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CTGF facilitates cell-cell communication in chondrocytes via PI3K/Akt signalling pathway
Zuping Wu1, Chenchen Zhou1, Quan Yuan1
1State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
Cell Proliferation
|February 1, 2021
Summary
Connective tissue growth factor (CTGF) enhances gap junction intercellular communication (GJIC) in chondrocytes by upregulating connexin 43 (Cx43) expression via the PI3K/Akt pathway. This study elucidates CTGF
Area of Science:
- Cartilage biology and extracellular matrix regulation.
- Cell signaling pathways in chondrocytes.
- Intercellular communication mechanisms.
Background:
- Gap junction intercellular communication (GJIC) is crucial for articular cartilage homeostasis and response to stimuli.
- Connective tissue growth factor (CTGF) is involved in cell proliferation, migration, and adhesion.
- The role of CTGF in regulating GJIC within chondrocytes remains unexplored.
Purpose of the Study:
- To investigate the effect of CTGF on GJIC in chondrocytes.
- To elucidate the underlying biomechanisms of CTGF-mediated GJIC regulation.
Main Methods:
- Quantitative PCR (qPCR) to assess CCN family gene expression.
- Cell proliferation (CCK-8) and migration (scratch assay) assays.
- Scrape loading/dye transfer assay for GJIC visualization.
- Western blot for Cx43 and PI3K/Akt pathway proteins.
- Immunofluorescence and siRNA for mechanistic studies.
Main Results:
- CTGF (CCN2) exhibited the highest expression among CCN family members in chondrocytes.
- CTGF treatment upregulated Cx43 expression, enhancing GJIC.
- CTGF activated the PI3K/Akt pathway, promoting Akt phosphorylation and translocation.
- CTGF suppression reduced Cx43 expression and impaired GJIC.
Conclusions:
- CTGF facilitates chondrocyte communication by upregulating Cx43 expression.
- The PI3K/Akt signaling pathway is essential for CTGF-mediated enhancement of GJIC.
- This study reveals a novel mechanism for CTGF in regulating chondrocyte function.
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