Skip to Content
Merck
  • Prolonged exposure to neutrophil extracellular traps can induce mitochondrial damage in macrophages and dendritic cells.

Prolonged exposure to neutrophil extracellular traps can induce mitochondrial damage in macrophages and dendritic cells.

SpringerPlus (2015-04-18)
Luis Donis-Maturano, Luvia E Sánchez-Torres, Arturo Cerbulo-Vázquez, Rommel Chacón-Salinas, Gina S García-Romo, Mariana C Orozco-Uribe, Juan C Yam-Puc, Marco A González-Jiménez, Yuriria L Paredes-Vivas, Juana Calderón-Amador, Sergio Estrada-Parra, Iris Estrada-García, Leopoldo Flores-Romo
ABSTRACT

Neutrophils are one the earliest, crucial innate defenses against innumerable pathogens. Their main microbicidal activities include phagocytosis and degranulation, with many pharmacologically active molecules contributing to inflammation. Recently, a novel antimicrobial mechanism was discovered; the Neutrophil Extracelullar Traps (NETs) formed by extrusion of DNA and associated molecules (histones, elastase, antimicrobial peptides, among others) which trap and kill microorganisms. Since NETs were recently described, research has focused on their induction and microbicidal properties, and recently on disease involvement. However, the functional consequences of NETs interacting with other immune cells, either resident or recruited during early inflammation, have not been assessed. We therefore investigated the consequences of exposing two major APCs, macrophages (Mfs) and conventional Dendritic Cells (cDCs) to NETs. Our data revealed that at early times (30 min), both Antigen Presenting Cells (APCs) showed induction of important costimulatory molecules (CD80, CD86). Unexpectedly, however, at later times (6 and 24 hours) NETs apparently triggered a cell death process in these APCs by a caspase- and Apoptosis induced factor (AIF)-dependent pathway, suggesting mitochondrial damage. By rhodamine-123 labelling we found that in both APCs, relatively prolonged exposure to NETs or their components importantly decreased the mitochondrial membrane potential. Ultrastructural analysis confirmed mitochondrial alterations in both APCs. Our results would suggest that early in inflammation, NETs can activate the two main APCs (Mfs and cDCs), but as the process continues, NETs can then initiate apoptosis of these cells through mitochondrial harm. Conceivable, this "late" induction of cell death in these two APCs might start limiting an ongoing inflammatory process to control it.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
HEPES, anhydrous, free-flowing, Redi-Dri, ≥99.5%
Sigma-Aldrich
Sodium chloride, BioPerformance Certified, ≥99% (titration), suitable for insect cell culture, suitable for plant cell culture
Sigma-Aldrich
Sodium chloride solution, 0.85%
Sigma-Aldrich
Cathepsin G from human leukocytes, lyophilized powder, ≥60 units/mg protein (Bradford)
Sigma-Aldrich
Phorbol 12-myristate 13-acetate, ≥99% (TLC), film or powder
Sigma-Aldrich
PMA, for use in molecular biology applications, ≥99% (HPLC)
Sigma-Aldrich
Sodium chloride solution, 5 M
Sigma-Aldrich
Sodium chloride solution, 5 M in H2O, BioReagent, for molecular biology, suitable for cell culture
Sigma-Aldrich
HEPES, ≥99.5% (titration)
Sigma-Aldrich
Sodium chloride, for molecular biology, DNase, RNase, and protease, none detected, ≥99% (titration)
Sigma-Aldrich
Sodium chloride, BioReagent, suitable for cell culture, suitable for insect cell culture, suitable for plant cell culture, ≥99%
Sigma-Aldrich
Sodium chloride, meets analytical specification of Ph. Eur., BP, USP, 99.0-100.5%
Sigma-Aldrich
Sodium chloride, tablet
Sigma-Aldrich
HEPES, BioPerformance Certified, ≥99.5% (titration), suitable for cell culture
Sigma-Aldrich
Sodium chloride, BioXtra, ≥99.5% (AT)
Sigma-Aldrich
HEPES, BioXtra, suitable for mouse embryo cell culture, ≥99.5% (titration)
Sigma-Aldrich
Sodium chloride solution, 0.9% in water, BioXtra, suitable for cell culture
Sigma-Aldrich
HEPES, BioXtra, pH 5.0-6.5 (1 M in H2O), ≥99.5% (titration)
Sigma-Aldrich
Sodium chloride, BioUltra, for molecular biology, ≥99.5% (AT)
Sigma-Aldrich
Sodium chloride solution, BioUltra, for molecular biology, ~5 M in H2O
Sigma-Aldrich
HEPES, BioUltra, for molecular biology, ≥99.5% (T)
Sigma-Aldrich
Sodium chloride, AnhydroBeads, −10 mesh, 99.999% trace metals basis
Sigma-Aldrich
Sodium chloride-35Cl, 99 atom % 35Cl
Sigma-Aldrich
Sodium chloride, random crystals, optical grade, 99.9% trace metals basis
Sigma-Aldrich
Sodium chloride, 99.999% trace metals basis
Sigma-Aldrich
Phorbol 12-myristate 13-acetate, synthetic, ≥98.0% (TLC)
SAFC
HEPES
SAFC
HEPES
SAFC
Sodium chloride solution, 5 M
Sigma-Aldrich
L-Glutamine