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Beta-Pix-dynamin 2 complex promotes colorectal cancer progression by facilitating membrane dynamics

Authors :
Seula Keum
Esther Park
Sangmyung Rhee
TaeIn Kang
Jee-Hye Choi
Dongeun Park
Jung-Woong Kim
Ye Eun Hwang
Jangho Jeong
Soo Jung Yang
Source :
Cellular Oncology (Dordrecht)
Publication Year :
2021
Publisher :
Springer Science and Business Media LLC, 2021.

Abstract

Purpose Spatiotemporal regulation of cell membrane dynamics is a major process that promotes cancer cell invasion by acting as a driving force for cell migration. Beta-Pix (βPix), a guanine nucleotide exchange factor for Rac1, has been reported to be involved in actin-mediated cellular processes, such as cell migration, by interacting with various proteins. As yet, however, the molecular mechanisms underlying βPix-mediated cancer cell invasion remain unclear. Methods The clinical significance of βPix was analyzed in patients with colorectal cancer (CRC) using public clinical databases. Pull-down and immunoprecipitation assays were employed to identify novel binding partners for βPix. Additionally, various cell biological assays including immunocytochemistry and time-lapse video microscopy were performed to assess the effects of βPix on CRC progression. A βPix-SH3 antibody delivery system was used to determine the effects of the βPix-Dyn2 complex in CRC cells. Results We found that the Src homology 3 (SH3) domain of βPix interacts with the proline-rich domain of Dynamin 2 (Dyn2), a large GTPase. The βPix-Dyn2 interaction promoted lamellipodia formation, along with plasma membrane localization of membrane-type 1 matrix metalloproteinase (MT1-MMP). Furthermore, we found that Src kinase-mediated phosphorylation of the tyrosine residue at position 442 of βPix enhanced βPix-Dyn2 complex formation. Disruption of the βPix-Dyn2 complex by βPix-SH3 antibodies targeting intracellular βPix inhibited CRC cell invasion. Conclusions Our data indicate that spatiotemporal regulation of the Src-βPix-Dyn2 axis is crucial for CRC cell invasion by promoting membrane dynamics and MT1-MMP recruitment into the leading edge. The development of inhibitors that disrupt the βPix-Dyn2 complex may be a useful therapeutic strategy for CRC.

Details

ISSN :
22113436 and 22113428
Volume :
44
Database :
OpenAIRE
Journal :
Cellular Oncology
Accession number :
edsair.doi.dedup.....f2b35b1e937b4e45940d95bf11e1370c
Full Text :
https://doi.org/10.1007/s13402-021-00637-6