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Kindlin-2 preserves integrity of the articular cartilage to protect against osteoarthritis

Xiaohao Wu1, Yumei Lai2, Sheng Chen3

  • 1Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, China.

Nature Aging
|April 28, 2023
PubMed

Insights

Kindlin-2 is crucial for maintaining joint health. Its deficiency in cartilage cells triggers osteoarthritis by activating Stat3 and Runx2, offering a potential therapeutic target for this aging-related disease.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Orthopedics

Background:

  • Osteoarthritis (OA) is a prevalent aging-related joint disease with incompletely understood mechanisms.
  • Articular chondrocytes play a key role in maintaining cartilage integrity.

Purpose of the Study:

  • To investigate the role of kindlin-2 in articular chondrocytes and its involvement in osteoarthritis pathogenesis.
  • To identify the molecular pathway linking kindlin-2 to OA development and explore therapeutic strategies.

Main Methods:

  • Analysis of kindlin-2 expression in aged mice and human OA cartilage.
  • Genetic manipulation of kindlin-2, Stat3, and Runx2 in mouse articular chondrocytes.
  • Induction of OA through joint instability and aging models.
  • Pharmacological inhibition of Stat3.
  • Intra-articular injection of adeno-associated virus serotype 5 (AAV5)-kindlin-2.

Main Results:

  • Kindlin-2 is downregulated in degenerated cartilage of aged mice and OA patients.
  • Kindlin-2 deficiency in chondrocytes causes spontaneous and exacerbated OA, promoting mitochondrial oxidative stress and activating Stat3/Runx2 signaling.
  • Inhibition of Stat3 or deletion of Runx2 ameliorates OA lesions caused by kindlin-2 deficiency.
  • AAV5-kindlin-2 injection decelerates OA progression in mouse models.

Conclusions:

  • Kindlin-2 is essential for maintaining articular cartilage integrity.
  • A novel pathway involving kindlin-2, Stat3, and Runx2 in chondrocytes is identified as critical for OA pathogenesis.
  • Targeting this kindlin-2-Stat3-Runx2 axis presents a potential therapeutic avenue for osteoarthritis.

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