The Correlation between Tissue Injury and Calcium Oxalate Crystal Production in Rat's Lung with Experimental <I>Aspergillus niger</I> Infection

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  • YOSHIDA Koichiro
    Division of Respiratory Diseases, Department of Medicine, Kawasaki Medical School

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Other Title
  • ラット<I>Aspergillus niger</I>肺感染実験モデルにおける蓚酸カルシウム結晶の産生とその組織傷害に関する検討
  • ラットAspergillus niger肺感染実験モデルにおける蓚酸カルシウム結晶の産生とその組織傷害に関する検討
  • ラット Aspergillus niger ハイ カンセン ジッケン モデル
  • The Correlation between Tissue Injury and Calcium Oxalate Crystal Production in Rat's Lung with Experimental Aspergillus niger Infection

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Abstract

It is well known that calcium oxalate crystals (crystal) arte commonly found in Aspergillus niger (A. niger) infection site. However, there have been no pathological reports of crystal production and tissue injury using an animal model. I experienced a case with pulmonary aspergilloma and infiltration shadow of the lung that I guessed resulted in crystal-induced inflammation. I performed animal experiments to investigate the posibility of crystals to cause tissue injury. Two different types of immunosuppresed rat models; i.e. cortisone acetate (CA) and CA + cyclophosphamide (CPM) induced-immunodeficiency models (CA model, CA + CPM model), were used for the experiments. In both models, rats were infected with A. niger. Then, the lungs were removed and examined histopathologicaly. The crystals were rarely found in both models on the third day after inoculation and it increased as time passed. However, more growth of hyphae and more production of crystals were observed in the CA + CPM model. In the CA model, crystal depositions in the bronchial epithelium and erosion of the bronchial epithelium adjacent to the crystals were observed. Crystal depositions in the bronchial epithelium were also seen in the CA + CPM model. In this lesion, severe erosions of the bronchial epithelium and invasion of A. niger mycelium into the tissue were observed. These findings suggest, the crystals in the bronchial epithelium may expand and destoroy the cells around them. Therefore, I think that the crystals can induce tissue injury. However, in alveolar portions, depositions of crystals were seen mainly in the margin rather than in the central part of mycelial growth, but no findings indicating injury of the alveolar epithelial cells by crystals were seen. Therefore, posibility of crystals to cause tissue injury in the alveolar portion is not yet clear.

Journal

  • Kansenshogaku Zasshi

    Kansenshogaku Zasshi 72 (6), 621-630, 1998

    The Japanese Association for Infectious Diseases

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