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1.
Intern Med ; 2024 Jan 13.
Article in English | MEDLINE | ID: mdl-38220190

ABSTRACT

Roseomonas mucosa is difficult to identify using routine analytical techniques. We herein report a case of peritoneal dialysis (PD)-related peritonitis caused by R. mucosa identified using matrix-assisted laser desorption/ionization-time-of-flight (MALDI-TOF) mass spectrometry (MS). A 70-year-old woman was admitted to our hospital with PD-related peritonitis. Blood agar medium of dialysate culture derived colony pale pink in color, and the organism was identified as R. mucosa using MALDI-TOF MS. She was successfully treated with ciprofloxacin and meropenem without catheter removal. To our knowledge, this is the first case of R. mucosa peritonitis in which technique failure has been avoided.

2.
Trials ; 24(1): 161, 2023 Mar 03.
Article in English | MEDLINE | ID: mdl-36869356

ABSTRACT

BACKGROUND: Administration of Janus kinase (JAK) inhibitors and biological disease-modifying antirheumatic drugs has dramatically improved even the clinical outcomes in patients with rheumatoid arthritis (RA) and an inadequate response to methotrexate (MTX). Dysregulation of JAK-STAT pathways via overproduction of cytokines, such as interleukin-6, is involved in the pathogenesis of RA. Filgotinib is a selective JAK1 inhibitor pending approval for use in RA. By inhibition of the JAK-STAT pathway, filgotinib is effective in suppressing disease activity and preventing the progression of joint destruction. Similarly, interleukin-6 inhibitors such as tocilizumab also inhibit the JAK-STAT pathways by inhibition of interleukin-6 signaling. We present the protocol for a study that will evaluate whether the effectiveness of filgotinib monotherapy is non-inferior to that of tocilizumab monotherapy in RA patients with an inadequate response to MTX. METHODS: This study is an interventional, multicenter, randomized, open-label, parallel-group, and non-inferiority clinical trial with a 52-week follow-up. Study participants will be 400 RA patients with at least moderate disease activity during treatment with MTX. Participants will be randomized in a 1:1 ratio to administer filgotinib monotherapy or subcutaneous tocilizumab monotherapy switched from MTX. We will evaluate disease activity by measuring clinical disease activity indices and by using musculoskeletal ultrasound (MSUS). The primary endpoint is the proportion of patients who achieve an American College of Rheumatology 50 response at week 12. Secondary endpoints are changes from baseline in the MSUS scores. We will also comprehensively analyze serum levels of multiple biomarkers, such as cytokines and chemokines. DISCUSSION: The study results are expected to show the non-inferiority of the effectiveness of filgotinib monotherapy to that of tocilizumab monotherapy in RA patients with inadequate response to MTX. The strength of this study is its prospective evaluation of therapeutic efficacy using not only clinical disease activity indices, but also MSUS, which accurately and objectively evaluates disease activity at the joint level among patients drawn from multiple centers with a standardized evaluation by MSUS. We will evaluate the effectiveness of both drugs by integrating multilateral assessments-clinical disease activity indices, MSUS findings, and serum biomarkers. TRIAL REGISTRATION: Japan Registry of Clinical Trials ( https://jrct.niph.go.jp ) jRCTs071200107. Registered on March 3, 2021. CLINICALTRIALS: gov NCT05090410. Registered on October 22, 2021.


Subject(s)
Arthritis, Rheumatoid , Methotrexate , Humans , Cytokines , Interleukin-6 , Janus Kinases , Multicenter Studies as Topic , Randomized Controlled Trials as Topic , Signal Transduction , STAT Transcription Factors , Equivalence Trials as Topic
3.
Medicine (Baltimore) ; 101(2): e28463, 2022 Jan 14.
Article in English | MEDLINE | ID: mdl-35029189

ABSTRACT

BACKGROUND: The administration of Janus kinase inhibitors as well as biological disease-modifying anti-rheumatic drugs has dramatically improved the clinical outcomes of patients with rheumatoid arthritis (RA). Previous trials have shown that upadacitinib, a Janus kinase inhibitor, can effectively improve disease activity and prevent progression of joint destruction in RA patients with inadequate responses to methotrexate (MTX). It remains unclear whether reduced disease activity can be maintained after discontinuation of MTX in patients treated with upadacitinib plus MTX. Thus, the aim of this study is to evaluate changes in disease activity after administration of upadacitinib plus MTX in RA patients who failed to achieve an adequate response to MTX and to determine whether clinical relapse can be avoided after discontinuation of MTX in those who achieved clinical remission. METHODS/DESIGN: The proposed study is an interventional, multicenter, open-label, single-arm clinical trial with a 48-week follow-up. The cohort will include 155 RA patients with at least moderate disease activity during treatment with MTX. Patients will receive upadacitinib and MTX will be discontinued for those who achieve clinical remission. Disease activity will be evaluated longitudinally by measuring clinical disease activity indices and with musculoskeletal ultrasound (MSUS). The primary endpoint is the proportion of patients who sustain a disease activity score-28- C reactive protein score of ≤3.2 from week 24 to 48 after a disease activity score-28- C reactive protein score of <2.6 at week 24. Important secondary endpoints are changes from baseline MSUS scores. Serum levels of multiple biomarkers, including cytokines and chemokines, will be comprehensively analyzed. DISCUSSION: The study results are expected to show the clinical benefit of the discontinuation of MTX after achieving clinical remission by treatment with upadacitinib plus MTX combination therapy. The strength of this study is the prospective evaluation of therapeutic efficacy using clinical disease activity indices and standardized MSUS, which can accurately and objectively evaluate disease activity at the joint level among patients drawn from multiple centers. Furthermore, parameters to predict clinical remission after administration of upadacitinib plus MTX combination therapy and nonclinical relapse after discontinuation of MTX will be screened by integrated multilateral assessments (i.e., clinical disease activity indices, MSUS findings, and serum biomarkers).


Subject(s)
Antirheumatic Agents , Arthritis, Rheumatoid , Heterocyclic Compounds, 3-Ring/therapeutic use , Janus Kinase Inhibitors , Methotrexate , Remission Induction , Antirheumatic Agents/therapeutic use , Arthritis, Rheumatoid/diagnostic imaging , Arthritis, Rheumatoid/drug therapy , Biomarkers , C-Reactive Protein , Double-Blind Method , Drug Therapy, Combination , Humans , Janus Kinase Inhibitors/therapeutic use , Methotrexate/therapeutic use , Multicenter Studies as Topic , Recurrence , Treatment Outcome
4.
Intern Med ; 59(21): 2679-2685, 2020 Nov 01.
Article in English | MEDLINE | ID: mdl-32669489

ABSTRACT

Objective A low-normal albumin level is associated with a high risk of cardiovascular disease and mortality in the general population. However, the relationship between the serum albumin level and the future decline in the kidney function is unclear. We evaluated the effect of the serum albumin level on the decline in the kidney function in the general population. Methods The data used were from 11,000 participants in a voluntary health checkup program conducted between 1998 and 2006 in Japan. The primary outcome for the kidney function was a difference in the estimated glomerular filtration rate (ΔeGFR) of≥3 mL/min/1.73 m2/year. The association of the risk of a decreased kidney function with the albumin level was determined using a logistic regression analysis. We fit separate multivariable logistic regressions for the serum albumin levels (g/dL) as a continuous variable and as categorical data, classified as ≤4.3 (n=2,530), 4.4-4.6 (n=5,427), and≥4.7 (n=3,043). Results Of the 11,000 participants, 346 had a ΔeGFR/year of≥3. Compared with the participants with albumin levels of≥4.7 g/dL, the risk of a decline in the kidney function was higher not only in those with albumin levels of ≤4.3 g/dL [adjusted odds ratio (OR) =2.10, 95% confidence interval (CI): 1.20-2.93] but also in those with levels of 4.4-4.6 g/dL (adjusted OR=1.53, 95% CI: 1.14-2.05). Conclusion A decreased albumin level is an independent risk factor for a rapid decline in the kidney function, even within the normal range.


Subject(s)
Glomerular Filtration Rate , Predictive Value of Tests , Renal Insufficiency/blood , Renal Insufficiency/diagnosis , Renal Insufficiency/physiopathology , Risk Assessment/methods , Serum Albumin/analysis , Adult , Aged , Cohort Studies , Female , Humans , Japan/epidemiology , Logistic Models , Male , Middle Aged , Odds Ratio , Reference Values , Renal Insufficiency/epidemiology , Retrospective Studies , Risk Factors
5.
Medicine (Baltimore) ; 98(2): e14014, 2019 Jan.
Article in English | MEDLINE | ID: mdl-30633192

ABSTRACT

RATIONALE: Adult-onset hepatitis B virus-associated membranoproliferative glomerulonephritis (HBV-MPGN) is generally refractory, and an effective treatment for this condition has not been established. The indications for steroids in HBV-MPGN are an important clinical concern. PATIENT CONCERNS: A 28-year-old woman with a chronic hepatitis B virus infection developed nephrotic syndrome in her second month of pregnancy, with urinary protein levels of 3 to 10 g/d that continued into her postpartum period. She was a carrier of HBV with HBeAg seroconversion. As her renal impairment could have been a result of pregnancy, we observed her for 10 months postpartum without any intervention. However, spontaneous remission after childbirth was not achieved and urine protein levels were sustained at 1 to 3 g/d. About 10 months after delivery, elevated serum liver enzyme levels were observed. DIAGNOSIS: Biopsies showed MPGN, with deposition of hepatitis B antigen in the glomeruli, and chronic B-type hepatitis with a severity grade of A1F0. She was diagnosed with HBV-MPGN. INTERVENTIONS: The patient was started on entecavir 0.5 mg/d in March 2008. Within 1 month, serum HBV DNA became undetectable; within 3 months, her alanine aminotransferase levels normalized. However, urinary protein excretion did not decrease to <2 g/d. On a second renal biopsy, performed 7 months after entecavir treatment, proliferative lesions of the glomeruli were observed; therefore, prednisolone was started at an initial dose of 30 mg/d. OUTCOMES: Her proteinuria improved immediately and prednisolone was tapered over 10 months. A third renal biopsy showed a remarkable resolution of HBV-MPGN, with a significant decrease in mesangial proliferation and immune complex deposition. HBV reactivation was not observed during the prednisolone treatment. LESSONS: Additional prednisolone therapy in combination with antiviral therapy should be considered for refractory HBV-MPGN, with sufficient care taken regarding HBV reactivation.


Subject(s)
Antiviral Agents/therapeutic use , Glomerulonephritis, Membranoproliferative/drug therapy , Glomerulonephritis, Membranoproliferative/etiology , Guanine/analogs & derivatives , Hepatitis B, Chronic/complications , Hepatitis B, Chronic/drug therapy , Adult , Female , Glomerulonephritis, Membranoproliferative/pathology , Glomerulonephritis, Membranoproliferative/virology , Guanine/therapeutic use , Hepatitis B virus , Hepatitis B, Chronic/pathology , Humans , Prednisolone/therapeutic use , Pregnancy , Pregnancy Complications, Infectious
6.
Radiat Res ; 174(5): 611-7, 2010 Nov.
Article in English | MEDLINE | ID: mdl-20954861

ABSTRACT

Changes in gene expression profiles in mouse liver induced by long-term low-dose-rate γ irradiation were examined by microarray analysis. Three groups of male C57BL/6J mice were exposed to whole-body radiation at dose rates of 17-20 mGy/day, 0.86-1.0 mGy/day or 0.042-0.050 mGy/day for 401-485 days with cumulative doses of approximately 8 Gy, 0.4 Gy or 0.02 Gy, respectively. The gene expression levels in the livers of six animals from each exposure group were compared individually with that of pooled sham-irradiated animals. Some genes revealed a large variation in expression levels among individuals within each group, and the number of genes showing common changes in individuals from each group was limited: 20 and 11 genes showed more than 1.5-fold modulation with 17-20 mGy/day and 0.86-1.0 mGy/day, respectively. Three genes showed more than 1.5-fold modulation even at the lowest dose-rate of 0.04-0.05 mGy/day. Most of these genes were down-regulated. RT-PCR analysis confirmed the expression profiles of the majority of these genes. The results indicate that a few genes are modulated in response to very low-dose-rate irradiation. The functional analysis suggests that these genes may influence many processes, including obesity and tumorigenesis.


Subject(s)
Gamma Rays , Gene Expression Profiling , Liver/metabolism , Liver/radiation effects , Animals , Dose-Response Relationship, Radiation , Male , Mice , Mice, Inbred C57BL , Occupational Exposure/adverse effects , Oligonucleotide Array Sequence Analysis , Reverse Transcriptase Polymerase Chain Reaction , Time Factors
7.
Mol Microbiol ; 62(4): 1064-75, 2006 Nov.
Article in English | MEDLINE | ID: mdl-17038124

ABSTRACT

The LolCDE complex of Escherichia coli belongs to the ABC transporter superfamily and initiates the lipoprotein sorting to the outer membrane by catalysing their release from the inner membrane. LolC and/or LolE, membrane subunits, recognize lipoproteins anchored to the outer surface of the inner membrane, while LolD hydrolyses ATP on its inner surface. We report here that ligand-bound LolCDE can be purified from the inner membrane in the absence of ATP. Liganded LolCDE represents an intermediate of the release reaction and exhibits higher affinity for ATP than the unliganded form. ATP binding to LolD weakens the interaction between LolCDE and lipoproteins and causes their dissociation in a detergent solution, while lipoprotein release from membranes requires ATP hydrolysis. Liganded LolCDE thus reveals molecular events brought about through ATP binding and hydrolysis. LolCDE is the first example of an ABC transporter purified with tightly bound native substrates. A single molecule of lipoprotein is found to bind per molecule of the LolCDE complex.


Subject(s)
ATP-Binding Cassette Transporters/metabolism , Escherichia coli Proteins/metabolism , Escherichia coli/metabolism , Lipoproteins/metabolism , ATP-Binding Cassette Transporters/genetics , ATP-Binding Cassette Transporters/isolation & purification , Adenosine Triphosphate/metabolism , Amino Acid Motifs/genetics , Cell Membrane/metabolism , Detergents , Escherichia coli Proteins/genetics , Escherichia coli Proteins/isolation & purification , Ligands , Lipoproteins/chemistry , Mutation , Proteolipids/metabolism , Solutions
8.
ASAIO J ; 52(4): 398-403, 2006.
Article in English | MEDLINE | ID: mdl-16883119

ABSTRACT

Critically ill patients often have complications of acute renal failure induced by severe infection or sepsis. The patients need administration of broad-spectrum antibiotics as well as continuous renal replacement therapy (CRRT). However, there is no uniform pharmacokinetics of antibiotics during the CRRT because CRRT is performed with the various combinations of dialysate flows (QD) and ultrafiltrate flows (QF). The aims of this study were to estimate the pharmacokinetics of panipenem/beta Mipron (PAPM/BP) and to determine the appropriate treatment regimens for PAPM/BP in critically ill patients undergoing CRRT. In patients with CRRT, the PAPM total clearance (PAPM CLtot) was calculated as the sum of PAPM clearance dependent on the living body and CRRT and shown as follows:PAPM CLtot (ml/min) = (1.2 CLcre + 66.5) + 0.86 (QD + QF) where CLcre is creatinine clearance. Pharmacokinetic values of PAPM were measured in 4 patients with CRRT. According to these results, the most appropriate treatment regimen regarding PAPM CLtot (ml/min) showed as follows:PAPM CLtot < 80 0.5 g every 12 hours or 1 g every 15 hoursPAPM CLtot 80 to 120 0.5 g every 8 hours or 1 g every 12 hoursPAPM CLtot 120 to 160 0.5 g every 6 hours or 1 g every 8 hours.


Subject(s)
Anti-Bacterial Agents/pharmacokinetics , Critical Care , Organic Anion Transporters/antagonists & inhibitors , Renal Replacement Therapy/methods , Thienamycins/pharmacokinetics , Acute Kidney Injury/therapy , Adolescent , Aged , Anti-Bacterial Agents/administration & dosage , Body Height , Body Weight , Computer Simulation , Creatinine/blood , Creatinine/urine , Critical Illness , Female , Humans , Infusions, Intravenous , Male , Metabolic Clearance Rate , Pilot Projects , Thienamycins/administration & dosage
9.
Science ; 313(5788): 842-5, 2006 Aug 11.
Article in English | MEDLINE | ID: mdl-16902140

ABSTRACT

In plants and animals, small peptide ligands that signal in cell-cell communication have been suggested to be a crucial component of development. A bioassay of single-cell transdifferentation demonstrates that a dodecapeptide with two hydroxyproline residues is the functional product of genes from the CLE family, which includes CLAVATA3 in Arabidopsis. The dodecapeptide suppresses xylem cell development at a concentration of 10(-11) M and promotes cell division. An application, corresponding to all 26 Arabidopsis CLE protein family members, of synthetic dodecapeptides reveals two counteracting signaling pathways involved in stem cell fate.


Subject(s)
Asteraceae/cytology , Cell Differentiation , Oligopeptides/metabolism , Plant Proteins/metabolism , Plant Structures/cytology , Signal Transduction , Stem Cells/cytology , Amino Acid Sequence , Arabidopsis/cytology , Arabidopsis Proteins/chemistry , Arabidopsis Proteins/metabolism , Base Sequence , Biological Assay , Cell Communication , Cells, Cultured , Ligands , Meristem/cytology , Molecular Sequence Data , Oligopeptides/chemistry , Oligopeptides/isolation & purification , Oligopeptides/pharmacology , Plant Proteins/chemistry , Plant Roots/cytology , Plant Roots/growth & development
10.
J Bacteriol ; 188(8): 2856-64, 2006 Apr.
Article in English | MEDLINE | ID: mdl-16585747

ABSTRACT

The LolCDE complex, an ATP-binding cassette (ABC) transporter, releases lipoproteins from the inner membrane, thereby initiating lipoprotein sorting to the outer membrane of Escherichia coli. The LolCDE complex is composed of two copies of an ATPase subunit, LolD, and one copy each of integral membrane subunits LolC and LolE. LolD hydrolyzes ATP on the cytoplasmic side of the inner membrane, while LolC and/or LolE recognize and release lipoproteins anchored to the periplasmic leaflet of the inner membrane. Thus, functional interaction between LolD and LolC/E is critically important for coupling of ATP hydrolysis to the lipoprotein release reaction. LolD contains a characteristic sequence called the LolD motif, which is highly conserved among LolD homologs but not other ABC transporters of E. coli. The LolD motif is suggested to be a region in contact with LolC/E, judging from the crystal structures of other ABC transporters. To determine the functions of the LolD motif, we mutagenized each of the 32 residues of the LolD motif and isolated 26 dominant-negative mutants, whose overexpression arrested growth despite the chromosomal lolD(+) background. We then selected suppressor mutations of the lolC and lolE genes that correct the growth defect caused by the LolD mutations. Mutations of the lolC suppressors were mainly located in the periplasmic loop, whereas ones of lolE suppressors were mainly located in the cytoplasmic loop, suggesting that the mode of interaction with LolD differs between LolC and LolE. Moreover, the LolD motif was found to be critical for functional interplay with LolC/E, since some LolD mutations lowered the ATPase activity of LolCDE without affecting that of LolD.


Subject(s)
ATP-Binding Cassette Transporters/metabolism , Adenosine Triphosphatases/metabolism , Escherichia coli Proteins/metabolism , Escherichia coli/enzymology , Protein Subunits/metabolism , ATP-Binding Cassette Transporters/genetics , Adenosine Triphosphatases/genetics , Amino Acid Motifs/genetics , Amino Acid Motifs/physiology , Amino Acid Sequence , Escherichia coli/genetics , Escherichia coli/growth & development , Escherichia coli Proteins/genetics , Gene Dosage , Growth Inhibitors/genetics , Lipoproteins , Models, Molecular , Molecular Sequence Data , Mutation, Missense , Protein Interaction Mapping , Protein Subunits/genetics , Sequence Homology, Amino Acid , Suppression, Genetic
11.
Plant Cell Physiol ; 46(1): 224-32, 2005 Jan.
Article in English | MEDLINE | ID: mdl-15659440

ABSTRACT

During differentiation of isolated Zinnia mesophyll cells into tracheary elements (TEs), lignification on TEs progresses by supply of monolignols not only from TEs themselves but also from surrounding xylem parenchyma-like cells through the culture medium. However, how lignin polymerizes from the secreted monolignols has not been resolved. In this study, we analyzed phenol compounds in culture medium with reversed-phase HPLC, gas chromatography-mass spectrometry and nuclear magnetic resonance spectrometry, and found 12 phenolic compounds including coniferyl alcohol and four dilignols, i.e. erythro-guaiacylglycerol-beta-coniferyl ether, threo-guaiacylglycerol-beta-coniferyl ether, dehydrodiconiferyl alcohol and pinoresinol, in the medium in which TEs were developing. Coniferyl alcohol applied to TE-inductive cultures during TE formation rapidly disappeared from the medium, and caused a sudden increase in dilignols. Addition of the dilignols promoted lignification of TEs in which monolignol biosynthesis was blocked by an inhibitor of phenylalanine anmmonia-lyase (PAL), L-alpha-aminooxy-beta-phenylpropionic acid (AOPP). These results suggested that dilignols can act as intermediates of lignin polymerization.


Subject(s)
Asteraceae/cytology , Asteraceae/metabolism , Lignin/analogs & derivatives , Phenylalanine/analogs & derivatives , Asteraceae/drug effects , Cell Differentiation , Chromatography, High Pressure Liquid , Gas Chromatography-Mass Spectrometry , Lignin/chemistry , Lignin/metabolism , Magnetic Resonance Spectroscopy , Models, Biological , Molecular Structure , Phenols/chemistry , Phenols/metabolism , Phenylalanine/pharmacology
12.
J Hum Genet ; 49(11): 629-634, 2004.
Article in English | MEDLINE | ID: mdl-15490285

ABSTRACT

Type 2 diabetes mellitus is a heterogeneous disorder, and the development of type 2 diabetes mellitus is associated with both insulin secretion defect and insulin resistance. The primary metabolic defect leading to type 2 diabetes mellitus has been thought to be varied among populations, especially in Japanese and Caucasians. Here, we have done the genome-wide scan for type 2 diabetes mellitus using 102 affected Japanese sib-pairs to identify the genetic factors predisposing to type 2 diabetes mellitus. Nonparametric linkage analysis showed one suggestive evidence for linkage to 11p13-p12 [D11S905: two-point maximum LOD score (MLS) of 2.89 and multipoint MLS of 2.32] and one nominally significant evidence for linkage to 6q15-q16 (D6S462: two-point MLS of 2.02). Interestingly, the 11p13-p12 region was reported to be a susceptibility locus for Japanese type 2 diabetes mellitus with suggestive evidence of linkage, and D11S905 was within 5 cM to D11S935 with the highest MLS in the previous linkage analysis reported. The only overlapped susceptibility region with suggestive evidence of linkage for Japanese type 2 diabetes mellitus was D11S935-D11S905 among the three reports including this study. These results taken together suggest that a susceptibility gene for type 2 diabetes mellitus in Japanese will reside in 11p13-p12.


Subject(s)
Chromosomes, Human, Pair 11/genetics , Diabetes Mellitus, Type 2/genetics , Genetic Linkage , Genome, Human , Genetic Predisposition to Disease , Humans , Japan , Lod Score
13.
Appl Environ Microbiol ; 69(12): 6969-78, 2003 Dec.
Article in English | MEDLINE | ID: mdl-14660338

ABSTRACT

We have shown that a xylan-degrading bacterium, W-61, excretes multiple xylanases, including xylanase 5 with a molecular mass of 140 kDa. Here, we emend the previously used classification of the bacterium (i.e., Aeromonas caviae W-61) to Paenibacillus sp. strain W-61 on the basis of the nucleotide sequence of the 16S rRNA gene, and we clone and express the xyn5 gene encoding xylanase 5 (Xyn5) in Escherichia coli and study the subcellular localization of Xyn5. xyn5 encodes 1,326 amino acid residues, including a 27-amino-acid signal sequence. Sequence analysis indicated that Xyn5 comprises two family 22 carbohydrate-binding modules (CBM), a family 10 catalytic domain of glycosyl hydrolases, a family 9 CBM, a domain similar to the lysine-rich region of Clostridium thermocellum SdbA, and three S-layer-homologous (SLH) domains. Recombinant Xyn5 bound to a crystalline cellulose, Avicel PH-101, while an N-terminal 90-kDa fragment of Xyn5, which lacks the C-terminal half of the family 9 CBM, did not bind to Avicel PH-101. Xyn5 was cell bound, and the cell-bound protein was digested by exogenous trypsin to produce immunoreactive and xylanolytic fragments with molecular masses of 80 and 60 kDa. Xyn5 was exclusively distributed in the cell envelope fraction consisting of a peptidoglycan-containing layer and an associated S layer. Thus, Paenibacillus sp. strain W-61 Xyn5 is a cell surface-anchored modular xylanase possessing a functional cellulose-binding module and SLH domains. Possible cooperative action of multiple xylanases produced by strain W-61 is discussed on the basis of the modular structure of Xyn5.


Subject(s)
Bacillaceae/classification , Bacillaceae/enzymology , Cell Membrane/metabolism , Cloning, Molecular , Xylosidases/genetics , Xylosidases/metabolism , Bacillaceae/genetics , Bacillaceae/metabolism , DNA, Ribosomal/analysis , Escherichia coli/enzymology , Escherichia coli/genetics , Gene Expression Regulation, Bacterial , Molecular Sequence Data , RNA, Ribosomal, 16S/genetics , Sequence Analysis, DNA , Xylans/metabolism , Xylosidases/chemistry
14.
Bioorg Med Chem ; 11(3): 433-50, 2003 Feb 06.
Article in English | MEDLINE | ID: mdl-12517439

ABSTRACT

HB-EGF Shedding inhibitors have been expected to become effective medicines for skin diseases caused by the proliferation of keratinocytes. In order to discover novel HB-EGF shedding inhibitors and clarify their structure-activity relationships, 5,6,7,8-tetrahydronaphthylidine-based hydroxamic acid and 5,6,7,8-tetrahydropyrido[3,4-b]pyrazine-based hydroxamic acids have been synthesized. Among the synthesized compounds, the ethoxyethoxy derivative 3o and the methoxypropoxy derivative 3p exhibited much more potent HB-EGF shedding inhibitory activity than CGS 27023A. The structural modification of 5,6,7,8-tetrahydropyrido[3,4-b]pyrazine-based hydroxamic acids enabled us to establish the following structure-activity relationships; the existence of the hydroxamic acid, the sulfonamide, and the phenyl moieties are crucial for a potent HB-EGF shedding inhibitory activity, and the stereochemistry of the alpha carbon of hydroxamic acid is also important. In addition, from the comparison of their HB-EGF shedding inhibitory activities with their MMPs inhibitory activities, we found that the S1' pocket of the responsible enzyme for HB-EGF shedding is deep unlike that of MMP-1.


Subject(s)
Epidermal Growth Factor/antagonists & inhibitors , Hydroxamic Acids/chemistry , Hydroxamic Acids/pharmacology , Pyrazines/chemistry , Pyrazines/pharmacology , Heparin-binding EGF-like Growth Factor , Humans , Hydroxamic Acids/chemical synthesis , Intercellular Signaling Peptides and Proteins , Protease Inhibitors/chemistry , Protease Inhibitors/pharmacology , Pyrazines/chemical synthesis , Stereoisomerism , Structure-Activity Relationship , Sulfonamides/chemical synthesis , Sulfonamides/chemistry , Sulfonamides/pharmacology , Tumor Cells, Cultured
15.
J Smooth Muscle Res ; 38(1-2): 39-50, 2002 Apr.
Article in English | MEDLINE | ID: mdl-12199531

ABSTRACT

Endothelium-removed carotid artery strips from stroke-prone spontaneously hypertensive rats spontaneously developed a tonic myogenic contraction. Flufenamic acid reduced the resting tone observed during superfusion with Tyrode's solution, in a concentration-dependent manner. Flufenamic acid also inhibited contractions produced by high-K solutions in a concentration-dependent manner. The resting membrane potential of smooth muscle cells in the artery was around -32 mV, with occasional oscillatory potentials. Flufenamic acid hyperpolarized the membrane in a concentration-dependent manner. The voltage-dependent outward currents recorded in isolated cells with micropipettes filled with high-K+ solution (holding potential, -60 mV) were enhanced by flufenamic acid and inhibited by tetraethylammonium. When the recording micropipette was filled with high Cs to inhibit the K+-current, depolarizing step pulses evoked nifedipine-sensitive inward currents. Flufenamic acid inhibited the inward currents. These results indicate that flufenamic acid inhibits the spontaneous active tone of the carotid artery by inhibiting L-type Ca2+-channels and possibly by membrane hyperpolarization through activation of the voltage-dependent K+-channels.


Subject(s)
Anti-Inflammatory Agents, Non-Steroidal/pharmacology , Carotid Artery, Common/drug effects , Flufenamic Acid/pharmacology , Muscle, Smooth, Vascular/drug effects , Animals , Calcium/metabolism , Calcium Channels, L-Type/physiology , Carotid Artery, Common/physiology , Male , Membrane Potentials/drug effects , Muscle, Smooth, Vascular/physiology , Patch-Clamp Techniques , Potassium/metabolism , Potassium Channels, Voltage-Gated/physiology , Rats , Rats, Inbred SHR
16.
J Med Chem ; 45(4): 919-29, 2002 Feb 14.
Article in English | MEDLINE | ID: mdl-11831904

ABSTRACT

A series of phosphonamide-based hydroxamate derivatives were synthesized, and the inhibitory activities were evaluated against various metalloproteinases in order to clarify its selectivity profile. Among the four diastereomeric isomers resulting from the chirality at the C-3 and P atoms, the compound with a (R,R)-configuration both at the C-3 position and the phosphorus atom was found to be potently active, while the other diastereomeric isomers were almost inactive. A number of (R,R)-compounds synthesized here exhibited broad spectrum activities with nanomolar K(i) values against MMP-1, -3, -9, and TACE and also showed nanomolar IC(50) values against HB-EGF shedding in a cell-based inhibition assay. The modeling study using X-ray structure of MMP-3 suggested the possible binding mode of the phosphonamide-based inhibitors.


Subject(s)
Amides/chemical synthesis , Hydroxamic Acids/chemical synthesis , Metalloendopeptidases/antagonists & inhibitors , Organophosphonates/chemical synthesis , Protease Inhibitors/chemical synthesis , Amides/chemistry , Amides/pharmacology , Crystallography, X-Ray , Epidermal Growth Factor/antagonists & inhibitors , Heparin-binding EGF-like Growth Factor , Humans , Hydroxamic Acids/chemistry , Hydroxamic Acids/pharmacology , Intercellular Signaling Peptides and Proteins , Matrix Metalloproteinase 1/chemistry , Matrix Metalloproteinase 3/chemistry , Matrix Metalloproteinase 9/chemistry , Matrix Metalloproteinase Inhibitors , Metalloendopeptidases/chemistry , Models, Molecular , Organophosphonates/chemistry , Organophosphonates/pharmacology , Protease Inhibitors/chemistry , Protease Inhibitors/pharmacology , Protein Binding , Recombinant Proteins/chemistry , Stereoisomerism , Structure-Activity Relationship , Tumor Cells, Cultured
17.
Acta AWHO ; 16(2): 87-91, abr.-jun. 1997. tab
Article in Portuguese | LILACS | ID: lil-196318

ABSTRACT

Dez pacientes do sexo feminino, de 11 a 19 anos de idade, com escoliose idiopática nas vértebras torácicas e lombar foram submetidas à avaliaçäo otoneurológica realizada com vecto-eletronistagmografia, verificando-se que este distúrbio ostopédico näo afeta o funcionamento do sistema vestibular.


Subject(s)
Humans , Female , Child , Adolescent , Adult , Scoliosis/physiopathology , Lumbar Vertebrae/physiopathology , Thoracic Vertebrae/physiopathology , Vestibule, Labyrinth/physiopathology , Electronystagmography , Nystagmus, Pathologic , Postural Balance
18.
Acta AWHO ; 15(4): 212-4, out.-dez. 1996.
Article in Portuguese | LILACS | ID: lil-184024

ABSTRACT

A audiometria do tronco encefálico deve ser realizada em ambiente silencioso, aconchegante e com pouca luminosidade. O relaxamento do paciente é indispensável, pois as contraçoes musculares interferem na morfologia das ondas dificultando a análise do exame. Em crianças, o relaxamento pode ser conseguido com o sono natural oou com sedativos. Relatamos a nossa experiência com o uso de hidrato de cloral a 20 por cento, como sedativo, em mil pacientes pediátricos submetidos à audiometria de tronco encefálico.


Subject(s)
Humans , Infant, Newborn , Infant , Child, Preschool , Child , Adolescent , Audiometry, Evoked Response , Chloral Hydrate/pharmacology , Hypnotics and Sedatives/pharmacology , Muscle Relaxation/drug effects , Chloral Hydrate/administration & dosage , Hypnotics and Sedatives/administration & dosage , Retrospective Studies
19.
Pró-fono ; 8(1): 29-35, mar. 1996. ilus
Article in Portuguese | LILACS | ID: lil-205768

ABSTRACT

O presente trabalho teve como objetivo enfatizar a importância da avaliaçäo otoneurológica, para o diagnóstico precoce dos tumores de ângulo ponto cerebelar


Subject(s)
Humans , Male , Female , Aged , Neuroma, Acoustic/diagnosis , Audiometry , Neuroma, Acoustic/complications , Tomography
20.
Acta AWHO ; 15(1): 27-32, jan.-mar. 1996. tab
Article in Portuguese | LILACS | ID: lil-163131

ABSTRACT

Para a realizaçao desta pesquisa, foram avaliados 22 indivíduos com idade entre 18 e 51 anos, intoxicados por solventes, cuja comprovaçao foi dada laboratorialmente. O estudo foi realizado no Setor de Otoneurologia do Departamento de Otorrinolaringologia e Distúrbios da comunicaçao Humana da Universidade Federal de Sao Paulo - Escola Paulista de Medicina. Todos os pacientes foram submetidos à avaliaçao Otoneurológica com a realizaçao do Exame Vestibular. Observamos que 12 (54,54 por cento) dos casos revelaram Exame Vestibular Normal como diagnóstico final, 6 (27,27 por cento) dos indivíduos foram diagnosticados como portadores de Síndrome Vestibular Periférica irritativa e em 1 (4,54 por ento) caso foi constatado Síndrome Vestibular de Tronco Encefálico.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Adolescent , Solvents/poisoning , Vestibular Function Tests , Vertigo/etiology
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