Protection against methanol-induced retinal toxicity by LED photostimulation

Harry T. Whelan M.D.; Margaret T. T. Wong-Riley; Janis T. Eells

doi:10.1117/12.470602

13 June 2002 Protection against methanol-induced retinal toxicity by LED photostimulation

Harry T. Whelan M.D., Margaret T. T. Wong-Riley, Janis T. Eells

Proceedings Volume 4611, Ophthalmic Technologies XII; (2002) https://doi.org/10.1117/12.470602
Event: International Symposium on Biomedical Optics, 2002, San Jose, CA, United States

Abstract

We have initiated experiments designed to test the hypothesis that 670-nm Light-Emitting Diode (LED) exposure will attenuate formate-induced retinal dysfunction in a rodent model of methanol toxicity. Methanol intoxication produces toxic injury to the retina. The toxic metabolite formed in methanol intoxication is formic acid, a mitochondrial toxin known to inhibit cytochrome oxidase activity. 670-nm LED light has been hypothesized to act by stimulating cytochrome oxidase activity. To test this hypothesis, one group of animals was intoxicated with methanol, a second group was intoxicated with methanol and LED-treated and a third group was untreated. LED treatment (670 nm for 1 min 45 seconds equals 50 mW/cm², 4 joules/cm²) was administered at 5, 25, and 50 hours after the initial dose of methanol. At 72 hours of methanol intoxication, retinal function was assessed by measurement of ERG responses and retinas were prepared for histologic analysis. ERG responses recorded in methanol-intoxicated animals revealed profound attenuation of both rod-dominated and UV-cone mediated responses. In contrast, methanol- intoxicated animals exposed to LED treatment exhibited a nearly complete recovery of rod-dominated ERG responses and a slight improvement of UV-cone mediated ERG responses. LED treatment also protected the retina against the histopathologic changes produced by formate in methanol intoxication. These data provide evidence that LED phototherapy protects the retina against the cytotoxic actions of formate and are consistent with the hypothesis that LED photostimulation improves mitochondrial respiratory chain function.

Citation Download Citation

Harry T. Whelan M.D., Margaret T. T. Wong-Riley, and Janis T. Eells "Protection against methanol-induced retinal toxicity by LED photostimulation", Proc. SPIE 4611, Ophthalmic Technologies XII, (13 June 2002); https://doi.org/10.1117/12.470602

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KEYWORDS

Light emitting diodes

Retina

Toxicity

Photostimulation

Blood

Optic nerve

Rods

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