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Multiple mechanisms of manganese-induced quenching of fura-2 fluorescence in rat mast cells

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Abstract

Whole-cell patch-clamp recordings of membrane currents and fura-2 measurements of free intracellular calcium concentration ([Ca2+]i) were used to study Mn2+ influx in rat peritoneal mast cells. The calcium-selective current, activated by depletion of intracellular calcium stores (I CRAC for calcium release-activated calcium current), supports a small but measurable Mn2+ current. In the presence of intracellular BAPTA, a Mn2+ current through I CRAC was recorded in isotonic MnCl2 (100 mM) without a significant quenching of fura-2 fluorescence. Its amplitude was 10% of that measured in physiological solution containing 10 mM Ca2+. However, following store depletion, a significant quenching of fura-2 fluorescence could be measured only when intracellular BAPTA was omitted, so that all the incoming Mn2+ could be captured by the fluorescent dye. Two other ionic currents activated by receptor stimulation also induced Mn2+ quenching of fura-2 fluorescence: a small current through non-specific cation channels of 50-pS unitary conductance and a distinct cationic current of large amplitude. In addition to these influx mechanisms, Mn2+ was taken up into calcium stores and was subsequently co-released with Ca2+ by Ca2+-mobilizing agonists.

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Author notes

  1. Cristina Fasolato

    Present address: Dip. di Scienze Biomediche, Università di Padova, Via Trieste 75, 35121, Padova, Italy

Authors and Affiliations

  1. Department of Membrane Biophysics, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg, W-3400, Göttingen, Germany

    Cristina Fasolato, Markus Hoth & Reinhold Penner

Authors
  1. Cristina Fasolato
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  2. Markus Hoth
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  3. Reinhold Penner
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Fasolato, C., Hoth, M. & Penner, R. Multiple mechanisms of manganese-induced quenching of fura-2 fluorescence in rat mast cells. Pflugers Arch. 423, 225–231 (1993). https://doi.org/10.1007/BF00374399

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  • DOI: https://doi.org/10.1007/BF00374399

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