Abstract
Stachylysin is a proteinaceous hemolytic agent that is produced by Stachybotrys chartarum. Stachylysin was found, using immunohistochemical and immunocytochemical methods, to be localized in S. chartarum spores/mycelia primarily in the inner wall suggesting that it is constitutively produced. Spores instilled in mouse or rat lung tissues resulted in granuloma formation, which showed the highest stachylysin concentration in the inner wall of the spore and near the spore, with less at distance indicating that it had diffused out from the spore. The in vitro high stachylysin producing strain (58-06) was also highest in vivo, based on immunohistochemistical staining. More stachylysin was observed in the mouse lung tissue at 72 h than at 24 h indicating that production/release is a relatively slow process. The localization of stachylysin in macrophage phagolysosomes suggests that these cells may be involved with hemolysin inactivation. This would be consistent with what is known about asp-hemolysin produced by Aspergillus fumigatus.
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