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Collagen Cross-Linking

Molecular classification: Other

Overview

Collagen cross-linking is a critical molecular process underpinning tissue stability across many organs. It can be harnessed therapeutically—most notably via riboflavin/UVA-induced photochemical reactions—to treat diseases marked by weakened connective tissue architecture such as keratoconus. The process involves both natural enzymatic mechanisms mediated mainly by lysyl oxidase as well as artificial induction using photosensitizers under controlled conditions.

Mechanism of action

Formation of covalent bonds between specific amino acids on adjacent collagen fibrils upon exposure to UVA light in the presence of a photosensitizer (riboflavin)

Biological functions

Provides mechanical strength/stabilityMaintains extracellular matrix structure

Disease associations

Corneal ectasiaKeratoconus

Safety considerations

Damage to deeper corneal layers if UV dose is too highInsufficient corneal thickness (<400 microns) leading to endothelial damage

Interacting drugs

Riboflavin

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