmacologic inhibition of p38 MAPK activity revealed its key role in mediating SB-induced caspase-independent cell death. In summary, the present study introduced SB as a promising antitumor agent which has the potential to exert its activity through dual mechanisms involving microtubules targeting and interference with IL-8-drivin cancer progression.

ISSN 

0006-2952

Link 

http://dx.doi.org/10.1016/j.bcp.2013.04.011

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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