Perlecan Functions in Cartilage Development and Mechanobiology

Perlecan is a large heparan sulphate proteoglycan integral to the assembly, maintenance and mechanical responsiveness of cartilage. During embryonic and postnatal cartilage development, perlecan localises chiefly in the pericellular matrix surrounding chondrocytes, where its heparan sulphate chains bind growth factors and morphogens that direct cell proliferation, differentiation and matrix deposition. In growth plate and rudiment cartilages, these interactions regulate endochondral ossification through the controlled presentation of fibroblast growth factors and hedgehog proteins. In mature articular cartilage, perlecan contributes to extracellular matrix stability and resilience under load by organising collagen networks and interacting with other matrix proteoglycans. Mechanobiologically, perlecan acts as a transducer of mechanical cues: deformation of the pericellular matrix alters growth factor availability and signals chondrocytes to adjust anabolic and catabolic activities. Emerging evidence also points to non-canonical nuclear roles for perlecan in chromatin modulation and gene regulation. Deficiencies or modifications of perlecan compromise cartilage stiffness, matrix integrity and repair capacity, with implications for degenerative joint diseases and skeletal dysplasias.

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Perlecan Functions in Cartilage Development and Mechanobiology publication trend

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Technical terms

Perlecan: A large heparan sulphate proteoglycan present in the pericellular and extracellular matrices of cartilage, involved in matrix assembly, growth factor binding and mechanotransduction.

Chondrocyte: A specialised cartilage cell responsible for synthesising and maintaining extracellular matrix components, including collagen and proteoglycans.

Pericellular matrix: A narrow matrix zone immediately surrounding chondrocytes, enriched in proteoglycans and collagen VI, mediating mechanical signal transduction.

Extracellular matrix (ECM): The complex network of proteins and polysaccharides surrounding cells that provides structural support and biochemical signals.

Heparan sulphate (HS): A linear polysaccharide chain attached to proteoglycans, capable of binding growth factors and modulating signalling gradients.

Mechanotransduction: The cellular process by which mechanical forces are converted into biochemical signals, influencing cell behaviour and tissue homeostasis.

Rudiment cartilage: Transient embryonic cartilage templates populated by proliferative chondroprogenitors, later replaced by bone through endochondral ossification.

Growth plate cartilage: Cartilage at the ends of long bones that undergoes regulated proliferation and hypertrophy to drive longitudinal bone growth.

Articular cartilage: Permanent hyaline cartilage covering joint surfaces, adapted to resist compressive forces and provide low-friction movement.

References

1. Perlecan Knockdown Significantly Alters Extracellular Matrix Composition and Organization During Cartilage Development. Molecular & Cellular Proteomics (2020).
2. Perlecan in Pericellular Mechanosensory Cell-Matrix Communication, Extracellular Matrix Stabilisation and Mechanoregulation of Load-Bearing Connective Tissues. International Journal of Molecular Sciences (2021).
3. Regulation of FGF-2, FGF-18 and Transcription Factor Activity by Perlecan in the Maturational Development of Transitional Rudiment and Growth Plate Cartilages and in the Maintenance of Permanent Cartilage Homeostasis. International Journal of Molecular Sciences (2022).
4. The Structure, Location, and Function of Perlecan, a Prominent Pericellular Proteoglycan of Fetal, Postnatal, and Mature Hyaline Cartilages*. Journal of Biological Chemistry (2006).
5. Perlecan in the Natural and Cell Therapy Repair of Human Adult Articular Cartilage: Can Modifications in This Proteoglycan Be a Novel Therapeutic Approach?. Biomolecules (2021).