Both fibronectin and vitronectin bind to Pneumocystis carinii (P. carinii) and mediate the attachment of the organisms to respiratory epithelial cells. Surfactant A and D play a role in the interaction between P. carinii and host cells. In this study we examined the expression of fibronectin, vitronectin, surfactant-A and D in the interaction between P. carinii and alveolar epithelial cells by immunohistochemistry and pre-embedding immunoelectron microscopy. The experimental rat model of P. carinii pneumonia was induced by administration of low protein diet (8%) and drinking water containing dexamethasone (2 mg/liter) for 6 to 8 weeks. The primary antibodies for light and electron microscopic immunohistochemistries were monoclonal antibodies including fibronectin (1:100) and vitronectin (1:100), and polyclonal antibodies including surfactant A (1:50) and D (1:50), respectively. Light microscopic immunohistochemistry for the fibronectin, vitronectin, surfactant-A and D showed strong expressions on the P. carinii and surface linings of type I alveolar epithelial cells. The electron microscopic immunohistochemistry of the fibronectin and vitronectin showed a strong immunoexpression along the surface pellicles and tubular extensions of P. carinii trophozoites, and surface membranes of the type I epithelial cells. The surfactant-A and D proteins showed a strong expression on the pellicles of P. carinii and surface membranes of the type I epithelial cells, but a weak expression on the free-floating surfactant materials. In conclusions, the trophozoites of P. carinii were mostly attached to type I epithelial cells. The fibronectin, vitronectin, surfactant-A and D were strongly expressed, and played an enhancing role in the binding between the P. carinii organisms and the type I alveolar epithelial cells.
Antibodies ; Antibodies, Monoclonal ; Dexamethasone ; Diet, Protein-Restricted ; Drinking Water ; Epithelial Cells* ; Fibronectins* ; Immunohistochemistry ; Membranes ; Microscopy, Immunoelectron ; Models, Animal ; Pneumocystis carinii* ; Pneumocystis* ; Pneumonia ; Pneumonia, Pneumocystis* ; Trophozoites ; Vitronectin*

Lung cancer is one of the most common types of malignancy in western nations with serious health problem, and it has become the leading cause of cancer death of males, second only to stomach cancer, in Korea. A review of the histopathology of 1363 cases (1231 patients) of lung carcinoma, diagnosed at the Keimyung University Medical center from 1987 to 1996, was performed to reclassify the type of carcinomas and to investigate the change in the distribution of histologic types of lung carcinoma according to age, sex and year. Among the 1363 cases, 132 patients underwent a surgical operation after biopsy. The diagnosis of each case was proven by histopathologic analysis of surgical specimens (13.2%) and biopsy materials (86.8%). The histologic types in our study were basically based on modified WHO classification (1982) and on new WHO classification (1999). The classification of small cell carcinoma was based on International Association for the Small Cell Lung Cancer (IASLC, 1988). Of the 1231 patients with lung carcinoma, 1012 were male and 219 were female (male to female ratio was 3.6:1). According to the analysis of age distribution, the most prevalent age group was 60~69 years in both sex as (n=516, 42.0%). Changing trends in sex distribution of lung carcinoma patients showed that the proportion of men had decreased throughout the years, whereas the proportion of women had significantly increased. Histologically, squamous cell carcinoma was the most common (n=624, 50.7%), followed by small cell carcinoma (21.1%), adenocarcinoma (18.1%), large cell undifferentiated carcinoma (2.1%), adenosquamous carcinoma (0.4%), and large cell neuroendocrine carcinoma (0.4%), in order of frequency. In men, squamous cell carcinoma was the most frequent type (55.1%). In women, adenocarcinoma was the most frequent type (39.7%). In both sexes, adenocarcinoma was the most common type in patients under the age of 40 (n=12, 41.4%), while squamous cell carcinoma proved the most frequent type in patients over the age of 40 (n=617, 51.3%). Changing trends of histologic types of lung cancer showed that the incidences of squamous cell carcinoma had significantly decreased throughout the years, whereas those of adenocarcinoma and small cell carcinoma had increased. In conclusion, the results showing increases in the percentage of female patients and in the number of cases of adenocarcinoma were noteworthy, and well correlated with other related reports.
Academic Medical Centers ; Adenocarcinoma ; Age Distribution ; Biopsy ; Carcinoma ; Carcinoma, Adenosquamous ; Carcinoma, Neuroendocrine ; Carcinoma, Small Cell ; Carcinoma, Squamous Cell ; Classification ; Diagnosis ; Female ; Humans ; Incidence ; Korea ; Lung Neoplasms ; Lung* ; Male ; Sex Distribution ; Small Cell Lung Carcinoma ; Stomach Neoplasms

No abstract available.
Child* ; Humans

This study was carried out to investigate the morphological changes in the exocrine and endocrine glands of rat pancreas treated with endotoxin. Thirty-five male Sprague-Dawley rats, maintained on a stock diet, weight 200.0 gm. average. were divided into two experimental groups. Group 1. Control group. Five rats. Intraperitoneal infections of 0.3 ml normal saline only. Group 2. Endotoxin-treated group. Thirty rats. 7.6 mg of endotoxin per kg. of body weight was administered intraperitoneally. Each of 5 experimental animal was sacrificed 30 minutes, 1, 2, 4, 6 and 8 hours after endotoxin treatment, followed by examinations of histochemical, light and electron microscopy of both transmission and scanning modes. The results were as follows: A. Light microscopic findings: A mild interstitial edema and hyperemia were noted 1-hour after endotoxin treatment. Cytoplasmic vacuolization at 2-hour level(2-hours after endotoxin administration), diminished staining quality of both endocrine and exocrine cells at 6-hour level. B. Electron microscopic examination: a. Transmission electron microscopy. The acinar cells of pancreas showed a mildly increased pre-lysosome at 30-minute level. At 1-hour level, appearance of secondary lysosome was noted in addition to the findings of mitochondrial swelling and decreased cristae; disarray and vacuolization of the RER; vacuolar change of Golgi apparatus. At 6-hour level, post-lysosomes. The changes in the endocrine glands were similar to the findings of exocrine glands just described with time lag of 1 to 2 hours. The endothelial cells of capillaries show swelling and pinocytotic vesicle formation, protrusion of the cytoplasmic processes into the capillary lumen and increased heterochromatin at 1-hour level. These findings became more prominent as time lapses. The lumen of the endothelium tends to be narrowed, filled with fibrin and other blood cell components which later terminated with occasional complete occlusion by the formation of thrombi. b. Histochemical study: Primary lysosomes of the control group revealed a strong reaction of the acid phosphatase whereas the endotoxin treated group with less reactivity limited in the peripheral zones of the lysosomes. Secondary lysosomes with partial reactions. However, the pre-lysosomes and post-lysosomes failed to demonstrate any acid phosphatase activity at all. c. Scanning electron microscopy. The endothelial cells of the capillaries, arterioles and venules demonstrated increased microvillous activity, broad bled formation, cytoplasmic protrusion into the luminal spaces and microthrombi formation at 1-hour level. Six-hour level onward there noted a junctional disruption and partial detachment from the subendothelium of the wall. It can be concluded, therefore: When the endotoxin enters the blood stream, it elicits endothelial injury followed by both exudation with resultant edema of the surrounding tissue and concomitant vascular occlusions due to thrombosis. This vascular occlusion, in turn, causes ischemic degenerative change of the cells of exocrine and endocrine glands of the pancreas which are followed by digestions of degradational materials from the injured cells through the lysosomal phagocytic system. Besides the above pathogenetic pathway, one can not rule out the possibility of the direct effects of the endotoxin to the cells of exocrine and endocrine cells of the pancreas also so rendered.
Male ; Humans ; Rats ; Animals

Experimental studies suggest that captopril plays an important preventive role in radiation induced renal injury (RRI). To elucidate the pathogenesis of RRI and effect of captopril, one subgroup was irradiated with a single dose of 9 gray (Gy) total body irradiation and another subgroup with 17 Gy local irradiation in the right kidney. Twenty-four healthy looking Sprague-Dawley rats, weighing 200~250 g, were divided into one control and three experimental group (EG)s for this study. The control group, composed of 2 rats, was maintained on stock diet and drinking tap water. EG was divided into three. EG 1 composed of two subgroups, the first subgroup, 3 rats each, was sacrificed within 12 hours after 9 Gy and 17 Gy single dose irradiation only and the second subgroup, 2 and 1 rats each, was sacrificed 8 weeks after the same doses irradiation. EG 2 composed of subgroups of 2 and 3 rats was given 500 mg/L of captopril in the drinking water after irradiating them with 9 Gy and 17 Gy and sacrificed in the 8th week. EG 3 was subdivided into four subgroups by captopril doses given, 62.5 mg/L, 125 mg/L and 250 mg/L and sacrificed 20 weeks after 9 Gy and 17 Gy irradiation. On light microscopy proximal convoluted tubules showed cytoplasmic vacuolization and focal necrosis in the subcapsular region in EG 1 sacrificed within 12 hours after 9 Gy and 17 Gy irradiation only (sham) and very mild fibrosis in juxtamedullary regions in rats sacrificed 8 weeks after irradiation. In EG 3 these changes were severely increased with additional increased fibrosis in the juxtamedullary region in the group given captopril 62.5 mg/L. On transmission electron microscopy, there were various degenerative changes of organelle. Among the captopril administered EG 2 and EG 3, rats given a high dosage revealed milder degree of damage compared to that of rats given a low dosage, and thickening of basement membrane was remarkable in rats given a low dosage. There was a reduction in tubular damage related to the captopril dosage. According to the above findings, administration of a high dose of captopril might preserve the ultrastructure in RRI and the possible mechanism of captopril was discussed.
Animals ; Basement Membrane ; Captopril ; Cytoplasm ; Diet ; Drinking ; Drinking Water ; Fibrosis ; Kidney ; Microscopy ; Microscopy, Electron, Transmission ; Necrosis ; Organelles ; Rats* ; Rats, Sprague-Dawley ; Water ; Whole-Body Irradiation

No abstract available.
Mucin-1* ; Poroma*

In an attempt ultrastructural study of alcohol-induced gastric mucosal change, we selected sixty Sprague-Dawley rats. The rats were administrated with 4 ml of 10% and 40% ethanol enterically and examined by light and electron microscopy. Light microscopically, the thickness of the mucus layer of both 10% and 40% ethanol groups was decreased. The antral mucosa revealed focal inflammatory infiltrates, disturbed glandular arrangements, and significant decrease of mucosal thichness and proper glands. On scanning electron microscopy, flattened or swollen mucosal epithelium and irregularly distributed gastric pits were seen in both experimental groups, and these changes were more severe in the groups of higher concentration and longer duration. On transmission electron microscopy, mitochondrial abnormalities with myelin-like materials and dilatation of endoplasmic reticulum and cytoplasmic blebs were observed. Also the mucus cells show significantly decreased mucus globules, increased fat vacuoles, and large autophagic vacuoles. These alterations were similar to those produced by ethanol in the liver and small intestine. This study indicates that, prolonged administration of ethanol induced chronic gastritis, especially chronic atrophic gastritis.
Rats ; Animals

Subtalar dislocation of the foot is one in which there is simultaneous dislocation of the talonavicular joint and talocalcaneal joint while the tibiotalar relationship is unchanged. It was described first by Judey and Defourest in 1811. It incidence was 1% to 1.3% of all dislocations and 15% of injuries of the talus. We have experienced one case of a medial subtalar dislocation without fracture. In our case which was followed for 14 months, the head of the talus was palpable on the dorsum of the foot and the heel was displaced medially in relation to the leg. Radiographically, on the lateral view, the head of the talus was shown superior to the navicular and on the A-P view, the normal talonavicular relationship was disturbed with the calcaneus being displaced medially. The closed reduction was carried out successfully.
Calcaneus ; Dislocations ; Foot ; Head ; Heel ; Incidence ; Joints ; Leg ; Subtalar Joint ; Talus

Alveolar macrophages participate in the host defense against P. carinii, but the mechanisms in degradation and clearance of the organism from lung has not been well established. We observed the transmission and scanning electron microscopic features and evaluated the expression of TNF-alpha and Surfactant-D in the interaction of P. carinii with alveolar macrophages. Expression of TNF-alpha and Surfactant-D in the experimentally induced P. carinii pneumonia in rat was examined by immunohistochemistry and immunoelectron microscopy. Electron microscopically, the alveolar macrophages phagocytized trophozoites and cysts of P. carinii micro-organisms. Immunohistochemically TNF-alpha was strongly expressed in the cytoplasms of alveolar macrophages. Postembedding immunogold labeling for Surfactant-D protein was expressed on the pellicles of trophozoites and cysts, P. carinii micro-organisms in the cytoplasms of macrophages, free floating surfactant materials and multilamellar bodies of type II epithelial cells. We conclude that alveolar macrophages interacted with P. carinii micro-organisms respond with increased expression of TNF-alpha. TNF-alpha may bind to P. carinii and exert a direct toxic effect upon the micro-organisms. Surfactant-D protein may augment binding of P. carinii to the alveolar macrophages and enhance the clearance of the micro-organisms.
Animals ; Cytoplasm ; Epithelial Cells ; Immunohistochemistry ; Lung ; Macrophages ; Macrophages, Alveolar* ; Microscopy, Immunoelectron ; Pneumocystis carinii* ; Pneumocystis* ; Pneumonia ; Pneumonia, Pneumocystis* ; Rats ; Trophozoites ; Tumor Necrosis Factor-alpha*

This study was undertaken to investigate the morphologic changes following flushing, preservation and reperfusion procedures in a canine lung allotransplantation model. Donor lungs were flushed with modified Euro-Collins (MEC) solution, low potassium dextran glucose (LPDG) solution or University of Wisconsin (UW) solution, then stored at 10oC for 20 hours. Light microscopic and electron microscopic features of the lungs were examined after flushing, preservation and 2 hours after reperfusion. After flushing light microscopy showed focal mild alveolar collapse and interstitial edema. After preservation the lung tissue showed multiple foci of alveolar collapse, consolidation, and alveolar epithelial cell damage. After reperfusion the lung tissue showed diffuse alveolar collapse, consolidation and many destroyed cellular debris in the alveolar lumina. After flushing electron microscopy showed focal alveolar collapse and mild swelling of type I epithelial cells. After preservation both type I epithelial cells and endothelial cells were swollen and destroyed focally. Some type I epithelial cells were detached from the basal lamina. The endothelial cells showed luminal protrusion of tactile-like structure and vacuoles of the cytoplasm. After reperfusion the lung tissue showed fibrin material in the alveoli, prominent type I epithelial cell swelling with fragmented cytoplasmic debris and marked endothelial cell swelling with vacuoles or tactile-like projections. The alveolar macrophages showed active phagocytosis. After preservation scanning electron microscopic examination of the pulmonary arteries showed multiple patchy areas of swelling or conglomerated lesions in the inner surface of the pulmonary arteries. In conclusion, the ultrastructural changes associated with flushing were mild in severity, the donor lungs were injured during the preservation, and further damage occurred during the reperfusion.
Basement Membrane ; Cytoplasm ; Dextrans ; Edema ; Endothelial Cells ; Epithelial Cells ; Fibrin ; Flushing ; Glucose ; Humans ; Lung Transplantation* ; Lung* ; Macrophages, Alveolar ; Microscopy ; Microscopy, Electron ; Perfusion* ; Phagocytosis ; Phenobarbital ; Potassium ; Pulmonary Artery ; Reperfusion* ; Tissue Donors ; Vacuoles ; Wisconsin