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Protective effect of a specific PAF antagonist on vincristine-induced experimental retinopathy
1Laboratoire de Biophysique, Faculté de Médecine, Clermont-Ferrand, France.
Abstract:
The alkaloid vincristine displays considerable toxicity, particularly for the retina. This type of retinopathy being an inflammatory disease, we measured the effects of a new hetrazepine platelet activating factor antagonist, BN 50730, on a vincristine-induced retinopathy in the rat. Retinal impairments were established by recording several parameters of the electroretinogram obtained from isolated retina. Our results indicate that 1) the increase in PIII duration induced by vincristine is significantly reduced by BN 50730 administration 2) the decrease in the amplitude of the PIII/b wave ratio caused by vincristine is partially inhibited by treatment with BN 50730. These experiments suggest that platelet activating factor is implicated in vincristine retinopathy and demonstrate the therapeutic effect of a specific antagonist of the mediator.
Insights
Vincristine causes retinal damage, but the drug BN 50730, a platelet-activating factor antagonist, shows therapeutic effects in reducing this vincristine-induced retinopathy in rats.
Area of Science:
- Ophthalmology
- Pharmacology
- Toxicology
Background:
- Vincristine, an alkaloid, is known to cause significant retinal toxicity.
- Vincristine-induced retinopathy is characterized as an inflammatory condition.
Purpose of the Study:
- To investigate the effects of BN 50730, a novel hetrazepine platelet-activating factor antagonist, on vincristine-induced retinopathy in a rat model.
- To determine the role of platelet-activating factor in the pathogenesis of vincristine retinopathy.
Main Methods:
- Vincristine-induced retinopathy was established in rats.
- Retinal function was assessed using electroretinogram (ERG) recordings from isolated retinas.
- The effects of BN 50730 administration on ERG parameters were measured.
Main Results:
- BN 50730 significantly reduced the vincristine-induced increase in PIII duration.
- Treatment with BN 50730 partially inhibited the decrease in the PIII/b wave ratio caused by vincristine.
Conclusions:
- Platelet-activating factor plays a role in the development of vincristine retinopathy.
- BN 50730, a specific antagonist of platelet-activating factor, demonstrates a therapeutic effect in mitigating vincristine-induced retinopathy.
