Calcium Agonists
Calcium Agonists - Related Videos
06:26
Monitoring Dynamic Changes In Mitochondrial Calcium Levels During Apoptosis Using A Genetically Encoded Calcium Sensor
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Cited by 10 •
2011
This protocol describes a method for real-time measurement of mitochondrial calcium fluxes by fluorescent imaging. The method takes advantage of a circularly permutated YFP-based dual-excitation ratiometric calcium sensor (ratiometric pericam-mt) selectively expressed in mitochondria.
11:45
Quantifying Agonist Activity at G Protein-coupled Receptors
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Cited by 10 •
2011
A method for estimating the affinity constant of an agonist for the active state (Kb) of a G protein-coupled receptor is described. The analysis provides absolute or relative measures of Kb depending on whether constitutive receptor activation is measurable. Our method applies to various responses downstream from receptor activation.
01:24
Glucagon-like Receptor Agonists
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2024
Incretins include glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), which stimulate insulin secretion post-meals. In type 2 diabetes, GIP's efficacy is reduced, making GLP-1 a viable drug target. GIP originates from preproGIP. GLP-1, when administered in high doses intravenously, triggers insulin secretion, inhibits glucagon release, slows gastric emptying, reduces food intake, and restores normal insulin secretion. However, its rapid inactivation by the...
01:30
Adrenergic Agonists: Therapeutic Uses
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2023
Adrenergic agonists have diverse therapeutic uses across various medical conditions and emergencies. Emergency and Intensive Care Unit (ICU) applications: Pressor agents increase blood pressure, heart rate, and contractility in shock and organ failure situations. Dopamine can induce vasodilation and stimulate adrenoceptors. Endogenous catecholamines are effective in treating cardiogenic shock. α2-agonists like clonidine can reverse anesthesia-induced hypertension. Allergies and anaphylaxis:...
02:07
Stimulation of Dorsal Root Ganglion Sensory Neurons Using a Neuropeptide Receptor Agonist
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2025
This video demonstrates the use of transfected dorsal root ganglion cells to study neurotransmitter release by stimulating them with a neuropeptide receptor agonist.
FAQs
The cellular outcome depends on which step of calcium handling an agent influences. A compound that activates a calcium-permeable ion channel promotes Ca2+ entry, whereas one that imitates calcium acts at a calcium-responsive protein. These routes can produce different downstream changes in membrane excitability, enzyme activity, secretion, or contraction, helping researchers connect signaling location with function.
An increase in intracellular Ca2+ is not itself the whole experimental result; its significance depends on how it was produced. Entry through an activated channel points to membrane-associated signaling, while protein mimicry tests calcium responsiveness at a target. Comparing these routes can help separate effects caused by calcium entry from those caused by activation of calcium-sensitive machinery.
Researchers can apply an agonist and then examine a calcium-dependent response such as secretion, contraction, enzyme activity, or altered membrane excitability. If the response changes alongside intracellular Ca2+, the agent provides evidence that calcium signaling participates in that process. This approach helps map a pathway from calcium elevation to a measurable cellular function rather than treating calcium as an isolated signal.
A useful workflow begins by choosing the calcium-signaling route relevant to the question, then exposing the biological system to the compound and monitoring a response linked to Ca2+. The measured outcome may be secretion, contraction, enzyme activity, or excitability. Researchers can use the result to test a pathway, compare cellular responses, and identify calcium-dependent stages.
Calcium agonists are especially informative in studies of neurotransmitter release, muscle function, and cellular adaptation. In these settings, researchers can ask how a calcium-dependent signal changes communication, contraction, or adjustment to cellular conditions. The compounds therefore connect molecular calcium handling with observable biological behavior, making them useful across cellular and physiological questions within biology.
These compounds support disease-oriented research by helping investigators examine what happens when calcium regulation is disrupted. By increasing or imitating calcium signaling, they can be used to test whether altered calcium-dependent activity affects secretion, contraction, enzyme activity, or excitability. Such experiments do not by themselves identify a disease mechanism, but they can clarify which calcium-linked responses warrant further study.