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Published on: May 26, 2023
Functional Imaging of Mitochondria in Age-Related Macular Degeneration Using Flavoprotein Fluorescence
Purpose:
Oxidative stress-induced mitochondrial dysfunction is implicated in the pathogenesis of age-related macular degeneration (AMD). Oxidized mitochondrial flavoprotein fluorescence (FPF) may serve as a quantifiable biomarker of oxidative stress, reported as either mean score for the entire image (intensity) or variability (heterogeneity). This study examines FPF intensity and heterogeneity across a large patient cohort of various Beckman stages of AMD.
Methods:
This study enrolled patients with isolated AMD and healthy control patients with no retinopathy between 2018 and 2021. Multivariate logistic regression analysis included stage of AMD, age, gender, ethnicity, and smoking status. Analysis of Variance test compared mean FPF intensity and heterogeneity between disease states.
Results:
Four hundred fifty-six eyes (228 AMD eyes, 228 age-matched control eyes) were included in the final multivariate analysis. Intermediate, geographic atrophy (GA), and neovascular AMD correlated with significantly increased FPF intensity (P < 0.001, respectively), while all AMD stages correlated with increased FPF heterogeneity (P < 0.001, respectively). FPF intensity and heterogeneity were significant negative predictors of visual acuity (P = 0.018 and 0.024, respectively).
Conclusions:
This prospective observational study further implicates mitochondrial damage in AMD pathophysiology. Long-term clinical trials will be needed to examine the predictive role of FPF imaging in patients over time. [.
Insights
Oxidative stress impacts age-related macular degeneration (AMD). Oxidized mitochondrial flavoprotein fluorescence (FPF) shows increased intensity and heterogeneity in AMD, predicting worse visual acuity.
Area of Science:
- Ophthalmology
- Mitochondrial Biology
- Biomarker Discovery
Background:
- Mitochondrial dysfunction due to oxidative stress is a key factor in age-related macular degeneration (AMD) development.
- Oxidized mitochondrial flavoprotein fluorescence (FPF) offers a quantifiable method to assess oxidative stress.
- FPF can be measured as intensity (mean score) or heterogeneity (variability).
Purpose of the Study:
- To investigate the relationship between FPF intensity and heterogeneity and different stages of age-related macular degeneration (AMD).
- To evaluate FPF as a potential biomarker for AMD progression and its impact on visual acuity.
Main Methods:
- A cohort study included 228 AMD patients and 228 age-matched controls (2018-2021).
- Multivariate logistic regression analyzed AMD stage, age, gender, ethnicity, and smoking status.
- Analysis of Variance compared mean FPF intensity and heterogeneity between disease states.
Main Results:
- AMD of all stages showed significantly increased FPF intensity and heterogeneity compared to controls (P < 0.001).
- Specifically, intermediate, geographic atrophy (GA), and neovascular AMD correlated with increased FPF intensity.
- Both FPF intensity and heterogeneity were significant negative predictors of visual acuity (P = 0.018 and 0.024).
Conclusions:
- This study reinforces the role of mitochondrial damage in AMD pathophysiology.
- FPF imaging shows promise as a biomarker for AMD.
- Further clinical trials are warranted to confirm the predictive value of FPF in AMD patients over time.
