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Zinc and copper modulate differentially the P2X4 receptor.
C Acuña-Castillo1, B Morales, J P Huidobro-Toro
1Departamento de Fisiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago.
Journal of Neurochemistry
|March 29, 2000
Summary
Zinc potentiates rat P2X4 receptors, enhancing purinergic signaling, while copper inhibits them. These trace metals, zinc and copper, act as physiological modulators of P2X4 receptors.
Area of Science:
- Neuroscience
- Pharmacology
- Biochemistry
Background:
- Purinergic mechanisms are crucial in cellular communication.
- The P2X4 receptor is a key player in purinergic signaling.
- The role of trace metals in modulating P2X4 receptor function is largely unknown.
Purpose of the Study:
- To investigate the effects of zinc and copper on the rat ATP P2X4 receptor.
- To determine if these metals act as physiological regulators of purinergic mechanisms.
Main Methods:
- Expression of the rat ATP P2X4 receptor in Xenopus laevis oocytes.
- Electrophysiological recordings to measure ATP-evoked currents.
- Concentration-response analyses in the presence of varying metal concentrations.
Main Results:
- Zinc potentiated ATP-evoked currents, reducing the EC50 and increasing potency.
- Copper inhibited ATP-evoked currents in a time- and concentration-dependent manner, reducing maximal current.
- Metal effects showed specificity, with cadmium mimicking zinc and mercury mimicking copper.
- Interactions between zinc and copper demonstrated complex modulatory effects.
Conclusions:
- Zinc and copper act as physiological modulators of the P2X4 receptor.
- Metal binding sites likely exist in the extracellular domain of the P2X4 receptor.
- Trace metals can significantly influence brain purinergic transmission.