No abstract available.
Animals ; Rats* ; Sciatic Nerve*

The primary culture of human nasal epithelial cells was performed using the inferior nasal turbinate tissues, and infected with Hantaan virus to examine the hypothesis of airborne transmission of Hantaan virus in humans. The primary culture cells were identified as epithelial cells by morphologic and immunologic analyses. The viral antigens were detected in the primary human nasal epithelial cells infected with Hantaan virus by immunofluorescence staining. The ICAM-1 induction by Hantaan virus or IFN-gammawas examined in the primary human nasal epithelial cells and human lung fibroblasts (WI-38). Hantaan virus induced the surface ICAM-1 in Wl-38 cells in a time-dependent manner, and IFN-gammainduced the surface ICAM-1 in a dose-dependent manner in HNEC and WI-38 cells. These results revealed that the human nasal epithelial cells are susceptible to Hantaan viral infection supporting the hypothesis of airborne transmission of Hantaan virus in humans. The human lung fibroblasts also might have an important role in the pathogenesis of Hantaan virus through the induction of ICAM-1.
Antigens, Viral ; Epithelial Cells* ; Fibroblasts* ; Fluorescent Antibody Technique ; Hantaan virus* ; Humans* ; Intercellular Adhesion Molecule-1* ; Lung* ; Turbinates

No abstract available.
Humans ; Siblings*

E-cadherin is a calcium-dependent epithelial adhesion molecule which plays a role in the initial step of invasion of cancer cells. The step that follows the migration of separated tumor cells is a proteolytic lysis of basement membrane and extracellular matrix by protease of epithelial and endothelial cells such as matrix metalloproteinase (MMP). Vascular endothelial growth factor (VEGF) is known to be an endothelial cell-specific powerful mitogen as well as a vascular permeability factor. This study is aimed to evaluate the correlation between expression of these factors and pathologic or clinical variables and the roles and prognostic significance of those factors in squmous cell carcinoma and adenocarcinoma of the lung. Immunohistochemical stains were performed for E-cadherin, MMP-2, and VEGF in surgically resected specimens from 90 patients with squmous cell carcinoma and adenocarcinoma of the lung. Mean age of the patients was 59.7 years. Histologic type was categorized into 56 cases of squamous cell carcinoma and 34 cases of adenocarcinoma. Mean survival period of the 35 patients was 54 months. The immunohistochemical stains for E-cadherin, MMP-2, and VEGF revealed positive reaction in 67 cases (74.4%), 43 cases (47.8%), and 34 cases (37.8%), respectively. The expression of E-cadherin was higher in adenocarcinoma (82.4%) than in squamous cell carcinoma (69.6%). MMP-2 was expressed in the tumor cells, especially those invading into the surrounding stroma. The expression of MMP-2 was significantly correlated with the survival rate (p<0.05). The expression of VEGF in the tumor cells was significantly higher in cases with lymph node metastasis (p<0.05). In conclusion, these findings suggest that the expression of MMP-2 and VEGF predict poor prognosis of patients with squmous cell carcinoma and adenocarcinoma of the lung and that VEGF may play a role in tumor metastasis.
Adenocarcinoma* ; Basement Membrane ; Cadherins* ; Carcinoma, Squamous Cell* ; Coloring Agents ; Endothelial Cells ; Extracellular Matrix ; Humans ; Lung* ; Lymph Nodes ; Neoplasm Metastasis ; Prognosis ; Survival Rate ; Vascular Endothelial Growth Factor A*

No abstract available.
Pyloric Stenosis, Hypertrophic*

There are substantial evidence suggesting that DNA content of tumors may provide the prognostic information with independent significances. With the advent of computer and video technology, image analysis becomes a practical method of measuring DNA that also makes it possible to classify cells. Among the patients who were operated and diagnosed as bone tumor at Department of Orthopedic Surgery, Korea University Hospital, from March 1992 to March 1995, we evaluated 19 cases by image cytometry and studied them. Among 19 case, 4 cases were fibrous dysplasia, 2 cases chondroma, 3 cases osteosarcoma, 2 cases chondrosarcoma, and 8 cases were metastatic bone tumors. Total benign tumors were 6 cases and malignant tumors were 13 cases. All benign tumors were diploid and all malignant tumors but one metastatic tumor were aneuploid. As a result, DNA quantitation by image analysis is effective in the differential diagnosis of malignancy in bone tumor. It seems that DNA quantitation will be used on the evaluation of tumor staging and prognosis by further clinical study.
Aneuploidy ; Chondroma ; Chondrosarcoma ; Clinical Study ; Diagnosis, Differential ; Diploidy ; DNA ; Humans ; Image Cytometry ; Korea ; Methods ; Neoplasm Staging ; Orthopedics ; Osteosarcoma ; Prognosis

Many studies for LPS-induced cytokines, chemokines gene expressions have been reported, but results are highly diverse. The dose of LPS used, cell type studied or other technical factors may contribute to the differences. We investigated the cytokine mRNA expressions, interleukin-2 (IL-2), IL-6, IL-10 and IFNr, on thioglycollate (TG) elicited-mouse peritoneal macrophages stimulated with various concentrations, 1 ng/ml, 10 ng/ml, 100 ng/ml, 1 ug/ml and 10 ug/ml, of LPS used by reverse transcription polymerase chain reaction (RT-PCR) and northern blot analysis. TG- elicited peritoneal macrophages expressed IL-6 and IFN-r mRNA in a dose-dependent manner. The expressions of IL-2 and IL-10 mRNA were dose-independent manner. In northern blot analysis, IL-6 mRNA expression was detected only in 10 ug/ml LPS concentration for short stimulation time (0.5 h), while IL-10 mRNAs were expressed evenly in all LPS concentrations. The expression of IL-6 mRNA was sustained until 72 h at 10 ug/ml concentration only, but IL- 10 mRNAs of all cases of LPS concentrations were sustained evenly until then. These results suggest that the concentration of LPS required for cytokine induction must be determined differently from gene to gene types, and although LPS concentration 10 ug/ml has not been used as an ordinary concentration in vitro cytokine study, 10 ug/ml of LPS might be more appropriate concentration in the study of IL-6 expression on mouse peritoneal macrophages.
Animals ; Blotting, Northern ; Chemokines ; Cytokines ; Gene Expression ; Interleukin-10 ; Interleukin-2 ; Interleukin-6 ; Macrophages, Peritoneal* ; Mice* ; Polymerase Chain Reaction ; Reverse Transcription ; RNA, Messenger*

Intexcellular adhesion molecule-10CAM- 1) is an important moleade in aehating immune and inflammatory responses. It is found on the surface of hematopoietic and nonhematopoietic cells. It can act as an adhesive ligand for integrins such as LFA-1 (CD1&/CD11a) and MAC-1 (CD18/ CD11b). ICAM-1 is basally expressed in sigaificant amount on a limited number of cell types, including monocytes and endothelial ceRs. But it is inducible or upregulated by INF-r, IL-1p and TNF-a on many cell types. IL-4, a pleiotropic cytokine and mast cell differentiation factor, is upregulated in human allergic disease and stimulates expression of vascular adhesion molecule-1 (VCAM-1) in endothelial cells. IL-4 also promotes expression of surhce ICAM-1 in human mast cells and dermal fidroblasts. So in allergic rhinitis and asthma, IL-4 may be an important cytokine implicated in the pathogenesis of inflammation. We studied the effect of INF-r and IL-4 on expression of ICAM-1 in human nasal epithelial cells (HNEC). HNEC were prepared by primary culture method of monolayer culture of dissociated cells hom human inferior nasal turbinate mucosa. Nasal mucosa were obtained by partial turbinectomy of septal deviation patients. Primary cultured cells were charaterized as an epithelial cell type by indirect immuno-fluorescence assay using antilmdies against cytokeratin-pan, cytokeratin No. 8, vimentin and von Willebrand factor. Using fluorescence activated cell sorter (Coulter EI1TE), we analyzed the quantitative expression of ICAM-1 on HNEC. Treatment of HNEC with IFN-r (1ng/ml) for 24 hours caused about 8 fold increase of the surface ICAM-1 compared with constitutive expression by mean fluorescence intensity (MIF) but IL-4 had little effect. Theses foundings suggest that IFN-r is a potent ICAM-1 inducer in HNEC and further studies are necessary for the role of IL-4 on HNEC.
Adhesives ; Asthma ; Cells, Cultured ; Cytokines* ; Endothelial Cells ; Epithelial Cells* ; Fluorescence ; Humans ; Inflammation ; Integrins ; Intercellular Adhesion Molecule-1 ; Interleukin-4 ; Keratins ; Lymphocyte Function-Associated Antigen-1 ; Mast Cells ; Monocytes ; Mucous Membrane ; Nasal Mucosa ; Rhinitis ; Turbinates ; Vimentin ; von Willebrand Factor

Creativity has historically been investigated in psychological and educational aspects, and developed by psychologists and educationists. Recent progress of computational and cognitive science has opened new horizons in the neuro-scientific approach, bridging the concept of creativity and specialized brain function. This review discusses the psychological and educational theories of creativity, and focuses on the recent works in neuroscience dealing with creativity in view of divergent thinking. We also summarize the brain areas and their networks found by the neuroimaging studies, especially functional magnetic resonance imaging.
Brain ; Cognitive Science ; Creativity* ; Magnetic Resonance Imaging ; Neuroimaging ; Neurosciences ; Psychology ; Thinking

No abstract available.
Extracorporeal Circulation* ; Heart* ; Potassium* ; Thoracic Surgery*