Salvianolic acid B inhibits mitochondrial dysfunction by up-regulating mortalin

Area of Science:

• Biochemistry
• Cell Biology
• Pharmacology

Background:

• Salvianolic acid B, an antioxidant from Radix Salviae miltiorrhizae, is used for liver diseases, but its mechanism is unclear.
• Mitochondrial dysfunction contributes to liver injury, and mortalin is a key chaperone for mitochondrial integrity.
• Oxidative stress is a major factor in liver cell damage.

Purpose of the Study:

• To elucidate the therapeutic mechanism of Salvianolic acid B in protecting human hepatocytes from oxidative stress.
• To investigate the role of mortalin in mediating the protective effects of Salvianolic acid B.

Main Methods:

• Utilized the human hepatocyte cell line HL7702 and hydrogen peroxide (H2O2) to induce oxidative stress.
• Assessed mitochondrial morphology and function following Salvianolic acid B treatment.
• Examined mortalin protein expression levels via Western blotting.
• Performed mortalin knockdown experiments using siRNA.
• Analyzed mRNA expression of Mfn1 and hFis1.

Main Results:

• Salvianolic acid B prevented H2O2-induced mitochondrial deformation and dysfunction in HL7702 cells.
• Salvianolic acid B significantly upregulated mortalin protein expression.
• Mortalin knockdown abolished the protective effects of Salvianolic acid B against oxidative stress.
• Mortalin overexpression correlated with increased Mfn1 and decreased hFis1 mRNA levels.

Conclusions:

• Salvianolic acid B protects mitochondrial structure and function by upregulating mortalin.
• This protective effect is dependent on mortalin's role in maintaining mitochondrial homeostasis.
• The mechanism may involve modulation of mitofusin (Mfn1) and mitofission (hFis1) factors.