Artículos de revistas
Safranine As A Fluorescent Probe For The Evaluation Of Mitochondrial Membrane Potential In Isolated Organelles And Permeabilized Cells
Registro en:
9781617793813
Methods In Molecular Biology. , v. 810, n. , p. 103 - 117, 2012.
10643745
10.1007/978-1-61779-382-0_7
2-s2.0-82355170968
Autor
Figueira T.R.
Melo D.R.
Vercesi A.E.
Castilho R.F.
Institución
Resumen
The mitochondrial electrical membrane potential (Δψ) is the main component of the proton motive force (Δp) generated across the inner mitochondrial membrane during electron flow through the respiratory chain. Among the techniques available to assess Δψ, methods that rely on the spectrophotofluorometric responses of dyes are widely employed for whole suspensions of isolated mitochondria or permeabilized cells. Safranine is one of the dyes currently used most often for this purpose. Safranine is a lipophilic cationic dye that undergoes optical shifts upon its potential-dependent distribution between the external medium and the intramitochondrial compartment and on its stacking to inner mitochondrial membrane anionic sites. The association between the optical changes of safranine and the membrane potential allows unknown Δψ values to be estimated from an equation describing their relationship. Here, we describe the use of safranine as a fluorescent indicator of Δψ in isolated mitochondria and digitonin-permeabilized cells. We present suitable conditions to employ safranine as a Δψ indicator. © 2012 Springer Science+Business Media, LLC. 810
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