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[Improved MTT colorimetric assay for NKC activity]

P Zhang1, C Zhang, J Liu

  • 1Department of Immunology, School of Basic Medical Sciences, Chengdu.

Hua Xi Yi Ke Da Xue Xue Bao = Journal of West China University of Medical Sciences = Huaxi Yike Daxue Xuebao
|June 1, 1996
PubMed
Summary

The improved 3-(4,5-dimethyl thiazoly)2,5-diphenyl-tetrazolium bromide (MTT) colorimetric assay accurately measures natural killer cell (NKC) activity in human peripheral blood. This method is a convenient, isotope-free alternative for assessing NKC function in both healthy individuals and leukemia patients.

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Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • The 3-(4,5-dimethyl thiazoly)2,5-diphenyl-tetrazolium bromide (MTT) colorimetric assay is an established method for quantifying cell viability and function.
  • Assessing natural killer cell (NKC) activity is crucial for understanding immune responses and diagnosing conditions like leukemia.
  • Existing methods for NKC activity assessment may involve isotopes, posing handling and disposal challenges.

Purpose of the Study:

  • To evaluate an improved MTT colorimetric assay for measuring human peripheral blood NKC activity.
  • To establish the reliability and repeatability of the MTT assay for NKC function assessment.
  • To compare the MTT assay results with a traditional 3H-TdR incorporation assay and assess its utility in clinical settings.

Main Methods:

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  • Utilized an improved MTT colorimetric assay to measure NKC activity in human peripheral blood samples.
  • Determined optimal effector cell (EC) and target cell (TC) densities and ratios for reliable assay performance.
  • Correlated MTT assay results with cell viability and established NKC activity benchmarks.
  • Compared MTT assay findings with results from the 3H-TdR incorporation inhibition assay.

Main Results:

  • The improved MTT assay demonstrated simplicity, dependability, and good repeatability within 3-12 hours.
  • Positive correlations were observed between living cell numbers and MTT formazan product (re = 0.94, ri = 0.97, P < 0.001) under specific EC and TC densities.
  • NKC activity in healthy adults measured by MTT assay aligned with previously reported values.
  • MTT assay results for NKC activity in 10 leukemia patients (mean +/- s: 34.86 +/- 7.80%) showed a strong positive correlation with the 3H-TdR incorporation assay (35.16 +/- 8.40%, r = 0.876, P < 0.001).

Conclusions:

  • The improved MTT colorimetric assay is a reliable and repeatable method for quantifying NKC activity in human peripheral blood.
  • This assay provides a convenient and valuable alternative to isotope-based methods for assessing NKC function.
  • The MTT assay is suitable for evaluating NKC activity in both healthy individuals and patients with conditions such as leukemia.