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Is there a Na+/Ca2+ exchanger in macrophages and in lymphocytes?

E Donnadieu1, A Trautmann

  • 1Laboratoire de Neurobiologie, CNRS URA 295, Paris, France.

Pflugers Archiv : European Journal of Physiology
|September 1, 1993
PubMed

Insights

Macrophages utilize sodium-calcium exchange (Na+/Ca2+) to extrude calcium after stimulation, while T lymphocytes do not exhibit this activity. This ion transport is crucial for calcium homeostasis in macrophages.

Area of Science:

  • Cellular Physiology
  • Ion Transport Mechanisms
  • Immunology

Background:

  • Calcium ions (Ca2+) are critical intracellular messengers regulating numerous cellular processes.
  • Sodium-calcium exchangers (Na+/Ca2+) play vital roles in maintaining calcium homeostasis across cell membranes.
  • Understanding Na+/Ca2+ activity in different blood cell types is essential for elucidating their physiological functions.

Purpose of the Study:

  • To investigate the presence and functional significance of Na+/Ca2+ exchange in peritoneal murine macrophages and human Jurkat T cells.
  • To determine the role of Na+/Ca2+ exchange in regulating intracellular calcium concentrations ([Ca2+]i) following cellular stimulation.

Main Methods:

  • Utilized patch-clamp electrophysiology to measure membrane potential.
  • Employed fura-2 for intracellular calcium concentration ([Ca2+]i) measurements.
  • Assessed intracellular sodium concentration using sodium-binding benzofuran isophthalate.

Main Results:

  • Macrophages exhibit functional Na+/Ca2+ exchange that actively extrudes Ca2+ upon stimulation (e.g., by platelet-activating factor, PAF).
  • This Ca2+ extrusion via Na+/Ca2+ exchange is dependent on elevated intracellular Ca2+ levels.
  • No detectable Na+/Ca2+ activity was observed in Jurkat T lymphocytes, even after anti-CD3 antibody stimulation.

Conclusions:

  • Peritoneal macrophages possess a functional Na+/Ca2+ exchanger that acts as a Ca2+ extruder, particularly after stimulation.
  • Jurkat T lymphocytes lack detectable Na+/Ca2+ exchange activity, suggesting cell-type-specific regulation of calcium transport.
  • The findings highlight the differential roles of Na+/Ca2+ exchange in immune cell calcium signaling.

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