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Dissection of P2X4 and P2X7 Receptor Current Components in BV-2 Microglia
Mira Trang1, Günther Schmalzing2, Christa E Müller3
1Julius-Bernstein-Institute for Physiology, Martin-Luther-University, D-06097 Halle-Wittenberg, Germany.
Abstract:
Microglia cells represent the immune system of the central nervous system. They become activated by ATP released from damaged and inflamed tissue via purinergic receptors. Ionotropic purinergic P2X4 and P2X7 receptors have been shown to be involved in neurological inflammation and pain sensation. Whether the two receptors assemble exclusively as homotrimers or also as heterotrimers is still a matter of debate. We investigated the expression of P2X receptors in BV-2 microglia cells applying the whole-cell voltage-clamp technique. We dissected P2X4 and P2X7 receptor-mediated current components by using specific P2X4 and P2X7 receptor blockers and by their characteristic current kinetics. We found that P2X4 and P2X7 receptors are activated independently from each other, indicating that P2X4/P2X7 heteromers are not of functional significance in these cells. The pro-inflammatory mediators lipopolysaccharide and interferon γ, if applied in combination, upregulated P2X4, but not P2X7 receptor-dependent current components also arguing against phenotypically relevant heteromerization of P2X4 and P2X7 receptor subunits.
Insights
Microglia P2X4 and P2X7 receptors do not form functional heteromers in the central nervous system. Their independent activation suggests distinct roles in neurological inflammation and pain signaling.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia are the central nervous system's immune cells.
- ATP binding to purinergic receptors activates microglia in response to tissue damage.
- P2X4 and P2X7 receptors are implicated in neurological inflammation and pain.
Purpose of the Study:
- To investigate the functional assembly of P2X4 and P2X7 receptors in microglia.
- To determine if P2X4 and P2X7 receptors form heteromers or only homotrimers.
- To assess the impact of pro-inflammatory mediators on receptor expression and function.
Main Methods:
- Whole-cell voltage-clamp technique on BV-2 microglia cells.
- Utilized specific P2X4 and P2X7 receptor blockers.
- Analyzed receptor-mediated current kinetics and activation patterns.
- Applied lipopolysaccharide and interferon-γ to assess inflammatory mediator effects.
Main Results:
- P2X4 and P2X7 receptor-mediated currents were activated independently.
- Evidence suggests P2X4/P2X7 heteromers are not functionally significant in BV-2 microglia.
- Combined lipopolysaccharide and interferon-γ upregulated P2X4 currents, but not P2X7 currents.
Conclusions:
- P2X4 and P2X7 receptors function independently in microglia, arguing against functionally relevant heteromerization.
- Findings suggest distinct roles for P2X4 and P2X7 receptors in microglial responses.
- Upregulation of P2X4 currents by inflammatory mediators indicates their specific involvement in neuroinflammation.
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