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H Kawamoto

Publications and source records attributed to H Kawamoto.

At least 145 records · Page 8Linked to original sources
PubMed1995

Nitroxidergic vasodilator nerve in the canine nasal mucosa.

The canine nasal mucosa was studied by in vitro bioassay. Non-adrenergic, non-cholinergic (NANC) vasodilator response to transmural electrical stimulation was observed in the presence of guanethidine and atropine. This vasodilator response was abolished by NG-nitro-L-arginine (L-NA) which is an inhibitor of nitric oxide (NO) formation but not by NG-nitro-D-arginine. The inhibitory effect of L-NA was partially reversed by treatment with L-arginine but not with D-arginine. The vasodilator response was significantly suppressed by tetrodotoxin. The present results indicate that NO may mediate neurogenic vasodilation in the canine nasal mucosa.

Animals↗
PubMed1995

Secretion of growth hormone (GH)-releasing hormone by GH-producing pituitary adenoma assessed by cell immunoblot analysis.

To detect growth hormone-releasing hormone (GHRH) secreted by monodispersed human GH-producing pituitary adenoma cells, the cell immunoblot assay was performed. GHRH-secreting cells were observed in 3 cases of GH-producing pituitary adenomas. The incidence of GHRH-secreting cells in the total cell populations was 0.24-3.42%. By contrast, no GHRH-secreting cells were observed in 2 cases of clinically nonfunctioning pituitary adenomas. The findings obtained by immunohistochemical studies for adenohypophysial hormones and for nuclear antigens of proliferative activity revealed that the incidence of GHRH-secreting cells is more related to the frequency of GH cells than to the proliferative activity in GH-producing pituitary adenomas.

Adenoma↗
PubMed1995

[Scar liver].

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Adolescent↗
PubMed1994

Extraocular muscles in Graves ophthalmopathy: usefulness of T2 relaxation time measurements.

PURPOSE: To determine if T2 relaxation time measurements with magnetic resonance (MR) imaging in patients with Graves ophthalmopathy (GO) can predict response to therapy. MATERIALS AND METHODS: Studied were 84 patients with GO, 27 with Graves disease without ophthalmopathy (GD), and 12 control subjects without Graves disease. T2 times of extraocular muscles and retrobulbar fat tissue were measured. Twenty-five patients with GO were treated with systemic corticosteroids and retroorbital radiation therapy. RESULTS: T2 relaxation times of muscles in patients with GD were the same as those in controls but were longer in patients with GO (P < .05). T2 times of fat in all patients were the same as those of the controls. The predicted probability of response to treatment increased with increased mean T2 relaxation times of extraocular muscles prior to therapy. Of the 25 patients with combined therapy, only those with particularly prolonged T2 relaxation times showed impressive response. CONCLUSIONS: T2 relaxation time measurements with MR allow noninvasive detection of acute muscle inflammation and predict which patients with GO will likely benefit from antiinflammatory therapy.

Adipose Tissue↗
PubMed1994

Increased levels of inhibitory G protein in myocardium with heart failure.

To identify any differences in inhibitory G protein (Gi) attributable to species or the cause of heart failure, we studied the changes in this protein in different animal models of heart failure: 1) different species; rats vs. hamsters (F1B) with cardiomyopathy induced by adriamycin (ADR) and 2) different etiologies; rats with ischemic heart failure (IHD) due to coronary artery ligation vs. rats with cardiomyopathy induced by ADR and F1B (20-week-old) hamsters with cardiomyopathy induced by ADR vs Syrian hamsters BIO 14.6 (40-week-old) with genetic cardiomyopathy, using Western blotting methods and ADP-ribosylation. We also sought to determine whether changes in the amount of Gi protein reflected the regulation of adenylate cyclase. The amount of immunodetectable Gi rose by 35% (p < 0.05) in ADR rats, 25% (p < 0.05) in ADR hamsters, 15% (p < 0.05) in IHD rats, and 28% (p < 0.05) in BIO 14.6 hamsters, as compared with control rats, F1B (20-week-old) hamsters, sham-operated control rats, and F1B (40-week-old) hamsters, respectively. Assessment of Gi by pertussis toxin-catalyzed ADP-ribosylation revealed increases in Gi of 24% (p < 0.05) in ADR rats and of 44% (p < 0.05) in BIO 14.6 hamsters, as compared with their respective controls. Gi function, as assayed by the acetylcholine-induced inhibition of adenylate cyclase, also increased. Thus, Gi protein appears to contribute to the changes in signal transduction in myocardium with heart failure.

Adenylyl Cyclases↗
PubMed1994

Thyroglobulin and lactic dehydrogenase isozymes in cystic fluid of thyroid nodules.

Although fine needle aspiration biopsy (FNAB) is most valuable in the diagnosis of thyroid cancer, it is hampered by the fact that no specimen suitable for cytological examination can be collected from all cystic lesions. Often inadequate aspirates, consisting only of fluid or a few foamy cells and lacking the necessary epithelial cells, are all that an aspirationist is able to collect. Therefore an alternative method of determining the benign or malignant characteristics of cyst fluid is of vital importance. In this study we examine thyroglobulin (Tg) concentrations and lactic dehydrogenase (LDH) isozyme patterns of cyst fluid and discuss how these variables help us estimate the probability of malignancy. Fifty-three differentiated cancers (39 papillary and 14 follicular carcinomas) and 72 surgically resected benign thyroid nodules (40 adenomas, 19 colloid goiters, and 13 cysts) were analyzed. Only 28 (53%) of 53 malignant lesions were correctly diagnosed by FNAB. The mean logarithmic value for the Tg concentration (log10 Tg) was significantly lower in malignant cyst fluid than it was in benign nodules (mean +/- SD: 5.8 +/- 1.0 vs. 6.8 +/- 1.0; P < 0.001). The LDH 1 and 2 isozyme percentage was greater in the malignant group than in the benign group (49.1 +/- 12.7% vs. 38.1 +/- 16.9%; P < 0.01). In multiple logistic regression analysis, log10 Tg and the total of LDH 1+2 percentage was significant in estimating the probability of malignant nodules. The results of our study suggest that determining the Tg concentration and the LDH isozyme patterns of cyst fluid could provide new information for the evaluation of cystic thyroid nodules.

Body Fluids↗
PubMed1994

Specificities and clinical significance of anti-cytoskeleton antibodies in anti-smooth muscle antibody-positive patients with chronic liver disease C.

We investigated the specificities and characteristics of anti-cytoskeleton antibodies in 13 anti-smooth muscle antibody (ASMA)-positive patients with chronic liver disease C (CLD-C), and compared them with those in 7 ASMA-positive patients with autoimmune hepatitis (AIH), and 6 ASMA-positive patients with chronic liver disease B (CLD-B). Anti-microfilaments (anti-MF) were found not only in 6/7 AIH patients (85.7%), but also in 8/13 CLD-C patients (61.5%) with a relatively high incidence, when compared with 1/6 CLD-B patients (16.7%), while, there was no significant difference in the incidence of anti-intermediate filaments (anti-IMF), especially anti-IMF IgM, among these patient groups. Among the patients with CLD-C, the mean levels of serum gammaglobulin and IgG in the anti-MF-positive patients were 2.46 +/- 1.03 g/dl and 3277 +/- 1089 mg/dl, respectively, which were higher than those in the anti-MF-negative patients (1.60 +/- 0.53 g/dl, 2245 +/- 610 mg/dl) and those in the patients with CLD-B (1.60 +/- 0.57 g/dl, 2192 +/- 339 mg/dl). Furthermore, 4 of the 8 anti-MF-positive patients with CLD-C satisfied the serological criteria for the diagnosis of AIH. These findings suggest that autoimmune mechanisms might be involved in the pathogenesis of anti-MF-positive CLD-C, and that anti-MF might be used as a marker.

Adult↗
PubMed1994

[Fluorometric determination of selenium in breast milk: studies on wet ashing].

A fluorometric method for the determination of selenium content in breast milk was studied. After the wet ashing of breast milk with nitric acid and perchloric acid at 160 degrees C for about 2.5-3 hours and the reduction with 6 mol/l hydrochloric acid, selenium was determined by 2,3-diamino-naphthalene fluorescence reaction. The method described here is very simple and all procedures were performed in a single-test-tube, and fifty samples could be assayed within 5 hours. With this method, analytical recoveries of 20 ng/ml and 50 ng/ml selenium added to breast milk were 95.3% (n = 10, cv = 5.96%) and 100.8% (n = 10, cv = 5.72%). Selenium contents of breast milk obtained from 37 Japanese women delivered healthy were 22.0-71.6 ng/ml, mean = 40.79 ng/ml (1 week postpartum) and 12.0-40.8 ng/ml, mean = 24.52 ng/ml (1 month postpartum).

Female↗
PubMed1993

A point mutation in the 5' splice region of intron 7 causes a deletion of exon 7 in adenosine deaminase mRNA.

An adenosine deaminase (ADA;EC 3.5.4.4)-deficient B lymphoblastoid cell line BAD05 derived from a Japanese patient with severe combined immunodeficiency was characterized. As previously reported, one allele of BAD05 expresses undetectable ADA mRNA, and the other allele produces an aberrant mRNA without exon 7. Genomic ADA DNA of BAD05 spanning from a portion of exon 6 to a portion of exon 8 was amplified by PCR. The amplified fragments were cloned into a vector, and 8 clones were isolated and sequenced. The analytical result showed a single base change of G to A at the invariant 5' GT of intron 7 of ADA gene in one allele of BAD05, which accounts for the elimination of exon 7 during splicing.

Adenosine Deaminase↗
PubMed1993

Small, round-structured viruses (SRSVs) associated with acute gastroenteritis outbreaks in Gifu, Japan.

Two outbreaks of non-bacterial gastroenteritis occurred in Gifu prefecture in January 1989 and in January 1991. Both outbreaks were closely related to the consumption of raw oysters, and showed similar clinical features. Small, round-structured virus particles were found in patient stools in both outbreaks by electron microscopy. The role of these particles as the causative agents of the outbreaks were strongly suggested by immune electron microscopy and/or western-blotting immunoassay. When compared with SRSV-9 (Tokyo/SRSV/86-510) reported previously (Hayashi et al, J. Clin. Microbiol., 27: 1728-1733, 1989), it was found that these viral particles were antigenically similar to SRSV-9, and had a major structural protein of 63 kilodaltons (kDa). Further, the prevalence of this agent in Gifu area was examined by western blot antibody assay using 67 serum samples collected from the inhabitants in 1991. The results indicated the circulation of the same or antigenically similar agent in this area.

Adult↗
PubMed1993

Characterization of adenosine deaminase (ADA)-negative B-lymphoblastoid cells cocultured with ADA-positive fibroblasts.

A cell line, BAD05, derived from B lymphocytes of an adenosine deaminase (ADA; EC 3,5,4,4)-deficient patient could not proliferate in a serum-free medium containing 100 mumol/l deoxyadenosine. When BAD05 was cultured with ADA-positive fibroblasts, the proliferation of BAD05 was improved. BAD05 cell density increased when the initially mixed ratio of fibroblasts/BAD05 was 1/10 or higher, but decreased when the ratio was 1/20 or lower. Deoxyadenosine concentrations in the medium and ATP and deoxyATP (dATP) levels in the BAD05 were measured after 4 hours of coculture at initial BAD05 cell densities of 1 x 10(5) and 1 x 10(6) cells/ml. Deoxyadenosine concentrations in the medium decreased as the density of fibroblasts increased. The dATP level decreased as the mixed ratio rose. The ratio of fibroblasts/BAD05 rather than the cell density of fibroblasts had a larger effect on the dATP levels in BAD05. Under our experimental conditions, ADA-negative cells proliferated well when the ratio of ADA-positive cells/ADA-negative cells was over 1/10.

Adenosine Deaminase↗
PubMed1993

Autoimmune responses as assessed by hypergammaglobulinemia and the presence of autoantibodies in patients with chronic hepatitis C.

We investigated autoimmunity, as assessed by hypergammaglobulinemia and the presence of autoantibodies including anti-nuclear antibodies (ANA) and anti-liver membrane antibodies (LMA), in 149 patients with chronic hepatitis C, 55 patients with chronic hepatitis B and 11 patients with autoimmune hepatitis. There was no significant difference in the incidence of these autoantibodies between chronic hepatitis C and chronic hepatitis B. Nine patients with chronic hepatitis C satisfied the serological criteria of autoimmune hepatitis (ANA positive and gammaglobulin or serum IgG greater than 2500 mg/dl), but none of the patients with chronic hepatitis B met the criteria. This suggests that autoimmunity is greater in chronic hepatitis C than in chronic hepatitis B. Of the 9 patients with chronic hepatitis C, all 4 patients tested for human leukocyte antigen (HLA) phenotype had HLA-DR4, which is known to be associated with autoimmune hepatitis in Japanese patients. We believe that hepatitis C virus (HCV) infection enhances the initiation and perpetuation of autoimmunity in susceptible individuals.

Adult↗
PubMed1993

[Quantitative evaluation of 111In-antimyosin Fab myocardial imaging in acute myocardial infarction patients].

Quantitative evaluation of 111In-antimyosin Fab myocardial (InAM) imaging was performed in 15 patients with acute myocardial infarction to evaluate which organ is the most appropriate for the control of myocardial accumulation, to compare the quantitative method with the conventional visual method, and to study which clinical indices correlate with the InAM quantitative evaluations. InAM images demonstrated the myocardium with 31 +/- 6 mean counts/pixel, lung with 14 +/- 4, upper mediastinum with 20 +/- 5, middle mediastinum with 26 +/- 5, and liver with 75 +/- 10. We considered the lung to be the most appropriate control organ for quantitative evaluations of InAM imaging, because it could be separated from the myocardium, and the measurement range was narrow. The InAM uptake index [IUI = (myocardial counts-lung counts)/lung counts] was calculated as the index of myocardial accumulation. Visual evaluations of myocardial accumulation on InAM images were classified into three grades. The IUI of grade 1 (slight) was 0.98 +/- 0.19, grade 2 (moderate) was 1.34 +/- 0.38, and grade 3 (severe) was 1.97 +/- 0.19. Visual grading was nearly in accordance with the IUI, although it was difficult to distinguish visually between grades 1 and 2. Measurement of wall motion by left ventriculography showed that reduced wall motion was associated with an IUI of 1.01 +/- 0.18 and dyskinesis with an IUI of 1.92 +/- 0.16, showing IUI can indicate regional myocardial damage. However, IUI was not correlated with indices of the overall left ventricular function, such as ejection fraction, cardiac index, and peak creatine kinase level.

Antibodies, Monoclonal↗
PubMed1993

A study on the lung function in alpha 1-antitrypsin-deficient (PiMZ) patients.

Laurel and Eriksson published the first report indicating that alpha 1-antitrypsin deficiency predisposed patients to the development of Chronic Obstructive Pulmonary Disease (COPD). For the purpose of early detection, disturbances of pulmonary function in alpha 1-antitrypsin mild deficiency cases (PiMZ) were compared with those of normal cases (PiMM) in caucasian Americans. The marked results are as follows. 1) Parameters of flow-volume curves were more disturbed in PiMZ cases than in PiMM cases. 2) Volumes of isoflow are specially different between PiMZ and PiMM cases. 3) Mechanical properties, like lung work of breathing, were larger in PiMZ cases than in PiMM cases.

Adult↗
PubMed1992

[A clinical observation of cases which was suspected of congenital cholesteatoma].

Four cases which was suspected of congenital cholesteatoma were treated in the past 15 years. The age of the patients ranged from 4 to 17 years. In all cases, the cholesteatoma arose in the middle ear. In one case the cholesteatoma extended into the mastoid cavity. Tympanoplasty of colummella type III was indicated. Postoperative hearing gain was from 20 to 30dB. Although the incidence is low, otolaryngologists must be aware of congenital cholesteatoma when treating conductive hearing loss with a normal ear drum.

Adolescent↗
PubMed1992

[Acute myocardial infarction: comparison of results of Tl-201, Tc-99m pyrophosphate and In-111 antimyosin Fab imagings].

To evaluate the extent and characteristics of infarct areas, we performed indium-111 monoclonal antimyosin Fab (InAM), thallium-201 (TL) and Tc-99m pyrophosphate (PYP) imagings in 17 patients with acute myocardial infarction, and tried to find out the mechanism that causes difference of these imagings. In each study, the extent scores as an index of the infarct area were obtained by single photon emission computed tomography (SPECT), and comparisons were made between the results obtained. The overlap between InAM and TL imagings obtained by SPECT was evaluated. Location, severity, extent and patterns of accumulation were compared between InAM and PYP with both planar image and SPECT. The extent scores of InAM correlated well with those of TL (r = 0.73, p < 0.01). However, the overlap of both methods was recognized in 8 of 17 patients, in whom wall thickness of the infarct area as obtained by echocardiography was well preserved. The left ventricular regional asynergy was mild in 6 of these 8 patients. Coronary angiography showed poor or no collateral circulation in these cases. Although there were generally close correlations of the extent scores between InAM and PYP, discrepancy was noted in 2 cases for location; 2 for severity, 5 for extent, and 3 for patterns of accumulation. These differences may be attributed to the timings of imaging, coronary reperfusion and different mechanisms of accumulation. In conclusion, the extent of acute myocardial infarction obtained by InAM correlates well with those obtained by TL and PYP, with some exceptions.

Adult↗