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MicroRNAs and cataracts: correlation among let-7 expression, age and the severity of lens opacity
Chi-Hsien Peng1, Jorn-Hon Liu, Lin-Chung Woung
1Department of Ophthalmology, Taipei Veterans General Hospital, No.201, Sec. 2, Shih-Pai Rd., Taipei 11217, Taiwan, ROC.
Background:
Let-7 microRNA is an important regulator of cellular ageing and tissue senescence. The objective of this study is to evaluate the expression of let-7a/let-7b/let-7c microRNAs in human age-related cataracts.
Aim:
To evaluate the correlation among the severity of lens opacity, the level of let-7a/let-7b/let-7c microRNA expression and patient age in the context of age-related cataracts.
Methods:
The authors evaluated the mRNA level of let-7a/let-7b/let-7c microRNA in lens epithelia obtained from 174 eyes with age-related cataracts. The authors also recorded the patient age and the severity of lens opacity as classified according to the modified version of the Lens Opacities Classification System version III.
Results:
Let-7b microRNA expression was demonstrated to be positively associated with patient age (R=0.472; p<0.001). A positive correlation was also observed between higher N, C and P cataract scores and higher expression of let-7b microRNA in patients with age-related cataracts (p<0.001). However, no significant correlation was observed between the let-7a and let-7c microRNA expression levels and either the severity of lens opacity or the patient age.
Conclusion:
These findings suggest that microRNAs play a role in age-related cataracts. A local let-7b microRNA increase may represent a risk factor in the formation of age-related cataracts.
Insights
Increased let-7b microRNA expression correlates with age-related cataracts and patient age. This suggests microRNAs, specifically let-7b, may be a risk factor in cataract development.
Area of Science:
- Ophthalmology
- Molecular Biology
- Gerontology
Background:
- Let-7 microRNA family regulates cellular aging and tissue senescence.
- Age-related cataracts are a significant cause of vision impairment.
- Investigating microRNA involvement in cataractogenesis is crucial.
Purpose of the Study:
- To assess let-7a, let-7b, and let-7c microRNA expression in age-related human cataracts.
- To determine correlations between microRNA levels, cataract severity, and patient age.
Main Methods:
- Quantitative analysis of let-7a/let-7b/let-7c microRNA mRNA levels in lens epithelia from 174 cataractous eyes.
- Classification of lens opacity severity using the Lens Opacities Classification System version III.
- Statistical analysis to correlate microRNA expression with patient age and cataract scores.
Main Results:
- A significant positive correlation was found between let-7b microRNA expression and patient age (R=0.472, p<0.001).
- Higher expression of let-7b microRNA was associated with increased nuclear (N), cortical (C), and posterior subcapsular (P) cataract scores (p<0.001).
- No significant correlations were observed for let-7a or let-7c microRNA expression with age or cataract severity.
Conclusions:
- MicroRNAs play a role in the pathogenesis of age-related cataracts.
- Elevated local let-7b microRNA levels may serve as a risk factor for developing age-related cataracts.
- Further research into microRNA-targeted therapies for cataracts is warranted.
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