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Biomarkers of cardiovascular disease as risk factors for age-related macular degeneration
Andrew K Vine1, Jacqueline Stader, Kari Branham
1Department of Ophthalmology, University of Michigan, Kellogg Eye Center, Ann Arbor, Michigan 48105, USA. akv@umich.edu
Insights
Individuals with age-related macular degeneration (AMD) show higher levels of C-reactive protein (CRP) and homocysteine. These elevated biomarkers suggest a link between AMD, chronic inflammation, and atherosclerosis.
Area of Science:
- Ophthalmology
- Cardiovascular Medicine
- Biomarkers
Background:
- Age-related macular degeneration (AMD) is a leading cause of vision loss.
- Cardiovascular disease shares risk factors with AMD.
- C-reactive protein (CRP) and homocysteine are established cardiovascular disease biomarkers.
Purpose of the Study:
- To compare CRP and homocysteine levels in individuals with and without AMD.
- To investigate the association between these biomarkers and AMD.
Main Methods:
- Case-control study design.
- Involved 79 individuals with AMD and 77 controls.
- Measured plasma C-reactive protein (CRP) and homocysteine levels.
- Collected detailed cardiovascular histories.
Main Results:
- Individuals with AMD had significantly higher mean CRP (3.42 mg/l vs 2.30 mg/l) and homocysteine (11.72 µmol/l vs 8.88 µmol/l) levels.
- Higher CRP and homocysteine were identified as risk factors for AMD in logistic regression models.
- No significant differences were found in gender, diabetes, hypertension, statin use, or smoking between groups.
Conclusions:
- Elevated CRP and homocysteine levels are associated with age-related macular degeneration (AMD).
- These findings suggest that chronic inflammation and atherosclerosis play a role in AMD pathogenesis.
- The study highlights potential shared pathways between cardiovascular disease and AMD.
Purpose:
To measure and contrast 2 biomarkers of cardiovascular disease, C-reactive protein (CRP) and plasma homocysteine, in individuals with age-related macular degeneration (AMD) and control individuals without AMD.
Design:
Case-control study.
Participants:
Seventy-nine affected individuals and 77 unaffected individuals from the AMD Genetic Study Group returned to obtain CRP and homocysteine levels.
Methods:
Both affected and unaffected individuals underwent testing for CRP and homocysteine. A detailed cardiovascular history was taken.
Main Outcome Measures:
Mean CRP and homocysteine levels in affected and unaffected individuals.
Results:
Mean CRP levels for affected and unaffected individuals were 3.42 and 2.30 mg/l, respectively (P = 0.03). Mean homocysteine levels for affected and unaffected individuals were 11.72 and 8.88 micromol/l, respectively (P<0.0001). In logistic regression models, older age, higher CRP, and higher homocysteine were risk factors for AMD. There were no significant differences between cases and controls in terms of gender, diabetes, hypertension, use of statin drugs, and smoking. The control group was significantly younger and had a lower rate of vitamin usage than the affected group.
Conclusions:
Elevated CRP and homocysteine levels are associated with AMD and implicate the role of chronic inflammation and atherosclerosis.
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