Search PubMed⌕ Search

Biomedical subjects

Y Matsuda

Publications and source records attributed to Y Matsuda.

At least 775 records · Page 43Linked to original sources
PubMed1991

[Allergenic relationships between Aspergillus restrictus and Aspergillus fumigatus determined by radioallergosorbent test inhibition].

Recently Aspergillus restrictus, a species of osmophilic fungi, has been found to be widely distributed in our inhabited environment. The authors reported previously that the prevalence of hypersensitivity to this fungal species determined by skin prick test and radioallergosorbent test (RAST) was comparable with that to Aspergillus fumigatus. In this study, the allergenic relationships between the two fungi were examined by RAST and RAST inhibition tests in which A. restrictus extracts prepared from mycelial mats of two different strains cultured in M40Y liquid medium and A. fumigatus, one made from a mycelial mat cultured in YNB liquid medium containing 3% sucrose, were used. In the RAST inhibition tests using a serum pool obtained from five patients with highly positive RAST to these species, the two extracts of A. restrictus inhibited RAST to A. fumigatus by over 80%, and A. fumigatus extract inhibited RAST to the two strains of A. restrictus by approximately 75%. In A. fumigatus RAST inhibition tests using individual sera with positive A. fumigatus RAST, a strong inhibition (greater than 60%) elicited by each extract of A. restrictus was observed in 5 of 8 sera tested. In RAST, nine of 11 serum samples with positive RAST to A. fumigatus showed positive RAST to both strains of A. restrictus. There was a significant correlation between the RAST values of the two fungal species. These results give evidence of the presence of shared allergenic components between the two fungi, and indicate that these components may contain part of major allergens of A. fumigatus.

Adolescent↗
PubMed1991

[A case of upper brainstem infarction developing symptomatic narcolepsy after the administration of anti-convulsant drugs].

A 52-year-old woman, who had ischemic infarction in the ventral upper brainstem due to subarachnoid hemorrhage in October 1986, had recurrent sleep and cataplexy attacks from May 1987. She was receiving valproate and phenytoin daily since 1986. The diagnosis of narcolepsy was made based on the clinical symptoms and EEG findings showing REM sleep during a sleep attack. Both sleep and cataplexy attack increased in parallel with an increase of the dose of anti-convulsant drugs and disappeared immediately after the discontinuation of the treatment. The findings that suggest that the administration of anti-convulsant drug as well as the brainstem vascular lesion was deeply involved in the development of narcolepsy in this case.

Brain Stem↗
PubMed1991

[A comparative electron microscope study on the fine structure of the muscular coat in the common bile duct].

Little is known about the architecture of common bile duct, especially smooth muscle, except for Oddi's sphincter. The purpose of this study is to reveal the ultrastructural architecture of the upper part of the common bile duct from the viewpoint of comparative anatomy. Animals used in this study were the hamster, rat, dog, monkey and rabbit, and the results obtained were as follows. There were considerable differences in the structural appearance and distribution of smooth muscle cells in the upper part of the common bile duct among the animals examined. In the rat, a small number of smooth muscle cells were sparsely distributed in the subepithelial connective tissue of the duct. In the dog, smooth muscle cells showed a star-shaped appearance with many cytoplasmic processes, by which networks were formed. In the monkey, smooth muscle cells with fibroblast-like appearance were circularly distributed. In the monkey and rabbit, muscular coats consisting of typical smooth muscle cells were observed in the outermost layer of the duct. The muscular coat in the monkey was arranged longitudinally, and in the rabbit circularly. The muscular coat in the rabbit was thicker than that in the monkey. In the hamster, however, the duct wall was devoid of smooth muscle cells. The present study suggests that the occurrence of smooth muscular coat is not essential for transport of the bile.

Animals↗
PubMed1991

[Reliability of the exercise ECG in detecting silent ischemia in patients with prior myocardial infarction].

To assess the reliability of the exercise ECG in detecting silent ischemia, ECG results were compared with those of stress-redistribution thallium-201 single-photon emission computed tomography (SPECT) in 116 patients with prior myocardial infarction and in 20 normal subjects used as a control. The LV was divided into 20 segmental images, which were scored blindly on a 5-point scale. The redistribution score was defined as thallium defect score of exercise subtracted by that of redistribution image and was used as a measure of amount of ischemic but viable myocardium. The upper limit of normal redistribution score (= 4.32) was defined as mean +2 standard deviations derived from 20 normal subjects. Of 116 patients, 47 had the redistribution score above the normal range. Twenty-five (53%) of the 47 patients showed positive ECG response. Fourteen (20%) of the 69 patients, who had the normal redistribution score, showed positive ECG response. Thus, the ECG response had a sensitivity of 53% and a specificity of 80% in detecting transient ischemia. Furthermore, the 116 patients were subdivided into 4 groups according to the presence or absence of chest pain and ECG change during exercise. Fourteen patients showed both chest pain and ECG change and all these patients had the redistribution score above the normal range. Twenty-five patients showed ECG change without chest pain and 11 (44%) of the 25 patients had the abnormal redistribution. Three (43%) of 7 patients who showed chest pain without ECG change had the abnormal redistribution score. Of 70 patients who had neither chest pain nor ECG change, 19 (27%) had the redistribution score above the normal range. Thus, limitations exist in detecting silent ischemia by ECG in patients with a prior myocardial infarction, because the ECG response to the exercise test may have a low degree of sensitivity and a high degree of false positive and false negative results in detecting silent ischemia.

Aged↗
PubMed1991

Factors affecting the patency of stents in malignant biliary obstructive disease: univariate and multivariate analysis.

To investigate the factors affecting the patency of biliary stents, we performed univariate and multivariate analyses in 370 straight stents with diameters of 10- to 12-French gauge which had been inserted singly as palliative treatment in 228 patients with malignant biliary obstructive disease. In the analysis of 226 first stents, advanced age of patients and higher serum bilirubin levels before insertion were found to be significant unfavorable factors limiting the duration of stent function. Overall, older age, male sex, no stent cleaning, and insertion on three or more occasions were significant unfavorable prognostic factors for patency. The risk of occlusion for stents inserted on three or more occasions was 2.32 times that of the first stent insertion. The median duration of patency of first, second, and subsequent stents was 177, 98, and 97 days, respectively. Diagnosis and the area of stenosis were unrelated to patency. No predictive significance of length or size of stent between 10- and 12-French gauge was found in our study.

Actuarial Analysis↗
PubMed1991

Accumulation of glycoprotein in the Golgi apparatus of hepatocytes in alcoholic liver injuries.

To clarify the role of the hepatocytic Golgi apparatus in the accumulation of proteins in the hepatocytes of alcoholic liver disease, changes in the Golgi apparatus in human and experimental alcoholic liver injuries were analyzed. Immunoelectron microscopically, transferrin, one of the secretory glycoproteins from the liver, was retained in the smooth endoplasmic reticulum and Golgi apparatus of the hepatocytes in both human and rat alcoholic liver injuries. Biochemically, transferrin content in the Golgi fraction was clearly high in the rats with alcoholic liver injury. Desialo-glycoproteins were found in the serum of rats with alcoholic liver injuries. These results suggested that the glycosylation and secretion of hepatic glycoproteins in the Golgi apparatus were impaired in alcoholic liver injury. These abnormalities in the Golgi apparatus function may be important for the development of alcoholic liver injury.

Analysis of Variance↗
PubMed1990

Human liver manganese superoxide dismutase. Purification and crystallization, subunit association and sulfhydryl reactivity.

Manganese superoxide dismutase (Mn-SOD) has been purified with a high yield (320 mg) from human liver (2 kg) and crystallized. Low-angle laser light scattering of the enzyme has shown that native enzyme is a tetrametic form. Four of the eight cysteine residues in the tetramer reacted with 5,5'-dithiobis(2-nitrobenzoic acid) or with iodoacetamide. The others were only reactive in protein heated with SDS or urea after reduction with dithiothreitol or 2-mercaptoethanol. The reactive sulfhydryl group was found to be located at Cys196 by amino acid sequence analysis of Nbs2-reactive peptides isolated by activated thiol-Sepharose covalent chromatography. Incubation of Mn-SOD in 1% SDS for 2 or 3 days at 25 degrees C or 5 min at 100 degrees C gave material showing two prominent components on polyacrylamide gel electrophoresis in the presence of 0.1% SDS. The major component had a molecular mass of 23 kDa; the other, 25 kDa. Reduction of the protein by dithiothreitol or 2-mercaptoethanol heated in SDS produced only the 25-kDa monomer species. Essentially, no thiol groups were detected in the 23-kDa form, in which two cysteine residues appear to have been oxidized to form an intrasubunit disulfide. This indicates that Cys196 has a reactive sulfhydryl and appears to be a likely candidate for a mixed disulfide formation in vivo.

Chromatography, Gel↗
PubMed1990

Calcitonin gene-related peptide (CGRP) immunoreactivity in the afferents to the caudate-putamen and perirhinal cortex of rats.

The posterior caudate-putamen and perirhinal cortex are innervated by fibers immunoreactive to calcitonin gene-related peptide (CGRP). We investigated the origins of these fibers by using immunohistochemistry combined with lesion experiments and fluorescent dye tracers. Lesions of the posterior thalamus surrounding the medial geniculate nucleus, in which groups of CGRP-like immunoreactive (CGRP-LI) cells exist, decreased the number of ipsilaterally CGRP-LI fibers in the posterior caudate-putamen and partly in the perirhinal cortex. Some of CGRP-LI neurons in several posterior thalamic nuclei surrounding the medial geniculate nucleus were labeled with both Fast blue injected into the posterior caudate-putamen and fluoro-gold administered into the anterior perirhinal cortex. Our results indicate that CGRP-LI cells in the posterior thalamus, such as posterior intralaminar, lateral subparafascicular and subparafascicular nuclei, project either separately or simultaneously to innervate the posterior caudate-putamen and perirhinal cortex.

Amidines↗
PubMed1990

Distribution of galanin-immunoreactive nerve fibers in the rat nasal mucosa.

Galanin-like immunoreactivity was found in nerve fibers beneath and within the epithelium of the rat mucosa by the use of immunohistochemical techniques. Immunoreactive fibers were also noted close to blood vessels and seromucous glands in the lamina propria. Fast blue applied to the nasal mucosa underwent retrograde transport to some immunoreactive neurons of the trigeminal ganglion. Thus, the rat nasal mucosa was shown to be innervated by galanin-containing sensory nerves.

Animals↗
PubMed1990

Increase in the active form of 3-hydroxy-3-methylglutaryl coenzyme A reductase in human hepatocellular carcinoma: possible mechanism for alteration of cholesterol biosynthesis.

3-Hydroxy-3-methylglutaryl coenzyme A reductase activity and the rate of sterol biosynthesis are positively correlated with DNA synthesis and proliferation of mammalian cells. The total (active plus latent) activity of 3-hydroxy-3-methylglutaryl coenzyme A reductase and the activity of its active form in hepatocellular carcinoma (HCC) from seven patients were measured and compared with those in liver tissue from five control subjects. The activity of the active form in HCC was 61 +/- 21 (SD) pmol/min/mg microsomal protein, while it was only 17 +/- 9.8 pmol/min/mg protein in the liver tissue from the controls; the difference was significant (P less than 0.005). The total activity of the reductase was also higher in HCC although the difference was not significant. The microsomal contents of the enzyme protein also were not significantly different. The rate of cholesterol biosynthesis was 307 +/- 81 pmol/h/mg tissue in HCC and 79.6 +/- 52 in normal liver tissue, indicating a significant increase in the rate in HCC (P less than 0.001). Thus, enhanced synthesis of cholesterol in human HCC seems to result partly from an increase in the active form of the reductase.

Carcinoma, Hepatocellular↗
PubMed1990

Serum-manganese-superoxide dismutase: normal values and increased levels in patients with acute myocardial infarction and several malignant diseases determined by an enzyme-linked immunosorbent assay using a monoclonal antibody.

An enzyme-linked immunosorbent assay (ELISA) has been developed for human manganese-superoxide dismutase (Mn-SOD), using a specific monoclonal antibody raised against the purified enzyme. The Mn-SOD molecule comprises four identical sub-units and this permitted the development of a symmetrical assay, using the same monoclonal antibody as both capture and detector. The assay offers a specific, sensitive and convenient means of measuring immunoreactive Mn-SOD in human sera. Under optimum conditions, the sensitivity of the assay permits the detection of 2-200 ng of purified Mn-SOD from human liver. The mean serum Mn-SOD levels of normal healthy males and females were 99.8 +/- 24.8 (mean +/- SD) and 88.8 +/- 20.8 (mean +/- SD), respectively. A high level of the enzyme was found in the sera of patients with acute myocardial infarction as well as malignant diseases such as acute myeloid leukemia, primary hepatoma and gastric cancer. This is the first report of an ELISA using a monoclonal antibody specific for a distinct epitope of Mn-SOD.

Adult↗
PubMed1990

Inhibition by new anthraquinone compounds, K-259-2 and KS-619-1, of calmodulin-dependent cyclic nucleotide phosphodiesterase.

K-259-2 and KS-619-1, novel anionic anthraquinone metabolites isolated from culture broth of microorganisms, inhibited activation of bovine brain phosphodiesterase induced by calmodulin (CaM), sodium oleate, or limited proteolysis with almost equal potency. The inhibition of calmodulin-activated phosphodiesterase (CaM-PDE) by K-259-2 or KS-619-1 was overcome by a higher concentration of CaM. Direct interaction of K-259-2 and KS-619-1 with CaM was confirmed through use of hydrophobic fluorescent probes. Kinetic analysis revealed that the inhibition of the trypsin-activated phosphodiesterase was competitively inhibited by K-259-2 or KS-619-1 with respect to cAMP. Addition of a lower amount of either phosphatidylserine or sodium oleate to the reaction mixture was efficacious in attenuating the inhibition of the CaM-PDE by W-7, chlorpromazine, trifluoperazine, compound 48/80, or R-24571 but, in contrast, had little or no effect on the inhibition by K-259-2 or KS-619-1. In conclusion, K-259-2 and KS-619-1, unlike so-called CaM antagonists, do not interact with phosphatidylserine or sodium oleate and it appears that these novel anthraquinone compounds inhibit the enzyme not only via CaM antagonism but possibly also by interacting directly with the enzyme.

3',5'-Cyclic-AMP Phosphodiesterases↗
PubMed1990

Contribution of baroreceptor reflexes to blood pressure and sympathetic responses to cholecystokinin and vasoactive intestinal peptide in anesthetized dogs.

The effects of synthetic vasoactive intestinal peptide (VIP) and cholecystokinin (CCK) on systemic blood pressure and renal nerve activity were studied before and after cervical vagotomy, and sino-aortic denervation with vagotomy in anesthetized dogs. Intravenous injection of VIP (5 micrograms/kg) in animals with an intact neuraxis produced a significant decrease in systemic blood pressure and a significant increase in renal nerve activity. These responses to VIP did not change after vagotomy and after complete denervation, VIP did not cause any change in renal nerve activity, even during hypotension. The level of hypotension after complete denervation was greater than that under other conditions. These results indicate that the cardiovascular effects of VIP are reduced by activation of the systemic baroreceptors. Intravenous injection of CCK (10 micrograms/kg) in animals with an intact neuraxis produced significant decreases in blood pressure and renal nerve activity. These responses to CCK were abolished in animals with cervical vagotomy only. However, following complete denervation of the carotid sinus and total section of the vagal nerves, CCK caused a significant increase in blood pressure and renal sympathetic nerve activity. These results indicate that the sympathetic depressor effect of CCK may be mediated by activation of the vagal afferents, and that the sympathetic pressor effect may be due to a direct action of CCK on the central nervous system. Thus, each gastrointestinal peptide may regulate the cardiovascular system through a different mechanism.

Anesthesia↗
PubMed1990

Coronary artery spasm during cardiac angiography.

Unexpected occurrence of coronary artery spasm is sometimes observed during cardiac catheterization. We report here two cases of coronary artery spasm with hypotension and urticaria subsequent to administration of contrast material. The etiology of coronary artery spasm is discussed.

Angiocardiography↗
PubMed1990

Presence of three P types (VP4 serotypes) and two G types (VP7 serotypes) among bovine rotavirus strains.

Cross neutralization tests with a panel of rotavirus strains representing previously described nine VP7 (G) serotypes revealed that bovine rotavirus strain KK-3, a prototype Japanese bovine serotype 2, belonged to a new serotype (G10), confirming and extending the recent report of Snodgrass et al. [J. Clin. Microbiol. 28: 504-507 (1990)] which showed that hyperimmune serum to the KK-3 strain neutralized the B223 strain, a proposed type strain of G10. Further antigenic characteristics of the KK-3 strain, as well as the 0510 strain (a G6 strain isolated in Japan), were examined in terms of their VP4 (P) specificity. For the characterization of P types, we employed genetic reassortants that possess VP4 gene for UK and VP7 gene for D (G1), VP4 gene for NCDV and VP7 gene for SA11 (G3), or VP4 gene for SA11 and VP7 gene for NCDV (G6) in the plaque reduction neutralization assay with hyperimmune sera against these two Japanese strains and the prototype bovine rotavirus NCDV strain. While the 0510 strain had UK-like P and NCDV-like G types, the KK-3 strain had a distinct set of P and G types. Thus, at least three P types (NCDV-, UK-, and KK-3-like) and two G types (G6 and G10) are present among bovine rotavirus strains.

Animals↗
PubMed1990

Discrimination of liver cirrhosis from chronic hepatitis by analysis of serum cholinesterase isozymes using affinity electrophoresis with concanavalin A or wheat germ agglutinin.

Isozymic alteration of serum cholinesterase (ChE) was investigated in patients with chronic liver diseases using affinity electrophoresis with concanavalin A (Con A) or wheat germ agglutinin (WGA). On Con A-containing agarose gel electrophoresis, three bands with enzyme activity (named bands I to III, from the anodic side to the cathodic) were observed in sera of normal controls. Disappearance of band II was observed in 50% (15/30) of cirrhotic patients, but only one of 20 patients with chronic hepatitis lacked band II of the serum ChE isozymes. Meanwhile, WGA-containing agarose gel electrophoresis revealed that normal controls had four ChE isozymes (named bands I to IV from the anodic side to the cathodic). These four isozymes were also observed in patients with chronic hepatitis. However approximately 67% (20/30) of cirrhotic patients lacked band II of ChE isozymes. When these two affinity electrophoreses were used in combination, 22 (73%) of 30 cirrhotic patients had isozymic alteration of their serum ChE on either Con A-containing or WGA-containing agarose gel electrophoresis, or both. Thus, affinity electrophoreses with Con A and WGA seemed to be useful methods in differentiating liver cirrhosis from chronic hepatitis.

Cholinesterases↗
PubMed1990

A case of multiple cavernous hemangioma of the small intestine and clinical review of the Japanese literature.

We report a case of multiple cavernous hemangioma of the small intestine which was diagnosed definitively before operation. A 33-yr-old male was found to have multiple polypoid lesions in the small intestine during examination for recurrent iron deficiency anemia. Plain X-ray film of the abdomen revealed multiple calcifications in the middle to lower region, suggestive of cavernous hemangioma, which was further confirmed by angiography and scintigraphy with Tc 99m-labeled red blood cells. Endoscopy during surgery was used to determine the extent of surgical resection. Seventy-three cases of hemangioma of the small intestine were reported in Japan between 1953 and 1988 and their clinical features were reviewed.

Adult↗