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Biomedical subjects

Y Hamada

Publications and source records attributed to Y Hamada.

At least 469 records · Page 26Linked to original sources
PubMed1986

Recurrence of coronary artery spasm after successful percutaneous transluminal coronary angioplasty.

A 47-year-old man presented with angina, and coronary angiograms showed a significant organic stenosis with spasm in the left anterior descending coronary artery. Percutaneous transluminal coronary angioplasty was successfully performed for the organic lesion in the left anterior descending coronary artery. Symptom of angina due to coronary artery spasm recurred, even without restenosis at the site of successful angioplasty.

Angina Pectoris↗
PubMed1986

Malabsorption of long-chain fatty acid in cholera toxin-induced secretory diarrhea.

The effects of cholera toxin-induced diarrhea on the absorption of fatty acids of different chain lengths were investigated using rat small intestine. In the study using isolated jejunal loops, the absorption of the long-chain fatty acid, linoleic acid, into the intestinal mucosa was significantly impaired 90 min after the administration of linoleic acid micelles in the cholera toxin-treated rats. This reduction of linoleic acid absorption in the cholera toxin-treated rats was not found at 180 min. We could not find any mucosal accumulation of labeled linoleic acid or disturbance of triglyceride formation in the intestinal mucosa as compared with that of controls. The amount of linoleic acid transported into the intestinal lymph was delayed and reduced in cholera toxin-treated rats. Furthermore, the absorption of the medium-chain-length fatty acid, octanoic acid, was unchanged in the cholera toxin-treated rats. These results suggest that intestinal secretion induced by cholera toxin may delay the mucosal uptake and lymphatic transport of long-chain fatty acids. Cholera toxin may not affect triglyceride formation in the epithelial cells.

Animals↗
PubMed1986

Pathological findings of lymphangiectasia of the large intestine in a patient with protein-losing enteropathy.

Lymphangiectasia of the large intestine associated with protein-losing enteropathy is reported. A 33-yr-old man suffered from diarrhea, sometimes mixed with blood. Colonoscopic study revealed reddish and edematous mucosa with multiple flat elevated lesions and giant folds in the localized segment of the rectosigmoid. An intestinal clearance test of alpha 1-antitrypsin revealed the association of protein-losing enteropathy. Operation was performed successfully, resulting in a marked improvement of symptoms and laboratory data, especially serum total protein, albumin, IgG, and Leu-2a-positive cells (suppressor/cytotoxic T cells). Giant folds consisted of the submucosal edema and hyperplasia of the epithelial glands with cystic dilatation of glands, and flat elevated lesions consisted of mucosal and submucosal edema associated with intestinal lymphangiectasia, adipose tissue, and blood capillaries. The population of the Leu-2a-positive cells in the lamina propria and intraepithelial layer was decreased and that of the Leu-3a-positive cells (helper/inducer T cells) in the lamina propria was increased.

Adult↗
PubMed1986

[Comparative study of estrogen receptor assays between immunocytochemical assay using monoclonal antibody and the dextran- coated charcoal method].

Estrogen receptor (ER) was measured by the estrogen receptor-immunocytochemical assay (ER-ICA) using monoclonal antibody in 36 mammary carcinomas. Simultaneously, ER and progesterone receptor (PgR) were measured by the dextran coated charcoal (DCC) method. In ER-ICA, tumor cells with estrogen receptors were histologically observed. The proportion of ER-positive tumor cells among tumor tissues and the levels of staining intensity were also examined. Results were compared to those obtained by the dextran coated charcoal (DCC) method. Tumors were evaluated as ER-ICA-positive when they contained more than 10% ER-positive cells. ER at a level of more than 5.0 fmol/mg protein was evaluated ER-positive and PgR at more than 5.0 fmol/mg protein as PgR-positive by the DCC method. Twenty-one out of 24 ER-ICA-positive tumors were ER-positive by the DCC method, and 11 out of 12 ER-ICA-negative tumors were ER-negative by the DCC method. Correlation of ER-ICA and ER by the DCC method was 88.9%. There were 11 PgR-positive tumors, and all were included among ER-ICA-positive tumors which had a high proportion of ER-positive cells and high staining intensities.

Antibodies, Monoclonal↗
PubMed1986

[Immune reactivities of lymphocytes from peripheral blood, regional lymph nodes and tumor-infiltrating lymphocytes in breast cancer].

Immune reactivities in 174 breast cancer patients were investigated. Immune reactivities were assessed by lymphocyte responsiveness to phytohemagglutinin (PHA), suppressor cell activities, sera-induced suppressor cell activities, NK activities and autologous tumor-killing activities. Low responsiveness of peripheral blood lymphocytes (PBL) to PHA mitogen and an increase in the inductive activity of suppressor cells by sera were observed in breast cancer patients as compared with normal volunteers or patients with benign breast diseases. These impairments of immune reactivities were compared with those of patients with cancer of the digestive tract. Cytotoxicities against both K562 and autologous tumor cells were low or absent in the regional lymph node lymphocytes (LNL). Cytotoxicities against autologous tumor cells were absent in tumor-infiltrating lymphocytes. The low NK activity of LNL was not due to coexistent suppressor cells but to a lack of active NK cells and/or their precursors. NK activities of LNL were augmented by IL-2 and OK-432, suggesting usefulness for local immune therapy.

Breast Neoplasms↗
PubMed1985

Large glucagon-like immunoreactivity in a primary ovarian carcinoid.

A primary ovarian carcinoid composed of both trabecular and strumal types was studied by histochemical, immunocytochemical, and biochemical techniques. High contents of glucagon, secretin, and calcitonin were demonstrated in the tumor homogenate. All of the tumor cells, irrespective of histologic type, showed properties of argyrophilia and neurosecretory granules on electron microscopy. Glucagon-producing cells were positive in trabecular carcinoid by immunoperoxidase techniques. Bio-Gel P10 gel filtration showed that the molecular weight of major immunoreactive glucagon in tumor was 20,000. It migrated faster than true glucagon after polyacrylamide gel electrophoresis. No clinical symptoms of glucagonoma developed.

Adult↗