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Related Concept Videos

Regulation of the Cardiovascular System01:27

Regulation of the Cardiovascular System

The regulation of the cardiovascular system allows the body to adapt to various demands and maintain homeostasis.
The regulation of the cardiovascular system involves the autonomic nervous system (ANS), baroreceptors, and chemoreceptors, ensuring that heart rate and blood pressure are appropriately modulated in response to varying physiological demands.
The ANS comprises two main divisions: the sympathetic and parasympathetic nervous systems. The sympathetic nervous system enhances...
Antihypertensive Drugs: Action of Calcium Channel Blockers01:18

Antihypertensive Drugs: Action of Calcium Channel Blockers

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,...
G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
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Antihypertensive Drugs: Angiotensin II Receptor Blockers01:30

Antihypertensive Drugs: Angiotensin II Receptor Blockers

In the renin-angiotensin-aldosterone system, a hormone called angiotensin II plays a crucial role. It binds to the AT1 receptors in vascular smooth muscles coupled with Gq proteins. The activation of these receptors activates an enzyme called phospholipase C, which releases two molecules: inositol trisphosphate and diacylglycerol. These molecules cause a chain reaction that leads to the phosphorylation of myosin light chains and promotes interaction between actin and myosin, leading to smooth...
Adrenergic Receptors: β Subtype01:26

Adrenergic Receptors: β Subtype

β-adrenoceptors have varied sensitivities towards adrenaline, noradrenaline, and isoprenaline. The order of agonist potency is as follows:
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Antihypertensive Drugs: Direct Renin Inhibitors01:25

Antihypertensive Drugs: Direct Renin Inhibitors

The renin-angiotensin-aldosterone system (RAAS) is an intricate physiological pathway involving numerous enzymes and hormones, including renin, angiotensin-converting enzyme (ACE), angiotensin I and II, and aldosterone. Imbalances within this system increase the production of angiotensin II and aldosterone. Increased angiotensin II levels promote vasoconstriction and blood pressure elevation. Concurrently, higher aldosterone levels stimulate sodium and water reabsorption in the kidneys,...

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Related Experiment Video

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Monitoring GPCR-&#946;-arrestin1/2 Interactions in Real Time Living Systems to Accelerate Drug Discovery
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Monitoring GPCR-β-arrestin1/2 Interactions in Real Time Living Systems to Accelerate Drug Discovery

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Arrestins in the cardiovascular system.

Anastasios Lymperopoulos1, Ashley Bathgate

  • 1Department of Pharmaceutical Sciences, Nova Southeastern University College of Pharmacy, Fort Lauderdale, Florida, USA.

Progress in Molecular Biology and Translational Science
|June 15, 2013
PubMed
Summary
This summary is machine-generated.

Beta-arrestins (βarrs), Arrestin2 and -3, are key regulators of cardiovascular G-protein-coupled receptors (GPCRs). Their roles in cardiovascular homeostasis are explored, including effects on various cell types and organs.

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Area of Science:

  • Cardiovascular Physiology
  • Molecular Pharmacology
  • GPCR Signaling

Background:

  • Beta-arrestins (βarrs), specifically Arrestin2 and Arrestin3, are the primary arrestin isoforms expressed in the cardiovascular system.
  • They play crucial roles in regulating cardiovascular homeostasis by modulating G-protein-coupled receptors (GPCRs).
  • βarrs function as both desensitizers/internalizers and signal transducers for critical cardiovascular GPCRs.

Purpose of the Study:

  • To summarize current knowledge on cardiovascular βarr physiology and pharmacology.
  • To detail the specific cardiovascular receptors regulated by βarrs in vivo.
  • To elucidate the cellular and organ-level effects of βarrs within the cardiovascular system.

Main Methods:

  • Utilizing knockout mouse models to study βarr function.
  • Employing siRNA knockdown techniques to assess βarr roles.
  • Analyzing data from artificial or naturally occurring polymorphic GPCRs.
  • Investigating the impact of novel βarr-biased GPCR ligands.

Main Results:

  • βarrs influence a range of cardiovascular GPCRs essential for homeostasis.
  • Effects of βarrs are observed in diverse cardiovascular cell types, including cardiac myocytes, fibroblasts, vascular smooth muscle cells, adrenal glands, and platelets.
  • The study provides a comprehensive overview of βarr involvement across cardiovascular tissues.

Conclusions:

  • βarrs are critical regulators of cardiovascular function through their interaction with GPCRs.
  • Understanding βarr physiology and pharmacology is vital for cardiovascular health.
  • The concept of βarr bias in GPCR ligands offers new therapeutic avenues.