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Phagocytic activity of LPS tolerant macrophages
- Source :
- Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual), Universidade de São Paulo (USP), instacron:USP
- Publication Year :
- 2014
- Publisher :
- Elsevier BV, 2014.
-
Abstract
- Endotoxin tolerance is defined as a reduced capacity of the host to respond to LPS activation following a first exposure to this stimulus. It affects all leukocytes and regarding macrophages, most studies focus on the reduced ability of these cells to secrete pro-inflammatory cytokines. Therefore, we evaluated other macrophages functions (fungicidal capacity, reactive oxygen species production and antigen presentation) in cells from tolerant mice. We have performed a tolerance model in our laboratory that does not stimulate directly the place from where the cells will be removed (peritoneal cavity). Mouse received subcutaneous injections of LPS in the scruff for 5 days and we analyze the capacity of peritoneal macrophages to phagocyte using three different receptors: Fc, C3b and mannose receptors. We found a reduction in the phagocytosis of erythrocytes and Candida albicans related to the Fc and mannose receptors. These differences can be due to a macrophage reprogramming, as demonstrated by altered expression of cytokines and chemokines. Despite this reduction in phagocytosis capacity, macrophages from tolerant animals exhibited enhanced hydrogen peroxide production and expression of antigen presentation molecules, suggesting that their ability to combat an infection is improved. In summary, our data indicates that LPS tolerance drives macrophages from a predominant release of proinflammatory mediators that amplify inflammation and host damage toward a better killing and antigen presentation state.
- Subjects :
- Lipopolysaccharides
Male
Chemokine
Erythrocytes
Phagocyte
Phagocytosis
Immunology
Antigen presentation
Receptors, Cell Surface
Inflammation
Receptors, Fc
Microbiology
Proinflammatory cytokine
Mice
Peritoneal cavity
Candida albicans
Immune Tolerance
medicine
Animals
Lectins, C-Type
Receptor
Molecular Biology
Antigen Presentation
Mice, Inbred BALB C
biology
Macrophages
Hydrogen Peroxide
FAGOCITOSE
Mannose-Binding Lectins
medicine.anatomical_structure
Receptors, Complement 3b
biology.protein
medicine.symptom
Reactive Oxygen Species
Mannose Receptor
Subjects
Details
- ISSN :
- 01615890
- Volume :
- 60
- Database :
- OpenAIRE
- Journal :
- Molecular Immunology
- Accession number :
- edsair.doi.dedup.....a4a65f9de07f1b9d509ca7782fca34f4