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Antihypertensive Drugs: Action of Calcium Channel Blockers01:18

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Calcium ions are essential to contract smooth muscle cells in blood vessels. They enter these cells through voltage-dependent calcium channels, specifically L-type calcium channels in the cell membrane. These L-type calcium channels are integral to the excitation-contraction coupling process in smooth muscle. When a stimulus is received by smooth muscle cells, their membrane depolarizes. This alteration in membrane potential instigates the opening of L-type calcium channels. As a result,...
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Orally administered drugs primarily enter the systemic circulation via passive diffusion through the intestinal membranes. The drug's absorption is influenced by drug stability in the gastrointestinal GI tract, membrane permeability, the surface area available for absorption, luminal drug concentration, and residence time in the lumen. Drug permeability can be enhanced by adjusting the lipophilicity, polarity, or molecular size of the drug, promoting its passive transport across intestinal...
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After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt secretion,...
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Related Experiment Video

Updated: Mar 20, 2026

Enrichment of Mammalian Tissues and Xenopus Oocytes with Cholesterol
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β-Cyclodextrins Decrease Cholesterol Release and ABC-Associated Transporter Expression in Smooth Muscle Cells and

Caroline Coisne1, Dorothée Hallier-Vanuxeem1, Marie-Christine Boucau1

  • 1EA 2465, Laboratoire de la Barrière Hémato-Encéphalique, Université d'Artois Lens, France.

Frontiers in Physiology
|June 3, 2016
PubMed
Summary

Methylated beta-cyclodextrins reduce cholesterol in arterial cells by altering reverse cholesterol transport (RCT). These compounds may offer a novel therapeutic strategy for atherosclerosis by modulating cholesterol metabolism in vessel wall cells.

Keywords:
ABCA1ABCG1aortic endothelial cellsatherosclerosischolesterolmethylated β-cyclodextrinsreverse cholesterol transfersmooth muscle cells

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Area of Science:

  • Cardiovascular Science
  • Cell Biology
  • Pharmacology

Background:

  • Atherosclerosis involves cholesterol accumulation in vessel walls, altering reverse cholesterol transport (RCT) and transporter function.
  • While macrophages are key in foam cell formation, RCT in arterial endothelial cells and smooth muscle cells (SMCs) is less understood.
  • Methylated beta-cyclodextrins (CDs) show promise in reducing atherosclerotic plaque size.

Purpose of the Study:

  • To investigate in vitro the RCT process in SMCs and arterial endothelial cells (ABAE).
  • To assess the ability of modified beta-CDs with varying methylation degrees to alter RCT in these cells.
  • To explore the therapeutic potential of methylated beta-CDs in atherosclerosis.

Main Methods:

  • Cells (SMCs and ABAE) were incubated with different methylated beta-CDs, including KLEPTOSE® CRYSMEβ.
  • Expression of ABCA1, ABCG1, and SR-BI transporters was analyzed.
  • Cholesterol efflux to ApoA-I and HDL particles was measured.

Main Results:

  • Methylated beta-CDs reduced membrane-extracted cholesterol, correlating with methylation degree.
  • Decreased cellular cholesterol led to reduced expression of ABCA1 and ABCG1.
  • Cholesterol efflux to ApoA-I and HDL particles was significantly decreased, indicating cellular counteraction.

Conclusions:

  • Methylated beta-CDs reduce cellular cholesterol content in arterial cells involved in atherosclerosis.
  • These compounds modulate the expression of ABC transporters crucial for RCT.
  • Methylated beta-CDs represent a potential therapeutic tool for atherosclerosis, warranting further investigation into their precise cellular mechanisms.