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- W2120131808 abstract "Microbial growth in moisture-damaged buildings is associated with respiratory and other symptoms in the occupants. Streptomyces spp. are frequently isolated from such buildings. In the present study, we evaluated the responses of mice after repeated exposure to spores of Streptomyces californicus. Mice were exposed via intratracheal instillation to six doses (at 7-day intervals) of the spores of S. californicus, originally isolated from the indoor air of a moisture-damaged building, at three dose levels (2 x 10(3), 2 x 10(5), and 2 x 10(7) spores). Inflammation and toxicity, including changes in cell populations in the lungs, lymph nodes, and spleen, were evaluated 24 h after the last dosage. The exposure provoked a dose-dependent inflammatory cell response, as detected by the intense recruitment of neutrophils, but the numbers of macrophages and lymphocytes in the airways also increased. The cellular responses corresponded to the dose-dependent increases in inflammation- and cytotoxicity-associated biochemical markers (i.e., levels of albumin, total protein, and lactate dehydrogenase) in bronchoalveolar lavage fluid. The spore exposure increased the number of both activated and nonactivated T lymphocytes. Also, the amounts of CD3(-) CD4(-) and unconventional CD3(-) CD4(+) lymphocytes in the lung tissue were augmented. Interestingly, the spore exposure decreased cells in the spleen. This effect was strongest at the dose of 2 x 10(5) spores. These results indicate that the spores of S. californicus are capable of provoking both immunostimulation in lungs (inflammation) and systemic immunotoxicity, especially in the spleen. The immunotoxic effect resembled that caused by chemotherapeutic agents, originally isolated from Streptomyces spp. Thus, S. californicus must be considered a microbial species with potential to cause systemic adverse health effects in occupants of moisture-damaged buildings." @default.
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- W2120131808 date "2003-01-01" @default.
- W2120131808 modified "2023-10-17" @default.
- W2120131808 title "Systemic Immunoresponses in Mice after Repeated Exposure of Lungs to Spores of <i>Streptomyces californicus</i>" @default.
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- W2120131808 doi "https://doi.org/10.1128/cdli.10.1.30-37.2003" @default.
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