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Ion Channels and Receptors
Research Guide
What is Ion Channels and Receptors?
Ion channels and receptors are protein complexes in cell membranes that conduct ions such as calcium in response to stimuli like heat, chemicals, or mechanical force, playing essential roles in sensory neurons for thermosensation, nociception, and pain signaling.
This field encompasses 44,074 papers on calcium signaling and ion channels, including TRP channels in sensory neurons for thermosensation and nociception. Key topics include store-operated channels, Orai1, and STIM1 in calcium homeostasis. Research spans sensory perception and related diseases.
Topic Hierarchy
Research Sub-Topics
TRP Channel Thermosensation
This sub-topic focuses on TRPV1, TRPM8, and other TRP channels as molecular thermometers in sensory neurons. Researchers study temperature gating mechanisms, polymorphisms, and modulators.
TRP Channels Nociception
This sub-topic examines TRPA1, TRPV1 roles in inflammatory and neuropathic pain signaling pathways. Researchers investigate sensitization, knockout models, and pharmacological targeting.
Store-Operated Calcium Entry
This sub-topic covers Orai1-STIM1 coupling in CRAC channels and their regulation in immune and epithelial cells. Researchers explore trafficking, diseases like SCID, and inhibitors.
Calcium Signaling Sensory Neurons
This sub-topic analyzes IP3R, RyR, and plasma membrane channel contributions to neuronal excitability. Researchers use imaging and optogenetics to map signaling microdomains.
Piezo Channels Mechanosensation
This sub-topic investigates Piezo1/2 in touch, proprioception, and vascular mechanotransduction. Researchers study structure-function via cryo-EM and gain/loss-of-function mutations.
Why It Matters
Ion channels and receptors enable detection of painful stimuli through mechanisms identified in primary sensory neurons. "The capsaicin receptor: a heat-activated ion channel in the pain pathway" (Caterina et al., 1997) demonstrated that the VR1 channel responds to capsaicin, protons, and heat above 43°C, integrating chemical and thermal pain signals with 8,950 citations. "Impaired Nociception and Pain Sensation in Mice Lacking the Capsaicin Receptor" (Caterina et al., 2000) showed mice without VR1 exhibit reduced thermal pain sensitivity, confirming its role in vivo with 3,487 citations. "Piezo1 and Piezo2 Are Essential Components of Distinct Mechanically Activated Cation Channels" (Coste et al., 2010) established Piezo channels for mechanical sensation in touch and hearing, with 3,016 citations, impacting treatments for sensory disorders.
Reading Guide
Where to Start
"The capsaicin receptor: a heat-activated ion channel in the pain pathway" (Caterina et al., 1997) because it introduces the foundational VR1/TRPV1 channel, its activation by heat and capsaicin, and direct link to pain pathways, serving as an entry to sensory ion channel research.
Key Papers Explained
"The capsaicin receptor: a heat-activated ion channel in the pain pathway" (Caterina et al., 1997) cloned VR1 as a heat- and capsaicin-activated channel. "Impaired Nociception and Pain Sensation in Mice Lacking the Capsaicin Receptor" (Caterina et al., 2000) validated its in vivo role via knockouts showing reduced thermal pain. "The Cloned Capsaicin Receptor Integrates Multiple Pain-Producing Stimuli" (Tominaga et al., 1998) expanded on VR1 integrating protons and other stimuli. Berridge's works (Berridge, 1993; Berridge et al., 2000; Berridge et al., 2003) provide the calcium signaling context underpinning these channels.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Research emphasizes molecular details of TRP and Piezo channels in sensory integration, as in "Cellular and Molecular Mechanisms of Pain" (Basbaum et al., 2009) and "Piezo1 and Piezo2 Are Essential Components of Distinct Mechanically Activated Cation Channels" (Coste et al., 2010). No recent preprints or news available, so frontiers remain in unresolved in vivo functions of store-operated channels like Orai1/STIM1 in pain disease models.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | The capsaicin receptor: a heat-activated ion channel in the pa... | 1997 | Nature | 8.9K | ✓ |
| 2 | Inositol trisphosphate and calcium signalling | 1993 | Nature | 6.6K | ✕ |
| 3 | The versatility and universality of calcium signalling | 2000 | Nature Reviews Molecul... | 5.6K | ✕ |
| 4 | Calcium signalling: dynamics, homeostasis and remodelling | 2003 | Nature Reviews Molecul... | 5.4K | ✓ |
| 5 | Cellular and Molecular Mechanisms of Pain | 2009 | Cell | 4.1K | ✓ |
| 6 | Inositol phosphates and cell signalling | 1989 | Nature | 4.1K | ✕ |
| 7 | Calcium Signaling | 2007 | Cell | 4.0K | ✓ |
| 8 | Impaired Nociception and Pain Sensation in Mice Lacking the Ca... | 2000 | Science | 3.5K | ✕ |
| 9 | The Cloned Capsaicin Receptor Integrates Multiple Pain-Produci... | 1998 | Neuron | 3.0K | ✓ |
| 10 | Piezo1 and Piezo2 Are Essential Components of Distinct Mechani... | 2010 | Science | 3.0K | ✓ |
Frequently Asked Questions
What is the capsaicin receptor?
The capsaicin receptor is a heat-activated ion channel, known as VR1, expressed in primary sensory neurons of the pain pathway. "The capsaicin receptor: a heat-activated ion channel in the pain pathway" (Caterina et al., 1997) showed it activates by capsaicin, protons, or heat above 43°C. This channel integrates multiple pain-producing stimuli.
How does calcium signaling occur via inositol trisphosphate?
Inositol trisphosphate triggers calcium release from intracellular stores. "Inositol trisphosphate and calcium signalling" (Berridge, 1993) detailed IP3 binding to receptors on the endoplasmic reticulum, mobilizing calcium for cellular responses. This mechanism underlies versatile signaling in sensory and other cells.
What role do TRP channels play in nociception?
TRP channels, like VR1, detect noxious heat and chemicals in sensory neurons. "The Cloned Capsaicin Receptor Integrates Multiple Pain-Producing Stimuli" (Tominaga et al., 1998) demonstrated VR1 responds to heat, protons, and capsaicin. This contributes to pain pathway activation.
Why is VR1 important for pain sensation?
VR1 knockout mice show impaired nociception and reduced pain from heat. "Impaired Nociception and Pain Sensation in Mice Lacking the Capsaicin Receptor" (Caterina et al., 2000) reported these mice lack responses to capsaicin and high temperatures above 43°C. VR1 thus mediates thermal and chemical pain in vivo.
What are Piezo channels?
Piezo1 and Piezo2 form mechanically activated cation channels essential for touch and hearing. "Piezo1 and Piezo2 Are Essential Components of Distinct Mechanically Activated Cation Channels" (Coste et al., 2010) identified them as mediators of mechanical responses in diverse cells. They conduct currents in response to mechanical stimulation.
How does store-operated calcium entry function?
Store-operated channels like Orai1 and STIM1 maintain calcium homeostasis after store depletion. Papers in this cluster explore their role in sensory calcium signaling. This sustains signaling in neurons involved in thermosensation and pain.
Open Research Questions
- ? How do TRP channels integrate diverse stimuli like heat, chemicals, and protons at the molecular level?
- ? What are the precise contributions of Orai1 and STIM1 to calcium homeostasis in nociceptive sensory neurons?
- ? How do Piezo1 and Piezo2 differentially mediate mechanical sensitivity in touch versus hearing pathways?
- ? What downstream effectors of IP3-induced calcium release regulate pain hypersensitivity in disease states?
- ? How do genetic variations in ion channels alter thermosensation thresholds across species?
Recent Trends
The field includes 44,074 works with no specified 5-year growth rate.
Highly cited papers from 1989-2010 dominate, such as Berridge et al. (1989, 2000, 2003) on calcium signaling and Julius lab works (Caterina et al., 1997, 2000; Tominaga et al., 1998) on VR1/TRPV1. No recent preprints or news in last 12 months indicate steady focus on established mechanisms.
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