Proteoglycan Dynamics in Cartilage Tissue
Summary
Articular cartilage is a specialised connective tissue whose exceptional load-bearing and lubricating properties derive largely from its proteoglycan content. Proteoglycans are macromolecules composed of a core protein to which multiple glycosaminoglycan (GAG) chains are covalently attached. Aggrecan is the principal cartilage proteoglycan; through its interaction with hyaluronic acid and link protein it forms large supramolecular aggregates that entrap water and resist compressive forces. Proteoglycan synthesis, assembly and retention are regulated by chondrocytes in response to mechanical loading, developmental cues and biochemical signals. Turnover is mediated by a balanced network of anabolic enzymes and proteolytic systems—most notably aggrecanases and matrix metalloproteinases—which regulate matrix remodelling in health and contribute to matrix degradation in disease. Spatial and temporal heterogeneity in proteoglycan composition and sulphation patterns influence tissue hydration, charge density and resilience. Understanding these dynamic processes is crucial for developing diagnostics, biomaterials and targeted therapies for cartilage repair and osteoarthritis.
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Proteoglycan Dynamics in Cartilage Tissue publication trend
The graph below shows the total number of articles in proteoglycan dynamics in cartilage tissue across all publications each year (not limited to Nature Index journals).
Technical terms
Proteoglycan: A macromolecule with a protein core and covalently attached glycosaminoglycan chains, abundant in cartilage extracellular matrix.
Aggrecan: The major cartilage proteoglycan that forms hydrated aggregates with hyaluronic acid and link protein.
Glycosaminoglycan (GAG): A linear polysaccharide such as chondroitin sulfate or keratan sulfate, contributing to charge and hydration.
Aggrecanase: A proteolytic enzyme that specifically cleaves aggrecan core protein, promoting cartilage matrix turnover.
Matrix metalloproteinase (MMP): A family of zinc-dependent endopeptidases that degrade various components of the extracellular matrix.
Hyaluronic acid: A non-sulphated GAG polymer that binds to aggrecan, forming large compressive-resistant aggregates.
Link protein: A stabilising protein that mediates the non-covalent association between aggrecan and hyaluronic acid.
References
- Aggrecan heterogeneity in articular cartilage from patients with osteoarthritis. BMC Musculoskeletal Disorders (2016).
- Decreased Sulfate Content and Zeta Potential Distinguish Glycosaminoglycans of the Extracellular Matrix of Osteoarthritis Cartilage. Frontiers in Medicine (2021).
- Aggregation of Cartilage Proteoglycans I. THE ROLE OF HYALURONIC ACID. Journal of Biological Chemistry (1974).
- Proteinpolysaccharide Complex from Bovine Nasal Cartilage The Function of Glycoprotein in the Formation of Aggregates. Journal of Biological Chemistry (1969).
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