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Proteoglycan: collagen interactions in connective tissues. Ultrastructural, biochemical, functional and evolutionary
1Chemical Morphology, Cell and Structural Biology, Manchester University, UK.
International Journal of Biological Macromolecules
|June 1, 1991
Summary
Collagen fibrils bind specific proteoglycans (PGs) at defined surface bands, supporting a new model of collagen structure and remodeling. Oxygen availability influences PG selection for tissue function.
Area of Science:
- Biochemistry
- Cell Biology
- Histology
Background:
- Proteoglycans (PGs) are crucial components of the extracellular matrix, interacting with collagen fibrils.
- Previous models suggested limited understanding of PG localization and function within collagen fibrils.
Purpose of the Study:
- To investigate the specific binding sites of proteoglycans on collagen fibrils using electron histochemistry.
- To elucidate the structural organization of collagen fibrils and propose a model for their remodeling.
Main Methods:
- Electron histochemistry utilizing cupromeronic blue staining.
- Critical electrolyte concentration methods to specifically stain proteoglycans.
- Analysis of mammalian and echinoderm tissues.
Main Results:
- Identified specific binding sites for keratan sulphate and chondroitin (dermatan) sulphate PGs on collagen fibril surfaces (a, c, d, e bands).
- Observed intra-fibrillar PGs, suggesting collagen fibrils are aggregates of 'protofibrils' carrying PGs.
- Proposed a model for collagen fibril remodeling based on protofibril recycling.
Conclusions:
- The 'one proteoglycan: one binding site' hypothesis is supported by the observed PG distribution.
- Collagen fibril structure involves protofibril aggregation, influencing remodeling processes.
- Oxygen availability plays a role in selecting specific PGs for functional roles in tissues.