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Published on: August 8, 2022
Characterisation of the R276A gain-of-function mutation in the ectodomain of murine P2X7
Sahil Adriouch1, Felix Scheuplein, Robert Bähring
1Inserm U905, 76183, Rouen, France, sahil.adriouch@univ-rouen.fr.
Abstract:
The cytolytic P2X7 purinoceptor is widely expressed on leukocytes and has sparked interest because of its key role in the activation of the inflammasome, the release of the pro-inflammatory cytokine IL-1beta and cell death. We report here the functional characterisation of a R276A gain-of-function mutant analysed for its capacities to induce membrane depolarisation, calcium influx and opening of a large membrane pore permeable to YO-PRO-1. Our results highlight the particular sensitivity of R276A mutant to low micromolar adenosine triphosphate (ATP) concentrations, which possibly reflect an increased affinity for its ligands, and a slower closing kinetics of the receptor channel. Our findings support the notion that evolutionary pressures maintain the low sensitivity of P2X7 to ATP. We also believe that the R276A mutant described here may be useful for the generation of new animal models with exacerbated P2X7 functions that will serve to better characterise its role in inflammation and in immune responses.
Insights
Researchers characterized a P2X7 receptor mutant (R276A) with enhanced function. This gain-of-function mutant shows increased sensitivity to adenosine triphosphate (ATP), offering new avenues for studying inflammation and immune responses.
Area of Science:
- Immunology
- Cell Biology
- Pharmacology
Background:
- The P2X7 purinoceptor is crucial for leukocyte activation, inflammasome assembly, IL-1beta release, and cell death.
- Its role in inflammation and immune responses makes it a significant research target.
Purpose of the Study:
- To functionally characterize a gain-of-function mutant (R276A) of the P2X7 purinoceptor.
- To investigate the mutant's effects on membrane potential, calcium influx, and pore formation.
Main Methods:
- Functional characterization of the P2X7 R276A mutant.
- Analysis of membrane depolarization, calcium influx, and YO-PRO-1 dye uptake.
- Assessment of receptor channel kinetics and ligand sensitivity.
Main Results:
- The R276A mutant exhibits heightened sensitivity to low micromolar concentrations of adenosine triphosphate (ATP).
- The mutant displays increased affinity for its ligands and slower channel closing kinetics.
- These findings suggest evolutionary pressure maintains P2X7's low ATP sensitivity.
Conclusions:
- The R276A P2X7 mutant provides a valuable tool for studying P2X7 receptor function in inflammatory and immune processes.
- This mutant may facilitate the development of novel animal models to explore P2X7's role in disease.
- Understanding P2X7 receptor dynamics is key to developing new therapeutic strategies for inflammatory conditions.
