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Journal Article

Integrin-linked kinase regulates chondrocyte shape and proliferation

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons78025

Grashoff,  C.
Grashoff, Carsten / Molecular Mechanotransduction, Max Planck Institute of Biochemistry, Max Planck Society;
Fässler, Reinhard / Molecular Medicine, Max Planck Institute of Biochemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons77685

Aszodi,  A.
Fässler, Reinhard / Molecular Medicine, Max Planck Institute of Biochemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons78598

Sakai,  T.
Fässler, Reinhard / Molecular Medicine, Max Planck Institute of Biochemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons77945

Fässler,  R.
Fässler, Reinhard / Molecular Medicine, Max Planck Institute of Biochemistry, Max Planck Society;

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Citation

Grashoff, C., Aszodi, A., Sakai, T., Hunziker, E. B., & Fässler, R. (2003). Integrin-linked kinase regulates chondrocyte shape and proliferation. EMBO Reports, 4(4), 432-438.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-6C3F-5
Abstract
The interaction of chondrocytes with the extracellular-matrix environment is mediated mainly by integrins. Ligated integrins are recruited to focal adhesions (FAs) together with scaffolding proteins and kinases, such as integrin-linked kinase (Ilk). Ilk binds the cytoplasmic domain of beta1-, beta2- and beta3-integrins and recruits adaptors and kinases, and is thought to stimulate downstream signalling events through phosphorylation of protein kinase B/Akt (Pkb/Akt) and glycogen synthase kinase 3-beta (GSK3-beta). Here, we show that mice with a chondrocyte-specific disruption of the gene encoding ilk develop chondrodysplasia, and die at birth due to respiratory distress. The chondrodysplasia was characterized by abnormal chondrocyte shape and decreased chondrocyte proliferation. In addition, Ilk-deficient chondrocytes showed adhesion defects, failed to spread and formed fewer FAs and actin stress fibres. Surprisingly, phosphorylation of Pkb/Akt and GSK3-beta is unaffected in Ilk-deficient chondrocytes. These findings suggest that Ilk regulates actin reorganization in chondrocytes and modulates chondrocyte growth independently of phosphorylation of Pkb/Akt and GSK3-beta.