Connexin mediated cataract prevention in mice

• Published in: PloS one Vol. 5; no. 9; p. e12624
• Main Authors: Li, Lin, Cheng, Catherine, Xia, Chun-hong, White, Thomas W, Fletcher, Daniel A, Gong, Xiaohua
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 09.09.2010; Public Library of Science (PLoS)
• Subjects: Actin; Age; Alleles; Animals; Calcium; Cataract - metabolism; Cataract - prevention & control; Cataracts; Cell signaling; Communication; Connexins - genetics; Connexins - metabolism; Crystal structure; Crystallin; Cytoskeleton; Degeneration; Disease Models, Animal; Female; Filaments; gamma-Crystallins - genetics; gamma-Crystallins - metabolism; Gap Junctions - metabolism; Gene expression; Gene Knock-In Techniques; Genetics and Genomics/Disease Models; Genetics and Genomics/Genetics of Disease; Homeostasis; Humans; In Vitro Techniques; Intercellular signalling; Lens, Crystalline - metabolism; Lenses; Light; Male; Metabolites; Mice; Mice, Inbred C57BL; Mice, Knockout; Mice, Transgenic; Muscle proteins; Mutation; Opacity; Ophthalmology; Ophthalmology/Cataracts and Other Lens Disorders; Optometry; Physical fitness; Preservation; Prevention; Proteins; Proteomics; Structural stability; Surgery; Trends; United States > US; California
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0012624

Cataracts, named for any opacity in the ocular lens, remain the leading cause of vision loss in the world. Non-surgical methods for cataract prevention are still elusive. We have genetically tested whether enhanced lens gap junction communication, provided by increased α3 connexin (Cx46) proteins expressed from α8(Kiα3) knock-in alleles in Gja8tm1(Gja3)Tww mice, could prevent nuclear cataracts caused by the γB-crystallin S11R mutation in CrygbS11R/S11R mice. Remarkably, homozygous knock-in α8(Kiα3/Kiα3) mice fully prevented nuclear cataracts, while single knock-in α8(Kiα3/-) allele mice showed variable suppression of nuclear opacities in CrygbS11R/S11R mutant mice. Cataract prevention was correlated with the suppression of many pathological processes, including crystallin degradation and fiber cell degeneration, as well as preservation of normal calcium levels and stable actin filaments in the lens. This work demonstrates that enhanced intercellular gap junction communication can effectively prevent or delay nuclear cataract formation and suggests that small metabolites transported through gap junction channels protect the stability of crystallin proteins and the cytoskeletal structures in the lens core. Thus, the use of an array of small molecules to promote lens homeostasis may become a feasible non-surgical approach for nuclear cataract prevention in the future.