Vasodilation Mechanisms
Vasodilation Mechanisms - Related Videos
07:46
Assessing Endothelial Vasodilator Function with the Endo-PAT 2000
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Cited by 165 •
2010
A noninvasive procedure to assess endothelial function is demonstrated using the Endo-PAT 2000.
08:09
Vasodilation of Isolated Vessels and the Isolation of the Extracellular Matrix of Tight-skin Mice
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Cited by 1 •
2017
We describe the isolation of cardiac extracellular matrix from C57Bl/6J control mice, tight-skin mice, and tight-skin mice treated with the IRF5 inhibitory peptide. We also describe the vasodilation studies on the isolated vessels from C57Bl/6J, tight-skin mice and tight-skin mice treated with the IRF5 inhibitory peptide.
01:23
Antihypertensive Drugs: Vasodilators
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2024
Vasodilators, primarily affecting the smooth muscles within arterial and venous walls, are commonly used for hypertension treatment. Medications such as minoxidil and hydralazine primarily target arteries and arterioles, while sodium nitroprusside acts on arterioles and venules. Minoxidil, functioning as a prodrug, is metabolized by hepatic sulfotransferase into its active form, minoxidil sulfate, after oral administration. This metabolite binds to the sulfonylurea receptor (SUR) component of...
12:45
Mechanical Stimulation of Chondrocyte-agarose Hydrogels
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Cited by 29 •
2012
The biosynthesis of cartilaginous extracellular matrix by chondrocytes can be affected by application of mechanical stimuli. This method describes the technique of applying dynamic compressive strains to chondrocytes encapsulated in 3D constructs and the evaluation of induced changes in chondrocyte metabolism.
10:28
Evaluation of Vascular Control Mechanisms Utilizing Video Microscopy of Isolated Resistance Arteries of Rats
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2017
This manuscript describes in vitro video microscopy protocols for evaluating vascular function in rat cerebral resistance arteries. The manuscript also describes techniques for evaluating microvessel density with fluorescently labeled lectin and tissue perfusion using Laser Doppler Flowmetry.
FAQs
Nitric oxide activates guanylyl cyclase in vascular smooth muscle, increasing cyclic GMP production. This signaling pathway promotes relaxation, which can reduce vascular resistance and change tissue blood flow. Its pharmacological importance lies in linking a defined intracellular messenger, cyclic GMP, with the vascular effects targeted by drugs used in circulatory disorders.
Increased cyclic AMP signaling and reduced intracellular calcium both favor relaxation of vascular smooth muscle. Because contraction depends on the contractile state of this muscle, changing these signals can alter vessel diameter and resistance. These mechanisms give pharmacologists more than one intracellular route for influencing blood pressure and tissue perfusion.
Contractile receptors promote signals that maintain vascular smooth muscle contraction. Inhibiting those receptors reduces this contractile influence, allowing the vessel to relax and lowering vascular resistance. This mechanism differs from directly increasing cyclic GMP or cyclic AMP because it acts by blocking a receptor-mediated contractile pathway rather than primarily enhancing a relaxation signal.
Nitrates, calcium channel blockers, potassium channel activators, and alpha-adrenergic antagonists represent distinct pharmacological approaches. Their differences reflect the pathway or target they influence, including cyclic GMP signaling, calcium-related contraction, potassium channel activity, or contractile receptor action. Comparing these targets helps researchers anticipate how each class may affect vascular resistance and perfusion.
These mechanisms are relevant when altered vascular resistance or tissue perfusion contributes to disease. Pharmacological strategies targeting them support treatment of hypertension, angina, heart failure, and circulatory disorders. The appropriate mechanism matters because changing vessel relaxation can influence both systemic blood pressure and the delivery of blood to tissues.
Researchers examine how a targeted pathway changes blood pressure, vascular resistance, and tissue perfusion. They also consider adverse responses that may accompany altered vessel relaxation. This outcome-based view connects molecular signaling, such as cyclic GMP or cyclic AMP activity, with clinically important effects and helps assess the usefulness of pharmacological interventions.