Comparative Study of Phellodendron amurense Rupr. Components in Alleviating Diabetic Kidney Disease via the...

Area of Science:

• Pharmacology
• Nephrology
• Molecular Biology

Background:

• Diabetic kidney disease (DKD) is a significant complication of diabetes.
• Investigating natural compounds for DKD treatment is crucial.
• Phellodendron amurense Rupr. polysaccharides (PAP) show potential protective effects.

Purpose of the Study:

• To evaluate the protective effects of PAP against DKD.
• To elucidate the role of the PI3K/AKT/GSK-3β/Nrf2 signaling pathway in PAP's action.
• To compare the efficacy of PAP, alkaloids, and flavonoids from Phellodendron amurense.

Main Methods:

• In vitro: High-glucose induced HK-2 cells treated with PAP fractions.
• In vivo: Streptozotocin-induced DKD rat model treated with PAP.
• Assays: CCK-8, ROS, TUNEL, Western Blot, histological staining.

Main Results:

• PAP demonstrated significant cytoprotection against high-glucose injury in HK-2 cells.
• PAP treatment reduced glomerular damage, collagen, and glycogen in DKD rats.
• PAP activated the PI3K/AKT/GSK-3β/Nrf2 pathway, upregulating HO-1 and NQO1, while inhibiting TGF-β1/Smad2 and apoptosis.

Conclusions:

• PAP exhibits significant protective activity against diabetic kidney disease.
• The protective effects are mediated via the PI3K/AKT/GSK-3β/Nrf2 pathway.
• PAP enhances antioxidant capacity and reduces renal fibrosis and apoptosis in DKD.