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RhoC GTPase Activation Assay
09:58

RhoC GTPase Activation Assay

Published on: August 22, 2010

The orphan G-protein coupled receptor RDC1: evidence for a role in chondrocyte hypertrophy and articular cartilage

S W Jones1, S M V Brockbank, M L Mobbs

  • 1Respiratory and Inflammation Research Area, Alderley Park, AstraZeneca, Macclesfield SK10 4TG, United Kingdom. simon.w.jones@astrazeneca.com

Osteoarthritis and Cartilage
|May 2, 2006
PubMed
Abstract

Insights

Activation of the RDC1 receptor in human cartilage cells influences genes linked to hypertrophy and matrix breakdown. This suggests RDC1 signaling may be crucial in early osteoarthritis development.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • RDC1 is a class A orphan G-protein coupled receptor with an uncharacterized function.
  • Understanding RDC1's role is essential for investigating cellular processes and potential disease mechanisms.

Purpose of the Study:

  • To identify agonists for the RDC1 receptor.
  • To investigate the functional consequences of RDC1 activation in human chondrocytes and cartilage.

Main Methods:

  • Computational chemistry and virtual screening were used to identify RDC1 agonists.
  • Functional assays included calcium (Ca2+) response measurement (FLIPR), gene expression analysis (quantitative real-time PCR), and siRNA-mediated knockdown.

Main Results:

  • RDC1 expression is highest in cartilage tissue.
  • RDC1 activation in chondrocytes induced a Ca2+ response and altered gene expression related to hypertrophy and matrix degradation.
  • RDC1 activation increased matrix metalloproteinase (MMP) activity in cartilage explants.

Conclusions:

  • RDC1 activation in human chondrocytes and cartilage leads to gene expression and activity changes associated with chondrocyte hypertrophy, angiogenesis, and matrix degradation.
  • RDC1 signaling may play a significant role in the early pathogenesis of osteoarthritis (OA).

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