mAChR

Muscarinic acetylcholine receptors (mAChRs) are a class of G protein-coupled receptors (GPCRs) found in the central and peripheral nervous systems, as well as in various other tissues and organs throughout the body. These receptors are named after muscarine, a natural alkaloid compound found in certain mushrooms, which was one of the first substances discovered to activate them.

There are five subtypes of muscarinic receptors, designated as M1 through M5, each with distinct tissue distribution and functions. Here's an overview of their roles:

  • M1 Receptors: Predominantly found in the central nervous system, particularly in regions associated with cognitive functions. Activation of M1 receptors is linked to memory and learning.
  • M2 Receptors: Found in the heart, where they play a crucial role in regulating heart rate and cardiac contractility. Activation of M2 receptors slows heart rate and reduces the force of cardiac contractions.
  • M3 Receptors: Present in smooth muscle tissues, such as those in the gastrointestinal tract, urinary bladder, and bronchial airways. Activation of M3 receptors leads to smooth muscle contraction.
  • M4 Receptors: Distributed mainly in the central nervous system and involved in modulating neurotransmitter release. Their role in cognition and neuropsychiatric disorders is of interest.
  • M5 Receptors: Located in certain areas of the brain and implicated in the modulation of dopamine release. Research suggests they may be relevant to Parkinson's disease and addiction.

Muscarinic receptors are activated by the neurotransmitter acetylcholine and play a vital role in regulating a wide range of physiological processes, including heart rate, smooth muscle contraction, glandular secretion, and neurotransmitter release. They are targets for various drugs, including anticholinergic agents, which block their activity, and drugs used to treat conditions like bradycardia and neurodegenerative disorders.

Understanding the functions and regulation of muscarinic acetylcholine receptors is essential for developing therapies that modulate their activity and for advancing our knowledge of how they contribute to various physiological and pathological processes in the body.

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  1. M5 mAChR Antagonist

    VU6036864 is a selective antagonist of the M5 muscarinic acetylcholine receptor (mAChR) with an IC50 of 20 nM for human M5. This compound exhibits over 500-fold selectivity against human M1-4 receptors, making it a valuable tool for studying M5 receptor functions in both in vitro and in vivo settings. VU6036864 is characterized by its ability to penetrate the blood-brain barrier and demonstrate high oral bioavailability, providing a promising avenue for research in neuropharmacology and related fields.
  2. Muscarinic M4 Receptor PAM

    Direclidine is a selective allosteric modulator of the muscarinic acetylcholine M4 receptor, known for its minimal affinity for M1, M2, M3, and M5 receptors. By non-covalently binding to the orthosteric site, Direclidine activates the M4 receptor, leading to the inhibition of acetylcholine release from striatal cholinergic interneurons. This mechanism helps to modulate the dopaminergic system and alleviate psychiatric symptoms linked to excessive dopamine activity. Direclidine is primarily utilized in research exploring neuropsychiatric disorders such as schizophrenia.
  3. Muscarinic Receptor Antagonist

    (R)-Oxybutynin is a potent muscarinic receptor antagonist employed in the investigation of neurogenic bladder dysfunction. This compound exhibits antispasmodic, antimuscarinic, and anticholinergic properties, effectively inhibiting carbachol-induced contractions. It serves as a valuable tool for studying urinary incontinence and related conditions.
  4. nAChR/mAChR Agonist

    Arecoline hydrochloride is a partial agonist of nicotinic and muscarinic acetylcholine receptors (nAChR/mAChR). This psychoactive alkaloid demonstrates stimulation, increased alertness, anxiolytic effects, and possesses anti-parasitic properties. Additionally, Arecoline hydrochloride can induce oxidative stress, making it a valuable compound for research in neuropharmacology and parasitology.
  5. M4 Antagonist

    VU6021625 is a selective antagonist of the M4 muscarinic acetylcholine receptor (mAChR), exhibiting an IC50 of 0.44 nM for human M4 and 57 nM for rat M4. This compound is valuable for studies exploring the role of M4 receptors in neurological processes and potential therapeutic targets for neurodegenerative diseases. Its selectivity and potency make it an important tool for researchers investigating cholinergic signaling pathways.
  6. Anticholinergic Agent

    Penehyclidine is an anticholinergic agent that selectively antagonizes M1 and M3 receptors. This compound is known to activate NF-kB in lung tissue, leading to the inhibition of inflammatory factor release. Penehyclidine demonstrates potential in alleviating pulmonary inflammatory responses, particularly in models of chronic obstructive pulmonary disease (COPD) during mechanical ventilation. Its mechanistic action supports further research in respiratory disorders and inflammatory conditions.
  7. Stable Isotope

    (Rac)-5-Hydroxymethyl Tolterodine-d14 is a deuterium-labeled derivative of (Rac)-5-Hydroxymethyl Tolterodine, a potent muscarinic acetylcholine receptor (mAChR) antagonist. It exhibits high affinity with Ki values of 2.3 nM, 2 nM, 2.5 nM, 2.8 nM, and 2.9 nM for M1, M2, M3, M4, and M5 receptors, respectively. This stable isotope is instrumental in studies related to overactive bladder syndrome and facilitates pharmacokinetic research by enabling sensitive detection and quantification in biological samples.
  8. Stable Isotope

    Tiotropium-d3 bromide is a deuterium-labeled variant of Tiotropium bromide, a selective antagonist of muscarinic acetylcholine receptors (mAChRs). By inhibiting acetylcholine binding, it prevents the opening of ligand-gated ion channels, leading to bronchial dilation. This compound is primarily used in pharmacological studies related to respiratory disorders and can be utilized in isotopic labeling experiments to investigate drug metabolism and pharmacokinetics.
  9. M2/4 Muscarinic Receptor Antagonist

    TD-6301 is a potent antagonist of the M2 and M4 muscarinic receptors, demonstrating high selectivity and strong affinity for the human M2 receptor (Ki = 0.36 nM). This compound effectively inhibits volume-induced bladder contractions (ID50 = 0.075 mg/kg), making it a valuable tool in the study of overactive bladder conditions. Its specificity for bladder tissues presents opportunities for targeted therapeutic research in urology and related fields.
  10. M4 mAChR Modulator

    VU6016235 is a selective positive allosteric modulator of the M4 muscarinic acetylcholine receptor (mAChR). It demonstrates notable in vivo inhibitory potency in animal models of psychosis, indicating potential therapeutic applications in neuropsychiatric disorders. This compound may be valuable for researchers investigating the modulation of cholinergic signaling and its effects on behavior and cognition.
  11. Antimuscarinic

    Telenzepine is an antimuscarinic agent that selectively targets muscarinic receptors, demonstrating binding affinities with Kis of 0.94 nM for M1 mAChR and 17.8 nM for M2 mAChR. It effectively inhibits synaptic transmission induced by muscarinic or M1 receptor agonists, resulting in a reduction of extracellular slow excitatory postsynaptic potentials with an EC50 of 38 nM and slow inhibitory postsynaptic potentials with an EC50 of 253 nM. This compound is valuable for research in neuropharmacology and the study of cholinergic signaling pathways.
  12. Precursor of Triazolobenzodiazepines

    Desalkylquazepam, a precursor in the synthesis of triazolobenzodiazepines, is recognized for its role as a mAChR modulator with an EC50 value of 0.317 µM. This compound is utilized in research related to the development of therapeutic agents targeting benzodiazepine receptors. Its biological activity makes it a valuable reagent for studies exploring anxiety, sedation, and other central nervous system disorders.
  13. mAChR Antagonist

    L-Hyoscyamine sulfate hydrate is a potent and competitive antagonist of muscarinic acetylcholine receptors (mAChR). As a naturally occurring tropane alkaloid, it exhibits significant biological activity by inhibiting mAChR-mediated signaling pathways. This compound is primarily utilized in pharmacological research and studies related to the modulation of synaptic transmission, making it valuable for investigating various physiological and pathological processes.
  14. M4 mAChR Positive Allosteric Modulator

    VU6002703 is a positive allosteric modulator (PAM) of the M4 muscarinic acetylcholine receptor (mAChR), exhibiting an EC50 of 0.6 μM for human M4. This compound is designed for research into neuropsychiatric disorders and rare genetic conditions affecting the central nervous system (CNS). Its ability to penetrate the blood-brain barrier makes it a valuable tool for studying the modulation of cholinergic signaling in various models of CNS diseases.
  15. Muscarinic Receptor Antagonist

    Solifenacin D5 hydrochloride is a deuterium-labeled derivative of Solifenacin hydrochloride, acting as a muscarinic receptor antagonist. With pKis of 7.6, 6.9, and 8.0 for M1, M2, and M3 receptors respectively, it is effective in modulating receptor activity. This compound is primarily utilized in pharmacological research related to bladder control and the treatment of overactive bladder conditions.
  16. Muscarinic Acetylcholine Receptor Enhancer

    VU6007678 is a muscarinic acetylcholine receptor enhancer that primarily acts as a potentiator of acetylcholine signaling. This compound enhances receptor activity at human M1, M3, and M5, as well as rat M1, M3, M4, and M5 muscarinic acetylcholine receptors. VU6007678 is a valuable tool for research investigations into Alzheimer's disease, schizophrenia, and ischemic stroke, facilitating studies of cognitive function and neuropharmacology.
  17. M2 mAChR Ligand

    Bibn 140 is a pyridine derivative that acts as a selective antagonist of the M2 muscarinic acetylcholine receptor (mAChR), exhibiting high affinity with a Ki value of 12 nM. This compound is primarily utilized in research exploring cholinergic signaling and its implications in neurological disorders. Its specificity for the M2 subtype over the M1 receptor positions it as a valuable tool for studying M2 receptor-related biological processes.
  18. Muscarinic Receptor Agonist

    Milameline hydrochloride is a nonselective, partial agonist of muscarinic receptors, demonstrated to enhance cognitive function. It exhibits comparable affinity across various human muscarinic receptor subtypes, with IC50 values of 1.3 µM for M1, 1.1 µM for M2, 1.5 µM for M3, and 1.9 µM for M4 receptors. Milameline hydrochloride produces both central and peripheral cholinergic effects and effectively reverses cognitive deficits induced by scopolamine. This compound serves as a valuable tool for research related to Alzheimer's disease and cognitive impairment.
  19. mAChR Antagonist

    (S)-Vamicamide is a selective antagonist of the muscarinic acetylcholine receptors (mAChRs). This compound exhibits notable anticholinergic activity, making it useful for studies related to neurotransmission and receptor signaling pathways. Its application extends to research in conditions influenced by cholinergic modulation, such as cognitive disorders and movement disorders.
  20. Stable Isotope

    Pirenzepine-d8 dihydrochloride is a deuterium-labeled derivative of Pirenzepine, a selective antagonist of the M1 muscarinic acetylcholine receptor (mAChR). This compound exhibits significant biological activity by inhibiting gastric acid secretion and alleviating muscle spasms, making it valuable for research in peptic ulcers. Additionally, Pirenzepine-d8 demonstrates anti-proliferative effects in cancer cell lines, contributing to its use in cancer research applications.
  21. M1/M4 Muscarinic Agonist

    M1/M4 Muscarinic Agonist 3 is a selective agonist for the M1 and M4 muscarinic acetylcholine receptors (mAChRs), exhibiting EC50 values of 31 nM and 9.3 nM, respectively. This compound is instrumental in the investigation of cholinergic signaling pathways and has potential applications in neurological research, particularly in the study of cognitive function and memory modulation. Its efficacy in activating M1/M4 receptors makes it a valuable tool for studying muscarinic receptor pharmacology.
  22. mAChR Antagonist

    Vamicamide is a competitive antagonist of muscarinic acetylcholine receptors (mAChRs) that functions by inhibiting the binding of mAChR agonists, thereby preventing contractions induced by cholinergic nerve stimulation. It demonstrates significant anti-bladder spasm effects, exhibiting a pA2 value of 6.82 in bladder tissue. Vamicamide is valuable for research in the study of neurological diseases and disorders related to bladder dysfunction.
  23. Muscarinic M3 Antagonist

    AZD-9164 bromide is a long-acting antagonist of the muscarinic M3 receptor. It demonstrates significant potential for modulating airway smooth muscle contraction and has applications in the study of respiratory diseases, including chronic obstructive pulmonary disease (COPD) and asthma. Researchers may utilize AZD-9164 bromide to explore mechanisms underlying bronchoconstriction and to develop targeted therapies for these conditions.
  24. M1-mAChR Agonist

    HTL-9936 is a selective agonist of the M1 muscarinic acetylcholine receptor (M1-mAChR), which plays a crucial role in cognitive function and memory. This compound demonstrates potential therapeutic effects in the context of neurodegenerative disorders, particularly Alzheimer's disease. HTL-9936 is a valuable tool for researchers investigating cholinergic signaling pathways and developing novel treatments for cognitive decline.
  25. Muscarinic Receptor Blocker

    Ethybenztropine is a muscarinic receptor blocker, functioning primarily as an anticholinergic agent. It inhibits the action of acetylcholine at muscarinic receptors, thereby exerting antihistaminergic effects. This compound is utilized in research applications that explore cholinergic signaling pathways and the role of muscarinic receptors in various biological processes.
  26. Cholinergic Receptor

    L-(-)-Neopterin (L-erythro-Neopterin) is a competitive antagonist of cholinergic receptors, mitigating the inhibitory effects of pteridine diuretics on the growth of Crithidia fasciculata. This compound is valuable in studies investigating nervous system functions and purine metabolism, providing insights into neurochemical pathways and potential therapeutic applications.
  27. M1 Positive Allosteric Modulator

    VU6052254 is a selective, potent positive allosteric modulator of the muscarinic M1 acetylcholine receptor, exhibiting an EC50 of 59 nM. This compound demonstrates no activity on M2-5 receptors, ensuring specificity in its mechanism of action. VU6052254 enhances memory recognition and effectively reverses cognitive impairments induced by scopolamine at a minimum effective dose of 1 mg/kg. It is a valuable tool for researching neurological disorders, including Alzheimer's disease, facilitating investigations into cognitive enhancement strategies.
  28. Muscarinic Receptor Blocker

    Ethybenztropine hydrobromide is a muscarinic receptor blocker with notable antiparkinsonian activity. This anticholinergic agent functions to alleviate symptoms associated with Parkinson's disease, potentially enhancing dopaminergic signaling by acting as a dopamine reuptake inhibitor. It is widely utilized in research exploring therapeutic strategies for managing Parkinson’s disease and related movement disorders.
  29. mAChR Agonist

    (Rac)-Sabcomeline is a selective agonist for M1 and M4 muscarinic acetylcholine receptors (mAChRs), providing a valuable resource for investigating neurological disorders, particularly schizophrenia. Its activation of mAChRs can facilitate insights into cholinergic signaling pathways and their implications in neuropsychiatric conditions. This compound supports research into the development of therapeutic strategies targeting muscarinic receptors in the treatment of various cognitive and mood disorders.
  30. Muscarinic M3 Receptor Antagonist

    Muscarinic M3 receptor antagonist-2 is a selective antagonist of the muscarinic M3 receptor, crucial in mediating various physiological responses. This compound demonstrates potency in inhibiting M3 receptor activity, making it valuable for research into disorders related to cholinergic signaling and smooth muscle contraction. Its application is particularly relevant in studies focused on airway diseases, gastrointestinal motility, and other conditions associated with M3 receptor dysregulation.
  31. M1 Receptor Agonist

    Lu AE51090 is a selective agonist of the muscarinic M1 receptor, designed to penetrate the blood-brain barrier. This compound activates the human M1 receptor with an EC50 of 61 nM and demonstrates minimal activity at M2 to M5 receptors. Lu AE51090 has been shown to produce procognitive effects in murine models and is relevant for research into Alzheimer’s disease and cognitive impairments associated with schizophrenia.
  32. M1 mAChR Positive Allosteric Modulator

    M1 mAChR modulator-1 is a positive allosteric modulator of the muscarinic M1 receptor (mAChR1). It enhances gastrointestinal motility and facilitates defecation in mouse models, exhibiting low permeability to the central nervous system. This compound is valuable for research focused on gastrointestinal disorders, particularly constipation.
  33. M3 mAChR Antagonist

    YM-58790 free base is a potent antagonist of the muscarinic acetylcholine receptors (mAChR), specifically targeting the M3 subtype with a Ki value of 15 nM, along with M1 and M2 subtypes at 28 nM and 260 nM, respectively. This compound demonstrates significant inhibitory effects on bladder pressure during reflexly-evoked rhythmic contractions in rat studies. YM-58790 free base is used in research focused on neuropharmacology and the modulation of cholinergic signaling pathways, particularly in relation to bladder function and potential therapeutic applications in urological disorders.
  34. Anticholinergic Agent

    Homatropine hydrochloride is an anticholinergic agent that primarily targets muscarinic acetylcholine receptors. It effectively induces pupil dilation and exerts cycloplegic effects, making it valuable in ophthalmologic studies. Additionally, it demonstrates antitussive properties, contributing to research in respiratory conditions. This compound is suitable for investigations into eye diseases and cough-related disorders.
  35. mAChR Agonist

    Arecaidine-propargyl ester tosylate acts as a potent agonist of muscarinic acetylcholine receptors (mAChR). Its primary biological activity includes stimulation of mAChR, which is critical for neuropharmacological research and studies related to the central nervous system. This compound is useful for exploring the role of muscarinic signaling in various physiological processes and developing potential therapeutic strategies targeting mAChR pathways.
  36. Muscarinic Acetylcholine Receptor M3 Antagonist

    Muscarinic M3 receptor antagonist-1 functions as an antagonist of the muscarinic acetylcholine receptor M3. It plays a crucial role in the study of inflammatory and obstructive airway diseases, providing insights into potential therapeutic interventions. This reagent aids in the exploration of M3 receptor-mediated pathways and their implications in respiratory conditions.
  37. Muscarinic Antagonist

    Tiquizium bromide is a nonselective muscarinic antagonist that acts as an atropine-type spasmolytic agent. It effectively inhibits the development of gastric and duodenal lesions, while also inducing mydriasis and reducing salivation induced by pilocarpine. This compound is useful in pharmacological studies aimed at exploring muscarinic receptor modulation and its physiological effects.
  38. mAChR Inhibitor

    (Rac)-Sabcomeline hydrochloride is a selective agonist of the M1 muscarinic acetylcholine receptor (mAChR). It exhibits potential neuroprotective effects and is of significant interest in research related to Alzheimer's disease and cognitive disorders. This compound is utilized in studies aimed at understanding the role of muscarinic receptors in synaptic plasticity and memory function.
  39. M1 Receptor Agonist

    Tazomeline is a selective agonist of the M1 muscarinic receptor, demonstrating significant inhibitory effects on twitch height in the rabbit vas deferens with an IC50 of 0.001 nM. This compound is primarily utilized in research focused on neuropsychiatric disorders, offering insights into the modulation of cholinergic signaling and potential therapeutic applications.
  40. mAChR Modulator

    (E/Z)-VU0029767 is an allosteric modulator of M1 muscarinic acetylcholine receptors (mAChRs), enhancing receptor activity by increasing agonist affinity. This compound exhibits distinct properties across various experimental conditions, including its interaction with mutant M1 receptors and effects on downstream signaling pathways. (E/Z)-VU0029767 is employed in research to explore mAChR function and develop therapeutic strategies targeting related neurological disorders.
  41. mAChR Antagonist

    Parapenzolate bromide is an orally active antagonist of muscarinic acetylcholine receptors (mAChRs). As an anticholinergic agent, it demonstrates antispasmodic properties, making it useful for studies related to gastrointestinal motility and smooth muscle relaxation. This compound is valuable in research applications focusing on the modulation of cholinergic signaling and its effects on various physiological processes.
  42. M1 Receptor Antagonist

    Trihexyphenidyl is a selective M1 muscarinic receptor antagonist, with an IC50 of 3.7 nM for rat cerebral cortex M1 receptors. It modulates cholinergic activity, effectively countering acetylcholine supersensitivity in neural pathways. Trihexyphenidyl is utilized in research for Parkinson's disease and demonstrates efficacy in improving movement disorders, as well as inhibiting vagally-induced bradycardia and vasodilation. Its inhibition of McN-A-343-induced pressor responses highlights its potential in studying neurophysiological effects.
  43. Muscarinic Receptor Ligand

    Emepronium bromide is a muscarinic receptor ligand that acts as an antispasmodic agent for the bladder, exhibiting an IC50 of 236 nM. This compound is valuable for research focused on bladder diseases, allowing for the exploration of muscarinic receptor mechanisms and the development of therapeutic strategies targeting bladder dysfunction.
  44. M3 Antagonist

    MK-0969 is an M3 muscarinic acetylcholine receptor antagonist. It exhibits biological activity relevant to the modulation of smooth muscle tone, making it useful in the study of conditions such as chronic obstructive pulmonary disease and urinary incontinence. Researchers can employ MK-0969 to investigate the therapeutic potential of M3 receptor inhibition in respiratory and urological disorders.
  45. Anticholinergic Agent

    Ilmetropium iodide is an anticholinergic agent that selectively antagonizes M-cholinergic receptors in bronchial smooth muscle. This selective blockade effectively reduces or prevents bronchoconstriction triggered by cholinergic stimuli and various bronchospasm-inducing factors. With a superior strength and selectivity compared to other anticholinergics, ilmetropium iodide is a valuable tool in respiratory research and the development of novel therapeutic strategies for conditions like asthma and COPD.
  46. mAChR Antagonist

    Sintropium bromide is a muscarinic acetylcholine receptor (mAChR) antagonist that exerts notable anticholinergic effects. Its primary biological activity includes alleviating pain and reducing muscle spasms, making it a valuable tool for research in pain management and neuromuscular studies.
  47. M1 muscarinic/σ1 Receptor Agonist

    (Rac)-AF710B is a potent allosteric agonist targeting M1 muscarinic and σ1 receptors. This compound exhibits selective interactions that are valuable for elucidating the role of these receptors in neurological pathways. Its application in research focuses primarily on Alzheimer's disease, making it a significant reagent for studying potential therapeutic strategies.
  48. M4 mAChR PAM

    VU6009453 is a positive allosteric modulator (PAM) of the M4 muscarinic acetylcholine receptor (mAChR), exhibiting an EC50 of 383 nM. This compound effectively enhances M4 receptor activity and is valuable for research focused on neurological disorders. Its ability to penetrate the blood-brain barrier makes it a pertinent tool in studies investigating potential therapeutic strategies for conditions related to M4 mAChR function.
  49. Muscarinic Receptor Ligand

    PTAC oxalate is a selective ligand for muscarinic receptors, functioning as a partial agonist at M2 and M4 receptors while acting as an antagonist at M1, M3, and M5 receptors, with Ki values ranging from 0.2 to 2.8 nM in CHO cells. This compound demonstrates significant biological activity by alleviating mechanical allodynia associated with neuropathic pain and exhibiting potential antidepressant effects. PTAC oxalate serves as a valuable tool for research into muscarinic receptor function and the development of therapeutics for pain and mood disorders.
  50. Antimuscarinic Agent

    Prifinium bromide is an antimuscarinic agent that acts by selectively inhibiting muscarinic acetylcholine receptors. It exhibits antispasmodic and antiemetic effects, making it useful in the management of gastrointestinal disorders. This compound is relevant for research applications involving smooth muscle relaxation and the modulation of vomiting reflex pathways.

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