Recently attention has been focused on the biology of transforming growth factor-beta1 (TGF-beta1). TGF-beta1, a potent regulator of cell proliferation, stimulates the proliferation of many cell types of mesenchymal origin and inhibits the growth of many epithelial cells. But its cellular distribution and temporal expression remain unknown. The aim of this study was to investigate immunohistochemically the cellular distribution and temporal expression of TGF-beta1 during rat hepatic fibrosis induced by dimethylnitrosamine (DMN). At an early stage of liver fibrosis, there was evidence of multiple centrilobular hemorrhagic necrosis with parenchymal lobular collapse, and at a late stage, there was septal fibrosis with micronodule formation of the parenchyme. TGF-beta1 peptide was first expressed in centrilobular clusters of macrophage which were surrounded by many TGF-beta1 negative fat-storing cells (FSCs). Along with the progression of fibrosis, the TGF-beta1 peptide was expressed in the alpha-smooth muscle actin positive FSCs and also in some peripherally located hepatocytes of micronodules. Serum IFN-gamma was detected in the serum 2 weeks after an initial administration of DMN had reached the peak level at the 4th week and then markedly decreased at the 5th week. We think that TGF-beta1 peptide is produced by macrophages influenced by soluble IFN-gamma, and is expressed in the -smooth muscle actin positive mesenchymal cells and regenerating hepatocytes, and that this cytokine may have an important role in the synthesis of the extracellular matrix and in the regulation of hepatocytic regeneration.
Actins ; Animals ; Biology ; Cell Proliferation ; Dimethylnitrosamine* ; Epithelial Cells ; Extracellular Matrix ; Fibrosis* ; Hepatocytes ; Liver Cirrhosis ; Liver* ; Macrophages ; Necrosis ; Rats* ; Regeneration ; Transforming Growth Factor beta1*

No abstract available.
Amitriptyline* ; Humans

The author examined the immunophenotype and expression of Epstem-Barr virus RNA (EBERs) used in the situ hybridization technique in 20 cases of conventional malignant lymphoma and 28 cases of polymorphic reticulosis and malignant lymphoma with features of polymorphic reticulosis occured in the upper aerodigestive tract including the upper digestive tract(palatine tonsil), and upper respiratory tract(nasal cavity, paranasal sinus, nasopharynx). The results obtained were summarized as followings; 1. The favorable site of malignant lymphoma that occured in the upper aerodigestive tract was in the palatine tonsil(11 out of 20 cases, 55%), those of polymorphic reticulosis and malignant lymphoma with features of polymorphic reticulosis were nasal cavity and nasopharynx(19 out of 28 cases, 78%). 2. The immunophentype of malignant lymphoma that occured in the upper aerodigestive tract was mostly B-cell phenotype (15 out of 20 cases, 75%), and that of polymorphic reticulosis and malignant lymphoma with features of polymorphic reticulosis was predominantly T-cell phenotype(22 out of 28 cases, 79%). 3. The EBERs positivity of malignant lymphoma that occured in the upper aerodigestive tract was 25%(5 out of 20 cases), but that of polymorphic reticulosis and malignant lymphoma with features of polymorphic reticulosis was 57%(16 out of 28 cases). 4. The positive cases for EBERs revealed angiocentricity with necrosis(16 out of 21 cases, 76%), predominantly T-cell phenotype(19 out of 21 cases, 90%), and favorably involved the nasal cavity and nasopharynx(16 out of 21 cases, 76%). Based on the above results, it was concluded that polymorphic reticulosis and malignant lymphoma with features of polymorphic reticulosis that occurred in the upper respiratory tract was an EBV-positive angiocentric T-cell lymphoma favorably involving the nasal cavity and nasopharynx.

No abstract available.
Adrenocortical Adenoma* ; Lipomatosis* ; Paraplegia*

Chordoid meningioma is a recently established meningeal tumor and is characterized by a chordoma like histologic appearance, peritumoral lymphoplasma cell infiltrates causing systemic manifestations similar to Castleman syndrome and having a good prognosis. We experienced a case of chordoid meningioma in a 25 year-old woman. The patient preoperatively manifested iron-resistant hypochromic microcytic anemia, polyclonal gammopathy with beta-gamma bridging and detected a huge mass in the right temporo-parietal convexity of the brain. Microscopically, the mass was composed of nests and cords of cuboid, partly vacuolated cells in a mucoid matrix, simulating chordoma. The tumor was surrounded by masses of lymphoplasma cells around vessels, many of the plasma cells contained Russell bodies. Ultrastructural findings showed intranuclear cytoplasmic invaginations, microvilli protruding from cytoplasmic surfaces and well formed desmosomes. Some portions of tumor cell surface were covered by stretches of basal lamina.
Female ; Humans ; Meningioma

No abstract available.

No abstract available.

No abstract available.

No abstract available.
Child* ; Humans ; Infant*

We report a case of squamous cell carcinoma arising in porokeratosis of Mibelli in a 32-year-old male who presented with a large, slowly extending, erythematous patch with central ulceration on the left lateral side of the neck. Histopathologic examination of the periphery of the patch and central tumor showed porokeratosis and squamous cell carcinoma, respectively.
Adult ; Carcinoma, Squamous Cell* ; Epithelial Cells* ; Humans ; Male ; Neck ; Porokeratosis* ; Ulcer