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Biomedical subjects

T Chihara

Publications and source records attributed to T Chihara.

At least 55 records · Page 3Linked to original sources
PubMed1984

Production of immunoreactive-polypeptide hormones in cervical carcinoma.

The levels of immunoreactive-polypeptide hormones were measured in tissue extracts of eight uterine cervical cancers by specific radioimmunoassays. In one case with argyrophil granules, high levels of somatostatin, pancreatic polypeptide, calcitonin, and vasoactive intestinal polypeptide (VIP) were found, ranging from 160 to 880 ng/g tissue. A second argyrophil cancer contained 310 ng/g tissue of somatostatin, and a third contained 1100 ng/g tissue of adrenocorticotropic hormone (ACTH) and 380 ng/g of beta-melanocyte-stimulating hormone (beta-MSH). In addition, of the five nonargyrophil cancers tested, four contained calcitonin, three had VIP, two had either somatostatin or glucagon, and one contained ACTH and beta-MSH; the measured levels of these hormones ranged from 1.4 to 2.3 ng/g tissue. Gel filtration on a Sephadex G-75 column showed that the immunoreactive-polypeptide hormones in the first case were chromatographically similar to the authentic or prehormones. These results indicate that ectopic production of multiple immunoreactive-polypeptide hormones is common not only in argyrophil cell carcinoma, but also in nonargyrophil cell carcinoma of the cervix.

Adrenocorticotropic Hormone↗
PubMed1984

Mixed mesodermal tumor of the ovary with carcinoembryonic antigen and alkaline phosphatase production. Histochemical, autoradiographic, and electron microscopic studies of heterotransplanted tumors in athymic nude mice.

A mixed mesodermal tumor of the ovary with carcinoembryonic antigen (CEA) and alkaline phosphatase (ALP) production was serially heterotransplanted into nude mice. The original tumor was diagnosed as homologous tumor, with sarcomatous component consisting of nonspecific spindle-shaped cells. These features were basically retained in the transplanted tumors, including CEA and ALP production. But, heterologous, chondrocytic-differentiated foci were found in the tumors at the third and sixth passages. Transitional-type cells from sarcomatous to carcinomatous cells were sometimes found in the transplanted tumors by light and electron microscopy. Ciliated sarcomatous cells, which may also represent the epithelial differentiation of sarcomatous cells, were found in the tumors at first passage. The current results support the combination tumor theory, which means that both the carcinomatous and sarcomatous components are of common stem cell origin.

Alkaline Phosphatase↗
PubMed1984

The prognostic significance of the size of the largest nodes in metastatic carcinoma from the uterine cervix.

Sizes of the largest metastatic nodes were evaluated as a prognostic factor in 152 patients with Stage IB to IIB cervical carcinomas treated by radical hysterectomy and postoperative irradiation. Of the 152 cases, the largest positive nodes were less than 10 mm in 24 (16%), 10-20 mm in 74 (49%), greater than or equal to 20 mm in 37 (24%), and unresectable in 17 (11%). The frequency of patients with one positive node decreased, and those patients with greater than or equal to 4 positive nodes increased along with an increase in the size of the largest nodes (P less than 0.05). Disease-free periods for 58 patients with recurrent cancer were less than 1 year in 26 (45%), 1-2 years in 18 (31%), 2-3 years in 9 (15%), and greater than or equal to 3 years in 5 (9%). There was a significant increase in cases with node sizes of greater than or equal to 20 mm with recurrence within 1 year after surgery over those with less than 20 mm (P less than 0.001). Incidence rates of 3-year recurrence were significantly different between cases with sizes of less than 10 mm and those with greater than or equal to 10 mm (P less than 0.05), as well as between cases with resectable and unresectable positive nodes (P less than 0.001). These results indicate that the size of the largest positive nodes is a good indicator of the number of positive nodes and the patient's prognosis.

Carcinoma↗
PubMed1984

Role of protease--protease-inhibitor complexes in inflammation.

Neutrophils accumulate and release proteolytic enzymes at the site of acute inflammation. These proteases cause tissue damage but are inactivated by protease-inhibitors which have been thought to finish their activity. We paid attention to these protease--protease-inhibitor complexes and examined their roles. Trypsin was used as a proteolytic enzyme and was mixed with an excess of purified alpha 1-antitrypsin (alpha 1AT). The trypsin-alpha 1AT complex was separated from native alpha 1AT by column chromatography. Then the complex was incubated with human neutrophils and lysosomal enzyme release was examined. Significant enzyme release was observed when neutrophils were incubated with the complex, but the amount of enzyme release from the cells was not obvious when neutrophils were incubated with alpha 1AT or trypsin alone. The amount of lysosomal enzyme release was proportional to the amount of the complex added. Further study revealed that the complex did not have much influence on neutrophil chemotaxis or superoxide radical generation, but could activate complement by the classical pathway. These facts indicate that protease--protease-inhibitor complexes play a role in prolonging inflammation.

Adult↗
PubMed1984

Curious manifestations in cavernous hemangioma of the liver.

We report a cavernous hemangioma of the liver with some curious findings. Angiography showed a hypervascular lesion and the arterioportal shunt which commonly is regarded as a pathognomonic sign of malignancy. Laparoscopy showed a well-defined, reddish-purple elevated lesion with a central umbilication. As the patient was a painter and dealing with vinyl chloride monomer, we suspected the possibility of hemangiosarcoma. The lesion proved to be a cavernous hemangioma with central fibrous replacement probably in consequence of thrombosis of some cavernous spaces.

Angiography↗
PubMed1983

Secretory component and IgA in endometrial adenocarcinomas. An immunohistochemical study.

The localization of secretory component (SC) and IgA was immunohistochemically studied in 6 normal endometrium and 55 endometrial adenocarcinomas including 34 well, 11 moderately and 10 poorly differentiated ones. In normal endometrium, SC localization was found in the cytoplasm of epithelial cells and luminal contents of the gland. IgA showed similar localization of SC. Secretory phase endometrium contained proportionally larger numbers of positive cells for SC and IgA than proliferative phase endometrium. SC localization was found in all cases of well and moderately differentiated carcinomas, while it was found only in 4 cases out of 10 poorly differentiated carcinomas. IgA localization was similar to that of SC and this condition was thought to reveal the binding of IgA to SC existing in the tumor cells. The present immunohistochemical study revealed that the staining intensity of SC well correlated with the histological grade of differentiation of the tumors.

Adenocarcinoma↗
PubMed1981

Ultrastructure of adenocarcinoma of Bartholin's gland.

The case of a 41-year-old woman with well-differentiated papillary adenocarcinoma of the Bartholin's gland was studied submicroscopically. The tumor consisted of three types of cells with different types of exocrine secretory granules: (1) Principal cells, which were the most frequently observed component of the tumor, had numerous small, secretory granules of round shape with very high electron density. These granules resembled membrane-bound dense bodies observed in normal Bartholin's duct cells. (2) Goblet-like cells had larger secretory granules with low electron density, resembling secretory granules of normal Bartholin's gland cells. (3) Eccrine sweat gland-like cells had large, irregular-shaped secretory granules with moderate electron density. This has been observed in neither normal Bartholin's gland nor duct cells, and resembles secretory granules of eccrine sweat gland cells. Furthermore, fibrillar bodies, frequently described in normal Bartholin's gland cells, were seen in a few tumor cells. These submicroscopic findings suggest that this tumor derived from Bartholin's duct cell, differentiating to gland cell and/or eccrine sweat gland cell.

Adenocarcinoma, Papillary↗
PubMed1981

Natural cell-mediated cytotoxicity in Sjögren's syndrome and rheumatoid arthritis.

Natural cell-mediated cytotoxicity (NCMC) was measured in 7 patients with Sjögren's syndrome without complication of connective tissue disease, 5 patients with Sjögren's syndrome associated with connective tissue disease other than rheumatoid arthritis (RA), 13 patients with Sjögren's associated with RA, and 29 patients with RA without Sjögren's. All 25 patients with Sjögren's syndrome showed a significantly suppressed NCMC. In the patients with RA but without Sjögren's, the NCMC for 21 female patients was rather enhanced when compared with controls, while 8 male patients did not differ from controls. The reduced NCMC in the Sjögren's patients did not seem to correlate with the presence of antilymphocyte antibody. A more accelerated rate of NCMC was demonstrated in the patients with RA who were receiving gold therapy.

Adult↗
PubMed1981

[Studies of solid ovarian tumors in Tokai District (author's transl)].

The prognosis of patients with ovarian carcinoma is believed as worst among malignant diseases in the field of gynecology. Multiple factors including clinical stage, histologic type and grade may play an important role in the prognosis of patients. Because of these factors and the few cases of ovarian carcinoma seen in any one center over a short period, the ability to make valid evaluation of these factors has been limited. We organized ovarian tumor studying group in Tokai district with eleven member hospital and analyzed 453 cases of solid ovarian tumor retrospectively. 1) Cumulative survival rate was calculated according to the clinical stages. Five year survival rate of stage 1 was about 80%, that of stage 2 was about 30% and that of stage 3 and stage 4 were around 10% respectively. 2) Cumulative survival rate was calculated according to histologic types. There was minor variation of survival by histologic types. When we compared with different histologic types by same clinical stages such as stage 1 and stage 3 there was no definite differences of survival rate except slightly poor prognosis in case of mucinous cystadnocarcinoma. 3) Cumulative survival rate was calculated according to histologic grading. Histologic grade affects the prognosis of patients with ovarian carcinoma.

Adolescent↗
PubMed1979

Argyrophil cell carcinoma of the uterine cervix with ectopic production of ACTH, beta-MSH, serotonin, histamine, and amylase.

The case of a 38-year-old female with primary argyrophil cell carcinoma of the uterine cervix is reported. Two years after operation the patient developed widespread metastases with typical Cushing's syndrome. Microscopically, the tumor consisted of solid anaplastic cells, adenocarcinoma, and squamous cells. The plasma levels of ACTH and cortisol were elevated. Many cells of both the primary and metastatic tumors showed argyrophilia. Almost all the cells of the metastases contained numerous round secretory granules measuring about 117 micrometers in diameter. Small rod-shaped or larger round secretory granules, measuring 250 and 430 micrometers respectively, were also found in a few of these cells. The tumors in the right lung, pancreas, and kidney contained high levels of ACTH, beta-MSH, serotonin, histamine, and amylase. This is the first report of ectopic production of these five substances from argyrophil cell carcinoma of the uterine cervix.

Adrenocorticotropic Hormone↗
PubMed1976

Rheumatoid factor-producing cells detected by direct hemolytic plaque assay.

Lymphocytes secreting anti-IgC antibodies, rheumatoid factors (RF), can be detected in the peripheral bloods, synovial fluids, and bone marrows of patients with seropositive rheumatoid arthritis by using a direct plaque-forming cell (PFC) assay with sheep erythrocytes sensitized with reduced and alkylated rabbit IgG hemolysin. The autospecific nature of the RF produced by RF-PFC was indicated by inhibition studies in which the order of patency was human IgG greater than rabbit IgG greater than bovine IgG. In metabolic studies puromycin, cycloheximide, and venblastine suppressed RF-PFC. Cyclic AMP and cyclic GMP were without effect. A need was recognized for using full tissue culture media during the cell separation and plaquing procedures to optimize detection of the RF-PFC. RF-PFC may appear in the blood of patients intermittently despite their continuing presence in the bone marrow. They have been found in the peripheral blood, especially during acutely exacerbating polyarticular synovitis, generalized vasculities, or generally active, aggressive disease. RF-PFC were found in synovial effusions of new or recrduescent acute synovitis. RF-PFC were observed to disappear from the peripheral circulation and the bone marrow during therapy with cytotoxic drugs. The data are consistent with the hypothesis that the appearance of RF-PFC in the peripheral blood represents an anamnestic response to transiently appearing antigen. The nature of the antigen is not specified. The bone marrow may be a site of origin of RF-PFC.

Antibody Specificity↗