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Lipid-Lowering Drugs: Statins and Miscellaneous Agents01:20

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Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
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Rutin and Quercetin Decrease Cholesterol in HepG2 Cells but Not Plasma Cholesterol in Hamsters by Oral

Ning Liang1,2,3, Yuk-Man Li1, Zouyan He1

  • 1School of Life Sciences, Chinese University of Hong Kong, Shatin, NT, Hong Kong 999077, China.

Molecules (Basel, Switzerland)
|July 2, 2021
PubMed
Summary

Rutin and quercetin effectively reduced cholesterol in lab cell studies but showed minimal impact on plasma cholesterol in hamsters, likely due to poor bioavailability. Further research into flavonoid absorption is needed.

Keywords:
LDLRLXRSREBP2cholesterolhamstersquercetinrutin

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Area of Science:

  • Biochemistry
  • Nutritional Science
  • Cell Biology

Background:

  • Rutin (R) and quercetin (Q) are common dietary flavonoids with previously inconsistent reported effects on plasma cholesterol.
  • Understanding their impact on cholesterol metabolism is crucial for nutritional and pharmacological applications.

Purpose of the Study:

  • To investigate the effects of Rutin and Quercetin on cholesterol metabolism.
  • To compare their efficacy in vitro using HepG2 cells and in vivo using hypercholesterolemia hamster models.

Main Methods:

  • HepG2 cells were treated with R and Q to assess cholesterol levels, gene/protein expression (SREBP2, LDLR, LXRα), and LDL-C uptake.
  • Hypercholesterolemia hamsters were fed diets supplemented with R and Q for 8 weeks, followed by analysis of plasma and liver cholesterol.

Main Results:

  • In vitro: Both R and Q decreased cholesterol in HepG2 cells, up-regulating SREBP2, LDLR, and LXRα expression. Quercetin improved LDL-C uptake.
  • In vivo: Neither R nor Q affected plasma total cholesterol in hamsters. Quercetin significantly reduced liver cholesterol.
  • Discrepancy attributed to poor intestinal bioavailability of flavonoids in vivo.

Conclusions:

  • Rutin and Quercetin demonstrate cholesterol-lowering potential in vitro at the cellular level.
  • Oral administration of R and Q shows limited efficacy in reducing plasma cholesterol in vivo, suggesting bioavailability is a key limitation.
  • Further studies are needed to enhance the bioavailability of these flavonoids for therapeutic benefits.