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Type: Artigo de periódico
Title: Method for monitoring of mitochondrial cytochrome c release during cell death: Immunodetection of cytochrome c by flow cytometry after selective permeabilization of the plasma membrane
Author: Campos, CBL
Paim, BA
Cosso, RG
Castilho, RF
Rottenberg, H
Vercesi, AE
Abstract: Background: Cytochrome c release from mitochondria to cytosol is a hallmark of apoptosis and is used to characterize the mutochondria-dependent pathway of this type of cell death. Techniques currently used to measure cytochrome c release, Western blot and fluorescence microscopy of imnumolabeled cells, are time-consuming and inaccurate. and the latter is still limited by sample size. Methods: We developed a rapid and reliable technique to detect cytochrome c release during drug-induced apoptosis, using flow cytometry. Plasma membrane of apoptotic HL-60 cells and thymocytes, treated with staurosporine and dexamethasone. respectively, were selectively permeabilized by digitonin at a low concentration. The released cytochrome c vas quickly washed out from cells and that which remained in the mitochondria was immunolabeled after fixing the cells. Results: The fraction of cells that retained their mitochondrial cytochrome c, or the highly fluorescent cells, gradually decreased so that after 4-8 h of drug treatment almost all the cells lost their cytochrome c and emerged as a population of low fluorescent cells. This was confirmed by parallel fluorescence microscopy of cells immunolabeled for cytochrome c. Conclusions: This technique allows the analysis of cytochrome c release from mitochondria of a large number of apoptotic cells in a short period of time and is proposed as an alternative to the methods Currently used for this same purpose.(c) 2006 International Society for Analytical Cytology.
Subject: apoptosis
cytochrome c
flow cytometry
Country: EUA
Editor: Wiley-liss
Citation: Cytometry Part A. Wiley-liss, v. 69A, n. 6, n. 515, n. 523, 2006.
Rights: fechado
Identifier DOI: 10.1002/cyto.a.20273
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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