Immunohistological observations on pulmonary tissues from dogs infected withDirofilaria immitis |
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Authors: | K. I. Tanaka R. B. Atwell |
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Affiliation: | (1) Department of Companion Animal Medicine and Surgery, University of Queensland, 4072 Brisbane, Queensland, Australia;(2) Present address: Toxicology Research Laboratories, Chugai Pharmaceuticals Co. Ltd., Minowa-machi, Kamiina-gun, 14016, 399-46 Nagano, Japan |
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Abstract: | Pulmonary tissues from non-infected dogs, naturallyDirofilaria immitis-infected dogs and experimentally infected puppies, selectively necropsied after infection, were assessed using peroxidase-antiperoxidase (PAP) staining technology. Sequential sections of pulmonary tissue were PAP stained with anti-freshD. immitis serum, anti-paraffin processedD. immitis serum, anti-dog immunoglobulin (IgG, IgG Fc, IgM) sera and anti-dog complement (C3) serum, and examined for antibody, complement and forD. immitis antigen. The extent of alveolar septal thickening was positively correlated with infection status. Cellular infiltration was most evident surrounding obstructed areas whereD. immitis werein situ. Antigenic material (microfilariae, eggs, fragmented filariae) labelled by PAP was identified in the pulmonary arteries, alveolar capillaries and alveolar septa. Deposits of complement and IgG, presumably associated with immune complex formation, were also observed in some of the infected dogs. Identification of antigen, antibodies and complement associated with alveolar septal pathology suggested that immune mechanisms were active in its development.Abbreviations FW fresh worm - PAP peroxidase-antiperoxidase - PW processed worm |
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Keywords: | Dirofilaria immitis dog immunohistology lung peroxidase-antiperoxidase staining |
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