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Biomedical subjects

S Kozuka

Publications and source records attributed to S Kozuka.

At least 37 records · Page 2Linked to original sources
PubMed1988

Relationship of intrahepatic bile duct hyperplasia to cholangiocellular carcinoma.

To investigate the relationship between intrahepatic bile duct hyperplasia and cholangiocellular carcinoma, 27 patients with cholangiocellular carcinoma (including biliary cystadenocarcinoma) and 303 controls were histologically examined. Livers with cholangiocellular carcinoma were closely associated with hyperplasia (100%), atypical hyperplasia (77.8%), and carcinoma in situ (51.9%). Transition from hyperplasia to atypical hyperplasia, and from atypical hyperplasia to carcinoma, was often observed. In the controls, hyperplasia was frequent in those older than 30 years of age, whereas carcinoma was frequent in patients from 50 to 80 years of age. Of the intrahepatic bile ducts examined, the large duct showed the highest incidence of hyperplasia, atypical hyperplasia, and carcinoma in situ. All 27 cases of cholangiocellular carcinoma originated in, or near, the hilus of the liver. These findings suggest that cholangiocellular carcinoma frequently develops from bile duct hyperplasia.

Adenoma, Bile Duct↗
PubMed1988

Gastrin producing cells in the regenerating mucosa of the small intestine.

The presence of gastrin producing cells in the regenerating mucosa of the small intestine in 9 out of 19 patients with Crohn's disease, nonspecific ulcer or tuberculosis was histochemically examined, employing the method of peroxydase-antiperoxydase complex. Gastrin producing cells were found in 19 out of a total of 23 specimens with pyloric gland metaplasia, whereas they were found to be present in only 1 out of a total of 15 specimens without pyloric gland metaplasia. They were usually seen in the glands adjacent to the metaplastic pyloric glands. No gastrin producing cells were seen in the control specimens. It is suggested that gastric gland metaplasia of the small intestine is a true metaplastic change, into mucosa which has the functional property of the stomach.

Adult↗
PubMed1986

Decreased particulate NADH oxidase activity in Bacillus subtilis spores after polymyxin B treatment.

The activities of several enzymes of polymyxin B-treated dormant and germinated spores of Bacillus subtilis were examined. The particulate NADH oxidase of the antibiotic-treated spores showed considerably lower specific and total activities compared with those of untreated ones. The specific and total NADH oxidase activities of untreated spores increased 12- and 15-fold respectively during germination, whereas increases during germination of polymyxin B-treated spores were inhibited. The specific and total activities of particulate NADH cytochrome c reductase of dormant spores were decreased by polymyxin B treatment in almost the same proportion as those of the particulate NADH oxidase. The specific activity of NADH dehydrogenase of dormant spores remained unchanged after antibiotic treatment but the total activity fell considerably. The activities of other enzymes examined were similar for untreated dormant and germinated spores and antibiotic-treated spores. The respiration of polymyxin B-treated dormant spores was inhibited at the same time as the start of germination. Morphologically, polymyxin B-treated dormant spores lost a laminar structure of the cortex and details of the spore protoplast. The inhibitory mechanism of particulate NADH oxidase activity of polymyxin B-treated dormant spores is discussed.

Alanine Dehydrogenase↗
PubMed1985

Properties and origin of filamentous appendages on spores of Bacillus cereus.

Some physical, chemical, and immunological properties of filamentous appendages and the exosporium on the spores of Bacillus cereus were examined for the purpose of elucidating the origin of filamentous appendages. The main components of both filamentous appendages and the exosporium were protein and their amino acid compositions were similar in point of a high content of glycine, alanine, threonine, valine, and acidic amino acids and a low content of basic and sulphur-containing amino acids. Treatment with 1 N NaOH at 50 C solubilized the isolated appendages completely and the isolated exosporia partially. In both preparations the solubilized proteins consisted of highly acidic monomeric subunits with molecular weights between 2,000 and 5,000. Treatment of the spores with 2% 2-mercaptoethanol at 37 C resulted in the isolation of long filamentous appendages without segmentation. When the spores were treated with 10% 2-mercaptoethanol, there was partial destruction of the exosporium as well as detachment of the filamentous appendages. There was a common antigenic component in the exosporium and the tips of the filamentous appendages. Five strains of B. cereus having a common appendage antigen also had a common exosporium antigen, whereas six other strains had neither a common appendage antigen nor a common exosporium antigen. From these facts it was concluded that the filamentous appendages arose from the exosporium.

Amino Acids↗
PubMed1985

Surgical treatment of skin depigmentation caused by burn injuries.

Thin split-skin autografts of normal color were performed on depigmented skin caused by second- and third-degree burns in 32 patients. Repigmentation appeared in almost all the recipient areas soon after grafting and no depigmentation occurred again in the treated area.

Adolescent↗
PubMed1985

Ultrastructural localization of dipicolinic acid in dormant spores of Bacillus subtilis by immunoelectron microscopy with colloidal gold particles.

The localization of dipicolinic acid in dormant spores of Bacillus subtilis was examined by an immunoelectron microscopy method with colloidal gold-immunoglobulin G complex. The colloidal gold particles were distributed mainly in the core regions of dormant spores and were not observed in those of germinated or autoclaved spores. This result clearly demonstrates that dipicolinic acid is localized in the cores of dormant spores.

Bacillus subtilis↗
PubMed1984

Significance of intestinal metaplasia for the evolution of cancer in the biliary tract.

Of 25 cases of cancer in the intrahepatic bile ducts, 44 cases of cancer in the extrahepatic bile ducts, 30 cases of adenoma in the gallbladder, and 100 cases of infiltrating carcinoma in the gallbladder, several to about 20% of the cases showed Paneth's cell metaplasia and/or enterochromaffin cell metaplasia within the tumor mass or in its surrounding mucosa. These metaplasia were not found in small adenomata of the gallbladder, but they were frequently seen in large adenomata. Goblet cell metaplasia and marked hyperplasia of mucous glands were seen more frequently in the mucosa surrounding cancer than in the mucosa of 500 non-neoplastic gallbladders. Although cancer in the gallbladder occasionally developed on the basis of intestinal metaplasia alone, intestinal metaplasia was not likely to be related to induction of most adenomata, but it was likely to be associated with growth and cancerous change of adenoma.

Adenoma↗
PubMed1984

Evolution of carcinoma in the extrahepatic bile ducts.

The histopathology of 43 cases of carcinoma in the extrahepatic bile ducts was reported. All four cases of noninfiltrating carcinoma were papillary or polypoid in gross shape. Only one of the eight cases of papillary or polypoid cancers penetrated beyond the fibromuscular layer of the bile ducts, while most cases of nodular or flat cancers spread deeper than the fibromuscular layer. Adenomatous residue was found in 9 (21.4%) of the total 43 cases, and was particularly frequent in papillary or polypoid cancers (6 [75.0%] of 8 cases). It is likely that early cancers were usually polypoid or papillary in gross shape and that most carcinomas arose from a pre-existing adenoma. Carcinoma associated with a choledochal cyst was found in two cases. Multiple carcinomas were seen in one case. Three cases of carcinoma in the extrahepatic bile ducts were associated with carcinoma of the gallbladder.

Adenoma, Bile Duct↗
PubMed1984

Incidence by age and sex of intestinal metaplasia in the gallbladder.

The incidence by age and sex of intestinal metaplasia, focal mucosal hyperplasia, Rokitansky-Aschoff sinuses, and mucosal atrophy was determined histologically for 500 gallbladders from patients who had undergone cholecystectomy. All intestinal metaplastic changes increased steadily with age and were more frequent in female than in male patients younger than 70 years of age. Focal mucosal hyperplasia was often associated with mucous gland hyperplasia in elderly patients, particularly women.

Adult↗
PubMed1984

Heterotopic gastric mucosa in the small intestine.

A case of tumorous heterotopic gastric mucosa which acted as a leading point of jejunal double-barrelled intussusception in a 16-year-old girl is presented. The lesion, 5 x 3 x 2 cm, was polypoid in shape with sharp circumscription. Histologically, the tumor consisted of gastric fundic and pseudopyloric glands. The pertinent literature is also reviewed.

Adolescent↗
PubMed1984

Basal cell epithelioma occurring in an epidermal nevus.

An unusual case is presented of a thirty-year-old woman in whom basal cell epithelioma developed from a preexisting localized epidermal nevus in the scalp. The epidermal nevus was not associated with any abnormal pilosebaceous complexes.

Adult↗
PubMed1983

Triple fixation of Bacillus subtilis dormant spores.

A triple-fixation method with a sequential application of 5% glutaraldehyde, 1% osmium tetroxide, and 2% potassium permanganate gave superior preservation of the ultrastructure of Bacillus subtilis dormant spores with a thick spore coat.

Bacillus subtilis↗
PubMed1983

[Mode of spread of intrahepatic bile duct carcinoma].

To determine the area of surgical resection and the prognosis in patients with intrahepatic bile duct carcinoma, we studied the mode of spread of this cancer, using 27 autopsy and 4 lobectomized cases. In hilar carcinoma, there was lymphatic invasion to the extrahepatic bile duct before invation to the hepatic lobules. Scirrhous cancer spread more distantly toward the peripheral areas of the liver than non-scirrhous cancer. The occurrence of extrahepatic metastasis might involve the following factors; depth of infiltration, extent of venous invasion, intrahepatic metastasis, size of the main tumor, and number of hepatic segments invaded by the cancer.

Adult↗