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The effect of N-nitrosodimethylamine (NDMA) on Bax and Mcl-1 expression in human neutrophils

Jakub Jablonski1, Ewa Jablonska, Agnieszka Leonik

  • 1Department of Toxicology, Medical University of Bialystok, Mickiewicza 2c, 15-222, Bialystok, Poland. toksykologia@wp.pl

Bulletin of Environmental Contamination and Toxicology
|September 28, 2011
PubMed

Insights

N-nitrosodimethylamine (NDMA) exposure induces apoptosis in human neutrophils (PMNs) by altering Bax and Mcl-1 protein levels. Neutrophils are more sensitive to NDMA-induced apoptosis than peripheral blood mononuclear cells (PBMCs).

Area of Science:

  • Cellular and Molecular Biology
  • Toxicology
  • Immunology

Background:

  • The intrinsic apoptosis pathway is crucial for cellular homeostasis and is regulated by proteins like Bax and Mcl-1.
  • N-nitrosodimethylamine (NDMA) is an environmental xenobiotic with known toxic effects.
  • Human neutrophils (PMNs) and peripheral blood mononuclear cells (PBMCs) play distinct roles in immunity and cellular defense.

Purpose of the Study:

  • To investigate the role of pro-apoptotic Bax and anti-apoptotic Mcl-1 proteins in the intrinsic apoptosis pathway of human neutrophils (PMNs) exposed to NDMA.
  • To compare the sensitivity of PMNs and PBMCs to NDMA-induced apoptosis.
  • To determine the effect of NDMA on cytochrome c production in PMNs.

Main Methods:

  • Exposure of human PMNs and PBMCs to NDMA.
  • Analysis of Bax and Mcl-1 protein expression levels.
  • Measurement of cytochrome c production in PMNs.

Main Results:

  • NDMA exposure led to a deficit of anti-apoptotic Mcl-1 and overexpression of pro-apoptotic Bax in human neutrophils.
  • These changes in Bax and Mcl-1 expression suggest NDMA-induced apoptosis in PMNs is dependent on these proteins.
  • Human neutrophils (PMNs) exhibited higher sensitivity to NDMA-induced apoptosis compared to PBMCs.

Conclusions:

  • The expression levels of Bax and Mcl-1 proteins are key regulators of NDMA-induced apoptosis in human neutrophils.
  • Human neutrophils are more susceptible to the apoptotic effects of NDMA than PBMCs, highlighting differential cellular responses to xenobiotic exposure.

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