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Daming capsule restores endothelial dysfunction induced by high-fat diet.

Rong Zhang1, Huifang Niu, Ning Wang

  • 1Department of Pharmacology, the State-Province Key Laboratory of Biomedicine and Pharmaceutics, Harbin, Peoples' Republic of China.

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|March 27, 2012
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Daming capsule (DMC) partially reverses high-fat diet-induced endothelial dysfunction in rats by increasing nitric oxide synthase (eNOS) expression. This traditional Chinese formula demonstrates protective effects on vascular health comparable to atorvastatin.

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Area of Science:

  • Cardiovascular Research
  • Pharmacology
  • Traditional Chinese Medicine

Background:

  • Daming capsule (DMC), a traditional Chinese formula, exhibits lipid-modulating effects with fewer side effects than conventional lipid-lowering drugs.
  • Endothelial dysfunction is a common complication of hyperlipidemia.
  • This study investigates DMC's potential to ameliorate high-fat (HF) diet-induced endothelial dysfunction and its underlying mechanisms.

Purpose of the Study:

  • To evaluate the efficacy of Daming capsule (DMC) in restoring endothelial function in rats fed a high-fat (HF) diet.
  • To elucidate the mechanisms by which DMC influences vascular reactivity.
  • To compare DMC's effects with atorvastatin (ATV), a standard lipid-lowering drug.

Main Methods:

  • Rats were assigned to four groups: control, HF diet, HF diet with DMC, and HF diet with atorvastatin (ATV).
  • After 30 days, thoracic aortas were analyzed for histology, endothelial nitric oxide synthase (eNOS) expression (western blot), and vascular tension.
  • Functional assays included assessing aortic ring contraction and relaxation, with and without L-NAME (a nitric oxide synthase inhibitor).

Main Results:

  • High-fat (HF) diet significantly impaired both contraction and relaxation of rat aortic rings.
  • Daming capsule (DMC) treatment significantly improved aortic ring relaxation compared to the HF group (P < 0.05), an effect reversed by L-NAME.
  • DMC restored reduced eNOS expression caused by the HF diet and improved histopathological changes, similar to atorvastatin (ATV).
  • DMC did not restore impaired vasocontraction, suggesting ATP-sensitive K+ channels (KATP) were not affected.

Conclusions:

  • Daming capsule (DMC) offers partial protection against high-fat diet-induced endothelial dysfunction.
  • The protective mechanism involves the upregulation of endothelial nitric oxide synthase (eNOS) expression.
  • DMC demonstrates comparable protective effects to atorvastatin on diet-induced vascular injury.