2016年2月
Streptococcus pyogenes CAMP factor attenuates phagocytic activity of RAW 264.7 cells
MICROBES AND INFECTION
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- 巻
- 18
- 号
- 2
- 開始ページ
- 118
- 終了ページ
- 127
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.micinf.2015.10.003
- 出版者・発行元
- ELSEVIER SCIENCE BV
Streptococcus pyogenes produces molecules that inhibit the function of human immune system, thus allowing the pathogen to grow and spread in tissues. It is known that S. pyogenes CAMP factor increases erythrocytosis induced by Staphylococcus aureus beta-hemolysin. However, the effects of CAMP factor for immune cells are unclear. In this study, we investigated the effects of CAMP factor to macrophages. Western blotting analysis demonstrated that all examined strains expressed CAMP factor protein. In the presence of calcium or magnesium ion, CAMP factor was significantly released in the supernatant. In addition, both culture supernatant from S. pyogenes strain SSI-9 and recombinant CAMP factor dose-dependently induced vacuolation in RAW 264.7 cells, but the culture supernatant from Delta cfa isogenic mutant strain did not. CAMP factor formed oligomers in RAW 264.7 cells in a time-dependent manner. CAMP factor suppressed cell proliferation via G2 phase cell cycle arrest without inducing cell death. Furthermore, CAMP factor reduced the uptake of S. pyogenes and phagocytic activity indicator by RAW 264.7 cells. These results suggest that CAMP factor works as a macrophage dysfunction factor. Therefore, we conclude that CAMP factor allows S. pyogenes to escape the host immune system, and contribute to the spread of streptococcal infection. (C) 2015 Institut Pasteur. Published by Elsevier Masson SAS. All rights reserved.
- リンク情報
- ID情報
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- DOI : 10.1016/j.micinf.2015.10.003
- ISSN : 1286-4579
- eISSN : 1769-714X
- Web of Science ID : WOS:000370375400006