Tetramethylpyrazine and Paeoniflorin Synergistically Attenuate Cholesterol Efflux in Macrophage Cells via Enhancing...

Area of Science:

• Cardiovascular Research
• Cell Biology
• Pharmacology

Background:

• Foam cell formation is central to atherosclerosis development.
• ATP-binding cassette transporters (ABCA1, ABCG1) and scavenger receptor B1 (SR-B1) facilitate cholesterol removal.
• Dysregulated cholesterol efflux contributes to atherosclerotic plaque progression.

Purpose of the Study:

• To investigate the effect of the tetramethylpyrazine-paeoniflorin pair (TP) on cholesterol efflux in macrophage-derived foam cells.
• To determine if TP influences the expression of key cholesterol transporters (ABCA1, ABCG1, SR-B1).
• To assess TP's impact on pro-inflammatory cytokines associated with foam cell formation.

Main Methods:

• RAW264.7 macrophages were induced into foam cells using oxidized low-density lipoprotein (ox-LDL).
• Foam cells were treated with TP, and cholesterol deposition was visualized using oil red O staining.
• Cholesterol efflux capacity, transporter gene/protein expression (ABCA1, ABCG1, SR-B1), and cytokine levels (TNF-α, IL-1β, MCP-1) were quantified.

Main Results:

• TP treatment significantly reduced ox-LDL-induced cholesterol accumulation and foam cell formation.
• TP promoted cholesterol efflux to apolipoprotein A1 (apoA1), linked to increased ABCA1 and ABCG1 expression.
• TP downregulated the secretion of pro-inflammatory cytokines: tumor necrosis factor-alpha (TNF-α), interleukin-1 beta (IL-1β), and monocyte chemotactic protein-1 (MCP-1).

Conclusions:

• The tetramethylpyrazine-paeoniflorin pair (TP) effectively mitigates cholesterol deposition in foam cells.
• TP enhances cholesterol efflux by upregulating ABCA1 and ABCG1 expression.
• TP exerts anti-atherogenic effects by reducing pro-inflammatory cytokine secretion, suggesting therapeutic potential.