Phagosomal acidification is not a prerequisite for intracellular multiplication of Legionella pneumophila in human monocytes.
نویسندگان
چکیده
Legionella pneumophila is able to multiply in a variety of eukaryotic cells. Contradictory results have been published on the significance of phagosomal acidification in the intracellular multiplication of Legionella species in monocytes. Therefore, we analyzed the phagosomal pH values in 2 different types of human monocytes throughout the intracellular-replication cycles of 2 Legionella species that have different rates of intracellular multiplication. Our results show that phagosomal acidification is not a prerequisite for intracellular replication of Legionella pneumophila in human monocytes.
منابع مشابه
Legionella pneumophila inhibits acidification of its phagosome in human monocytes
We used quantitative fluorescence microscopy to measure the pH of phagosomes in human monocytes that contain virulent Legionella pneumophila, a bacterial pathogen that multiplies intracellularly in these phagocytes. The mean pH of phagosomes that contain live L. pneumophila was 6.1 in 14 experiments. In the same experiments, the mean pH of phagosomes containing dead L. pneumophila averaged 0.8 ...
متن کاملDirect activation of human monocyte-derived macrophages by a bacterial glycoprotein extract inhibits the intracellular multiplication of virulent Legionella pneumophila serogroup 1.
Intracellular multiplication of virulent Legionella pneumophila serogroup 1 was inhibited by human monocyte-derived macrophages activated by a glycoprotein extract of Klebsiella pneumoniae, RU 41.740. Macrophage cultures were infected with L. pneumophila in the presence of immune antibodies on day 7 of culture. Extracellular bacteria were removed an hour after infection, and various concentrati...
متن کاملActivated Monocytes Inhibit Legionella Multiplication
Legionella pneumophila, the agent of Legionnaires' disease, is a facultative intracellular pathogen (1). The bacter ium multiplies intracellularly in human monocytes, and under tissue culture conditions, multiplication is exclusively intraeellular (1). In previous studies, we investigated the role of humoral immuni ty in Legionnaires ' disease (2, 3). We found that virulent in vivo grown L. pne...
متن کاملPhagocytosis of Legionella pneumophila is mediated by human monocyte complement receptors
We have examined receptors mediating phagocytosis of the intracellular bacterial pathogen, Legionella pneumophila. Three mAbs against the type 3 complement receptor (CR3), which recognizes C3bi, inhibit adherence of L. pneumophila to monocytes by 64 +/- 8% to 74 +/- 11%. An mAb against the type 1 complement receptor (CR1), which recognizes C3b, inhibits adherence by 68 +/- 1%. mAbs against othe...
متن کاملInteraction of the legionnaires' disease bacterium (Legionella pneumophila) with human phagocytes. II. Antibody promotes binding of L. pneumophila to monocytes but does not inhibit intracellular multiplication
In an accompanying paper (13), we reported that human polymorphonuclear leukocytes kill only a limited proportion (0.5 log) of an inoculum of Legionella pneumophila (Philadelphia 1 strain) in the presence of human anti-L. pneumophila antibody and complement. We now report on the effect of anti-L. pneumophila antibody on L. pneumophila-monocyte interaction. The studies were carried out under ant...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- The Journal of infectious diseases
دوره 189 9 شماره
صفحات -
تاریخ انتشار 2004