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Intranuclear fibrillary inclusions in influenza pneumonia
Abstract:
Electron microscopical study of the lung tissue from a 75-year-old man who died of influenza pneumonia (A/Victoria/RI/76) demonstrated fibrillary inclusions in the nuclei of many alveolar lining cells, in bronchial epithelial cells, and also in endothelial cells. These inclusions were morphologically different from those previously reported in experimental animals. In view of previous experimental studies indicating the necessity of nuclear participation in the replication of influenza virus, these inclusions may be virus-induced structures. Also, possibly the presence of these inclusions in the nuclei of many endothelial cells might be indicative of endothelial damage of microvessels and may be a pathogenetically important factor in influenza pneumonia.
Insights
Electron microscopy revealed novel fibrillary inclusions in lung cells of a patient with influenza pneumonia. These virus-induced structures in endothelial cells may contribute to disease severity.
Area of Science:
- * Pathology
- * Virology
- * Cell Biology
Background:
- * Influenza pneumonia is a severe respiratory illness caused by influenza viruses.
- * Viral replication, particularly influenza virus, often involves nuclear participation.
- * Understanding virus-host interactions at the cellular level is crucial for disease pathogenesis.
Observation:
- * Electron microscopy of lung tissue from a fatal influenza pneumonia case (A/Victoria/RI/76) was performed.
- * Fibrillary inclusions were observed within the nuclei of alveolar lining cells, bronchial epithelial cells, and endothelial cells.
- * These inclusions exhibited distinct morphology compared to those seen in experimental animal models.
Findings:
- * Novel fibrillary inclusions were identified in multiple lung cell types, including endothelial cells.
- * The observed inclusions differed morphologically from previously documented structures in animal studies.
- * These inclusions are potentially virus-induced, given the known nuclear role in influenza virus replication.
Implications:
- * The presence of these nuclear inclusions may indicate virus-induced cellular changes.
- * Endothelial cell nuclear inclusions suggest potential microvascular damage in influenza pneumonia.
- * These findings could highlight a novel pathogenic mechanism contributing to severe influenza pneumonia.