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Query: UMLS:C0032285 (pneumonia)
 54,520 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Electron microscopical, autoradiographical and histochemical investigations were carried out in experimental lipid pneumonia, 6 weeks after exposure to mineral oil. In the lungs developed granulomatous changes with fibroblasts, some macrophages and leucocytes. With the aid of electron microscopy an increased number of fibroblasts with predominantly extracellular localized collagen fibers were visible in the granulomatous foci. Autoradiograms with 3H-Thymidine show an six-fold increase of number of radioactive labelled nuclei of fibroblasts in the granulomatous areas. This two methods--electron microscopy and autoradiography--appear sufficient for early detection of changes in experimental lung fibrosis.
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PMID:[Ultrastructural and autoradiographical investigations of early changes in experimental lung fibrosis (author's transl)]. 43 27

Electron microscopic studies of lung were made and compared in 17 patients with lung disease (10 with idiopathic pulmonary fibrosis, 3 with collagen--vascular diseases, 3 with sarcoidosis, and 1 with chronic eosinophilic pneumonia) and in 5 control patients. In control patients, the alveolar epithelial cells were normal, and no hemidesmosomes were present between the plasma membranes and the basal laminae. In comparison, cuboidal alveolar epithelial cells were present in 15 of the patients with fibrotic lung disease; in 9 of these the alveolar epithelial cells were multilayered. In 7 of the latter 9 patients (5 with idiopathic pulmonary fibrosis and 2 with collagen-vascular diseases), the basal laminae of the alveolar epithelial cells were attached to the plasma membranes by hemidesmosomes and to the underlying interstitial connective tissue by "anchoring fibrils." These fibrils measured from 4000 to 6000 A in length and from 200 to 600 A in width. One or both ends of the anchoring fibrils inserted into thebasal lamina, often forming arcs through which collagen fibrils and connective tissue microfibrils penetrated. Anchoring fibrils showed a complex pattern of transverse banding, which differed from that of collagen and appeared to be symmetric about the center of the fibril. These anchoring fibrils, which resemble those in normal skin and other tissues, were not found in lungs of control patients. In addition, there was a significant correlation between the severity of the pulmonary fibrosis and the presence of anchoring fibrils. These observations suggest that in severe fibrotic lung disease, anchoring fibrils reinforce the attachment of the basal lamina of multilayered alveolar epithelial cells to interstitial connective tissue.
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PMID:Anchoring fibrils. A new connective tissue structure in fibrotic lung disease. 67 68

Destruction of intra-alveolar stroma in regions of tuberculous pneumonia is described. This destruction is associated with phagocytosis of argentophilic granules and fibre fragments by macrophages. The specific features of stromal destruction consist of sequestration, fragmentation, lysis, and other, less obvious, changes in reticulin and collagen fibres found in the air spaces. These findings have important implications in chronic fibrosing pneumonitis where similar intra-alveolar stromal changes occur. Destructive stromal changes have also been noted within granulomatous nodules of sarcoidosis in the region of giant cells. Some of the latter also contain argentophilic fibre fragments.
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PMID:The morphology of alveolar tissue destruction. 70 88

Radioimmunoassay of 5alpha, 7alpha-dihydroxy-11-keto-tetra-norprosta-1,16-dioic acid, main urinary metabolite of prostaglandin F2alpha (PGF2alpha-MUM), was performed in patients with various respiratory diseases including diffuse interstitial fibrosing pneumonitis (DIFP, fibrosing alveolitis). Twenty-four hr excretion of PGF2alpha-MUM in patients with primary lung cancer, pulmonary fibrosis secondary to collagen diseases and stationary DIFP was normal. On the other hand, 24 hr excretion of PGF2alpha-MUM in patients with carcinomatous pleuritis was high and that in patients with aggravating DIFP was markedly high. There was no correlation between serum LDH levels and 24 hr excretion of PGF2alpha-MUM.
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PMID:Radioimmunoassay of main urinary metabolite of prostaglandin F2alpha in patients with diffuse interstitial fibrosing pneumonitis (DIFP) and other respiratory diseases. 76 Feb 64

Sclerosing mediastinitis is excessive production of fibrous tissue in the mediastinum. Its most common manifestations, widening of the mediastinum and superior vena caval obstruction, are the only roentgenographic findings generally recognized to be associated with this disease. Analysis of 29 cases of sclerosing mediastinitis and review of the literature reveal that compression of mediastinal organs by constricting bands of collagen may cause various roentgen manifestations including bronchial or tracheal obstruction leading to atelectasis or obstructive pneumonitis, pulmonary venous obstruction, pulmonary artery obstruction, esophageal obstruction and nerve entrapment. The most common abnormality seen on the chest roentgenogram, mediastinal widening, is usually superior and especially right paratracheal in location. Superior vena caval compression is smooth and tapered rather than irregular as in malignant disease. Pulmonary venous and arterial obstruction may cause cor pulmonale and death, although the other manifestations are usually not life-threatening. The most common causes of sclerosing mediastinitis are generally considered to be granulomatous diseases, especially histoplasmosis, although many other causes have also been suggested. The disease may be regarded as an inappropriate response to one of several stimuli.
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PMID:The multiple roentgen manifestations of sclerosing mediastinitis. 76 13

Measurements of urinary hydroxylysine glycosides indicate that considerable collagen degradation occurred during the reentry into the earth's atmosphere of the American astronauts of the Apollo-Soyuz mission. Since the crew accidentally inhaled nitrogen dioxide, a recognized pulmonary irritant, and showed clinical and roentgenographic signs of diffuse chemical pneumonitis, it is likely that collagen degradation occurred in the pulmonary parenchyma.
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PMID:Collagen breakdown and nitrogen dioxide inhalation. 83 84

Pentamidine isethionate is a trypanocidal drug used for the treatment of Pneumocystis carinii pneumonitis. Hematological complications have occasionally been reported and include anemia, leukopenia, and thrombocytopenia. We report here several qualitative abnormalities of in vitro platelet function and coagulation that have not been described previously. Platelets were exposed in vitro to concentrations of pentamidine isethionate ranging from 0.5 to 100 mug/ml of platelet-rich plasma. Clot retraction, platelet adhesiveness to glass beads, and platelet aggregation (adenosine 5'-diphosphate [ADP], thrombin, epinephrine, collagen, and ristocetin) were inhibited in a dose-dependent fashion. The addition of pentamidine isethionate after aggregation had been initiated with ADP reversed both primary and, to a lesser degree, secondary aggregation. Platelet factor 3 availability and serotonin uptake and release (using collagen as the releasing agent) were not inhibited. Serotonin release with 10(-4) M ADP was slightly inhibited. Pentamidine isethionate prolonged the thrombin time of plasma at concentrations of 5 mug/ml and greater. The prothrombin time was prolonged at concentrations greater than 10 mug/ml of plasma. The inhibition of aggregation was reversed by washing and resuspension in plasma or by the addition of calcium or magnesium ions.
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PMID:In vitro inhibition of platelet function and coagulation by pentamidine isethionate. 92 Dec 38

IH764-3, an effective component isolated from Salvae milliorrhize (a component of traditional Chinese medicine) was used against pulmonary fibrosis in this study. The results indicated that in the treated group, lung coefficient, surfactant, hydroxyproline content and FGF activity were significantly lower than those in the model group. Electron microscopic observation confirmed that the pulmonary ultrastructure was improved remarkably in the treated group: the proliferation of collagen-forming cells and infiltration of inflammatory cells, collagen and elastic fibers were obviously less. All the results demonstrated that IH764-3 has prophylactic and therapeutic effects on the development of pneumonitis and pulmonary fibrosis.
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PMID:[Experimental study of the effect of IH764-3, a potent component isolated from salviae milltiorrhize, against pulmonary fibrosis]. 128 93

An autopsy case of dermatomyositis (DM) associated with interstitial pneumonia probably due to cytomegalovirus infection is reported. After corticosteroid therapy for 1 month, a 79-year-old man with DM developed acute respiratory failure due to interstitial pneumonia and died in spite of intensive respiratory care. By polymerase chain reaction method (PCR), DNA of cytomegalovirus (CMV) was detected in the bronchoalveolar lavage fluid (BALF). CMV was also detected by the method of conventional virus culture from BALF. These findings suggested that initial infection or reactivation of CMV had occurred in the lungs. The autopsy specimen revealed the findings of interstitial pneumonia compatible with CMV pneumonitis, but without the presence of intranuclear inclusion bodies. Although the present case of interstitial pneumonia should not strictly be diagnosed as definite CMV pneumonitis without the presence of intranuclear inclusion bodies in the lung tissue, initial infection or reactivation of CMV in the lungs may have contributed to the pathogenesis of interstitial pneumonia. In other cases of collagen vascular disease associated with interstitial pneumonia, CMV or other viruses may contribute to the pathogenesis of interstitial pneumonia.
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PMID:[An autopsy case of dermatomyositis associated with interstitial pneumonia probably due to cytomegalovirus infection]. 133 61

We present a case of endobronchial fibroma in a 59-year-old man admitted for repeated pneumonia, successfully treated by endoscopic Nd-YAG laser. His chest X-ray showed an infiltrative shadow in the right lower lung field and a mass shadow within the truncus intermedius. Bronchoscopy revealed a polypoid mass with lobulated whitish surface, obstructing 90% of the lumen. A biopsy taken from the tumor was suggestive of fibroma histologically. Two previous case reports stated that endobronchial fibroma readily detaches from the bronchial wall during removal. The tumor was successfully removed without dropping any tumor fragment to obstruct the distal bronchus by means of biopsy forceps manually attached to an endoscope with endoscopic Nd-YAG laser. The resected tumor was mainly composed of collagen fibers with scanty spindle-shaped fibroblastic cells, which was considered consistent with endobronchial fibroma. Endobronchial fibroma is a rare benign lung tumor, and only seven cases have been reported in the Japanese literature. There was no recurrence at three years and nine months.
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PMID:[A case of endobronchial fibroma associated with recurrent pneumonia]. 140 87


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