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It is well known that posterior capsule opacification (PCO), one of the most common late postoperative complications of cataract surgery, is mainly caused by proliferation and differentiation of remaining lens epithelial cells (LECs) on the posterior lens capsule. Many authors suggest that alterations induced by the pathophysiology of cataracts, its metabolism and the use of 0.1% trypan blue (TB) must cause some degree of cellular damage on these cells, wicht would help to prevent and/or reduce the incidence of PCO after cataract surgery in humans. Therefore, the aim of this study was to evaluate the expression of cell death markers on LECs of older dogs with diabetic and hypermature cataracts, after capsulorhexis, both using 0.1% TB. Twenty samples collected from 13 dogs of different breeds, with ages varying from 8 to 12 years-old, with diabetic and hypermature cataracts, which had been subjected to phacoemulsification surgery (Phaco) using 0.1% TB for staining were studied. Animals were classified as dogs with diabetic (DC) and hypermature cataracts (HC), and expression of molecular markers for apoptosis and autophagy (caspase-3 and beclin-1) on LECs were obtained by immunofluorescence technique. The expression of caspase-3 and beclin-1 was observed in every studied sample and did not differ between groups. In conclusion, our findings suggest that apoptosis and autophagy processes occur to LECs in older dogs presenting diabetic and hypermature cataracts after Phaco utilizing 0.1% TB. Our results may be helpful to future studies of PCO in post-phacoemulsification surgery patients.

Evaluation of programmed cell death processes on the lens epithelium of older dogs with diabetic and hypermature cataracts