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Biomedical subjects

M Oda

Publications and source records attributed to M Oda.

At least 469 records · Page 26Linked to original sources
PubMed1987

An experimental study of the circulation of the vocal fold on phonation.

The ischemic change of the vocal fold on phonation was studied with an oxygen electrode using the canine vocal fold. Oxygen pressures of a limited area of the vocal fold were measured in the lamina propria and vocal muscle at the middle of the membranous portion. The results are summarized as follows: oxygen pressure in each area decreased on phonation as compared with respiratory movement, an ischemic change of the vocal fold occurred on phonation, and the response in the lamina propria was less than that of the vocal muscle.

Animals↗
PubMed1987

1-Acyl-2-acetyl-sn-glycero-3-phosphocholine from stimulated human polymorphonuclear leukocytes.

1-Acyl-2-acetyl-sn-glycero-3-phosphocholine (1-acyl-2-acetyl GPC) was found in the fraction of platelet-activating factor obtained from stimulated human polymorphonuclear leukocytes (PMN). The amount of 1-acyl-2-acetyl GPC obtained from 1 X 10(7) PMN stimulated with ionophore A23187 at 37 C for 15 min ranged from 8 to 56 pmol (32 +/- 10 pmol, mean +/- standard error; n = 4). The main species was 16:0 palmitoyl (17 +/- 5 pmol), followed by 18:0 stearoyl (8 +/- 3 pmol) and 18:1 oleoyl (7 +/- 3 pmol). Although the physiological significance is unknown, 1-acyl-2-acetyl GPC was always detected when 1-alkyl-2-acetyl GPC was detected.

Animals↗
PubMed1987

Effects of FUT-175, a novel synthetic protease inhibitor, on the development of adjuvant arthritis in rats and some biological reactions dependent on complement activation.

1. The effects of FUT-175 on the development of adjuvant arthritis in rats were studied and compared with those of indomethacin. FUT-175 inhibited both primary and secondary paw lesions in the adjuvant arthritic rats when it was administered orally on a daily basis from the day before through 18th day after adjuvant injection. 2. In addition, FUT-175 inhibited the increase in hemolytic complement in adjuvant arthritic rats in a dose-dependent manner. 3. Indomethacin also showed an inhibitory effect on the development of arthritic lesion, but had no effect on the increase in hemolytic complement in the adjuvant arthritis in rats. 4. Furthermore, FUT-175 inhibited the activities of various proteases in vitro, and then strongly inhibited complement-mediated hemolysis via the classical and alternative pathways, while indomethacin had no effect on them. 5. These results suggest that the anti-inflammatory activity of FUT-175 may differ from indomethacin in the mechanisms of action and, at least in part, due to the anti-complement activity.

Animals↗
PubMed1987

Thyroidectomy and neck dissection for the carcinoma of the thyroid gland in children.

A peculiarity in thyroid cancer in children is discussed in terms of clinical course and pathology. A case report of well differentiated papillary carcinoma of the thyroid gland in a 6-year-old boy is presented, with emphasis on the clinical course and pathology. The clinical course indicated a slowly growing, firm tumor lateral to the superior cornu of the thyroid cartilage, up to the hyoid bone. As treatment of the tumor and its lymph node metastases, a hemithyroidectomy with simple neck dissection was performed. Thyroid hormone was administered for suppression of endogenous thyroid-stimulating hormone postoperatively, and the patient tolerated this therapy well. An review of the literature dealing with the question of whether or not a radical neck dissection is appropriate in thyroid cancer in children was carried out.

Adenocarcinoma, Papillary↗
PubMed1987

Mechanism of erroneous Dextrostix readings.

The mechanism of hyper-reactivity of the Dextrostix system when contaminated with alcoholic skin cleaning agents was investigated. When sodium fluoride was supplied to block glucose oxidase activity and hydrogen peroxide was exogenously provided benzidine peroxidation could be preferentially studied. Benzidine hydrochloride was the most likely site of the hyper-reaction.

1-Propanol↗
PubMed1987

Cell-mediated cytotoxicity-supporting activity of various human gammaglobulin preparations.

Antibody activity, especially that involved in the reaction of antibody-dependent cell-mediated cytotoxicity (ADCC), of five commercially available human gammaglobulin preparations (standard, pepsin-treated, plasmin-treated, polyethylene glycol-fractionated and S-sulfonated gammaglobulin) was measured. All these gammaglobulin preparations had high titers of hemagglutination inhibition and neutralizing antibody against measles virus. In ADCC reaction, the pepsin-treated gammaglobulin preparation showed no antibody activity. The standard gammaglobulin preparation showed weak activity only when highly diluted. The remaining three preparations showed high activity. Though the S-sulfonated gammaglobulin preparation showed no activity in ADCC reaction, it showed high activity after reconversion by means of oxidation and reduction in vitro. The plasmin-treated gammaglobulin preparation showed greater activity than the polyethylene glycol-fractionated preparation of the optimal concentration. In ADCC tests using the plasmin-treated gammaglobulin preparation, K cell activity was strongly inhibited by Hg (thimerosal), while, in those using the standard gammaglobulin preparation, the activity was hardly influenced by Hg, suggesting that the low ADCC activity of the standard gammaglobulin preparation of high concentrations was due to the inhibitory effect of aggregated immunoglobulin G molecules.

Antibody-Dependent Cell Cytotoxicity↗
PubMed1987

Production of hepatitis B virus surface antigen particles by the human hepatoma cell line huGK-14 in a serum-free medium.

The human hepatoma cell line, huGK-14, containing integrated hepatitis B virus (HBV) DNAs, produced a large number of 23 nm spherical particles of HBV surface antigen (HBsAg) in a serum-free medium. These particles closely resembled the HBsAg particles found in the sera of HBV carriers and elicited a high antibody response in guinea pigs. The huGK-14 cells in a serum-free medium would provide a new, economic source of HBV vaccine.

Antibody Formation↗
PubMed1987

[Malignant changes in a craniopharyngioma].

The authors report a rare case of a 10-year-old girl with craniopharyngioma which showed malignant change after the first operation and irradiation. In June 1981, the patient complained of headache, nausea and vomiting. CT revealed obstructive hydrocephalus due to the calcified mass lesion which extended to the third ventricle. In order to alleviate the high intracranial pressure, the right ventriculo-peritoneal shunt was first settled and after that, partial removal of the tumor was performed. The pathological diagnosis of the specimen was typical adamantinomatous type of craniopharyngioma without any findings of malignancy. After this operation irradiation was performed. The tumor almost disappeared and the patient was discharged from the hospital and went to school, showing some signs of panhypopituitarism. In May 1984, she complained of decreased left visual acuity, right temporal anopsia, headache, nausea and vomiting. CT revealed recurrence of the tumor which obstract the foramen of Monro bilaterally. As an emergency measure, the left ventriculo-peritoneal shunt was added and the state of the patient became recovered. In order to improve decreased visual acuity, the tumor located around the optic nerves and over the frontal base was removed in June 1984, resulting in partial improvement of visual acuity bilaterally. The pathological examination of the second specimen showed, in addition to the part of adamantinomatous type of craniopharyngioma which was the same as before, the existence of thick layer of stratified large atypical cells which partially covered the cyst wall and partially invaded into the surrounding tissues. The pathological diagnosis was poorly differentiated squamous cell carcinoma with craniopharyngioma of 'adamantinoma' type.(ABSTRACT TRUNCATED AT 250 WORDS)

Ameloblastoma↗
PubMed1986

Revised assignment for the Bacillus subtilis spo0F gene and its homology with spo0A and with two Escherichia coli genes.

The nucleotide sequences of spo0F mutant genes which block the early sporulation process of Bacillus subtilis were determined. The mutation sites together with the results of complementation tests suggested that an open reading frame for a polypeptide of Mr = 14,229 is the spo0F gene. The deduced amino acid sequence shows striking homology with that of the spo0A gene. In addition, the upstream region involving the rib some binding site of the spo0F coding region is also similar to those of spo0A and spo0B. These homologies suggest that all three genes have a similar function in regulating the initiation of sporulation, and that their expression is controlled by a common mechanism. Clear homology is also seen between the spo0 gene products and the transcriptional control proteins, OmpR and Dye, of Escherichia coli suggesting that the spo0 gene products also are involved in the control of transcription.

Alleles↗