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Mouse Leydig cells express multiple P2X receptor subunits

Ligia Subitoni Antonio1, Roberta Ribeiro Costa, Marcelo Damário Gomes

  • 1Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900, 14049-900, Ribeirão Preto, SP, Brazil.

Purinergic Signalling
|November 21, 2008
PubMed

Insights

This study identifies P2X receptor subunits in mouse Leydig cells, revealing a functional heteromeric channel possibly involved in testosterone secretion. These findings enhance our understanding of purinergic signaling in reproductive physiology.

Area of Science:

  • Cell Biology
  • Neuroscience
  • Endocrinology

Background:

  • Adenosine triphosphate (ATP) modulates cellular functions via P2X and P2Y receptors.
  • Purinergic signaling, particularly Ca(2+) influx through P2X receptors, is implicated in Leydig cell testosterone secretion.
  • Previous studies suggest mouse Leydig cells express P2X receptors similar to P2X(2).

Purpose of the Study:

  • To identify and characterize P2X receptor subunits in mouse Leydig cells.
  • To investigate the functional role of these receptors in ATP-mediated cellular responses.
  • To determine the potential involvement of heteromeric P2X receptors in Leydig cell function.

Main Methods:

  • Western blot analysis to detect P2X receptor subunits.
  • Immunofluorescence microscopy to confirm subunit localization.
  • Electrophysiological recordings (whole-cell currents) and functional assays (dye uptake) to assess receptor activity.

Main Results:

  • Western blot and immunofluorescence confirmed the presence of P2X(2), P2X(4), P2X(6), and P2X(7) subunits.
  • Functional studies indicated the presence of functional P2X(4) subunits and suggested heteromeric receptor involvement.
  • P2X(7) receptors were detected but found to be non-functional under the experimental conditions.

Conclusions:

  • Mouse Leydig cells express multiple P2X receptor subunits.
  • A functional heteromeric P2X channel, potentially P2X(2/4/6), is present in these cells.
  • This heteromeric channel exhibits electrophysiological and pharmacological properties resembling the P2X(2) subunit, contributing to Leydig cell function.

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