Innate immune-stimulatory activity of Porphyromonas gingivalis fimbriae is eliminated by phase separation using Triton X-114
| Autor: | Akira Haraguchi, Terukazu Sanui, Kohji Nozoe, Fusanori Nishimura, Masaaki Takeshita, Yoshitomi Aida, Takao Fukuda |
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| Rok vydání: | 2017 |
| Předmět: |
Lipopolysaccharides
0301 basic medicine Neutrophils Octoxynol Immunology Fimbria Chemical Fractionation Biology Peripheral blood mononuclear cell Polyethylene Glycols Microbiology 03 medical and health sciences 0302 clinical medicine Humans Immunology and Allergy Receptor Porphyromonas gingivalis Respiratory Burst Innate immune system biochemical phenomena metabolism and nutrition biology.organism_classification Immunity Innate Respiratory burst Endotoxins Toll-Like Receptor 4 030104 developmental biology CD18 Antigens Fimbriae Bacterial TLR4 Cytokines bacteria Tumor necrosis factor alpha Signal Transduction 030215 immunology |
| Zdroj: | Journal of Immunological Methods. 441:31-38 |
| ISSN: | 0022-1759 |
| DOI: | 10.1016/j.jim.2016.11.012 |
| Popis: | Fimbriae are virulence factors of Porphyromonas gingivalis ( P. gingivalis ). In this study, the action of fimbriae on neutrophil respiratory burst and cytokine production by mononuclear cells (MNC) were investigated. Native or denatured form of purified P. gingivalis fimbriae contained endotoxin at an equivalence of 1– 3 μg lipopolysaccharides (LPS)/mg protein. The endotoxin could be reduced to the equivalent of 1 ng-LPS/mg protein by phase separation using Triton X-114. Unfractionated fimbriae caused serum-dependent priming of neutrophils for enhanced respiratory burst, but both native and denatured forms of Triton X-114-fractionated fimbriae were not active at 100 μg/mL. Unfractionated fimbriae induced serum-dependent production of IL-1β by MNC. Triton X-114-fractionated fimbriae (10 μg/mL)-induced production of IL-1β, IL-8 or TNF-α was much lower than that induced by unfractionated fimbriae or 10 ng/mL P. gingivalis -LPS preparation. Triton X-114-fractionated fimbriae immobilized on polystyrene tubes induced adhesion-stimulated superoxide release by LPS-primed neutrophils in a β 2 integrin-dependent manner. P. gingivalis cells caused priming of neutrophils; however, Toll-like receptor (TLR) 4 antagonists did not affect this response. Thus, P. gingivalis fimbriae were ineffective in inducing innate immune response in leukocytes; however, they induced β 2 integrin-mediated response by neutrophils. Immune-stimulatory components of P. gingivalis might be recognized by receptors other than TLR4. |
| Databáze: | OpenAIRE |
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