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Connective tissue growth factor coordinates chondrogenesis and angiogenesis during skeletal development
Sanja Ivkovic1, Byeong S Yoon, Steven N Popoff
1Department of Orthopaedic Surgery, David Geffen School of Medicine at UCLA, University of California, Los Angeles, CA 90095, USA.
Development (Cambridge, England)
|May 9, 2003
Summary
Connective tissue growth factor (CTGF) is vital for skeletal development, regulating cartilage matrix remodeling and blood vessel formation. CTGF deficiency impairs chondrocyte proliferation and angiogenesis, leading to skeletal abnormalities.
Area of Science:
- Developmental Biology
- Skeletal Biology
- Extracellular Matrix Biology
Background:
- Extracellular matrix (ECM) remodeling is crucial for skeletal development.
- Connective tissue growth factor (CTGF, also known as CCN2) interacts with ECM components and growth factors.
- CTGF's role in ECM production and angiogenesis suggests importance in development.
Purpose of the Study:
- To investigate the role of CTGF in embryonic extracellular matrix remodeling and angiogenesis.
- To characterize the developmental defects associated with CTGF deficiency.
Main Methods:
- Examined Ctgf expression patterns in midgestation embryos.
- Generated and analyzed Ctgf-deficient (Ctgf(-/-)) mice.
- Assessed skeletal morphology, chondrocyte proliferation, ECM composition, and angiogenesis in mutant mice.
Main Results:
- CTGF is expressed in vascular tissues and chondrocytes during embryonic development.
- Ctgf deficiency caused skeletal dysmorphisms due to impaired chondrocyte proliferation and ECM composition.
- Mutant growth plates showed defective matrix remodeling and impaired angiogenesis, linked to reduced VEGF expression.
Conclusions:
- CTGF is essential for chondrogenesis, regulating cell proliferation and ECM remodeling.
- CTGF couples ECM remodeling to angiogenesis in the growth plate.
- CTGF plays a critical role in skeletal development and endochondral ossification.