Journal
OPEN OPHTHALMOLOGY JOURNAL
Volume 8, Issue -, Pages 39-47Publisher
BENTHAM SCIENCE PUBL LTD
DOI: 10.2174/1874364101408010039
Keywords
Age-related macular degeneration; glycolysis; ketone body; lactate; pyruvate
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan
- Health Labour Sciences Research Grant from The Ministry of Health Labour and Welfare of Japan
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Purpose: Retinal adenosine triphosphate is mainly produced via glycolysis, so inhibition of glycolysis may promote the onset and progression of age-related macular degeneration (AMD). When glycolysis is inhibited, pyruvate is metabolized by lactic acid fermentation instead of entering the mitochondrial tricarboxylic acid (TCA) cycle. We measured urinary pyruvate and lactate levels in patients with AMD. Methods: Eight patients with typical AMD (tAMD group) and 9 patients with polypoidal choroidal vasculopathy (PCV group) were enrolled. Urinary levels of pyruvate, lactate, alpha-hydroxybutyrate, and beta-hydroxybutyrate were measured in all patients. Results: The mean urinary levels of pyruvate and lactate were 8.0 +/- 2.8 and 7.5 +/- 8.3 mu g/mg creatinine (reference values: 0.5-6.6 and 0.0-1.6), respectively, with the mean increase over the reference value being 83.6 +/- 51.1% and 426.5 +/- 527.8%, respectively. In 12 patients (70.6%), the lactate/pyruvate ratio was above the reference range. Urinary levels of alpha-hydroxybutyrate and alpha-hydroxybutyrate were decreased by -31.9 +/- 15.2% and -33.1 +/- 17.5% compared with the mean reference values. There were no significant differences of any of these glycolysis metabolites between the tAMD and PCV groups. Multivariate analysis revealed that none of the variables tested, including patient background factors (age, hypertension, diabetes, hyperlipidemia, cerebrovascular disease, alcohol, smoking, visual acuity, and AMD phenotype), were significantly associated with the lactate/pyruvate ratio. Conclusion: A high lactate/pyruvate ratio is a well-known marker of mitochondrial impairment, and it indicates poor oxidative function in AMD. Our results suggest that increased lactate levels may be implicated in the pathogenesis of AMD.
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