Cited by 46Protein Kinase Regulation and GTPase SignalingCalpain Protease Function and RegulationMicrotubule and mitosis dynamics

Calpain-6, a microtubule-stabilizing protein, regulates Rac1 activity and cell motility through interaction with GEF-H1

Tonami, Kazuo, Kurihara, Yukiko, Arima, Satoshi, Nishiyama, Koichi, Uchijima, Yasunobu, Asano, Tomoichiro, Sorimachi, Hiroyuki, Kurihara, Hiroki·2011·Journal of Cell Science

Abstract

Crosstalk between microtubules and actin filaments is crucial for various cellular functions, including cell migration, spreading and cytokinesis. The Rac1 GTPase plays a key role in such crosstalk at the leading edge of migrating cells in order to promote lamellipodial formation. However, the mechanism underlying the link between microtubules and Rac1 activation remains unclear. Here, we show that calpain-6 (CAPN6), a non-proteolytic calpain with microtubule-binding and -stabilizing activity, might participate in this crosstalk. Small interfering RNA (siRNA)-induced knockdown of Capn6 in NIH 3T3 cells resulted in Rac1 activation, which promoted cell migration, spreading and lamellipodial protrusion. This increase in Rac1 activity was abolished by knockdown of the Rho guanine nucleotide exchange factor GEF-H1 (officially known as Arhgef2). CAPN6 and GEF-H1 colocalized with microtubules and also interacted with each other through specific domains. Upon knockdown of Capn6, GEF-H1 was shown to translocate from microtubules to the lamellipodial region and to interact with Rac1. By contrast, RhoA activity was decreased upon knockdown of Capn6, although low levels of active RhoA or the presence of RhoA molecules appeared to be required for the Capn6-knockdown-induced Rac1 activation. We suggest that CAPN6 acts as a potential regulator of Rac1 activity, through a mechanism involving interaction with GEF-H1, to control lamellipodial formation and cell motility.

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Crossref · 10.1242/jcs.072561

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Authors
Tonami, K., Kurihara, Y., Arima, S., Nishiyama, K., Uchijima, Y., Asano, T., Sorimachi, H., & Kurihara, H.
Affiliations
  • Tokyo Metropolitan Institute of Medical Science (JP)
  • The University of Tokyo (JP)
  • Hiroshima University (JP)
Venue
Journal of Cell Science
Published
2011-04-15
Volume
124
Issue
8
Pages
1214-1223
ISSN
  • 0021-9533 (ISSN-L)
  • 1477-9137
OpenAlex
W2101579738
Cited by
46
References
35
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 3 · 2021: 3 · 2020: 5 · 2019: 3 · 2018: 1 · 2017: 7 · 2016: 3 · 2015: 2 · 2014: 4 · 2013: 5 · 2012: 3
FWCI
2.08
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Cell Science (publishedVersion)
  • PubMed (publishedVersion)
Funders
Japan Society for the Promotion of Science (23591099)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Calpain Protease Function and Regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
Keywords
Rac1, GEF-H1, ARHGEF2, microtubule stabilization, cell motility, lamellipodia, cell spreading, RhoA, Rac1 activation
MeSH terms
Animals, Calpain, Cell Movement, Gene Expression Regulation, Microtubules, Protein Binding, Proto-Oncogene Proteins, Pseudopodia, Guanine Nucleotide Exchange Factors, rac1 GTP-Binding Protein, NIH 3T3 Cells, Mice, Rho Guanine Nucleotide Exchange Factors

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