The histogenesis of the myofibroblast continues to be a controversial issue. The most popular view is that the myofibroblast is derived directly from the fibroblast. The important role of myofibroblasts in the synthesis of collagen and in wound contraction was demonstrated initially in granulation tissue in experimental animals. Four settings are recognized in which myofibroblasts are the principal proliferative cells: reparative responses, pseudoneoplastic disorders, stromal response to neoplasia, and true neoplasms, both benign and malignant. To identify of fibroblastic cells with smooth muscle differentiation features in the nonneoplastic and neoplastic lesions, we examined a variety of histological, immunohistochemical and ultrastructural features of 7 cases of granulation tissue, 7 of hypertrophic scar, 10 of chronic persistent hepatitis, 10 of chronic active hepatitis, 7 of liver cirrhosis, 7 of fibromatosis, 42 of cervical intraepithelial neoplasia, 14 of microinvasive carcinoma, 14 of invasive carcinoma, 7 of fibroma, 20 of fibrosarcoma and 72 of malignant fibrous histiocytoma. Antibodies against alpha-smooth muscle actin and desmin were used in a biotin-streptavidin procedures. The results of immunohistochemical and electron microscopical examinations yielded virtually identical findings. The identification of fibroblastic cells with smooth muscle cell differentiation features in the desmoplastic reactions of carcinomas, fibroma, fibrosarcoma and malignant fibrous histiocytoma offers also novel diagnostic and prognostic perspectives, that might help in evaluating preneoplastic lesions and malignant lesions. So degree of proliferative myofibroblasts was helpful diagnostic aid in differentiation of chronic persistent hepatitis, chronic active hepatitis and liver cirrhosis.
Animals

The immunohistochemical results are compared with ultrastructural features of neoplastic epithelial cells and mesenchymal cells to assess whether immunohistochemistry is useful in the differential diagnosis of epithelial tumors and mesenchymal tumors. Squamous cell carcinoma and transitional cell carcinoma exhibited positive reaction for keratin, but adenocarcinoma was weakly positive reaction for keratin. Ultrastructurally, heavy bundles of tonofilaments were more frequently encountered in squamous cell carcinoma. In adenocarcinomas, the intermediate filaments were arranged randomly as nonaggregated, short filaments spread throughout the cytoplasm. Fibroblastic and fibrohistiocytic tumors, schwannomas, and neurofibromas exhibited positive reaction for vimentin and alpha-smooth muscle actin. Vimentin consisted of large aggregates of gently curved filaments that often displace other cytoplasmic constituents was noted. Fibroblastic cells with features of smooth muscle differentiation were found in granulation tissue of healing wounds, hypertrophic scars, fibromatosis, fibroma, neurofibroma and malignant fibrous histiocytoma. Smooth muscle tumors showed abundant bundles of thin filaments with dense bodies, pinocytotic vesicles and dense attachment plaques along the cell membrane. Skeletal muscle tumors showed bundles of disorganized thick and thin filaments, remnants of sarcomeres and Z-bands. From the above result, ultrastructural and immunohistochemical studies on epithelial and mesenchymal tumors were useful in tumor diagnosis sand classification.
Diagnosis, Differential ; Adenocarcinoma

The myoepithelioma is a rare salivary gland tumor composed nearly exclusively of myoepithelial cells. A case occuring on the parotid gland of a 51 year-old female is reported. Light microscopy finding revealed plasmacytoid cells. Ultrastructurally, the most of the neoplastic cells had polygonal outlines and showed eccentric, round to ovoid nuclei with even contours, peripherally distributed heterochromatin and to three small nuceoli. Their cytoplasms were almost completly filled with thin filaments, arranged in parallel strains and exhibiting "dense bodies". The neoplastic cells showed positive immunostaining for S-100 protein and cytokeratin.
Female ; Humans

The myoepithelioma is a rare salivary gland tumor composed nearly exclusively of myoepithelial cells. A case occuring on the parotid gland of a 51 year-old female is reported. Light microscopy finding revealed plasmacytoid cells. Ultrastructurally, the most of the neoplastic cells had polygonal outlines and showed eccentric, round to ovoid nuclei with even contours, peripherally distributed heterochromatin and to three small nuceoli. Their cytoplasms were almost completly filled with thin filaments, arranged in parallel strains and exhibiting "dense bodies". The neoplastic cells showed positive immunostaining for S-100 protein and cytokeratin.
Female ; Humans

Cholelithiasis is defined as the presence of stones within the lumen of the gallbladder or in the extrahepatic biliary tree. Cholecystitis, secondary to gallstones, is a common surgical disorder in Korea. Detailed microscopic descriptions, particularly the ultrastructural changes, of these diseases were not available. The goal of this study was to identify the ultrastructural alterations of gallbladder epithelium in cholecystitis with and without a stone, according to the degree of severity of inflammation, and the nature of the stone. The gallbladders of the control group, and cholecystitis cases without stone and with stone were fixed and examined with routine stain, special stain, immunohistochemical stain and trans-mission electron microscopy. The number and the volume density of the mucin containing secretary granules were not significantly increased in the calculous cholecystitis cases compared with those of the acalculous cholecystitis cases. Major findings were that the calculous cholecystitis cases showed a markedly reduced total lysosome area and volume density of the lysosome compared with those of the acalculous chole-cystitis cases. The differences between the mucin secretary granules and lysosomes, according to the degree of severity of cholecystitis and the natures of gallstones, were statistically not significant.
Humans

This study was designed to evaluate the effects of altered reticuloendothelial function on the formation of nospecific reactive hepatitis in rats. Increased activity of reticuloendothelial system was evoked by methylcellulose treatment (20 mg/100 g). Partial depression of reticuloendothelial system was induced by splenectomy. Experimental nospecific reactive hepatitis was made by Escherichia coli treatment, artificial stomach perforation ileum ligation, respectively. The nonspecific reactive hepatitis thus made evaluated by liver function tests such as AST ALT and alkaline phosphatase. Histological and electron microscopical observation were also done. The results obtained were as follows: 1. Functional and histological changes of nospecific reactive hepatitis deffered with the disign employed. 2. Partial reduction of reticuloendothelial activity by splenectomy didn't influence the serverity of nonspecific reactive hepatitis. 3. Increase of reticuloendothelial activity by methylcellulose treatmetns reduced the severity of nonspecific reactive hepatitis lesion developed by E. coli treatment and stomach perforation, both functionally and morphologically. 4. Changes of nonspecific reactive hepatitis by lieum ligations, however, were aggrevated by increased recticuloendothelial activity. These results showed the divers effect of altered reticuloendothelial function on the degree of nonspecific reactive hepatitis according to the employed experimental designs.

The cholestasis are defined as blockade or secretory distrubance of bile and appearance of bile in hepatocytes, Kupffer cells and biliary passages, usually associated with dilated bile canaliculi. Intra-and extraheptic cholestasis were induced by 17-ethinyl estradiol, or chlorpromazine hydrochloride and by ligation of bile duct to investigate the mechanism of the hepatic injury, ultrastructural changes of liver and alterations of liver function. The results obtained were as follows. 1) Functional and histological changes of intra-and extrahepatic cholestasis differed in various experimental groups. The liver weight is increased in 17-ethinyl estradiol treated group and ligation of bile duct group (5.6+/-0.15, P<0.001, 5.3+/-0.19 gm/100 gm body weight, P<0.001). The common features of intra-and extrahepatic cholestasis were double membrane bounded amorphous vesicular material infiltrations in the cytoplasm of hepatocyte, partial loss of microvilli of bile canaliculi, anf focal thickening of pericanalicular ectoplasm on electron microscopy. 2) Intrahepatic cholestasis induced by 17-ethinyl estradiol show significantly increased serum level of alkaline phosphatase and total bile aicd (134.0+/-16.82 IU/L, 29.5+/-4.68 umol/l). Kupffer cell proliferation and focal cytoplasmic degradation with myelin figures are characteristic features on electron microscopy. Chlorpromazine hydrochloride induced intrahepatic cholestasis show increased serum level of AST, ALT, Cholesterol and bilirubin (156.9+/-11.32, 49.0+/-2.83 IU/L, 59.3+/-6.73 mg/dl, 1.8+/-.043 mg/dl). Inflammatory cell infiltration, chiefly lymphocytes and esoinophils are seen in periportal area. Prominent vesiculation and vacuolations of smooth endoplasmic reticulum are characteristic feature on electron microscopy. 3) Extrahepatic cholestasis induced by ligation of bile duct show increase serum level of AST, ALT, GGT, cholesterol, total bile acid, and bilirubin (290.2+/-50.24, 171.5+/-47.17, 159.3+/-24.54, 33.7+/-1.47 IU/L, 86.6+/-9.18 mg/dl, 246.6+/-27.34 umol/l, 13.9+/-0.83 mg/dl). Light microscopically, morphologic alterations are feathery degeneration of hepatocytes, proliferation of bile ducts, bile infarct and prominent intracytoplasmic lipid droplets. Electron microscopically, electron dense acidophilic body, bile casts and complete loss of microvilli are seen in dilated bile canaliculi. Also noted are hypertrophy of cannalicular ectoplasm. Finely granular materials are infiltrated in degenerative cytoplasm.
Rats ; Animals

Schneiderian papillomas are papillary lesions of the nasal cavity paranasal sinuses that arise from the Schneiderian membrane, a membrane of ectodermal origin embryologically derived from the nasal placodes. This membrane is characterized by transitional type epithelium, similar to bladder urothelium, with admixed microcysts or mucin droplets. It has a tendency to recur after removal and transform into malignancy even though rare. Total 27 cases of Schneiderian papillomas were examined in the Chosun University medical college, which were collected from 1978 to 1986. The results obtained were as follows: 1) There were 19 male and 8 female patients, and mean age at diagnosis was 50.5+/-12.0 (SD) year (27-74 years). 2) Nasal obstruction or perception of nasal mass was the most common presenting symptom; Mean duration of symptoms was 25.8+/-15.0 (SD) month (4-48 months). 3) Numbers of papillomas had predominantly endophytic (inverted, n=17) and predominantly exophytic (fungiofrom n=6) patients, and four had mixed pattern. 4) In 27 patients, recurrences developed in 9, local invasion in one (with an inverted papilloma), and epidermoid carcinoma in one (with an inverted papilloma).
Female ; Male ; Humans

The aims of this study were to assess the role of p53 overexpression in colorectal tumorigenesis and the association with clinicopathological features. The immunohistochemical results were semiquantitatively assessed. Expression of aberrant p53, tumor-suppressor gene product, was studied immunohistochemically using a monoclonal antibody in 11 nonneoplastic polyps, 19 tubular adenomas, 9 villous adenomas, and 48 colorectal carcinomas. Five out of 11 nonneoplastic polyps, 14 out of 19 tubular adenomas and one out of 9 villous adenomas expressed p53 protein. Seven out of 24 colorectal carcinomas without lymph node metastasis and 14 out of 24 colorectal carcinomas with lymph node metastsis expressed p53 protein. The case of more than 75% positivity of p53 in colorectal carcinoma with lymph node metastasis was seven out of 24, but that in lymph node negative group was two out of 24. In the colorectal carcinoma with lymph node metastasis group; metastatic intranodal neoplastic cells were expressed positively for p53 in 10 out of 14 cases and zero out of 10 cases in group of positive and negative expression of primary lesions, respectively. p53 protein expression was not significantly correlated with variable clinicopathologic features such as age, sex, tumor location, tumor size, differentiation and Dukes' stage. It is suggested that p53 protein overexpression could be a early event in pathogenesis of colon cancer but is not involved in progression of villous adenoma to adenocarcinoma. p53 overexpression seems to be involved in metastatic ability of colorectal carcinomas.
Adenoma ; Neoplasm Metastasis ; Cell Transformation, Neoplastic

Mutations in the p53 gene seem to be the most common genetic changes in human malignancies. Mutation or altered p53 expression is a common occurrence in many solid neoplasms, including head and neck carcinomas. Recent studies have also shown p53 alterations in several premalignant conditions of the colon, esophagus, lung, and brain. Preliminary data have suggested that p53 mutations may be involved in tumor progression. This study was performed to determine the incidence of p53 mutations in histologically 27 squamous cell carcinomas, 19 basal cell carcinomas, 18 Schneiderian papillomas, 3 Schneiderian papillomas with malignant transformation, and 15 pleomorphic adenomas of the head and neck region. The degree of p53 gene overexpression was also evaluated according to differentiation, histologic type of tumor, and tumor progression in the head and neck carcinomas. The results were as follows; 1) Eighteen of 27 squamous cell carcinomas, and 4 of 27 dysplasias adjacent to the squamous cell carcinoma of the head and neck expressed p53 protein, but none of the normal control specimens expressed detectable p53 protein. There was no relationship between differentiation of squamous cell carcinoma and p53 protein expression. 2) Twelve of 19 basal cell carcinomas expressed p53 protein; the adenoid type especially overexpressed p53 protein. 3) Nine of 15 pleomorphic adenomas expressed p53 protein especially in the epithelial components. 4) Thirteen of 18 Schneiderian papillomas and all Schneiderian papillomas with malignant transformation expressed p53 protein. The above results indicate that the p53 protein expression is a useful tool for the prediction of tumor progression in the head and neck tumor, but there was no relationship between the differentiation of the tumor and p53 protein expression.
Humans ; Incidence ; Adenoma ; Genes, p53