[A case of intractable intrahepatic cholestasis treated with coenzyme Q10 (ubidecarenone)].
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Aged↗
Biomedical subjects
C Kato
Publications and source records attributed to C Kato.
[Interrelationship between disease activity and nutrient intake or serum cytokine in patients with rheumatoid arthritis].
OBJECTIVE: This study was designed to investigate the possibility of nutrition guidance for patients with rheumatoid arthritis (RA). We studied interrelationship between disease activity and nutrient intake or serum cytokine concentration in patients with RA. METHODS: Dietary survey was performed to assess nutrient intake of RA patients. Disease activity parameters, such as weariness index, arthritically index and QOL index were evaluated by self-questionnaire. CRP and serum cytokine concentrations were measured. Interactions between these parameters and nutrient intake were analyzed. RESULTS: In comparison of nutrient intake between patients with RA and healthy controls, RA patients indicated lower ratio of polyunsaturated to saturated fatty acid (P/S) than controls. Preceding with the analysis between disease activity parameter and nutrient intake, RA patients were divided into two groups according to their activities. High weariness group indicated higher lipid intake and energy supplies from fat than low group, suggesting the relationship between disease activity and lipid intake in RA patients. From the comparative study of serum cytokine concentration between patients with RA and healthy controls, RA patients indicated higher concentration of IL-1 beta, IL-6 and IL-8. Serum concentrations of these proinflammatory cytokines correlated significantly with some nutrient intakes. CONCLUSION: These results imply the relationship between nutrient intake and disease activity in patients with RA. It is important to develop nutrition guidance to improve symptoms for patients with RA.
Arthritis, Rheumatoid↗
Involvement of motor cortices in retrieval of kanji studied by functional MRI.
Functional magnetic resonance imaging was successfully used to study the activation of the motor cortices during retrieval of Japanese ideogram, kanji. The subjects performed kanji completion tasks to generate a kanji in response to an element which is always written first. In most of the subjects, the contralateral premotor cortex, the presupplementary motor area (pre-SMA) and the bilateral intraparietal sulcus were activated during retrieval of kanji without actual writing nor intentional mental writing. Activation associated with actual writing was shown in the contralateral primary sensorimotor cortex and the SMA proper. These results suggested that retrieval of kanji would share the neural basis of motor representation with writing of kanji except for regions directly working for motor output.
Adult↗
A functional magnetic resonance imaging study of listening comprehension of languages in human at 3 tesla-comprehension level and activation of the language areas.
Passive listening comprehension of native and non-native language was investigated using high resolution functional magnetic resonance imaging (fMRI) at a static magnetic field strength of 3 tesla. Wernicke's area was activated by comprehensive and non-comprehensive languages indicating that this area is associated with common phonological processing of language. The task with comprehensive but non-native language activated Broca's area and angular gyrus most frequently. The activations in these areas may be related to demand in semantic and syntactic processing in listening comprehension. Supplementary motor area and pre-motor area were activated by comprehensive languages but not by non-comprehensive language. These motor controlling areas may be involved in semantic processing. Listening to comprehensive but non-native language seems to demand more networked co-processing.
Adult↗
Changes in the microbial community in Japan Trench sediment from a depth of 6292 m during cultivation without decompression.
A sample of deep-sea sediment was obtained from the Japan Trench at a depth of 6292 m using a pressure-retaining sediment sampler. Microorganisms in the sediment sample were cultivated in marine broth 2216 at ambient pressure (65 MPa) without decompression, and at atmospheric pressure (0.1 MPa) as a control experiment. 16S ribosomal RNA genes (rDNA) were amplified by PCR from DNA extracted from the original sediment sample and the mixed cultures, and the nucleotide sequences were determined. The results of phylogenetic analysis based on 16S rDNA sequences indicated that microbial diversity in the original sediment samples showed a wide distribution of types in the domain Bacteria. Furthermore, in the mixed cultures incubated at 65 MPa without decompression, bacterial strains belonging to the Shewanella barophiles branch and the genus Moritella existed together at the beginning of cultivation, and Moritella strains became dominant towards the end of the cultivation period. Finally, in the mixed cultures incubated at atmospheric pressure, strains belonging to the genus Pseudomonas were dominant at all times. Analysis of fatty acids extracted from the cultures supported the phylogenetic results.
Atmospheric Pressure↗
Microbial Diversity in Sediments Collected from the Deepest Cold-Seep Area, the Japan Trench.
: The Japan Trench land slope at a depth of 6,400 m is the deepest cold-seep environment with Calyptogena communities. Sediment samples from inside and beside the Calyptogena communities were collected, and the microbial diversity in the sediment samples was studied by molecular phylogenetic techniques. From DNA extracted directly from the sediment samples, 16S rDNAs were amplified by the polymerase chain reaction method. The sequences of the amplified 16S rDNAs selected by restriction fragment length polymorphism analysis were determined and compared with sequences in DNA databases. The results showed that 33 different bacterial 16S rDNA sequences from the two samples analyzed fell into similar phylogenetic categories, the alpha-, gamma-, delta-, and varepsilon-subdivisions of Proteobacteria, Cytophaga, and gram-positive bacteria; some of the 16S rDNA sequences were common to both samples. delta- and varepsilon-Proteobacteria-related sequences were abundant in both sediments. These sequences are mostly related to sulfate-reducing or sulfur-reducing bacteria and epibionts, respectively. Eight different archaeal 16S rDNA sequences were cloned from the sediments. The majority of the archaeal 16S rDNA sequences clustered in Crenarchaeota and showed high similarities to marine group I archaeal rDNA. A Methanococcoides burtonii-related sequence obtained from the sediment clustered in the Euryarchaeota indicating that M. burtonii-related strains in the area of Calyptogena communities may contribute to production of methane in this environment. From these results, we propose a possible model of sulfur circulation within the microbial community and that of Calyptogena clams in the cold-seep environment.
Journal Article↗
Isolation of multicopy suppressors of the calcium sensitivity of a mutant lacking the bZIP transcription factor Atf1 in fission yeast.
In Schizosaccharomyces pombe, recent studies have uncovered a set of putative transcription factors of the basic leucine zipper (bZIP) type (e.g., Atf1, Pcr1, Pap1), which function downstream of the Sty1 mitogen-activated protein kinase (MAPK) cascade which is involved in stress-activated signal transduction. Accordingly, a delta atf1 mutant is known to exhibit osmosensitivity for growth, since one of the targets of Atf1 is the gpd1+ gene, which is responsible for the osmoadaptive glycerol production mediated by the Sty1 MAPK cascade. During the course of our studies on the osmotic response in S. pombe, we found that growth of a delta atf1 mutant is highly sensitive to the level of Ca2+ ions in the medium (but less sensitive to Mg2+ and Na+ ions). This phenotype seemed to be relevant to the osmosensitivity, because an delta gpd1 mutant showed a similar phenotype. An attempt was therefore made to isolate multicopy suppressors of the calcium sensitivity exhibited by the delta atf1 cells. Among such suppressors were several bZIP factors, including two known proteins (Atf21 and Pcr1), and two new ones (named Atf31 and Zip1). These factors were characterized further, in comparison to Atf1, with special reference to the Sty1 MAPK signaling pathway.
Activating Transcription Factor 1↗
Thermococcus siculi sp. nov., a novel hyperthermophilic archaeon isolated from a deep-sea hydrothermal vent at the Mid-Okinawa Trough.
A novel coccoid-shaped, hyperthermophilic, anaerobic archaeon, strain RG-20, was isolated from a deep-sea hydrothermal vent fluid sample taken at 1394-m depth at the Mid-Okinawa Trough (27 degrees 32.7'N, 126 degrees 58.5'E). Cells of this isolate occur singly or in pairs and are about 0.8 to 2 microm in diameter. Growth was observed at temperatures between 50 degrees and 93 degrees C, with an optimum at 85 degrees C. The pH range for growth is 5.0-9.0, with an optimum around 7.0. Strain RG-20 requires 1%-4% of NaCl for growth, and cell lysis occurs at concentrations below 1%. The newly isolated strain grows preferentially in the presence of elemental sulfur on proteinaceous substrates such as yeast extract, peptone, or tryptone, and no growth was observed on carbohydrates, carboxylic acids, alcohols, or lipids. This microorganism is resistant to streptomycin, chloramphenicol, ampicillin, and kanamycin at concentrations up to 150 microg/ ml, but is susceptible to rifampicin. Analysis of the hydrolyzed core lipids by thin-layer chromatography (TLC) revealed the presence of archaeol and caldarchaeol. The mol% G+C content of the DNA is 55.8. Partial sequencing of the 16S rDNA indicates that strain RG-20 belongs to the genus Thermococcus. Considering these data and on the basis of the results from DNA-DNA hybridization studies, we propose that this strain should be classified as a new species named Thermococcus siculi (si'cu.li. L. gen. n. siculi, of the deep-sea [siculum, deep-sea in literature of Ovid], referring to the location of the sample site, a deep-sea hydrothermal vent). The type strain is isolate RG-20 (DSM No. 12349).
DNA, Archaeal↗
Taxonomic studies of extremely barophilic bacteria isolated from the Mariana Trench and description of Moritella yayanosii sp. nov., a new barophilic bacterial isolate.
We have isolated two strains of extremely barophilic bacteria from sediment collected from the world's deepest ocean floor in the Mariana Trench, Challenger Deep, at a depth of 10898m [Kato C, Li L, Nogi Y, Nakamura Y, Tamaoka J, Horikoshi K (1998) Appl Environ Microbiol 64:1510-1513]. One strain, DB21MT-2, was identified as a strain of Shewanella benthica, and the other strain, DB21MT-5, is closely affiliated with members of the genus Moritella on the basis of 16S rDNA sequence analysis. The hybridization values for DNA-DNA relatedness between DB21MT-5 and the Moritella reference strains were significantly lower than that accepted as the phylogenetic definition of a species. Based on this and other taxonomic differences, strain DB21MT-5 appears to represent a novel obligately barophilic deep-sea Moritella species. The name Moritella yaynanosii (JCM 10263) is proposed. This is the first proposed species of obligately barophilic bacteria of the genus Moritella.
Bacteria↗
Novel archaeal phylotypes from an East African alkaline saltern.
DNA has been extracted on site from the brines of the final crystallizing pond of an alkaline saltern at Lake Magadi, Kenya. Amplification of 16S rRNA genes followed by cloning, sequencing, and phylogenetic analysis has revealed the presence of two distinct new archaeal lineages. The majority of cloned sequences showed greater than 95% identity to each other, but only 88%-90% similarity to any cultivated haloalkaliphilic Archaea, and form a distinct cluster within the known Haloarchaea. Two cloned genes showed close similarity to each other but only 76% similarity to any known archaeal sequence, and therefore represent a distinct phylotype only distantly related to the euryarchaeotal branch of the Archaea.
Africa, Eastern↗
The influence of initial exposure timing to beta-lactoglobulin on oral tolerance induction.
BACKGROUND: Although a number of studies have investigated the induction of oral tolerance to several proteins, relatively little is known about the induction of oral tolerance to beta-lactoglobulin, one of the major antigenic proteins in milk. OBJECTIVE: We investigated the influence of the timing of the initial beta-lactoglobulin exposure on oral tolerance induction and examined some characteristics of the tolerogenic immune response. METHODS: BALB/c mice were given beta-lactoglobulin prenatally or from the third or fifth postnatal week, bred for 17 weeks, and compared with unexposed control mice. Specific plasma anti-beta-lactoglobulin antibodies (total IgG, IgG subclasses, IgM, and IgE), antigen-specific splenocyte responses, frequencies of antibody-producing cells, and cytokine production by splenocytes, intestinal mucosal lymphocytes, and Peyer's patches were analyzed. RESULTS: Differences were observed among the 4 groups of mice in changes of plasma anti-beta-lactoglobulin antibody titers, antigen-specific T-cell proliferation, and frequencies of antibody-producing splenocytes, intestinal mucosal lymphocytes, and Peyer's patch cells after the first exposure to beta-lactoglobulin. The onset and duration of the immunologic responses were found to be dependent on the timing of antigen exposure. Prenatal exposure to antigen facilitated the induction of oral tolerance to beta-lactoglobulin, whereas delayed antigen exposure retarded tolerance. The induction of oral tolerance was associated with increased IL-4 and/or IL-10 production and decreased IL-12 production. CONCLUSION: Our results suggest that the timing of initial antigen exposure greatly influences the induction of oral tolerance to beta-lactoglobulin and that altered secretion of regulatory cytokines may be responsible for the differences in antibody production and oral tolerance induction.
Administration, Oral↗
Pressure-regulated metabolism in microorganisms.
There has been a renewal of interest in the survival strategies employed by deep-sea, high-pressure-adapted (piezophilic) microorganisms as well as in the effects of high pressure on mesophilic, 1-atmosphere-pressure-adapted microorganisms. This is partly the result of a greater appreciation of the adaptations of microorganisms to life in extreme environments and partly the result of the development of new techniques for examining physiological and molecular processes as a function of pressure.
Bacteria↗
A fission yeast gene (prr1(+)) that encodes a response regulator implicated in oxidative stress response.
An inspection of the Schizosaccharomyces pombe genome database revealed that this eukaryotic microorganism possesses a gene that may encode a bacterial type of histidine-to-aspartate (His-Asp) phosphorelay component, namely, a response regulator. The predicted gene, named prr1(+) (S. pombe response regulator), encodes a protein that contains a typical phospho-accepting receiver domain, preceded by a mammalian heat shock factor (HSF)-like DNA-binding domain. Inactivation of this prr1(+) gene resulted in mutant cells defective in some aspects of stress responses, including sensitivity to oxidative stress, cold-temperature, and heavy metal toxicity. It was also demonstrated that Prr1 is required for the transcription of some genes (e.g., trr1(+), ctt1(+)), which are induced by oxidative stress. These results suggest that a His-Asp phosphorelay system may be involved in a stress-activated signaling pathway in S. pombe.
Aspartic Acid↗
[The 13C-urea breath test efficacy in determining Helicobacter pylori eradication].
Helicobacter pylori eradication therapy is useful and requires more precise determination of actual eradication. Patients often become positive for Helicobacter pylori again after presumed eradication. Reinfection is thought rare and patients with positive reconversion may be false-negative at determination. After a year, positive reconversion was 26.8% in our work after determination by culture and histopathological methods and 4.3% after these were combined with urea breath test (UBT). The positive reconversion rate is significantly lower after combination with UBT, suggesting the usefulness of UBT in determining Helicobacter pylori eradication. This may be because UBT includes no biopsy, eliminating sampling error, and highly sensitive UBT detects traces of Helicobacter pylori. The UBT is thus expected to become widely used to determine Helicobacter pylori eradication.
Breath Tests↗
[Study of chronic graft-vs-host disease, infection and immune reconstitution in patients surviving more than one year after bone marrow transplantation from unrelated donors].
We studied the immune reconstitution and incidence of chronic graft-vs-host disease (GVHD) and infection in 25 patients who survived more than 1 year after bone marrow transplantation (BMT) from unrelated donors for treatment of leukemia. Of the 25 patients, 4 died after 1 year post-transplantation. The causes of death were relapse of leukemia (2 patients), obstructive bronchiolitis (1 patient), and hepatic failure (1 patient). Only 2 of 14 patients who were under 30 years of age at the time of their BMT developed chronic GVHD, however, 7 of 11 patients 30 years of age or older developed chronic GVHD. Lower karnofsky scores were displayed by 6 of the older patients with chronic GVHD but by none of the younger patients with chronic GVHD. These results underscored the importance of care for older patients with chronic GVHD.CD4-positive T cells, and especially CD4 * CD45RA-positive T cells, had not recovered to a normal range even 2 years after BMT. Longer follow-up will be necessary.
Adolescent↗
Early treatment of CMV antigenemia with ganciclovir for prevention of fatal CMV disease in patients receiving marrow from HLA-matched unrelated donors.
The effect of early treatment of cytomegalovirus (CMV) antigenemia with ganciclovir (DHPG) for the prevention of CMV disease was evaluated in 25 patients with hematological malignancy who had received marrow from human leukocyte antigen-matched unrelated donors at our institution. CMV antigenemia occurred in 17 of 25 patients, a high rate of 68%, and was initially detected between 4 and 8 weeks after bone marrow transplantation (BMT) (median time 5 weeks). The incidence of CMV antigenemia was statistically higher in those patients given steroids or antithymocyte globulin (P < 0.01). All 17 CMV antigenemia-positive patients were treated with DHPG until antigenemia was cleared, and this treatment was resumed if antigenemia occurred. CMV antigenemia eventually became negative in all cases. One major drawback of DHPG was that leukopenia was observed in six patients (35%). CMV disease occurred in six patients despite early treatment of CMV antigenemia with DHPG (24%, 6 of 25 patients). Four of them developed CMV disease in the early phase (within six months) and two in the late phase (more than six months). All CMV diseases in the early phase were easily cured by treatment with DHPG while monitoring CMV antigenemia, but CMV disease in the late phase did not respond to DHPG and led to the death of one patient. On the other hand, there were no patients who developed CMV disease in the antigenemia-negative group. Thus, although early treatment using our method was effective in clearing CMV antigenemia in unrelated BMT, it did not totally prevent CMV disease. A further method of early treatment for the prevention of fatal CMV disease is required.
Adolescent↗
[Arterial infusion therapy with implantable port for inoperable hepatobiliary tumors].
PURPOSE: To assess the clinical utility of arterial infusion therapy with implantable port for inoperable malignant hepatobiliary tumors. MATERIALS AND METHODS: Twenty-seven patients with advanced hepatobiliary tumors (M:F = 14:13, mean age 63.6, 11 cases with metastases from colon cancer, 4 cases from gastric cancer, 5 cases with gallbladder cancer, 3 cases with cholangiocarcinoma, 2 cases with cholangiocellularcarcinoma, 1 case with hepatocellular carcinoma and 1 with pancreatic cancer) were treated with arterial infusion ports which were placed via left subclavian artery or femoral artery. The regimens used were FEM for 5 cases, EEP for 2 cases and FP for 20 cases. RESULTS: Overall mean survival date was 241.8 days. The numbers of cases with CR, PR, NC and PD were 1, 6, 10 and 10, respectively, and the effective rate was 25.9%. Mean survivals of cases with cholangiocellularcarcinoma, metastases from gastric cancer and colon cancer were 715 days, 324.3 days and 245.9 days, respectively. Severe gastrointestinal side effects (> grade 3) were not observed. Serious bone marrow suppressions were frequently observed with FEM and EEP, but were rare with FP (10%). DISCUSSION: Arterial infusion therapy with implantable port is clinically useful for advanced cholangiocancer and metastases from the gastrointestinal system. This system contributes to the quality of life of patients, since the infusion procedure is simple and can be archived in the outpatient clinics.
Adult↗
A new marrow T cell depletion method using anti-CD6 monoclonal antibody-conjugated magnetic beads and its clinical application for prevention of acute graft-vs.-host disease in allogeneic bone marrow transplantation: results of a phase I-II trial.
We established a simple method of T cell depletion using anti-CD6 monoclonal antibody-conjugated immunomagnetic beads. Preliminary experiments using this method demonstrated that CD3+ T cells could be partially depleted without depleting CD56+ NK cells. A phase I-II clinical study was performed to assess the safety and efficacy of this partial T cell depletion method for the prevention of acute graft-vs.-host disease (GVHD) in 10 leukemia patients at high risk for GVHD (defined as 1) unrelated transplant from MLC-positive or HLA-DRB1 mismatched donor or 2) related transplant from serologically HLA-A, -B, or -DR one-locus mismatched donor). Cyclosporine (CSP) and methotrexate (MTX) were used for additional prophylaxis against GVHD in all cases. Sustained engraftment occurred in 9 of the 10 patients. Although acute GVHD developed in 6 of the 9 evaluable patients, none developed more than grade III severe acute GVHD. Five patients were alive in remission at a median follow-up of 32 months after bone marrow transplantation, and no relapse of leukemia was observed. We conclude from this pilot study that selective T cell depletion with anti-CD6 monoclonal antibody coupled with CSP and MTX posttransplant immunosuppressive therapy is safe. Further analysis of the phase II-III study is needed to confirm the effectiveness of this protocol.
Acute Disease↗