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Silica-Induced Immunotoxicity: Chronic and Aberrant Activation of Immune Cells

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Allergy and Immunotoxicology in Occupational Health

Abstract

Occupational and chronic exposure to silica particles causes pulmonary fibrosis known as silicosis, which is a typical form of pneumoconiosis. Although the respiratory complications of silicosis include pulmonary tuberculosis, pleurisy, bronchitis, and other disorders such as lung cancer, silicosis (SIL) patients often suffer from complications of autoimmune diseases such as rheumatoid arthritis (RA), systemic sclerosis (SSc), and other forms of these conditions. The mechanisms causing impairment of immunity by silica exposure were considered adjuvant effects of these particles, and we have been investigating the direct effects of particles on immune cells, particularly T cells, and found chronic activation of both responder and regulatory T helper cells. The results of chronic activation indicated that responder T cells obtain resistance against CD95/Fas-mediated apoptosis to survive longer, whereas regulatory T cells become prone to CD95/Fas-mediated apoptosis and die quickly. These findings suggest that the imbalance of these cells may initiate the observed autoimmune disorders. Furthermore, various autoantibodies were detected in the serum of SIL without any symptoms of autoimmune diseases. Further investigation is needed to study the effects of silica on other immune cell types such as Th17, dendritic, and B cells. Adequate preventive tools against the progression of immunological impairments are also required to improve occupational health.

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Acknowledgments

The authors thank former colleagues in the Department of Hygiene, Kawasaki Medical School, namely, Prof. Ayako Ueki, Drs. Fuminori Hyodoh, Akiko Takata-Tomokuni, Yasuhiko Kawakami, Takaaki Aikoh, Shuko Murakami, and Yoshie Miura. We also appreciate the technical assistance of Ms. Haruko Sakaguchi, Naomi Miyahara, Minako Katoh, and Yumika Isozaki. We express special thanks to Drs. Masayasu Kusaka and Kozo Urakami for coordinating the collection of clinical samples. Part of the experimental results in this article was supported by the Special Coordination Fund for Promoting Science and Technology (H18-1-3-3-1, “Comprehensive approach on asbestos-related diseases”), KAKENHI grants (18390186, 19659153, 20390178, and 25460825), Kawasaki Medical School Project grants (20-410I, 23S5, 24S6, 25B65, and 27B06), the Sumitomo Foundation Grant (053027), the Yasuda Memorial Foundation Grant (H18), funding from the Takeda Science Foundation (I-2008) and Young Investigator Activating Grant from the Japanese Society of Hygiene (H18), the Ryobi Teien Memorial Foundation (H24), and the Kawasaki Foundation for Medical Science and Medical Welfare (H24).

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Lee, S. et al. (2017). Silica-Induced Immunotoxicity: Chronic and Aberrant Activation of Immune Cells. In: Otsuki, T., Petrarca, C., Di Gioacchino, M. (eds) Allergy and Immunotoxicology in Occupational Health. Current Topics in Environmental Health and Preventive Medicine. Springer, Singapore. https://doi.org/10.1007/978-981-10-0351-6_2

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