β-sitosterol alleviates atherosclerosis by regulating catalase

Area of Science:

• Pharmacology
• Biochemistry
• Cardiovascular Research

Background:

• Atherosclerosis is a chronic inflammatory disease characterized by plaque buildup in arteries.
• Gegen (Puerariae Lobatae Radix) is a traditional Chinese medicine with potential cardiovascular benefits.
• Identifying active components and mechanisms is crucial for therapeutic development.

Purpose of the Study:

• To identify the primary active component of Gegen responsible for anti-atherosclerotic effects.
• To elucidate the mechanism of action of this component in preventing and treating atherosclerosis.

Main Methods:

• Bioinformatics analysis to predict active compounds.
• In vivo studies assessing plaque formation, platelet activation, and lipid profiles.
• In vitro experiments evaluating lipid deposition and vascular smooth muscle cell (VSMC) behavior.
• Gene knockdown and pathway inhibition experiments (catalase, PI3K/Akt/mTOR).

Main Results:

• Beta-sitosterol identified as a key anti-atherosclerotic component of Gegen.
• In vivo: Beta-sitosterol reduced plaque formation, platelet activation, serum total cholesterol, and triglycerides.
• In vitro: Beta-sitosterol inhibited VSMC lipid deposition and phenotypic transformation.
• Catalase knockdown exacerbated lipid deposition and VSMC changes, activating the PI3K/Akt/mTOR pathway.
• mTOR inhibition reversed the effects of catalase knockdown.

Conclusions:

• Beta-sitosterol alleviates atherosclerosis by inhibiting VSMC lipid deposition and phenotypic transformation.
• The mechanism involves activating catalase and suppressing the PI3K/Akt/mTOR signaling pathway.
• Beta-sitosterol represents a promising therapeutic agent for atherosclerosis.