Yasuhiko Koga1, Takahiro Satoh2, Kyoichi Kaira3, Masashi Koka2, Takeshi Hisada4, Junko Hirato5, Bolag Altan3, Masakiyo Yatomi4, Akihiro Ono4, Yosuke Kamide4,6, Yasuo Shimizu7, Haruka Aoki-Saito4, Hiroaki Tsurumaki4, Kimihiro Shimizu8, Akira Mogi9, Tamotsu Ishizuka10, Masanobu Yamada4, Kunio Dobashi11. 1. Department of Medicine and Molecular Science, Gunma University Graduate School of Medicine, 3-39-15 sho-wa machi, Maebashi, Gunma, 371-8511, Japan. ykoga@gunma-u.ac.jp. 2. Takasaki Advanced Radiation Research Institute, Japan Atomic Energy Agency, 1233 Watanuki-machi, Takasaki, Gunma, 370-1292, Japan. 3. Department of Oncology Clinical Development, Gunma University Graduate School of Medicine, 3-39-15 sho-wa machi, Maebashi, Gunma, 371-8511, Japan. 4. Department of Medicine and Molecular Science, Gunma University Graduate School of Medicine, 3-39-15 sho-wa machi, Maebashi, Gunma, 371-8511, Japan. 5. Department of Pathology, Gunma University Hospital, 3-39-22 sho-wa machi, Maebashi, Gunma, 371-8511, Japan. 6. Department of Allergy, Sagamihara National Hospital, 18-1 Sakuradai minami-ku, Sagamihara, Kanagawa, 252-0392, Japan. 7. Department of Pulmonary Medicine and Clinical Immunology, Dokkyo Medical University School of Medicine, 880 Kitakobayashi, Mibu-machi, Tochigi, 321-0293, Japan. 8. Department of Thoracic Visceral Organ Surgery, Gunma University Graduate School of Medicine, 3-39-15 sho-wa machi, Maebashi, Gunma, 371-8511, Japan. 9. Department of General Surgical Science, Gunma University Graduate School of Medicine, 3-39-15 sho-wa machi, Maebashi, Gunma, 371-8511, Japan. 10. Third Department of Internal Medicine, Faculty of Medical Sciences, University of Fukui, 23-3 Matsuoka-Shimoaizuki, Eiheiji-cho, Yoshida-gun, Fukui, 910-1193, Japan. 11. Gunma University Graduate School of Health Sciences, 3-39-22 sho-wa machi, Maebashi, Gunma, 371-8514, Japan. dobashik@gunma-u.ac.jp.
Abstract
OBJECTIVES: Studies have shown that inhaled mine dust, such as asbestos, can be translocated to various organs including the lymph nodes. Recently, we have established a protocol that enables us to identify inhaled elements using paraffin embedded lung specimens by in-air microparticle-induced X-ray emission (micro-PIXE). However, little research has examined the concentration of these inhaled fibers in various organs or the mechanisms of their translocation. In this study, we compared the concentration of inhaled fibers in the lung parenchyma to the concentration in the hilar lymph node as well as to determine the elemental spatial distribution of the inhaled fibers in a patient with occupational asbestos exposure. METHODS: Lung tissues and hilar lymph node in a patient with asbestos exposure were used in this study. Elemental analysis was performed by in-air micro-PIXE. Immunohistochemical analysis was performed using anti CD163, smooth muscle actin, vimentin and β-catenin antibody. RESULTS: The analysis revealed that the amount of inhaled silicon was approximately 6 times higher in the lymph node than in the lungs. The spatial analysis showed that silicon, iron and aluminium were co-localized in the hilar lymph node. The immunohistochemical analysis showed localized agreement of the inhaled fibers with macrophages, smooth muscle actin, and vimentin in the hilar lymph node. CONCLUSIONS: This study showed that in-air micro-PIXE could be useful for analyzing the elemental distribution and quantification of inhaled fibers in the human body. Furthermore, immunohistochemistry in combination with in-air micro-PIXE analyses may help to determine the mechanism of mine dust distribution in vivo.
OBJECTIVES: Studies have shown that inhaled mine dust, such as asbestos, can be translocated to various organs including the lymph nodes. Recently, we have established a protocol that enables us to identify inhaled elements using paraffin embedded lung specimens by in-air microparticle-induced X-ray emission (micro-PIXE). However, little research has examined the concentration of these inhaled fibers in various organs or the mechanisms of their translocation. In this study, we compared the concentration of inhaled fibers in the lung parenchyma to the concentration in the hilar lymph node as well as to determine the elemental spatial distribution of the inhaled fibers in a patient with occupational asbestos exposure. METHODS: Lung tissues and hilar lymph node in a patient with asbestos exposure were used in this study. Elemental analysis was performed by in-air micro-PIXE. Immunohistochemical analysis was performed using anti CD163, smooth muscle actin, vimentin and β-catenin antibody. RESULTS: The analysis revealed that the amount of inhaled silicon was approximately 6 times higher in the lymph node than in the lungs. The spatial analysis showed that silicon, iron and aluminium were co-localized in the hilar lymph node. The immunohistochemical analysis showed localized agreement of the inhaled fibers with macrophages, smooth muscle actin, and vimentin in the hilar lymph node. CONCLUSIONS: This study showed that in-air micro-PIXE could be useful for analyzing the elemental distribution and quantification of inhaled fibers in the human body. Furthermore, immunohistochemistry in combination with in-air micro-PIXE analyses may help to determine the mechanism of mine dust distribution in vivo.
Authors: Jean M Cox-Ganser; Cecil M Burchfiel; Desta Fekedulegn; Michael E Andrew; Barbara S Ducatman Journal: J Occup Environ Med Date: 2009-02 Impact factor: 2.162