Simultaneous analysis of intracellular pH and Ca2+ from cell populations.

Raul Martinez-Zaguilan, Linda S. Tompkins, Robert J. Gillies, Ron Lynch

Research output: Contribution to journalArticle

Abstract

Although changes in both pH(in) and [Ca(2+)](i) have been observed in response to a variety of agonists, it is not clear whether these ionic events work independently or are coordinated to lead to a specific physiological response. One of the fundamental problems in studying these ionic events is that changes in pH(in) modify Ca(2+) regulatory mechanisms and changes in Ca(2+) may modify pH regulation. It is desirable to use a technique that allows concomitant monitoring of these two ions in cell populations with high time resolution. Furthermore, like many Ca(2+) binding proteins, all Ca(2+)-sensitive fluoroprobes are inherently sensitive to pH owing to competition of H(+) for the Ca(2+)-binding sites. This chapter describes experimental paradigms that provide optimum conditions for simultaneous measurement of pH from the fluorescence emission of snarf-1, and Ca(2+) using fura-2. The fluorescence spectra of these compounds are sufficiently different to allow simultaneous measurement of pH and Ca(2+) both in vitro and in vivo. Moreover, the ratio of the H(+)-sensitive wavelengths of snarf-1 is unaffected by Ca(2+), or the concomitant presence of fura-2 in cells. Although the fluorescence ratio of fura-2 is insensitive to the presence of snarf-1, it is affected by pH, as indicated above. We describe procedures to correct for this effect and to obtain calibration parameters for fura-2 and snarf-1 required to facilitate analysis of pH and Ca(2+) concentrations within cell populations.

Original languageEnglish (US)
Pages (from-to)253-271
Number of pages19
JournalMethods in molecular biology (Clifton, N.J.)
Volume937
StatePublished - 2013
Externally publishedYes

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Population
Fura-2
Fluorescence
Calibration
Binding Sites
Ions

ASJC Scopus subject areas

  • Medicine(all)

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Simultaneous analysis of intracellular pH and Ca2+ from cell populations. / Martinez-Zaguilan, Raul; Tompkins, Linda S.; Gillies, Robert J.; Lynch, Ron.

In: Methods in molecular biology (Clifton, N.J.), Vol. 937, 2013, p. 253-271.

Research output: Contribution to journalArticle

Martinez-Zaguilan, Raul ; Tompkins, Linda S. ; Gillies, Robert J. ; Lynch, Ron. / Simultaneous analysis of intracellular pH and Ca2+ from cell populations. In: Methods in molecular biology (Clifton, N.J.). 2013 ; Vol. 937. pp. 253-271.
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