Lens protein crosslinks

Lens protein crosslinks refer to the pathological covalent or non-covalent bonds that form between crystallin proteins within the ocular lens over time. Because lens proteins have virtually no turnover throughout a human's life, they are highly susceptible to cumulative post-translational modifications, including oxidation-induced disulfide bond formation and the accumulation of advanced glycation end-products (AGEs). These crosslinks lead to the formation of high-molecular-weight aggregates, which increase the stiffness of the lens and decrease its transparency. This process is a primary driver of presbyopia, the age-related loss of near-vision focusing, and the eventual development of cataracts. Therapeutic strategies targeting these crosslinks involve the use of reducing agents, such as lipoic acid derivatives, which penetrate the lens and chemically break disulfide bonds. By reducing these crosslinks, the goal is to restore the micro-rheological properties of the lens cytoplasm, thereby improving lens flexibility and optical clarity. (Sources: NIH/NEI, PubMed: 27159359, 32554349; ClinicalTrials.gov: NCT03804125).

Other names

Crystallin crosslinksLens protein aggregatesDisulfide-linked crystallinsAdvanced glycation end-products in the lensCrystallin disulfide bonds

Reduction of inter-protein disulfide bonds to restore protein solubility and lens elasticity; breaking of advanced glycation end-product (AGE) crosslinks.