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Related Experiment Video

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Trypan blue exclusion assay by flow cytometry.

B A Avelar-Freitas1, V G Almeida1, M C X Pinto2

  • 1Laboratório de Imunologia, Departamento de Farmácia, Universidade Federal dos Vales do Jequitinhonha e Mucuri and Programa Multicêntrico de Pós-graduação em Ciências Fisiológicas, Diamantina, MG, Brasil.

Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
|March 22, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a flow cytometry method using trypan blue (TB) to reliably assess cell viability. This enhanced assay overcomes limitations of traditional TB tests, offering a quick and accurate alternative for cell analysis.

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Area of Science:

  • Cell Biology
  • Immunology
  • Biotechnology

Background:

  • Dye exclusion assays, like trypan blue (TB), are standard for determining cell viability.
  • Traditional TB assays have limitations, including dye uptake by live cells and analyst variability.
  • Flow cytometry offers high sensitivity for cell analysis.

Purpose of the Study:

  • To develop an alternative cell viability assay combining TB exclusion and flow cytometry.
  • To address limitations of conventional TB assays for improved reliability and speed.
  • To validate the use of TB-protein complexes' fluorescence for cell viability detection.

Main Methods:

  • Utilized flow cytometry to detect fluorescence emitted by TB-protein complexes (TB/bovine serum albumin, TB/cytoplasmic proteins) at 660 nm.
  • Optimized TB concentration to 0.002% (w/v) for distinguishing live (unstained) from dead (fluorescent) cells.
  • Assessed TB's compatibility with green fluorescence markers (anti-CD3/FITC) in human T-cells.

Main Results:

  • TB-protein complexes showed stable fluorescence emission at 660 nm for 30 minutes.
  • Optimized TB concentration effectively differentiated live and dead cells without quenching green fluorescence.
  • High correlation observed between TB+ and propidium iodide+ cells, validating the assay.

Conclusions:

  • A flow cytometry-based TB exclusion assay provides a quick and reliable method for cell viability analysis.
  • This method overcomes limitations of traditional TB assays, enhancing accuracy and reducing subjectivity.
  • The assay is compatible with multicolor flow cytometry, expanding its utility in cell research.