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Updated: Aug 11, 2026

Development and Application of Rapamycin-regulated Tyrosine Phosphatases
06:56

Development and Application of Rapamycin-regulated Tyrosine Phosphatases

Published on: September 6, 2024

TIMP-2 upregulates RECK expression via dephosphorylation of paxillin tyrosine residues 31 and 118

J Oh1, T Diaz, B Wei

  • 1Laboratory of Cellular Oncology, Korea University Graduate School of Medicine, Ansan, Gyeonggi do, Korea. ohjs@korea.ac.kr

Oncogene
|February 24, 2006
PubMed

Insights

Tissue inhibitor of metalloproteinase-2 (TIMP-2) signals through integrin receptors to activate Rap1, enhancing RECK expression by inhibiting Src kinase activity and switching signaling from Rac1 to Rap1.

Area of Science:

  • Cellular signaling
  • Molecular biology
  • Integrin signaling

Background:

  • Tissue inhibitor of metalloproteinase-2 (TIMP-2) previously shown to enhance RECK expression via Crk-C3G-Rap1 pathway.
  • Understanding the precise signal transduction mechanism from integrin receptors to this pathway is crucial.

Purpose of the Study:

  • To elucidate the mechanism of TIMP-2 signal transduction from the alpha3beta1 integrin receptor to the Crk-C3G-Rap1 molecular complex.
  • To investigate how TIMP-2 influences Src kinase activity and downstream effectors.

Main Methods:

  • Treatment of human microvascular endothelial cells (hMVECs) with TIMP-2.
  • Analysis of protein-protein interactions (Src-Csk, paxillin-Crk-DOCK180, paxillin-Crk-C3G).
  • Assessment of protein phosphorylation (Src, paxillin) and kinase activity (Src).
  • Evaluation of small GTPase activity (Rac1, Rap1) and RECK expression.

Main Results:

  • TIMP-2 treatment increased Src phosphorylation at Tyr-527 via enhanced Src-Csk association, reducing Src kinase activity.
  • This led to dephosphorylation of paxillin at Tyr-31/118 and disassembly of the paxillin-Crk-DOCK180 complex, causing Rac1 inactivation.
  • TIMP-2 promoted paxillin-Crk-C3G complex formation, consistent with previous findings.
  • TIMP-2 mediated a signaling switch from Rac1 to Rap1, resulting in enhanced RECK expression.

Conclusions:

  • TIMP-2 signal transduction involves the inhibition of Src kinase activity.
  • This inhibition facilitates a switch from Rac1 to Rap1 signaling.
  • The signaling switch ultimately leads to enhanced expression of RECK, a matrix metalloproteinase inhibitor.

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