Monopolar spindle 1 (Mps1) is a spindle assembly checkpoint kinase that plays an essential role in the regulation of mitosis. AZ3146 inhibits human Mps1 with an IC50 value of 35 nM. In nocodazole-arrested Hela cells, AZ3146 at 1 – 30 μM inhibited the autophosphorylation of full-length Mps1. AZ3146 at 2 µM reduced the time for Hela cells to complete mitosis from 90 min to 32 min. Nearly 90% of AZ3146-treated Hela cells underwent abnormal mitoses with around 50% entering anaphase without aligning all the chromosomes and almost 30% exiting mitosis without chromosome segregation. AZ3146 at 2 µM also decreased the levels of Mad1 and Mad2 to 60% and 15%, respectively. The kinetochore recruitment of O-Mad2 in Hela cells was also blocked by at 2 µM AZ3146[3]. The exposure of GSK923295, an inhibitor targeting the mitotic kinesin Cenp-E, combined with 2 µM AZ3146 induced whole chromosome aneuploidies in cells without causing DNA damage and significant disruption to the spindle[4]. In AZ3146-resistent HCT116 cells created by long-term exposure of AZ3146, 24-hour incubation of 1 and 2 µM AZ3146 abolished the G1 and G2 - M peaks in the parental cell line and made them rapidly exit from mitosis[5].
作用机制
AZ3146 might inhibit Mps1 by promoting its kinetochore localization[3].
AZ3146 细胞实验
Cell Line
Concentration
Treated Time
Description
References
HeLa cells
2 µM
2 hours
AZ3146 dramatically accelerated mitotic exit and dramatically reduced Mad2 localization to kinetochores, but had a less pronounced effect on Mad1.
Inhibition of Myc-tagged wild type MPS1 autophosphorylation in human HCT116 cells after 2 hrs in presence of proteosome inhibitor MG132, IC50=0.72 μM
24256217
human HCT116 cells
Growth inhibition assay
72 h
Growth inhibition in human HCT116 cells after 72 hrs by MTT assay, GI50=1.2 μM
24256217
sf9 insect cells
Function assay
Inhibition of N-terminal 6XHis-tagged/GST-tagged full length human MPS1 expressed in recombinant baculovirus infected sf9 insect cells using 5FAM-DHTGFLTEYVATRCONH2 as substrate after 60 to 90 mins by fluorescence assay, IC50=7 nM
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