Pretreatment with bendazac attenuates retinal damage induced by intense light in rats.

Bendazac is a drug which protects proteins from denaturation induced by different agents. It is also effective in protecting rabbits from X-ray-induced cataract. This study deals with the effects of bendazac on the intense light-induced retinal damage in rats. Four groups of animals received orally 0, 50, 100 or 200 mg/kg of bendazac L-lysine salt three times a day for 3 days and once the fourth day, before 1 h exposure to intense-green filtered light. Fourteen days after housing in a dark room, the rats were sacrificed and the retinae were examined by light microscopy. Retinal damage was graded according to a score severity from 0 to 5. The mean score for control animals was 2.23, whereas a dose-related and statistically significant reduction of retinal damage was detected in bendazac treated rats, i.e. 1.72, 1.54 and 1.40. A protective activity in the distribution of the severity score, i.e. a higher incidence of no damaged retinae and a lower frequency in the most severely affected ones, was also observed in treated versus control rats. These results suggest a potential therapeutic value of bendazac in the treatment of those conditions, such as retinitis pigmentosa and senile macular degeneration, in which the light exposure plays a role as a co-factor.