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M4 receptor

Family: Acetylcholine receptors (muscarinic)

Contents:
Gene and Protein Information
Previous and Unofficial Names
Database Links
Agonists
Antagonists
Allosteric Regulators
Transduction Mechanisms
Tissue Distribution
Expression Datasets
Functional Assays
Physiological Functions
Physiological Consequences of Altering Gene Expression
Phenotypes, Alleles and Disease Models
General Comments
References
Gene and Protein Information
class A G protein-coupled receptor
Species TM AA Chromosomal Location Gene Symbol Gene Name Reference
Human 7 479 11p12-p11.2 CHRM4 cholinergic receptor, muscarinic 4 2,23
Mouse 7 479 2 E1 Chrm4 cholinergic receptor, muscarinic 4 42
Rat 7 478 3q32-q35 Chrm4 cholinergic receptor, muscarinic 4 31,61,73
Previous and Unofficial Names
Names References
m4
HM3 52-53
acetylcholine receptor, muscarinic 4
cholinergic receptor, muscarin 4
muscarinic acetylcholine receptor M4
Chrm-4
muscarinic acetylcholine receptor 4
Database Links
ChEMBL Target
DrugBank Target
Ensembl
Entrez Gene
GeneCards
GenitoUrinary Development Molecular Anatomy Project
HomoloGene
Human Protein Reference Database
InterPro
KEGG Gene
OMIM
PharmGKB Gene
PhosphoSitePlus
Protein Ontology (PRO)
RefSeq Nucleotide
RefSeq Protein
TreeFam
UniGene Hs.
UniProt
Wikipedia
Search for 3D structures on the PDB
Search by keyword: Acetylcholine receptors (muscarinic) M4 receptor
Natural/Endogenous Ligand(s)
acetylcholine
Agonists
Key to terms and symbols View all chemical structures Click column headers to sort
Ligand Sp. Action Affinity Units Reference
pentylthio-TZTP Hs Full agonist 8.7 pKi 29
NNC 11-1585 Hs Full agonist 8.6 pKi 11
NNC 11-1607 Hs Full agonist 8.1 pKi 11
xanomeline Hs Partial agonist 7.4 – 7.7 pKi 68,74
NNC 11-1314 Hs Full agonist 7.3 pKi 11
sabcomeline Hs Partial agonist 7.2 pKi 74
McN-A-343 Hs Partial agonist 5.6 – 6.7 pKi 33
arecaidine propargyl ester Hs Full agonist 5.9 pKi 29
arecoline Hs Full agonist 5.5 pKi 29
milameline Hs Partial agonist 5.5 pKi 74
oxotremorine Hs Full agonist 5.2 pKi 29
oxotremorine-M Hs Full agonist 5.2 pKi 29
pilocarpine Hs Partial agonist 5.2 pKi 29
acetylcholine Hs Full agonist 4.5 – 5.6 pKi 7,29,35
methylfurmethide Hs Full agonist 4.7 pKi 29
carbachol Hs Full agonist 4.3 – 4.9 pKi 29,74
furmethide Hs Full agonist 4.3 pKi 29
bethanechol Hs Full agonist 4.0 pKi 29
(+)aceclidine Hs Full agonist 5.4 pEC50 17
(-)aceclidine Hs Partial agonist 4.8 pEC50 17
Agonist Comments
The binding data for McN-A-343 [33] is found on rat striatum.
Please consult references [3,37,55,67] for further details of the activity of some of the ligands in this list.
McN-A-343 and pilocarpine have been found to be partial agonists [37] and full agonists [55,67] at the M4 receptor.
Antagonists
Key to terms and symbols View all chemical structures Click column headers to sort
Ligand Sp. Action Affinity Units Reference
[3H]QNB Hs Antagonist 9.7 – 10.5 pKd 10,53
[3H]N-methyl scopolamine Hs Antagonist 7.8 – 10.2 pKd 6-7,10,26,29-30,32,35,49,67
[3H]AF DX-384 Hs Antagonist 8.6 pKd 46
propantheline Hs Antagonist 10.2 pKi 28
atropine Rn Antagonist 9.7 pKi 31
scopolamine Hs Antagonist 9.5 pKi 28
ipratropium Hs Antagonist 9.2 pKi 26
4-DAMP Rn Antagonist 9.1 pKi 31
atropine Hs Antagonist 8.7 – 9.5 pKi 4,26,28,53
4-DAMP Hs Antagonist 8.9 pKi 15
MT3 Hs Antagonist 8.7 pKi 30,49
silahexocyclium Hs Antagonist 8.5 pKi 4
hexocyclium Hs Antagonist 8.3 pKi 4
darifenacin Hs Antagonist 8.1 pKi 26
himbacine Hs Antagonist 7.9 – 8.2 pKi 30,45
AFDX384 Hs Antagonist 8.0 pKi 15
AF-DX 116 Hs Antagonist 7.0 – 8.7 pKi 4,18
HHSiD Rn Antagonist 7.7 pKi 31
p-F-HHSiD Hs Antagonist 7.1 – 7.5 pKi 18,28
hexahydrodifenidol Hs Antagonist 7.1 pKi 4
HHSiD Hs Antagonist 6.5 – 7.7 pKi 4,18
MT1 Hs Antagonist 7.1 pKi 24
pirenzepine Rn Antagonist 7.1 pKi 31
methoctramine Hs Antagonist 6.6 – 7.0 pKi 4,18
pirenzepine Hs Antagonist 5.9 – 7.6 pKi 4,18,28,30,53
AF-DX 116 Rn Antagonist 6.5 pKi 31
guanylpirenzepine Rn Antagonist 6.2 pKi 66
MT2 Hs Antagonist 5.9 pKi 24
VU0255035 Hs Antagonist 5.9 pKi 57
lithocholylcholine Hs Antagonist 5.3 pKi 7
View species-specific antagonist tables
Allosteric Regulators
Key to terms and symbols View all chemical structures Click column headers to sort
Ligand Sp. Action Affinity Units Reference
KT 5720 Hs Neutral 6.4 pKd 39
WIN 51,708 Hs Negative 6.2 pKd 40
WIN 62,577 Hs Negative 5.9 pKd 40
Gö 7874 Hs Neutral 5.7 pKd 39
alcuronium Hs Negative 5.6 pKd 29
brucine Hs Negative 4.7 – 6.0 pKd 29,38
staurosporine Hs Neutral 5.3 pKd 39
strychnine Hs Positive 4.8 – 5.0 pKd 29,35
eburnamonine Hs Positive 4.6 pKd 29
N-benzyl brucine Hs Neutral 4.5 pKd 38
N-benzyl brucine Hs Negative 4.5 pKd 38
N-chloromethyl-brucine Hs Neutral 4.4 pKd 38
vincamine Hs Positive 4.2 pKd 29
thiochrome Hs Positive 4.0 pKd 36
brucine N-oxide Hs Neutral 3.6 pKd 38
brucine N-oxide Hs Positive 3.6 pKd 38

Explore drug-target interactions for this set of compounds using iPHACE

Primary Transduction Mechanisms
Transducer Effector/Response
Gi/Go family Adenylate cyclase inhibition
References:  44,52
Tissue Distribution
Bladder.
Species:  Human
Technique:  RT-PCR.
References:  62
Esophageal smooth muscle.
Species:  Human
Technique:  Radioligand binding.
References:  54
CNS: forebrain.
Species:  Mouse
Technique:  immunocytochemistry.
References:  27
CNS: cerebral cortex, corpus striatum, thalamus, hypothalamus, pons-medulla.
Species:  Mouse
Technique:  Radioligand binding.
References:  47
Vestibular system.
Species:  Rat
Technique:  RT-PCR.
References:  65
CNS: cerebral cortex, hippocampus, corpus striatum, olfactory tubercle, midbrain, pons-medulla, cerebellum.
Species:  Rat
Technique:  Immunoprecipitation.
References:  75
CNS: hippocampus.
Species:  Rat
Technique:  immunocytochemistry.
References:  41
CNS: basal forebrain, pedunculopontine and laterodorsal tegmental nuclei.
Species:  Rat
Technique:  in situ hybridisation.
References:  64
CNS: caudate putamen, nucleus accumbens, olfactory tubercle.
Species:  Rat
Technique:  in situ hybridisation.
References:  69
Heart: intrinsic neurons.
Species:  Rat
Technique:  in situ hybridisation.
References:  25
Expression Datasets

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Log average relative transcript abundance in mouse tissues measured by qPCR from Regard, J.B., Sato, I.T., and Coughlin, S.R. (2008). Anatomical profiling of G protein-coupled receptor expression. Cell, 135(3): 561-71. [PMID:18984166] [Raw data: website]

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Functional Assays
Measurement of IP1 levels in murine fibroblast cells (B82) transfected with the rat M4 receptor.
Species:  Rat
Tissue:  B82 cells.
Response measured:  Stimulation of IP1 accumulation.
References:  31
Measurement of cAMP levels in murine fibroblast cells (B82) transfected with the rat M4 receptor.
Species:  Rat
Tissue:  B82 cells.
Response measured:  Inhibition of cAMP accumulation.
References:  31
Measurement of cAMP levels in JEG-3 cells transfected with the human M2 receptor, using a cAMP response element (CRE)-coupled luciferase construct as the reporter.
Species:  Human
Tissue:  JEG-3 cells.
Response measured:  Inhibition of cAMP accumulation.
References:  44
Measurement of cAMP levels in CHO cells transfected with the human M4 receptor.
Species:  Human
Tissue:  CHO cells.
Response measured:  Inhibition of cAMP accumulation.
References:  11
Measurement of ERK1/2 activity in COS-7 cells transfected with the human M4 receptor.
Species:  Human
Tissue:  COS-7 cells.
Response measured:  Increase in ERK1/2 activity.
References:  56
Measurement of Ca2+ channel activity in rat superior cervical ganglion neurons endogenously expressing the M4 receptor.
Species:  Rat
Tissue:  Superior cervical ganglion neurons.
Response measured:  Inhibition of Ca2+ channels.
References:  19-20
Measurement of AC activity in rat striatal homogenates endogenously expressing the M4 receptor.
Species:  Rat
Tissue:  Corpus striatum.
Response measured:  Inhibition of AC activity.
References:  16,48
Measurement of the effects of a ligand on the level, or rate, of binding of GTPγ35S to membranes.
Species:  Human
Tissue:  CHO cells.
Response measured:  The binding of GTPγ35S to G proteins coupled to the receptor.
References:  1,34-37,39-40
Measurement of the effects of a ligand on the rate of hydrolysis of GTP by G proteins in membranes.
Species:  Human
Tissue:  CHO cell membranes.
Response measured:  Generation of 32Pi from [γ-32P]GTP.
References:  1,37
Physiological Functions
Autoreceptor: modulation of acetylcholine release.
Species:  Rat
Tissue:  Urinary bladder.
References:  12
Autoreceptor: modulation of acetylcholine release.
Species:  Human
Tissue:  Urinary bladder detrusor muscle.
References:  13
Contraction.
Species:  Rat
Tissue:  Urinary bladder detrusor muscle.
References:  51
Inhibition of dopaminergic (D1 receptor) signalling.
Species:  Rat
Tissue:  Nucleus accumbens.
References:  50
Cell migration.
Species:  Human
Tissue:  Keratinocytes.
References:  9
Physiological Consequences of Altering Gene Expression
Hippocampal, cortical and striatal brain slices from M2/M4 double knockout mice lack muscarinic agonist-induced inhibition of acetylcholine release that is seen with wild-type brain slices.
Striatal slices from M4 receptor single knockout mice exhibit the same loss of inhibition of acetylcholine release, but the inhibition remains intact in the hippocampal and cortical slices.
Species:  Mouse
Tissue: 
Technique:  Gene targeting in embryonic stem cells.
References:  76
Smooth muscle preparations (gallbladder) from M4 receptor knockout mice exhibit reduced agonist-induced contractions compared to wild-type mice.
Species:  Mouse
Tissue: 
Technique:  Gene targeting in embryonic stem cells.
References:  58
Vas deferens tissue from M4 receptor knockout mice exhibits reduced agonist-induced inhibition of noradrenaline release compared to wild-type mice.
Species:  Mouse
Tissue: 
Technique:  Gene targeting in embryonic stem cells.
References:  60
Striatal slices from M4 receptor knockout mice exhibit abolished agonist-induced potentiation of dopamine release.
Species:  Mouse
Tissue: 
Technique:  Gene targeting in embryonic stem cells.
References:  77
M4 receptor knockout mice exhibit enhanced dopaminergic locomotor activity.
Species:  Mouse
Tissue: 
Technique:  Gene targeting in embryonic stem cells.
References:  21-22
Epidermal keratinocytes from M4 receptor knockout mice exhibit reduced agonist-induced migration compared to keratinocytes from wild-type mice.
Species:  Mouse
Tissue: 
Technique:  Gene targeting in embryonic stem cells.
References:  9
M4 receptor knockout mice exhibit increased basal hippocampal acetylcholine levels compared to wild-type mice.
M2/M4 double knockout mice exhibit a further increase in basal acetylcholine levels.
In addition, M4 and M2/M4 knockout mice exhibit an increase in hippocampal acetylcholine release in response to a novel environment.
Species:  Mouse
Tissue: 
Technique:  Gene targeting in embryonic stem cells.
References:  63
M4 receptor knockout mice exhibit a significantly reduced wound epithelialisation rate compared to wild-type mice.
Species:  Mouse
Tissue: 
Technique:  Gene targeting in embryonic stem cells.
References:  8
Smooth muscle from the small intestine of M4 receptor knockout mice do not exhibit any alteration in EFS-induced acetylcholine release.
However, M2/M4 double knockout mice exhibit an increase in acetylcholine release.
Overall, it is thought that both M2 and M4 receptors mediate the autoinhibitory control of acetylcholine release in the mouse ileum, and that each can compensate for loss of the other.
Species:  Mouse
Tissue: 
Technique:  Gene targeting in embryonic stem cells.
References:  59
M4 receptor knockout mice exhibit an increase in anxiolysis compared to wild-type mice.
Species:  Mouse
Tissue: 
Technique:  Gene targeting in embryonic stem cells.
References:  14
Phenotypes, Alleles and Disease Models Mouse data from MGI

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Allele Composition & genetic background Accession Phenotype Id Phenotype Reference
Chrm4tm1Minm Chrm4tm1Minm/Chrm4tm1Minm
involves: 129X1/SvJ * DBA/2J
MGI:88399  MP:0009745 abnormal behavioral response to xenobiotic PMID: 12729838 
Chrm2tm1Jwe|Chrm4tm1Jwe Chrm2tm1Jwe/Chrm2tm1Jwe,Chrm4tm1Jwe/Chrm4tm1Jwe
involves: 129S4/SvJae * 129S6/SvEvTac * CF-1
MGI:88397  MGI:88399  MP:0004994 abnormal brain wave pattern PMID: 16110248 
Chrm4tm1Jwe Chrm4tm1Jwe/Chrm4tm1Jwe
involves: 129S6/SvEvTac * CF-1
MGI:88399  MP:0002206 abnormal CNS synaptic transmission PMID: 15919709 
Chrm1tm1Jwe|Chrm4tm1Jwe Chrm1tm1Jwe/Chrm1tm1Jwe,Chrm4tm1Jwe/Chrm4tm1Jwe
involves: 129S6/SvEvTac * CF-1
MGI:88396  MGI:88399  MP:0002206 abnormal CNS synaptic transmission PMID: 15919709 
Chrm2tm1Jwe|Chrm4tm1Jwe Chrm2tm1Jwe/Chrm2tm1Jwe,Chrm4tm1Jwe/Chrm4tm1Jwe
involves: 129S4/SvJae * 129S6/SvEvTac * CF-1
MGI:88397  MGI:88399  MP:0002206 abnormal CNS synaptic transmission PMID: 15919709 
Chrm4tm1Jwe Chrm4tm1Jwe/Chrm4tm1Jwe
involves: 129S6/SvEvTac * CF-1
MGI:88399  MP:0005085 abnormal gallbladder physiology PMID: 11961069 
Chrm4tm1Jwe Chrm4tm1Jwe/Chrm4tm1Jwe
involves: 129S6/SvEvTac * CF-1
MGI:88399  MP:0001629 abnormal heart rate PMID: 10688600 
Chrm4tm1Minm Chrm4tm1Minm/Chrm4tm1Minm
involves: 129X1/SvJ * DBA/2J
MGI:88399  MP:0001392 abnormal locomotor activity PMID: 12729838 
Chrm4tm2.1Jwe|Tg(Drd1a-cre)AGsc Chrm4tm2.1Jwe/Chrm4tm2.1Jwe,Tg(Drd1a-cre)AGsc/0
involves: 129S6/SvEvTac * C57BL/6 * FVB/N
MGI:3761815  MGI:88399  MP:0004811 abnormal neuron physiology PMID: 20147565 
Chrm4tm1Jwe Chrm4tm1Jwe/Chrm4tm1Jwe
B6.129S6-Chrm4
MGI:88399  MP:0001529 abnormal vocalization PMID: 18382674 
Chrm4tm2.1Jwe|Tg(Drd1a-cre)AGsc Chrm4tm2.1Jwe/Chrm4tm2.1Jwe,Tg(Drd1a-cre)AGsc/0
involves: 129S6/SvEvTac * C57BL/6 * FVB/N
MGI:3761815  MGI:88399  MP:0002822 catalepsy PMID: 20147565 
Chrm4tm1Jwe Chrm4tm1Jwe/Chrm4tm1Jwe
involves: 129S6/SvEvTac * CF-1
MGI:88399  MP:0001262 decreased body weight PMID: 10468635 
Chrm1tm1Jwe|Chrm4tm1Jwe Chrm1tm1Jwe/Chrm1tm1Jwe,Chrm4tm1Jwe/Chrm4tm1Jwe
involves: 129S6/SvEvTac * CF-1
MGI:88396  MGI:88399  MP:0002917 decreased synaptic depression PMID: 15919709 
Chrm4tm2.1Jwe|Tg(Drd1a-cre)AGsc Chrm4tm2.1Jwe/Chrm4tm2.1Jwe,Tg(Drd1a-cre)AGsc/0
involves: 129S6/SvEvTac * C57BL/6 * FVB/N
MGI:3761815  MGI:88399  MP:0009749 enhanced behavioral response to addictive substance PMID: 20147565 
Chrm4tm2.1Jwe|Tg(Drd1a-cre)AGsc Chrm4tm2.1Jwe/Chrm4tm2.1Jwe,Tg(Drd1a-cre)AGsc/0
involves: 129S6/SvEvTac * C57BL/6 * FVB/N
MGI:3761815  MGI:88399  MP:0009754 enhanced behavioral response to cocaine PMID: 20147565 
Chrm4tm2.1Jwe|Tg(Drd1a-cre)AGsc Chrm4tm2.1Jwe/Chrm4tm2.1Jwe,Tg(Drd1a-cre)AGsc/0
involves: 129S6/SvEvTac * C57BL/6 * FVB/N
MGI:3761815  MGI:88399  MP:0009746 enhanced behavioral response to xenobiotic PMID: 20147565 
Chrm4tm1Jwe Chrm4tm1Jwe/Chrm4tm1Jwe
involves: 129S6/SvEvTac * CF-1
MGI:88399  MP:0001399 hyperactivity PMID: 10468635 
Chrm4tm2.1Jwe|Tg(Drd1a-cre)AGsc Chrm4tm2.1Jwe/Chrm4tm2.1Jwe,Tg(Drd1a-cre)AGsc/0
involves: 129S6/SvEvTac * C57BL/6 * FVB/N
MGI:3761815  MGI:88399  MP:0001399 hyperactivity PMID: 20147565 
Chrm4tm2.1Jwe|Tg(Drd1a-cre)AGsc Chrm4tm2.1Jwe/Chrm4tm2.1Jwe,Tg(Drd1a-cre)AGsc/0
involves: 129S6/SvEvTac * C57BL/6 * FVB/N
MGI:3761815  MGI:88399  MP:0009747 impaired behavioral response to xenobiotic PMID: 20147565 
Chrm4tm1Jwe Chrm4tm1Jwe/Chrm4tm1Jwe
involves: 129S6/SvEvTac * CF-1
MGI:88399  MP:0000740 impaired smooth muscle contractility PMID: 11961069 
Chrm4tm2.1Jwe|Tg(Drd1a-cre)AGsc Chrm4tm2.1Jwe/Chrm4tm2.1Jwe,Tg(Drd1a-cre)AGsc/0
involves: 129S6/SvEvTac * C57BL/6 * FVB/N
MGI:3761815  MGI:88399  MP:0001906 increased dopamine level PMID: 20147565 
General Comments
For reviews on muscarinic receptor knockout mice see [5,43,70-72].

REFERENCES

To cite this database page, please use the following:

Nigel J. M. Birdsall, David A. Brown, Noel J. Buckley, Arthur Christopoulos, Richard M. Eglen, Frederick Ehlert, Rudolf Hammer, Heinz J. Kilbinger, Günter Lambrecht, Fred Mitchelson, Ernst Mutschler, Neil M. Nathanson, Roy D. Schwarz, Andrew B. Tobin, Jurgen Wess.
Acetylcholine receptors (muscarinic): M4 receptor. Last modified on 05/03/2013. Accessed on 22/05/2013. IUPHAR database (IUPHAR-DB), http://www.iuphar-db.org/DATABASE/ObjectDisplayForward?objectId=16.


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