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Immunohistochemical detection of Pneumocystis carinii in transbronchial lung biopsy specimens: antigen difference between human and rat Pneumocystis carinii

, : Immunohistochemical detection of Pneumocystis carinii in transbronchial lung biopsy specimens: antigen difference between human and rat Pneumocystis carinii. Japanese Journal of Clinical Oncology 22(6): 387-392

Transbronchial lung biopsy specimens, from three patients with non-AIDS-related Pneumocystis carinii pneumonia (PCP) and rat lung tissue in which PCP was induced by the administration of dexamethasone, were studied to determine the diagnostic usefulness of an immunohistochemical method using commercially available anti-Pneumocystis monoclonal antibody, 3F6, on formalin-fixed, paraffin-embedded tissue. PC was consistently stained a bright red color and unambiguously identified in all three human lung specimens, but not stained in lung tissues at autopsy from patients with various fungal pneumonias. In contrast, PC was weakly stained in PCP-induced rat lungs. The present study indicates human PC and rat PC to be antigenically different in terms of the existence of the 82 kilo-dalton (kD) antigen against which 3F6 is directed.


PMID: 1283992

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