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Beneficial effects of phytochemicals in diabetic retinopathy: experimental and clinical evidence
1Department of Pharmacology and Therapeutics, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, Abu Dhabi, United Arab Emirates. rajm@uaeu.ac.ae.
Abstract:
Diabetic retinopathy (DR) is a microvascular complication of diabetes mellitus and a major preventable cause of blindness. Strict control of blood glucose, blood pressure, and lipid profiles are the pivotal criteria to reduce the risk of developing DR. Although timely intervention with laser photocoagulation therapy could mitigate the progression of DR, it may not significantly improve visual acuity. Therefore, invasive surgical interventions such as vitrectomy are sometimes the only option to treat or manage advanced stages of DR. However, the risk of intra-ocular infections outweighs the benefits of the surgery. Newer therapies such as intraocular injection of anti-vascular endothelial growth factor (VEGF) antibody and steroids serve as a viable option for the treatment of DR. However, several clinical studies that assessed the long-term efficacy and safety of this therapy have yielded inconclusive results. Therefore, there is an urgent need to develop potent and safe drugs for the effective management of DR. In this review, we discuss various plant-derived small molecules (phytochemicals) that have been investigated for retinal cytoprotective effects in pre-clinical and clinical studies. Furthermore, we highlight the caveats on using phytochemicals for the management of DR.
Insights
Diabetic retinopathy (DR) management needs safer, effective treatments. This review explores plant-derived compounds (phytochemicals) for retinal protection, offering potential alternatives to current therapies.
Area of Science:
- Ophthalmology
- Endocrinology
- Pharmacology
Background:
- Diabetic retinopathy (DR) is a leading cause of preventable blindness, stemming from diabetes mellitus complications.
- Current treatments like laser therapy and vitrectomy have limitations in improving vision or carry significant risks.
- Emerging therapies like anti-VEGF injections and steroids show mixed long-term results, highlighting the need for novel approaches.
Purpose of the Study:
- To review plant-derived small molecules (phytochemicals) investigated for retinal cytoprotective effects in diabetic retinopathy.
- To assess the potential of phytochemicals as safe and effective therapeutic agents for DR management.
- To discuss the limitations and future directions for phytochemical-based DR treatments.
Main Methods:
- Literature review of pre-clinical and clinical studies on phytochemicals and diabetic retinopathy.
- Analysis of studies investigating retinal cytoprotective effects of various plant-derived compounds.
- Evaluation of evidence regarding the efficacy and safety of phytochemicals for DR.
Main Results:
- Several plant-derived phytochemicals have demonstrated promising retinal cytoprotective effects in experimental models.
- Pre-clinical data suggests potential benefits in mitigating DR-associated retinal damage.
- Clinical evidence for the long-term efficacy and safety of these phytochemicals in humans is still developing.
Conclusions:
- Phytochemicals represent a potential source for developing novel, safer therapeutic agents for diabetic retinopathy.
- Further rigorous clinical investigation is required to establish the definitive role of phytochemicals in DR management.
- Understanding the caveats associated with phytochemical use is crucial for their successful clinical translation.
