Insights & Discussion
Fructus Lycii and Salvia miltiorrhiza Bunge extract (FSE) shows potential as a clinical treatment for retinitis pigmentosa by inhibiting photoreceptor cell death following oxidative stress.
The study utilized hydrogen peroxide to induce oxidative stress in 661 W cells, which were examined with flow cytometry and an enzyme-linked immunosorbent assay. The impact of this oxidative stress on the cells’ mitochondria was observed using an electron microscope to understand the nature of cell death. The study also analyzed the compensatory effect of the Fructus Lycii and Salvia miltiorrhiza Bunge extract on the retinal structure and function of rd10 mice using histopathological examination, fundus photographs, and electroretinography. Protein levels were evaluated using Western blot assays, specifically targeting proteins including Tumor Protein p53, Solute Carrier Family 7 Member 11, Glutathione peroxidase 4, Arachidonate-12-Lipoxygenase, and Dipeptidyl peptidase 4.
The results showed that hydrogen peroxide-induced oxidative stress in 661 W cells increased oxidative stress products and certain protein expressions, while decreasing others. Notably, the activation of Glutathione peroxidase 4 did not lessen reactive oxygen species generation and had little impact on cell death. The research discovered that both Ferrostatin-1 and the extract could lessen reactive oxygen species generation and inhibit cell death of photoreceptors in retinitis pigmentosa, achieving this by inhibiting the expression of one protein and increasing the expression of two others.
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Fructus Lycii and Salvia miltiorrhiza Bunge extract improve retinal morphology and function by regulating the Nrf2/HO-1 pathway to curb oxidative reactions.
2021 Journal of Ethnopharmacology Fructus Lycii and Salvia miltiorrhiza Bunge extract alleviate retinitis pigmentosa through Nrf2/HO-1 signaling pathway Ou C, Jiang P, Tian Y, Yao Z, Yang Y, Peng J, et al.
Experimental Study Dan Shen Goji Berry Retinitis Pigmentosa
In terms of methodology, Fructus Lycii and Salvia miltiorrhiza Bunge (FS) extracts were identified through Ultra Performance Liquid Chromatography analysis and administered intragastrically over four weeks to Rd10 mice, known to model retinitis pigmentosa. Following the animals' sacrifice, histopathological examination and Scotopic electroretinography analysis were performed. Oxidative stress markers were determined and the expression levels of Nrf2 and HO-1 mRNA were evaluated via quantitative real-time PCR. Western blot and immunohistochemistry were employed to identify the expression and distribution of Nrf2 and HO-1 protein.
In the discussion of the results, substantial morphological improvements were observed regarding the thickness and number of the Outer Nuclear Layer, along with significant functional enhancements in a-amplitude and b-wave amplitude measurements, following FS extract treatment. In addition, the treatment led to a considerable escalation in superoxide dismutase and glutathione peroxidase levels and a reduction in malondialdehyde levels. Furthermore, FS extract was found to stimulate the up-regulation of Nrf2 and HO-1 mRNA and protein expression, possibly underlying the observed retinal enhancements.