Behavior of New Type of Rock Wool (HT Wool) in Lungs after Exposure by Nasal Inhalation in Rats

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  • KUDO Yuichiro
    Department of Preventive Medicine and Public Health, Kitasato University School of Medicine
  • SHIBATA Kaori
    Department of Preventive Medicine and Public Health, Kitasato University School of Medicine
  • MIKI Takeo
    Department of Preventive Medicine and Public Health, Kitasato University School of Medicine
  • ISHIBASHI Mio
    Department of Preventive Medicine and Public Health, Kitasato University School of Medicine
  • HOSOI Kaori
    Department of Preventive Medicine and Public Health, Kitasato University School of Medicine
  • SATO Toshihiko
    Department of Preventive Medicine and Public Health, Kitasato University School of Medicine
  • KOHYAMA Norihiko
    Faculty of Economy, Toyo University
  • AIZAWA Yoshiharu
    Department of Preventive Medicine and Public Health, Kitasato University School of Medicine

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Objectives: Previous types of rock wool has been recently replaced with high-temperature wool (HT wool). HT wool is characterized by a chemical composition with a higher concentration of Al2O3 and a lower concentration of SiO2, lower biopersistence, and a higher melting point than previous types of rock wool. To evaluate the safety of HT wool, an asbestos substitute, we examined the biopersistence of HT wool in the lungs, based on changes in fiber count according to the length and fiber size (length and width), by performing a nose-only inhalation exposure study in rats.<br> Methods: Male Fischer 344 rats were exposed to fibers at the target exposure concentration of 30 mg/m3 continuously for 3 hours daily for 5 consecutive days. Rats were sacrificed shortly after exposure, and 1, 2, and 4 weeks after exposure, and their lung tissues were incinerated at a low temperature. Then, fiber counts and sizes in the lungs were analyzed using a phase contrast microscope.<br> Results: The fiber count in the lungs 4 weeks after exposure significantly decreased from the baseline value (shortly after exposure). The half-life of fibers calculated from the approximation curve was 34 days for all fibers and 11 days for fibers longer than 20 μm.<br> Conclusions: Both the length and width significantly decreased 4 weeks after exposure, probably because fibers were ingested by alveolar macrophages, discharged to outside of the body by mucociliary movement, or lysed by body fluid. In future studies, it is necessary to examine the long-term persistence of fibers in the lungs.<br>

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