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Related Concept Videos

Lipid-Lowering Drugs: Statins and Miscellaneous Agents01:20

Lipid-Lowering Drugs: Statins and Miscellaneous Agents

Hyperlipidemia, a medical condition often referred to as high cholesterol, is characterized by abnormally elevated levels of lipids in the bloodstream. When present in excess, these lipids, specifically cholesterol and triglycerides, can lead to serious health complications, often involving cardiovascular diseases. Illnesses like atherosclerosis, heart attacks, and pancreatitis have all been linked to untreated hyperlipidemia. This means controlling and regulating cholesterol and triglyceride...
Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors01:20

Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors

Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...
Transducer Mechanism: Nuclear Receptors01:31

Transducer Mechanism: Nuclear Receptors

Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
Acid Suppressive Drugs for Peptic Ulcer Disease: Histamine H2-Receptor Antagonists01:28

Acid Suppressive Drugs for Peptic Ulcer Disease: Histamine H2-Receptor Antagonists

Histamine H2 receptors, which are intricately located on the basolateral membrane of parietal cells, play a crucial role in modulating gastric acid secretion. When released from enterochromaffin-like cells, histamine engages H2 receptors, initiating the cyclic AMP (cAMP) pathway. In this pathway, adenylyl cyclase converts ATP into cAMP, elevating intracellular cAMP levels. The activation of protein kinase A follows, stimulating the proton pump. This stimulation prompts the secretion of hydrogen...
Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers01:20

Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers

Class IV antiarrhythmic drugs, such as verapamil and diltiazem, block calcium channels. They primarily affect the heart, slowing the conduction in calcium-dependent tissues like the SA and AV nodes. These drugs manage reentrant supraventricular tachycardia (SVT) and reduce ventricular rate in atrial flutter/fibrillation.
Verapamil, a calcium channel blocker, inhibits calcium movement across myocardial cell membranes and vascular smooth muscle. This results in the dilation of coronary and...
Dipeptidyl Peptidase 4 Inhibitors01:23

Dipeptidyl Peptidase 4 Inhibitors

Dipeptidyl peptidase 4 (DPP-4) is a serine protease widely distributed in the body. It's involved in the inactivation of GLP-1 and GIP hormones, which are crucial for insulin regulation. DPP-4 inhibitors, such as sitagliptin (Januvia), saxagliptin (Onglyza), linagliptin (Tradjenta), alogliptin (Nesina), and vildagliptin (Galvus), help increase the proportion of active GLP-1, enhancing insulin secretion. These inhibitors work by competitively binding to DPP-4. This binding causes a significant...

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Related Experiment Video

Updated: May 26, 2026

LDL Cholesterol Uptake Assay Using Live Cell Imaging Analysis with Cell Health Monitoring
08:45

LDL Cholesterol Uptake Assay Using Live Cell Imaging Analysis with Cell Health Monitoring

Published on: November 17, 2018

Fluvastatin suppresses native and recombinant human P2X4 receptor function.

Jing Li1, Samuel J Fountain

  • 1Multidisiplinary Centre for Cardiovascular Research, University of Leeds, Leeds, UK.

Purinergic Signalling
|January 7, 2012
PubMed
Summary

Fluzastin and cholesterol depletion suppress the pro-inflammatory P2X4 receptor in monocytes. This action occurs via cholesterol depletion, not by altering the receptor channel

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Cholesterol Efflux Assay
07:54

Cholesterol Efflux Assay

Published on: March 6, 2012

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Last Updated: May 26, 2026

LDL Cholesterol Uptake Assay Using Live Cell Imaging Analysis with Cell Health Monitoring
08:45

LDL Cholesterol Uptake Assay Using Live Cell Imaging Analysis with Cell Health Monitoring

Published on: November 17, 2018

Cholesterol Efflux Assay
07:54

Cholesterol Efflux Assay

Published on: March 6, 2012

Area of Science:

  • Pharmacology
  • Cell Biology
  • Molecular Biology

Background:

  • Statins possess both cholesterol-lowering and anti-inflammatory properties.
  • The precise mechanisms underlying these dual activities remain incompletely understood.
  • The ATP-gated P2X4 receptor is implicated as a pro-inflammatory mediator.

Purpose of the Study:

  • To investigate the effects of fluvastatin and other cholesterol-depleting agents on the human P2X4 receptor.
  • To determine if fluvastatin's anti-inflammatory actions are linked to its cholesterol-depleting effects.
  • To differentiate between cholesterol depletion-mediated effects and direct channel modulation.

Main Methods:

  • Utilized THP-1 monocytes and recombinant human P2X4 receptors.
  • Assessed calcium influx and receptor current density.
  • Employed cholesterol-depleting agents like methyl-beta-cyclodextrin (mβCD) and filipin III.
  • Evaluated P2X4 receptor properties including ATP concentration-response, rundown, and decay kinetics.

Main Results:

  • Fluvastatin and mβCD significantly suppressed P2X4-dependent calcium influx in THP-1 monocytes.
  • These agents did not affect P2Y receptor responses.
  • mβCD and filipin III reduced the current density of recombinant human P2X4 receptors.
  • The P2X2 receptor exhibited insensitivity to cholesterol depletion.
  • Cholesterol depletion did not alter intrinsic P2X4 receptor channel properties.

Conclusions:

  • Fluzastin suppresses P2X4 receptor activity in monocytes primarily through cholesterol depletion.
  • The anti-inflammatory effects of fluvastatin on P2X4 receptors are mediated by alterations in membrane cholesterol, not direct channel modulation.
  • These findings elucidate a mechanism for statin's anti-inflammatory actions related to membrane lipid composition.