The researchers investigated the potential mechanism of Qi-Shen-Tang (QST), a combination of two traditional Chinese medicines, on retinitis pigmentosa, an eye disease. They induced a retinitis pigmentosa model in mice while subsequently treating them with QST. They then examined the impact of the medicine on the tissue morphology and function of the retina in these model mice, in addition to monitoring factors such as retinal blood flow and fundus structure.

The study found that the treatment with QST led to notable improvements in the retinal tissue morphology and function. In addition, they observed an increase in retinal blood flow and normalization of the fundus structure. Following the treatment, the amounts of iron and malondialdehyde in the retinal tissue were significantly reduced, while the levels of superoxide dismutase, glutathione, and the protein expressions of various enzymes significantly increased. Molecular docking results also revealed potential interactions between the components of QST and key proteins of a particular signaling pathway, namely the Nuclear factor erythroid 2-related factor 2/ Glutathione peroxidase 4 pathway. The results suggest that QST may inhibit ferroptosis by suppressing this signaling pathway, thereby mitigating retinitis pigmentosa-induced damage to the retinal tissue.