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Biomedical subjects

S Matsuda

Publications and source records attributed to S Matsuda.

At least 325 records · Page 18Linked to original sources
PubMed1996

[Comparative studies on activities of antimicrobial agents against causative organisms isolated from patients with urinary tract infections (1994). II. Background of patients].

Clinical background was investigated on 628 bacterial strains isolated from patients with urinary tract infections (UTIs) in 10 hospitals during period from June, 1994 to May, 1995. 1. Distributions of sex, age and urinary tract infections Among over sixties males, the majority was taken by complicated urinary tract infections. Among females, the uncomplicated urinary tract infections was most frequent without a relation of age. As for over 40 females, the increase of complicated UTI was admitted. 2. Distribution of sex, age and pathogens isolated from UTIs In uncomplicated UTIs, Escherichia coli was most frequently isolated without a relation of age, and next Enterococcus faecalis and CNS. In complicated UTIs without indwelling catheter, E. coli, Pseudomonas aeruginosa and E. faecalis were isolated the most frequent. In complicated UTIs with indwelling catheter, P. aeruginosa was most frequently isolated, and next E. faecalis and Staphylococcus aureus. 3. Administration of antimicrobial agents and pathogens isolated from UTIs In uncomplicated UTIs, pathogens, after administration of antibiotics, isolated from patients have obviously decreased from 216 to 32 isolates. And also, pathogens of complicated UTIs without indwelling catheter, have decreased from 127 to 50 isolates. However, in complicated UTIs with indwelling catheter, pathogens after or before administration of antibiotics, were not revealed an obvious change. 4. Pathogens and UTIs with or without factor and operation In uncomplicated UTIs with or without factor and operation, E. coli was mainly detected. In complicated UTIs without indwelling catheter and with factor and operation E. faecalis was mainly detected, and next E. coli, S. aureus and P. aeruginosa. Without factor and operation, E. coli was mainly detected. In complicated UTIs with indwelling catheter and with factor and operation, P. aeruginosa, E. faecalis and S. aureus were mainly detected at 23.5%, 15.0%, 15.0%, respectively. Without factor and operation, Proteus spp. 22%, and next E. faecalis and P. aeruginosa 10% and 12%, were detected, respectively. The distribution of pathogens, in the case of Proteus spp. and P. aeruginosa has been obviously varied by the influence of factor and operation.

Adolescent↗
PubMed1996

[Comparative studies on activities of antimicrobial agents against causative organisms isolated from patients with urinary tract infections (1994). III. Secular changes in susceptibility].

Susceptibilities of Enterococcus faecalis, Staphylococcus aureus, Citrobacter spp., Enterobacter spp., Escherichia coli, Klebsiella spp., Proteus mirabilis, Pseudomonas aeruginosa and Serratia spp. isolated from patients with urinary tract infections (UTIs) in 10 hospitals during June 1994 to May 1995 to various antimicrobial agents were compared with those in the same period of previous years according to a classification, uncomplicated UTIs, complicated UTIs without indwelling catheter, and complicated UTIs with indwelling catheter. No remarkable changes were found in susceptibilities of Citrobacter spp., Enterobacter spp. and Serratia spp. The susceptibilities of E. faecalis to amikacin and quinolones were better than those in 1993. As for S. aureus, susceptible strains to all drugs increased in uncomplicated UTIs. Against E. coli in 1993, the antimicrobial activities of piperacillin, cefotiam and aminoglycosides have decreased, however, in 1994, these activities have turned to the better state. As for Klebsiella spp. susceptible strains to ABPC decreased. The susceptibilities of P. mirabilis to all drugs except minocycline were good. Against P. aeruginosa in 1993, the activities of aminoglycosides have decreased, but, in 1994, these activities have turned to the better state. These data should be considered in clinical treatment of various urinary tract infections.

4-Quinolones↗
PubMed1996

[A study of relation between pulmonary function and bronchial hypersensitivity in severe asthmatic children].

We studied 198 acetylcholine inhalation tests in 31 subjects and 260 exercise loading tests in 43 subjects, who were severe asthmatic children received institutional therapy. Respiratory threshold to acetylcholine (RT-Ach) were significantly lower when %V50 or %MMF were less than 60%. %V50 were significantly lower when EIB (maximum %fall in FEV1.0 after exercise) were more than 15%. These results suggest that in bronchial hypersensitivity tests, %V50 and %MMF which are indexes of peripheral airway obstruction should be examined.

Acetylcholine↗
PubMed1996

Role of ICAM-1 and LFA-1 in endotoxin-induced uveitis in mice.

The effect of monoclonal antibodies against adhesion molecules on the development of endotoxin-induced uveitis (EIU) and interleukin-1 (IL-1)-enhanced EIU were studied. When endotoxin or IL-1 was injected into C3H/HeN mice, the expression of intercellular adhesion molecule-1 (ICAM-1) on the ciliary body was up-regulated as determined by immunohistochemical assay. However, these agents did not alter lymphocyte function-associated antigen-1 (LFA-1) expression on leukocytes when whole blood cells were analyzed with flow cytometry. Monoclonal anti-ICAM-1 antibody or anti-LFA-1 antibody was intraperitoneally administered to C3H/HeN mice simultaneously with endotoxin, and the effect on the development of EIU was studied. The cell number in aqueous humor and frequency of posterior synechiae were markedly decreased in EIU when either antibody was administered. However, protein concentration in the aqueous humor was not statistically reduced by the injection of these antibodies. In the model of IL-1 enhanced EIU, not only the cell number and frequency of posterior synechiae but also protein concentration were decreased. Moreover, there were no differences between these two antibodies in the effect on EIU, whereas anti-LFA-1 antibody was more effective than anti-ICAM-1 antibody in IL-1-enhanced EIU.

Animals↗
PubMed1996

Persistent c-fos expression in the brains of mice with chronic social stress.

The present study was conducted to demonstrate immunohistochemically, the sites of c-fos protein expression in the brains of mice subjected to acute and chronic social defeat stress. To induce social stress, mice were placed in situations of species-specific intermale aggression either only once or five times at 24 h intervals. Two hours after the single or fifth defeat stress, many c-fos immunoreactive neurons were observed in a variety of brain regions including the limbic system and sensory relay nuclei. The c-fos immunoreactive neurons in the brains of acute defeat mice decreased in number with time and the c-fos staining pattern of acute defeat mice became indistinguishable from that of normal control mice by 24 h after the single defeat stress. In contrast, chronic defeat stress induced persistent c-fos expression in the forebrain and brainstem even 24 h after the fifth defeat stress. In the forebrain of chronic defeat mice, the olfactory bulb, cingulate cortex, hippocampus, entire hypothalamus, septal nuclei and the amygdaloid complex, except for the central nucleus, were labeled intensely with c-fos antiserum. In the lower brainstem, nerve cells with c-fos immunoreactivity were seen mainly in ascending and descending sensory relay nuclei relevant to auditory and vestibular transmission, epicritic sensation (gracile and external cuneate nuclei), pain inhibition (central gray and raphe nuclei), and viscerosensory transmission (solitary tract nucleus). The differences in c-fos expression among the normal control, acute and chronic defeat mice were evaluated by an enumeration of the immunopositive neurons within each brain nucleus examined, and they were confirmed subsequently by statistical analysis. There was little c-fos expression in the nucleus putamen, lateral, ventral and posterior thalamic nuclei, pretectal nuclei, medial geniculate nucleus, red nucleus, substantia nigra, cerebellum, spinal cord, or cranial nerve nuclei. These findings suggest that chronic but not acute defeat stress causes persistent c-fos expression in more widespread brain regions than do any other stresses so far investigated. The present study may shed light on the central mechanisms by which behavioral abnormalities and/or chronic sociopsychological stress leads to the occurrence of abnormal behavior and/or psychosomatic disorders in experimental animals and humans.

Animals↗
PubMed1995

[An AHP analysis on factors associated with the career choice of medical students of UOEH].

In order to clarify factors associated with the career choice of medical students of UOEH, an AHP (Analytic Hierarchy Process) analysis was employed for 4th year medical students in 1994 (86 students). As factors associated with career choice, the following three factors were evaluated as important in the following order; 'work worth engaging in', 'income', and 'identity as a medical doctor'. For these three major factors, the surgeon was evaluated as the most favorable, followed by the physician, the clinician of other sectors (ORL, ophthalmology, etc), the occupational physician, researcher, and medical doctors in the administration. When comparing students who wanted to be clinicians and those who wanted to be occupational physicians, the latter group attached more importance to 'stability' and 'scholarship'. Finally, the present AHP analyses clarified that students prefer to become clinicians regardless of their expressed preference for a future career. This fact has created for us an educational problem to be discussed in future curriculum meetings of UOEH.

Adult↗
PubMed1995

Role of basic fibroblast growth factor in the regulation of rat basilar artery tone in vivo.

Using the cranial window method, we investigated the effect of basic fibroblast growth factor (bFGF) on the diameter of the rat basilar artery in vivo. bFGF (5-200 ng/ml) caused significant vasodilation in a dose-dependent manner with the maximal effect (119% of baseline diameter) at 200 ng/ml. Vasodilation was not observed when the basilar artery was treated with heat-inactivated bFGF or bFGF preincubated with bFGF-neutralizing monoclonal antibody. Moreover, bFGF-induced vasodilation was suppressed significantly by coadministration of the nitric oxide (NO) synthase inhibitor, NG-nitro-L-arginine methyl ester (L-NAME). In contrast, NG-nitro-D-arginine methyl ester (D-NAME), which is the isomer of L-NAME, exerted no influence on bFGF-induced vasodilation. These findings suggest that the dilatation by bFGF of the rat basilar artery is mediated by NO, and that bFGF plays an important role in the regulation not only of the anterior circulation as previously described but also of the posterior circulation in the brain.

Animals↗
PubMed1995

The association of the platelet count and the peripheral CD8+ cell count in Japanese HIV-infected hemophiliacs.

To determine the factors involved in the pathogenesis of thrombocytopenia frequently found in human immuno-deficiency virus (HIV) infection, we studied the clinical and laboratory findings of 35 Japanese HIV-infected hemophiliacs regarding their association with thrombocytopenia. Seventeen HIV-positive patients were thrombocytopenic. They had fewer CD4+ cells and were in more advanced stages of the disease, compared with the 18 patients without thrombocytopenia. We carried out the stepwise regression analysis on 32 patients in the early stage of HIV infection, with the platelet count as the dependent variable, and with the CD8+ cell count, serum cholinesterase, alanine aminotransferase (ALT), CD4+ cell count and white blood cell count as explanatory variables. The CD8+ cell count, serum cholinesterase, and ALT were entered into the regression model as explanatory variables of the platelet count with statistical significance. A positive linear correlation in these 32 patients between the CD8+ cell count and platelet count (r = 0.50, P < 0.01) was noted. We conclude that the decrease of the CD8+ cell count may play a role in the pathogenesis of thrombocytopenia in Japanese hemophiliacs in the early stage of HIV-infection.

Adult↗
PubMed1995

Evidence for multiple activators for stress-activated protein kinase/c-Jun amino-terminal kinases. Existence of novel activators.

Stress-activated protein kinases (SAPKs) or c-Jun amino-terminal kinases (JNKs), which belong to a subgroup of the mitogen-activated protein kinase (MAPK) superfamily, are activated in response to a variety of stresses in mammalian cells. An activity to activate a recombinant rat SAPK alpha was detected in extracts obtained from rat fibroblastic 3Y1 cells exposed to hyperosmolar media and was resolved into unadsorbed and adsorbed fractions on Q-Sepharose chromatography. The adsorbed activity was identified as XMEK2/SEK1/MKK4 by using several anti-XMEK2 antibodies. Thus, a 45-kDa protein that was recognized specifically by these anti-XMEK2 antibodies co-eluted with the SAPK alpha activating activity during chromatography on Q-Sepharose and Superose 6, and the activity could be immunoprecipitated by the antibodies from these fractions. The unadsorbed activity, whose level was much greater than that of the adsorbed activity, did not contain XMEK2/SEK1/MKK4 and was also activated in a time-dependent manner by osmotic shock. This activity was further resolved into several peaks during chromatography on heparin-Sepharose and hydroxylapatite. Most of these peaks eluted separately from major peaks of a kinase activity toward p38/MPK2, another subgroup of the MAPK superfamily, whereas the activated XMEK2/SEK1/MKK4 could phosphorylate p38/MPK2 efficiently. These results indicate the existence of multiple activators for SAPK/JNK; one is XMEK2/SEK1/MKK4, and the others are previously undescribed factors.

Amino Acid Sequence↗
PubMed1995

[Analysis of factors associated with medical expenditure for the elderly in Fukuoka].

Based on "the Report of National Health Insurance Plan in Fukuoka", "the Report of Health Services for the Elderly in Fukuoka", and "the Health Statistics of Fukuoka" of 1987 and 1991, factors associated with medical expenditures for the elderly were examined. According to the result of correlation analyses, the general medical examination participation rate under the Health Service Law for the Elderly showed a statistically significant negative correlation with the in-patient medical expenditures as well as the out-patient medical expenditures for the elderly. The analysis concerning the three components of medical expenditure has clarified that this negative correlation is mainly explained by the low utilization of medical services among communities with a high general medical examination participation rate under the Law. This fact suggests that the general medical examination service might have a complementary effect against receiving care in medical facilities. However, there exists a possibility that the negative correlation observed in this study might be explained by the existence of "the third factor" intervening the pathway. In order to clarify the mechanism of relation observed, a micro-level analysis should be required.

Aged↗
PubMed1995

Activation of protein kinase cascades by osmotic shock.

Osmotic shock induces a variety of biochemical and physiological responses in vertebrate cells. By analyzing extracts obtained from rat 3Y1 fibroblastic cells exposed to hyper-osmolar media, we have found that mitogen-activated protein kinases (MAPKs) and stress-activated protein kinases (SAPKs, also known as JNKs) are both activated in response to osmotic shock. MAPKK1 (MEK1) was also activated markedly. Furthermore, Raf-1 and MEKK were activated strikingly by the osmotic shock. Activation of Raf-1 and MEKK in response to osmotic shock was detected also in PC12 cells, in which MEKK activation by the osmotic shock was much stronger than that by epidermal growth factor. Activation of SAPKs in PC12 cells by the osmotic shock was also more marked than that by epidermal growth factor. The activated MEKK phosphorylated not only MAPKKs but also XMEK2, which is distantly related to MAPKK. Recombinant wild-type XMEK2, but not kinase-negative XMEK2, was able to phosphorylate and activate recombinant SAPK alpha in vitro. In addition, this activity of XMEK2 was activated by the activated MEKK. These results suggest that the MAPK cascade consisting of Raf-1, MAPKK, and MAPK and the SAPK cascade consisting of MEKK, XMEK2, and SAPK are both activated in response to osmotic shock. Finally, it was found that XMEK2 is a good substrate for SAPK.

Animals↗
PubMed1995

Ciliary neurotrophic factor prevents ischemia-induced learning disability and neuronal loss in gerbils.

Ciliary neurotrophic factor (CNTF) has been shown to have potent neurotrophic activity on peripheral and central neurons in vitro and in vivo. However, it remains to be determined whether or not CNTF rescues hippocampal CA1 neurons from lethal ischemia and prevents ischemia-induced learning disability. In the present in vivo study, we infused CNTF continuously for 7 days into the lateral ventricle of gerbil starting 2 h before 3-min forebrain ischemia. CNTF infusion prevented the occurrence of ischemia-induced learning disability in a dose-dependent manner as revealed by the step-down passive avoidance task. Subsequent light and electron microscopic examinations showed that pyramidal neurons in the CA1 region of the hippocampus as well as synapses within the strata moleculare, lacunosum/radiatum and oriens of the region were significantly more numerous in gerbils infused with CNTF than in those receiving vehicle infusion. These findings suggest that CNTF has a trophic effect on ischemic hippocampal neurons.

Animals↗
PubMed1995

Effect of dietary NaCl on tyrosine hydroxylase in the superior cervical ganglia of Dahl rats.

To investigate the involvement of peripheral catecholamines in the development of Dahl-Iwai salt-sensitive (DIS/Eis) hypertension, we performed immunohistochemical staining of tyrosine hydroxylase (TH) in the superior cervical ganglia (SCG) of DIS/Eis rats and Dahl-Iwai salt-resistant (DIR/Eis) rats, and in situ hybridization histochemistry for demonstration of TH mRNA localization in the SCG of these rats. DIS/Eis and DIR/Eis rats were fed on a high (8%) salt diet or on a low (0.3%) salt diet for 4 weeks. Nerve cells in the SCG of DIS/Eis high salt rats exhibited more intense TH-immunoreactivity (P < 0.01) and hybridization signals (P < 0.01) than those of the other experimental groups. These findings suggest that activation of peripheral sympathetic nerves may account for hypertension in DIS/Eis rats on a high salt diet.

Animals↗
PubMed1995

Purification and characterization of REKS from Xenopus eggs. Identification of REKS as a Ras-dependent mitogen-activated protein kinase kinase kinase.

We have previously identified a protein factor, named REKS (Ras-dependent Extracellular signal-regulated kinase/Mitogen-activated protein kinase kinase (MEK) Stimulator), which is necessary for Ras-dependent MEK activation. In this study, we attempted to highly purify and characterize REKS. We have highly purified REKS by successive column chromatographies using a cell-free assay system in which REKS activates recombinant extracellular signal-regulated kinase 2 through recombinant MEK in a guanosine 5'-O-(thiotriphosphate) (GTP gamma S)-Ki-Ras-dependent manner. REKS formed a stable complex with GTP gamma S-Ras; REKS was coimmunoprecipitated with GTP gamma S-Ki-Ras or GTP gamma S-Ha-Ras, but not with GDP-Ki-Ras or GDP-Ha-Ras by an anti-Ras antibody. REKS was absorbed to a GTP gamma S-glutathione S-transferase (GST)-Ha-Ras-coupled glutathione-agarose column but not to a GDP-GST-Ha-Ras-coupled glutathione-agarose column and was coeluted with GTP gamma S-GST-Ha-Ras by reduced glutathione. The minimum molecular mass of REKS was estimated to be about 98 kDa on SDS-polyacrylamide gel electrophoresis. REKS phosphorylated this 98-kDa protein as well as recombinant MEK. REKS was not recognized by any of the anti-c-Raf-1, anti-Mos, and anti-mSte11 antibodies. These results indicate that REKS is a Ras-dependent MEK kinase.

Animals↗
PubMed1995

Effects of ALDH2, CYP1A1, and CYP2E1 genetic polymorphisms and smoking and drinking habits on toluene metabolism in humans.

In this study, we evaluated the effects of ALDH2, CYP1A1, and CYP2E1 genetic polymorphisms and smoking and drinking habits on the toluene metabolism. The study subjects were 92 male workers who handle toluene in a printing factory, an electrical parts factory, and a painting workplace in Japan. Their exposure levels to toluene were monitored using the diffusion-type sampler. Benzyl alcohol concentrations in their blood and hippuric acid (HA) and creatinine concentrations in their urine at the end of a workshift were determined. The genotype of ALDH2 was classified into the homozygous genotype of a normal ALDH2 gene (NN), the homozygous genotype of an inactive ALDH2 gene (DD), and the heterozygous genotype of normal and inactive ALDH2 genes (ND). The genetic polymorphism of CYP1A1 and CYP2E1 were also determined by restriction fragment length polymorphism (RFLP). A strong correlation between the personal exposure level and the urinary HA concentration was observed. Regression lines were calculated after being divided by the five factors, i.e., ALDH2, CYP1A1, CYP2E1, smoking, and drinking. The HA formation from toluene was significantly (p < 0.001) different among the genotypes of ALDH2. The slopes of the regression lines decreased from NN to ND to DD in this order. The benzyl alcohol concentration in the blood of the DD group was significantly higher than that found in the NN and ND groups. This result demonstrates that ALDH2 polymorphism affects the oxidation of benzyl alcohol to benzoic acid. The toluene metabolism was also affected by CYP1A1 polymorphism. The slope for the Ile/Ile (the predominant homozygous allele) group was significantly lower than that for the Ile/Val (the heterozygous allele) and Val/Val (the rare homozygous allele) group after correction for creatinine. A drinking habit significantly (p < 0.05) reduced urinary HA concentration in the NN group. A smoking habit also significantly (p < 0.05) reduced urinary uncorrected HA concentration in both the NN and ND groups. In a multiple regression analysis, ALDH2 and the drinking habit were significantly (p < 0.01) associated with HA excretion after toluene exposure with and without correction for creatinine, and the corrected HA concentration was also significantly (p < 0.01) increased in the Ile/Val and Val/Val group of CYP1A1. The smoking habit reduced the corrected HA concentration (p < 0.05); however, the polymorphism in the 5'-flanking region of CYP2E1 did not affect HA appearance in urine.

Adult↗
PubMed1995

Effect of Thrombin Inhibition on Patients with Peripheral Arterial Obstructive Disease: A Multicenter Clinical Trial of Argatroban.

Background: Enhanced thrombin generation has been found in patients with peripheral arterial obstructive disease (PAOD). The objective of this study is to investigate the effect of thrombin inhibition in PAOD patients. Methods: Argatroban (20 mg/day) was infused intravenously over 2 hours for 14-68 days in 27 patients with chronic PAOD of the lower extremities. Plasma thrombin-antithrombin III complex (TAT) levels and clinical signs were assessed. Results: TAT levels before argatroban therapy were significantly higher in the PAOD patients than in age- and gender-matched controls. In the PAOD patients, TAT levels increased stepwise in the presence of rest pain classified as Fontain III and IV. To assess the effect of thrombin inhibition, we divided the patients into a high-TAT group (pretreatment TAT level >/=5 ng/ml, n = 12) and a low-TAT group (pretreatment TAT level <5 ng/ml, n = 15). In the high-TAT group, TAT levels were suppressed in 8 of 12 patients after the administration of argatroban, along with improvement of their clinical symptoms and a decrease in the size of ischemic skin ulcers, indicating that argatroban clearly inhibited thrombin generation in vivo. Even in the low-TAT group, argatroban improved the clinical signs and symptoms, and also reduced the size of ischemic skin ulcers although TAT levels remained within the low range (<5 ng/ml) in 13 of the 15 patients, indicating that PAOD signs and/or symptoms may be related to small amounts of thrombin generated locally at the sites of atherothrombotic stenotic lesion. Conclusions: These results suggest that thrombin generation was enhanced in PAOD and that the amount was related to disease severity. Thrombin inhibition by argatroban may break this vicious cycle and lead to clinical improvement in PAOD.

Journal Article↗
PubMed1995

Full-thickness skin grafting of postsurgical oral defects: short- and long-term outcomes.

PURPOSE: This study evaluated the use of full-thickness skin grafts (FTSGs) following excision of precancerous and cancerous oral lesions. MATERIALS AND METHODS: Fourteen oral lesions, including five leukoplakias, one carcinoma in situ, two verrucous carcinomas, and six squamous cell carcinomas with varying grade of keratinization and invasion were skin grafted after excision. The size of the graft ranged from 16 x 22 mm to 40 x 50 mm, and the fixation period was 8 to 13 days. The grafts were evaluated for necrosis as a short-term result and shrinkage and recurrence of the lesion as long-term results. RESULTS: Three cases with more than moderate necrosis of the grafted skin were observed (21.4%). Shrinkage was observed in 23% of the 14 skin grafts and tumor recurrence was observed in three FTSGs (2 patients). CONCLUSIONS: The results suggest that the paucity of the blood supply in the grafted bed, and the uneven pressure and immobilization of the grafted skin, influence the success of the procedure, and that proper case selection is necessary.

Aged↗