Fine structural detection of calcium ions by photoconversion

Submitted: 17 June 2016
Accepted: 5 July 2016
Published: 10 August 2016
Abstract Views: 1036
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Supplementary: 228
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We propose a tool for a rapid high-resolution detection of calcium ions which can be used in parallel with other techniques. We have applied a new approach by  photo-oxidation of diaminobenzidine in presence of the emission of an excited fluorochrome specific for calcium detection. This method combines the selectivity of available fluorophores to the high spatial resolution offered by transmission electron microscopy to detect even fluorescing molecules even when present in low amounts in membrane-bounded organelles. We show in this paper that Mag-Fura 2 photoconversion via diaminobenzidine oxidation is an efficient way for localizing Ca2+ ions at EM level, is easily carried out and reproducible, and can be obtained on a good amount of cells, since the exposition in our conditions is not limited to the direct irradiation of the sample via an objective but obtained with a germicide lamp. The end product is sufficiently electron dense to be detected clearly when present in sufficient amount within a membrane boundary.

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M. Biggiogera, University of Pavia

Dipartimento di Biologia e Biotecnologie "Lazzaro Spallanzani"

How to Cite

Poletto, V., Galimberti, V., Guerra, G., Rosti, V., Moccia, F., & Biggiogera, M. (2016). Fine structural detection of calcium ions by photoconversion. European Journal of Histochemistry, 60(3). https://doi.org/10.4081/ejh.2016.2695