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Extraction and Purification of Polyphenols from Freeze-dried Berry Powder for the Treatment of Vascular Smooth Muscle Cells In Vitro
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Extraction and Purification of Polyphenols from Freeze-dried Berry Powder for the Treatment of Vascular Smooth Muscle Cells In Vitro

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Mulberry leaf polyphenols possess antiatherogenesis effect via inhibiting LDL oxidation and foam cell formation

Mon-Yuan Yang1, Chien-Ning Huang, Kuei-Chuan Chan

  • 1Institute of Biochemistry and Biotechnology, Chung-Shan Medical University, Number 110, Section 1, Chien-Kuo North Road, Taichung 402, Taiwan.

Journal of Agricultural and Food Chemistry
|February 15, 2011
PubMed

Insights

Mulberry leaf extracts show anti-atherogenic effects by inhibiting oxidized LDL. Polyphenolic extracts (MLPE) were more potent, reducing foam cell formation and regulating ox-LDL uptake in macrophages.

Area of Science:

  • Cardiovascular Research
  • Pharmacology
  • Nutraceuticals

Background:

  • Atherogenesis is characterized by oxidized low-density lipoprotein (ox-LDL) uptake by macrophages.
  • Mulberry leaf extracts (MLE) and their polyphenolic constituents (MLPE) are investigated for potential therapeutic benefits.

Purpose of the Study:

  • To evaluate the anti-atherogenic effects of MLE and MLPE.
  • To compare the potency of MLE and MLPE in inhibiting ox-LDL-induced cellular damage and foam cell formation.

Main Methods:

  • Assessing the inhibition of LDL oxidation and lipid peroxidation by MLE and MLPE.
  • Measuring reactive oxygen species (ROS) generation and antioxidant enzyme activity (SOD-1, GPx) in macrophages.
  • Quantifying foam cell formation and the expression of key scavenger receptors (PPARγ, CD36, SR-A).

Main Results:

  • Both MLE and MLPE inhibited LDL oxidation and lipid peroxidation, with MLPE demonstrating greater potency.
  • MLPE significantly reduced ROS generation and enhanced SOD-1 and GPx levels in macrophages more effectively than MLE.
  • MLPE showed 1.5-fold higher potency in decreasing foam cell formation compared to MLE at equivalent doses.
  • MLE and MLPE downregulated the expression of PPARγ, CD36, and SR-A, indicating modulation of ox-LDL uptake pathways.

Conclusions:

  • Mulberry leaf extracts, particularly the polyphenolic fraction (MLPE), exhibit significant anti-atherogenic properties.
  • MLPE demonstrates superior efficacy in mitigating ox-LDL-induced cellular damage and foam cell formation.
  • MLPE warrants further investigation as a potential therapeutic agent for preventing atherosclerosis.

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