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Presynaptic localization of sodium/calcium exchangers in neuromuscular preparations

PW Luther, RK Yip, RJ Bloch, A Ambesi, GE Lindenmayer and MP Blaustein
Journal of Neuroscience 1 December 1992, 12 (12) 4898-4904; https://doi.org/10.1523/JNEUROSCI.12-12-04898.1992
PW Luther
Department of Physiology, University of Maryland, School of Medicine, Baltimore 21201.
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RK Yip
Department of Physiology, University of Maryland, School of Medicine, Baltimore 21201.
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RJ Bloch
Department of Physiology, University of Maryland, School of Medicine, Baltimore 21201.
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A Ambesi
Department of Physiology, University of Maryland, School of Medicine, Baltimore 21201.
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GE Lindenmayer
Department of Physiology, University of Maryland, School of Medicine, Baltimore 21201.
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MP Blaustein
Department of Physiology, University of Maryland, School of Medicine, Baltimore 21201.
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Abstract

Calcium ions play a critical role in neurotransmitter release. The cytosolic Ca2+ concentration ([Ca2+]cyt) at nerve terminals must therefore be carefully controlled. Several different mechanisms, including a plasmalemmal Na/Ca exchanger, are involved in regulating [Ca2+]cyt. We employed immunofluorescence microscopy with polyclonal antiserum raised against dog cardiac sarcolemmal Na/Ca exchanger to determine the distribution of the exchanger in vertebrate neuromuscular preparations. Our data indicate that the Na/Ca exchanger is concentrated at the neuromuscular junctions of the rat diaphragm. The exchanger is also present in the nonjunctional sarcolemma, but at a much lower concentration than in the junctional regions. Denervation markedly lowers the concentration of the exchanger in the junctional regions; this implies that the Na/Ca exchanger is concentrated in the presynaptic nerve terminals. In Xenopus laevis nerve and muscle cell cocultures, high concentrations of the exchanger are observed along the neurites as well as at the nerve terminals. The high concentrations of Na/Ca exchanger at presynaptic nerve terminals in vertebrate neuromuscular preparations suggest that the exchanger may participate in the Ca-dependent regulation of neurotransmitter release. The Na/Ca exchanger is also abundant in developing neurites and growth cones, where it may also be important for Ca2+ homeostasis.

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The Journal of Neuroscience: 12 (12)
Journal of Neuroscience
Vol. 12, Issue 12
1 Dec 1992
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Presynaptic localization of sodium/calcium exchangers in neuromuscular preparations
PW Luther, RK Yip, RJ Bloch, A Ambesi, GE Lindenmayer, MP Blaustein
Journal of Neuroscience 1 December 1992, 12 (12) 4898-4904; DOI: 10.1523/JNEUROSCI.12-12-04898.1992

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Presynaptic localization of sodium/calcium exchangers in neuromuscular preparations
PW Luther, RK Yip, RJ Bloch, A Ambesi, GE Lindenmayer, MP Blaustein
Journal of Neuroscience 1 December 1992, 12 (12) 4898-4904; DOI: 10.1523/JNEUROSCI.12-12-04898.1992
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