Et-a Receptor
Et-a Receptor - Related Videos
12:03
Receptor Autoradiography Protocol for the Localized Visualization of Angiotensin II Receptors
0 Views •
Cited by 14 •
2016
Here we present a protocol to describe the localization of angiotensin II Type 1 receptors in the rat brain by quantitative, densitometric, in vitro receptor autoradiography using an iodine-125 labeled analog of angiotensin II.
12:02
High-throughput Analysis of Mammalian Olfactory Receptors: Measurement of Receptor Activation via Luciferase Activity
0 Views •
Cited by 16 •
2014
Olfactory receptor activation patterns encode odor identity, but the lack of published data identifying odorant ligands for mammalian olfactory receptors hinders the development of a comprehensive model of odor coding. This protocol describes a method to facilitate high-throughput identification of olfactory receptor ligands and quantification of receptor activation.
01:07
Types of Receptors: Internal Receptors
0 Views •
2023
Many cellular signals are hydrophilic and cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind intracellular receptors that reside within the cell cytoplasm or nucleus. Many mammalian steroid hormones and nitric oxide (NO) gas use this cell signaling mechanism. Similar to membrane-bound receptors, the binding of a ligand to the intracellular receptor of causes a conformational change in the...
06:01
Extracellular Protein Microarray Technology for High Throughput Detection of Low Affinity Receptor-Ligand Interactions
0 Views •
Cited by 4 •
2019
Here, we present a protocol to screen extracellular protein microarrays for identification of novel receptor-ligand interactions in high throughput. We also describe a method to enhance detection of transient protein-protein interactions by using protein-microbead complexes.
01:28
Types of Receptors: Cell Surface Receptors
0 Views •
2023
Cell-surface receptors, also known as transmembrane receptors, are cell surface, membrane-anchored (integral) proteins that bind to external ligand molecules. This type of receptor spans the plasma membrane and performs signal transduction, converting an extracellular signal into an intracellular signal. Ligands that interact with cell-surface receptors do not have to enter the cell that they affect. Cell-surface receptors are also called cell-specific proteins or markers because they are...
FAQs
This pathway links receptor activation to two intracellular messengers, inositol trisphosphate and diacylglycerol. Their formation increases intracellular calcium, providing a mechanistic explanation for how endothelin-1 signaling produces smooth-muscle contraction. In pharmacology, tracing these steps helps connect molecular receptor activity with changes in vascular tone and supports evaluation of drugs that interrupt endothelin-driven responses.
Activation promotes contraction of vascular smooth muscle through increased intracellular calcium. This response can alter vascular tone, making the receptor relevant to cardiovascular regulation and vascular disease research. The same signaling system is also examined in relation to remodeling, so studies may consider both the immediate contractile effect and longer-term structural consequences of endothelin activity.
Selective ET-A antagonists are designed to reduce signaling driven through this receptor rather than broadly reproducing or enhancing endothelin effects. Their importance follows from the receptor’s contribution to vasoconstriction and remodeling. Pharmacology studies use them to test whether blocking ET-A activity can lessen endothelin-dependent vascular responses and to investigate the receptor as a therapeutic target.
Vasoconstriction refers to the immediate functional change in smooth-muscle tone, whereas remodeling describes a broader change in the vessel associated with endothelin signaling. Separating these outcomes helps clarify whether an intervention mainly reduces acute contraction, influences longer-term vascular changes, or addresses both. This distinction is particularly relevant when evaluating receptor-targeted drug mechanisms.
A study can begin by examining endothelin-1-driven receptor signaling, then follow downstream messenger formation and the associated smooth-muscle response. Investigators may next assess how a selective ET-A antagonist changes vasoconstriction or remodeling-related outcomes. This sequence connects receptor engagement, intracellular mechanism, physiological effect, and pharmacological intervention without treating any single measurement as the complete response.
The receptor is studied in cardiovascular regulation, vascular disease, and pulmonary arterial hypertension. These areas reflect its connection to vascular tone, smooth-muscle function, and endothelin-associated remodeling. Within drug-development research, ET-A signaling provides a framework for investigating selective antagonists, understanding their mechanisms, and determining whether reducing endothelin-driven activity has therapeutic value.