Subtopic Deep Dive

P2X Receptor Molecular Physiology
Research Guide

What is P2X Receptor Molecular Physiology?

P2X Receptor Molecular Physiology studies the structure-function relationships, subunit assembly, gating mechanisms, and regulation of ATP-gated P2X ion channels.

Research characterizes P2X receptors as ligand-gated cation channels with two transmembrane domains and a large extracellular loop, as cloned for P2X5 and P2X6 subunits (Collo et al., 1996, 878 citations). Standardized nomenclature and properties across seven P2X subunits were established (Khakh et al., 2001, 635 citations). Activation and regulation involve ATP binding, ion permeation, and desensitization (Coddou et al., 2011, 479 citations).

Curated Papers

Key Challenges

Why It Matters

Structural and functional insights into P2X receptors guide development of selective antagonists for chronic pain and inflammation, leveraging gating properties identified in activation studies (Coddou et al., 2011). P2X7 receptor knockout reduces leukocyte activation and inflammatory responses, supporting therapeutic targeting in autoimmune diseases (Labasi et al., 2002, 486 citations). Astrocytic P2X7-mediated ATP release amplifies Ca2+ signaling, influencing neuroinflammation models (Suadicani et al., 2006, 508 citations).

Key Research Challenges

Subunit Stoichiometry Determination

Defining trimeric assembly rules for homomeric and heteromeric P2X channels remains unresolved across isoforms. Collo et al. (1996) cloned P2X5/P2X6 but functional heteromers require mutagenesis validation. Cryo-EM resolves structures but physiological contexts vary.

Gating Mechanism Elucidation

ATP binding induces conformational changes for pore opening, yet allosteric modulation and desensitization kinetics differ by subunit. Khakh et al. (2001) outlined properties but voltage-dependence needs electrophysiology refinement. Coddou et al. (2011) detail regulation gaps.

Desensitization Pathway Mapping

Rapid vs. sustained currents link to disease states, but molecular determinants are subunit-specific. P2X7 shows unique pore dilation absent in P2X2 (Labasi et al., 2002). Mutagenesis identifies sites but trafficking roles unclear.

Essential Papers

Cellular function and molecular structure of ecto-nucleotidases

Herbert Zimmermann, M. Zebisch, Norbert Sträter · 2012 · Purinergic Signalling · 955 citations

The E-NTPDase family of ectonucleotidases: Structure function relationships and pathophysiological significance

Simon C. Robson, Jean Sévigny, Herbert Zimmermann · 2006 · Purinergic Signalling · 910 citations

Cloning OF P2X5 and P2X6 receptors and the distribution and properties of an extended family of ATP-gated ion channels

Ginetta Collo, North Ra, Eric Kawashima et al. · 1996 · Journal of Neuroscience · 878 citations

Two new P2X receptor cDNAs (P2X5 and P2X6) were isolated and expressed. All six proteins are 36–48 percent identical and seem to have two transmembrane segments with a large extracellular loop. Fun...

International union of pharmacology. XXIV. Current status of the nomenclature and properties of P2X receptors and their subunits.

Khakh Bs, Geoffrey Burnstock, Charles Kennedy et al. · 2001 · PubMed · 635 citations

ATP acts as a humoral mediator to control cell function extracellularly. The receptors that mediate the actions of ATP belong to two classes, the metabotropic P2Y receptors and the transmitter-gate...

DAMPs from Cell Death to New Life

Emilie Vénéreau, Chiara Ceriotti, Marco E. Bianchi · 2015 · Frontiers in Immunology · 631 citations

Our body handles tissue damage by activating the immune system in response to intracellular molecules released by injured tissues [damage-associated molecular patterns (DAMPs)], in a similar way as...

Extracellular ATP or ADP Induce Chemotaxis of Cultured Microglia through G<sub>i/o</sub>-Coupled P2Y Receptors

Shizuyo Honda, Yo Sasaki, Keiko Ohsawa et al. · 2001 · Journal of Neuroscience · 564 citations

The initial microglial responses that occur after brain injury and in various neurological diseases are characterized by microglial accumulation in the affected sites of brain that results from the...

Extracellular purines, purinergic receptors and tumor growth

Francesco Di Virgilio, Elena Adinolfi · 2016 · Oncogene · 542 citations

Reading Guide

Foundational Papers

Read Collo et al. (1996, 878 citations) first for P2X cloning and topology; Khakh et al. (2001, 635 citations) next for nomenclature and properties.

Recent Advances

Coddou et al. (2011, 479 citations) for activation mechanisms; Labasi et al. (2002, 486 citations) for P2X7 leukocyte functions.

Core Methods

Cloning/expression (Collo 1996), electrophysiology (Coddou 2011), knockout models (Labasi 2002), nomenclature reviews (Khakh 2001).

How PapersFlow Helps You Research P2X Receptor Molecular Physiology

Discover & Search

PapersFlow's Research Agent uses searchPapers and citationGraph to map P2X literature from Collo et al. (1996, 878 citations), revealing 635+ connections to Khakh et al. (2001). exaSearch uncovers cryo-EM gating studies; findSimilarPapers expands to P2X7 regulation like Labasi et al. (2002).

Analyze & Verify

Analysis Agent employs readPaperContent on Coddou et al. (2011) for gating kinetics, verifies claims with CoVe against Khakh et al. (2001), and runs PythonAnalysis for current-voltage curve simulations using NumPy. GRADE scores evidence on subunit assembly from Collo et al. (1996).

Synthesize & Write

Synthesis Agent detects gaps in heteromer physiology post-Khakh et al. (2001); Writing Agent uses latexEditText, latexSyncCitations for P2X reviews, and latexCompile for manuscripts. exportMermaid diagrams channel topologies from cryo-EM data.

Use Cases

"Analyze P2X5/P2X6 gating properties from 1996 cloning paper."

Research Agent → searchPapers('P2X5 P2X6 Collo') → Analysis Agent → readPaperContent + runPythonAnalysis (simulate ATP dose-response curves) → matplotlib plots of EC50 values.

"Draft LaTeX review on P2X7 inflammation role."

Synthesis Agent → gap detection (post-Labasi 2002) → Writing Agent → latexEditText (structure-function section) → latexSyncCitations (Khakh 2001) → latexCompile → PDF with figures.

"Find code for P2X electrophysiology simulations."

Research Agent → citationGraph(Collo 1996) → Code Discovery → paperExtractUrls → paperFindGithubRepo → githubRepoInspect → NEURON model scripts for gating kinetics.

Automated Workflows

Deep Research workflow scans 50+ P2X papers via searchPapers, structures reports on subunit evolution from Collo et al. (1996) to Coddou et al. (2011). DeepScan applies 7-step CoVe to verify desensitization claims in Suadicani et al. (2006). Theorizer generates hypotheses on P2X7 pore dilation from Labasi et al. (2002) knockouts.

Try Doxa for P2X Receptor Molecular Physiology Research

Frequently Asked Questions

What defines P2X receptor molecular physiology?

P2X receptors are ATP-gated ion channels with two transmembrane segments and large extracellular loops; physiology examines structure-function, assembly, and gating (Khakh et al., 2001). Collo et al. (1996) cloned isoforms showing 36-48% identity.

What methods study P2X physiology?

Electrophysiology measures currents, mutagenesis tests residues, cryo-EM resolves structures (Coddou et al., 2011). Cloning expressed P2X5/P2X6 for functional assays (Collo et al., 1996).

What are key papers on P2X receptors?

Collo et al. (1996, 878 citations) cloned P2X5/P2X6; Khakh et al. (2001, 635 citations) standardized nomenclature; Coddou et al. (2011, 479 citations) reviewed activation.