Cholinergic Ligands
Cholinergic Ligands - Related Videos
02:40
Ligand Binding Sites
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2020
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands. Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
14:39
Cholinergic Ligand–dependent Modulation of Oxidative Phosphorylation Coupling in Digitonin-permeabilized BE(2)-C Neuroblastoma Cells
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2026
We present a protocol to selectively permeabilize plasma membrane, enabling targeted delivery of substrates and inhibitors to assess mitochondrial oxidative phosphorylation (OXPHOS) in cultured cells, overcoming plasma membrane transport barriers that typically hinder such analysis. Using this technique, we demonstrated how OXPHOS function is modulated by muscarinic agonists and antagonists.
02:51
Metal-Ligand Bonds
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2020
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes. In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
00:49
Ligand Binding and Linkage
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2020
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
01:26
Cholinergic Antagonists: Therapeutic Uses
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2023
Antimuscarinic drugs have various therapeutic applications by inhibiting parasympathetic stimulation in different systems. Here are the key therapeutic uses of antimuscarinics: Respiratory Tract: Ipratropium, aclidinium, and tiotropium treat asthma, chronic bronchitis, and chronic obstructive pulmonary disease (COPD). They protect against bronchoconstriction caused by irritants like cigarette smoke, sulfur dioxide, and ozone. They also help reduce nasopharyngeal secretions in common...
FAQs
Their effects reflect the distinct signaling architecture of the receptors they engage. Nicotinic receptor actions are associated with rapid cation-channel opening, whereas muscarinic receptor actions proceed through G protein signaling and intracellular pathways on a slower timescale. Comparing these responses helps investigators separate fast ionotropic transmission from more gradual metabotropic regulation in neural circuits.
Selective ligand actions allow researchers to attribute an observed neural effect to particular cholinergic receptor subtypes rather than to acetylcholine signaling as a whole. This distinction is important because nicotinic and muscarinic receptors support different mechanisms. Subtype-focused experiments can therefore clarify which receptor populations contribute to circuit activity, behavior, or physiological regulation.
An activating ligand is used to enhance signaling through its targeted cholinergic receptor, while a blocking ligand is used to prevent or reduce signaling through that receptor. Comparing these opposing manipulations helps test whether a response depends on cholinergic activity. The resulting contrast can also help identify receptor subtype contributions to a neural process.
Researchers apply ligands with selective actions to distinguish receptor subtypes and trace the functional contribution of acetylcholine-dependent pathways. Their effects can be examined in relation to circuit activity or associated neural functions. This approach helps map where cholinergic signaling participates and clarifies whether a circuit relies primarily on rapid nicotinic mechanisms or slower muscarinic regulation.
Cholinergic ligands support investigations of attention, learning, and memory, as well as autonomic regulation. By selectively modifying receptor-mediated signaling, researchers can examine how acetylcholine-dependent mechanisms contribute to each function. These experiments connect receptor-level actions with broader neural and physiological processes, helping define the roles of cholinergic circuits in behavior and regulation.
Their selective actions provide a way to examine how altered cholinergic signaling may contribute to neurological disorders. The same experimental control can guide efforts to develop therapies that modify specific cholinergic pathways rather than changing acetylcholine-related signaling indiscriminately. Consequently, these ligands connect basic receptor research with investigations of disease mechanisms and therapeutic strategies.