Direct modulation of TRPC ion channels by Gα proteins
Open accessAbstract
GPCR-G i protein pathways are involved in the regulation of vagus muscarinic pathway under physiological conditions and are closely associated with the regulation of internal visceral organs. The muscarinic receptor-operated cationic channel is important in GPCR-G i protein signal transduction as it decreases heart rate and increases GI rhythm frequency. In the SA node of the heart, acetylcholine binds to the M2 receptor and the released Gβγ activates GIRK (I(K,ACh)) channel, inducing a negative chronotropic action. In gastric smooth muscle, there are two muscarinic acetylcholine receptor (mAChR) subtypes, M2 and M3. M2 receptor activates the muscarinic receptor-operated nonselective cationic current (mIcat, NSCC(ACh)) and induces positive chronotropic effect. Meanwhile, M3 receptor induces hydrolysis of PIP 2 and releases DAG and IP 3. This IP 3 increases intracellular Ca 2+ and then leads to contraction of GI smooth muscles. The activation of mIcat is inhibited by anti-G i/o protein antibodies in GI smooth muscle, indicating the involvement of Gα i/o protein in the activation of mIcat. TRPC4 channel is a molecular candidate for mIcat and can be directly activated by constitutively active Gα iQL proteins. TRPC4 and TRPC5 belong to the same subfamily and both are activated by G i/o proteins. Initial studies suggested that the binding sites for G protein exist at the rib helix or the CIRB domain of TRPC4/5 channels. However, recent cryo-EM structure showed that IYY 58-60 amino acids at ARD of TRPC5 binds with G i3 protein. Considering the expression of TRPC4/5 in the brain, the direct G protein activation on TRPC4/5 is important in terms of neurophysiology. TRPC4/5 channels are also suggested as a coincidence detector for G i and G q pathway as G q pathway increases intracellular Ca 2+ and the increased Ca 2+ facilitates the activation of TRPC4/5 channels. More complicated situation would occur when GIRK, KCNQ2/3 (I M) and TRPC4/5 channels are co-activated by stimulation of muscarinic receptors at the acetylcholine-releasing nerve terminals. This review highlights the effects of GPCR-G i protein pathway, including dopamine, μ-opioid, serotonin, glutamate, GABA, on various oragns, and it emphasizes the importance of considering TRPC4/5 channels as crucial players in the field of neuroscience.
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G-protein-coupled receptors (GPCRs) regulate rapid cellular responses, including release of Ca2+ from the endoplasmic reticulum, increasing intracellular calcium levels.
“Additionally, G-protein-coupled receptors (GPCRs) regulate rapid cellular responses, including the release of Ca2+ from the endoplasmic reticulum, increasing intracellular calcium levels [61].”
From Phytoecdysteroids: Quantification in Selected Plant Species and Evaluation of Some Effects on Gastric Smooth Muscles (2024) · cites this paper as [61]
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Existence of functional M 3 -muscarinic receptors in the human heart
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G-protein-coupled inward rectifier potassium current contributes to ventricular repolarization
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Dual action of the Gαq-PLCβ-PI(4,5)P2 pathway on TRPC1/4 and TRPC1/5 heterotetramers
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Self-citationThe specific activation of TRPC4 by Gi protein subtype
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Regulation of neuropathic pain behavior by amygdaloid TRPC4/C5 channels
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Molecular architecture of the Gαi-bound TRPC5 ion channel
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Self-citationCa2+ influx through carbachol‐activated non‐selective cation channels in guinea‐pig gastric myocytes
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Structural identification of riluzole-binding site on human TRPC5
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Molecular determinants of PKA-dependent inhibition of TRPC5 channel
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Self-citationInteraction of G Protein β Subunit with Inward Rectifier K+ Channel Kir3
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Englerin A-sensing charged residues for transient receptor potential canonical 5 channel activation
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Analysis of Rhes Activation State and Effector Function
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Canonical Transient Receptor Potential Channels as Novel Targets for Antiepileptic Drugs
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Self-citation
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The TRPC5 receptor as pharmacological target for pain and metabolic disease
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Thermosensing ability of TRPC5: current knowledge and unsettled questions
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The mutual interaction of TRPC5 channel with polycystin proteins
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Self-citationTRPC1-5-5-5 heteromer as a sodium sensor
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BLOCKADE OF TRPC4 CHANNELS BY THE PICO145 INHIBITOR: AN EXPERIMENTAL AND MOLECULAR STUDY
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Untangling neuropathic pain: pathophysiological insights and future directions for targeted therapy
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Li, S., Li, X., Wang, Y., Li, K., Shen, D., Luo, L., Jin, X., Li, Y., Nagaoka, K., & Li, C. (2026) · Environment International · doi:10.1016/j.envint.2026.110519
- Authors
- Kang, H., Kim, J., Park, C. H., Jeong, B., & So, I.
- Affiliations
- Seoul National University (KR)
- University of California, San Francisco (US)
- Corresponding author
- So, Insuk
- Venue
- Frontiers in Physiology
- Publisher
- Frontiers Media SA
- Published
- 2024-02-07
- Volume
- 15
- Pages
- 1362987-1362987
- ISSN
- 1664-042X (ISSN-L)
- PMC
- PMC10880550
- OpenAlex
- W4391615480
- Cited by
- 14
- References
- 134
- Citations by year
- 2026: 3 · 2025: 5 · 2024: 6
- FWCI
- 1.14
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Frontiers in Physiology (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- National Research Foundation (BK21 FOUR)
- Seoul National University
- National Research Foundation of Korea (BK 21 four, 2020R1A2C1012670, 2021R1A4A2001857)
- Seoul National University Hospital
- Topics
- Life Sciences › Neuroscience › Sensory Systems › Ion Channels and Receptors
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Calcium signaling and nucleotide metabolism
- Keywords
- TRPC4, TRPC5, muscarinic receptors, GIRK channels, G protein-coupled receptor signaling, G-protein binding site, acetylcholine, mu-opioid receptor
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