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Biomedical subjects

Y Tsuruta

Publications and source records attributed to Y Tsuruta.

At least 19 recordsLinked to original sources
PubMed1996

Fluorometric determination of phenol and p-cresol in urine by precolumn high-performance liquid chromatography using 4-(N-phthalimidinyl)benzenesulfonyl chloride.

A sensitive HPLC method for simultaneous determination of phenol and p-cresol in urine was developed. After acid hydrolysis of urine was conducted, phenol and p-cresol were extracted with diisopropyl ether and derivatized with 4-(N-phthalimidinyl)benzenesulfonyl chloride to give fluorescent sulfonyl esters. The labeling reactions were completed at 75 degrees C for 10 min. The fluorescent derivatives were separated on a reversed-phase column by a gradient elution with acetonitrile-water and detected by fluorescence measurement of excitation at 300 nm and emission at 410 nm. The detection limits (signal-to-noise ratio = 3) for phenol and p-cresol were 0.17 and 0.25 pmol per injection, respectively. The within-day and day-to-day relative standard deviations were 2.31-3.76 and 4.36%, respectively, for phenol and 1.99-4.56 and 3.71%, respectively, for p-cresol. The concentrations (means) of phenol and p-cresol in normal human urine were 67.3 and 167.9 nmol/mg creatinine, respectively.

Adult↗
PubMed1996

Definition of the mitogenic factor (MF) as a novel streptococcal superantigen that is different from streptococcal pyrogenic exotoxins A, B, and C.

Human T cell activation by recombinant mitogenic factor (rMF) was investigated in comparison with that by recombinant streptococcal pyrogenic exotoxins (rSPE) A, B, and C. Recombinant MF, rSPEA, and rSPEC were mitogenic for peripheral blood mononuclear cells (PBMC), whereas rSPEB was not. Recombinant MF required only HLA-DR for the stimulation of PBMC, as determined using monoclonal antibodies (mAb) to HLA class II molecules and the mouse L cells transfected with HLA class II molecules. Recombinant SPEA and rSPEC required HLA-DR or HLA-DQ molecule. Recombinant MF selectively stimulated V beta 2, V beta 7, V beta 8, V beta 18 and V beta 21-bearing T cells, whereas rSPEA and rSPEC activated V beta 2 and V beta 6-bearing T cells as evaluated by the quantitative T cell receptor (TCR) analytical method. No clonality was observed in the nucleotide sequences of complementarity determining region 3 of TCR V beta in T cells responding to rMF. The profiles of cytokine production by PBMC in response to rMF, rSPEA, and rSPEC were quite similar. In summary, these results demonstrate that both HLA class II molecules and the TCR V beta required for rMF-mediated T cell activation are distinct from those required for rSPEA or rSPEC-mediated activation. Therefore, the MF is a novel streptococcal super-antigen which is different from SPEA, SPEB, and SPEC.

Bacterial Proteins↗
PubMed1996

Spontaneous conception and intrauterine pregnancy in a symptomatic missed abortion of ectopic pregnancy conceived in the previous cycle.

We encountered a rare case of combined intrauterine and extrauterine pregnancy that occurred following separate spontaneous ovulations. A 33 year old woman visited our hospital with the chief complaint of abdominal pain on April 16, 1993. Her last menstruation was from March 23 for 6 days. However, the urinary human chorionic gonadotrophin (HCG) on April 19 was 1024 IU/l. Pelvic examination and ultrasonography indicated an extrauterine pregnancy, which was confirmed by laparotomy and histological identification of trophoblast cells. The urinary HCG concentration markedly decreased after the operation. However, the HCG level increased again on the fifth post-operative day, and a gestational sac (11 mm) was identified in the uterine cavity on the 11th post-operative day, indicating that this intrauterine pregnancy was established following spontaneous ovulation which occurred before the removal of the extrauterine pregnancy. This case indicates that a combined pregnancy can occur not only after simultaneous multiple ovulations but also after the separate spontaneous ovulations.

Adult↗
PubMed1996

Characterization of spirochetes isolated from ticks (Ixodes tanuki, Ixodes turdus, and Ixodes columnae) and comparison of the sequences with those of Borrelia burgdorferi sensu lato strains.

Ixodes persulcatus serves as a tick vector for Borrelia garinii and Borrelia afzelii in Japan; however, unidentified spirochetes have been isolated from other species of ticks. In this study, 13 isolates from ticks (6 from Ixodes tanuki, 6 from Ixodes turdus, and 1 from Ixodes columnae) and 3 isolates from voles (Clethrionomys rufocanus) were characterized by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, rRNA gene restriction fragment length polymorphism, partial sequencing of the outer surface protein C (OspC) gene, whole DNA-DNA hybridization, and 16S rRNA gene sequence comparison. All of the results revealed that these Borrelia strains clearly represent at least two new species. A third is also likely, although additional strains have to be isolated and characterized before a separate species is designated. We designated all isolates of I. tanuki and C. rufocanus as group Hk501 and all isolates of I. turdus as group Ya501. Phylogenetic analysis based on 16S rRNA gene sequences distinguished these Borrelia strains from those belonging to hitherto known Borrelia species. Furthermore, the genomic groups, each with its own tick vectors with enzootic cycles, were quite different from each other and also from those of Lyme disease Borrelia species known to occur in Japan. The results of 16S rRNA gene sequence comparison suggest that the strain Am501 from I. columnae is related to group Hk501, although its level of DNA relatedness is less than 70%.

Amino Acid Sequence↗
PubMed1996

Determination of total hydroxyproline and proline in human serum and urine by HPLC with fluorescence detection.

A method to measure total hydroxyproline (Hyp) and proline (Pro) in human serum and urine by HPLC was developed. Hyp and Pro in acid hydrolysates of serum and urine were derivatized with 4-(5,6-dimethoxy-2-phthalimidinyl)phenysulfonyl chloride after treatment with o-phthaladehyde and cleanup on Bond Elut C18 column. The derivatives of imino acids were separated on a reversed phase column by gradient elution with acetonitrile and phosphate buffer (1 mmol/l, pH 7) and detected by fluorescence measurement at 315 nm (excitation) and 385 nm (emission). Detection limits for both Hyp and Pro were 10 fmol per injection. The within-day and day-to-day relative standard deviations for Hyp and Pro in serum and urine were less than 3.19%. The recoveries of Hyp and Pro added to serum and urine were about 100%. The present method was applied to determine total Hyp and Pro in serum and urine from normal subjects and patients with chronic renal failure.

Adult↗
PubMed1995

Determination of free hydroxyproline and proline in human serum by high-performance liquid chromatography using 4-(5,6-dimethoxy-2-phthalimidinyl)phenylsulfonyl chloride as a pre-column fluorescent labelling reagent.

A fluorescent labelling reagent, 4-(5,6-dimethoxy-2-phthalimidinyl)phenylsulfonyl chloride, was designed for the determination of amines by precolumn HPLC and was applied to the simultaneous determination of hydroxyproline and proline in serum. The reagent reacted with hydroxyproline and proline at 30 degrees C for 10 min to produce the fluorescent derivatives, which were separated on a reversed-phase column by gradient elution with phosphate buffer (1 mmol l-1, pH 7) and acetonitrile and detected by fluorescence measurement at 315 nm (excitation) and 385 nm (emission). The detection limits (signal-to-noise ratio = 3) for both hydroxyproline and proline were 10 fmol per injection. The within-day (n = 10) and day-to-day (n = 5) relative standard deviations using human sera were less than 2.16% and 2.75%, respectively, for hydroxyproline and less than 2.30% and 3.25%, respectively, for proline. The concentrations of free hydroxyproline and proline in normal human sera (n = 13) were 5.6-18.0 and 137.6-252.6 mumol l-1, respectively. The proposed method was also applied to the determination of hydroxyproline and proline in sera from patients with chronic renal failure. The mean concentrations of hydroxyproline and proline in chronic renal failure were about 2.6 and 1.6 times higher, respectively, than those in normal human sera.

Chromatography, High Pressure Liquid↗
PubMed1995

Genetic and phenotypic analysis of Borrelia miyamotoi sp. nov., isolated from the ixodid tick Ixodes persulcatus, the vector for Lyme disease in Japan.

The ixodid tick Ixodes persulcatus is the most important vector of Lyme disease in Japan. Most spirochete isolates obtained from I. persulcatus ticks have been classified as Borrelia burgdorferi sensu lato because of their genetic, biological, and immunological characteristics. However, we found that a small number of isolates obtained from I. persulcatus contained a smaller 38-kDa endoflagellar protein and single 23S-5S rRNA gene unit. Representative isolate HT31T (T = type strain) had the same 23S rRNA gene physical map as Borrelia turicatae. The DNA base composition of strain HT31T was 28.6 mol% G+C. DNA-DNA hybridization experiments revealed that strain HT31T exhibited moderate levels of DNA relatedness (24 to 51%) with Borrelia hermsii, B. turicatae, Borrelia parkeri, and Borrelia coriaceae. However, the levels of DNA reassociation with the previously described Lyme disease borreliae (B. burgdorferi, Borrelia garinii, and Borrelia afzelii) were only 8 to 13%. None of the previously described species examined exhibited a high level of DNA relatedness with strain HT31T. In addition, the 16S rRNA gene sequence (length, 1,368 nucleotides) of strain HT31T was determined and aligned with the 16S rRNA sequences of other Borrelia species. Distance matrix analyses were performed, and a phylogenetic tree was constructed. The results showed that isolate HT31T is only distantly related to both previously described Lyme disease borreliae and relapsing fever borreliae. Thus, the spirochetes isolated from I. persulcatus and closely related isolates should be classified as members of a new Borrelia species. We propose the name Borrelia miyamotoi sp. nov. for this spirochete; strain HT31 is the type strain.

Animals↗
PubMed1995

[A case of CABG in a patient complicated with von Willebrand's disease secondary to polycythemia vera].

We report a case of 47-year-old patient with von Willebrand's disease (VWD) caused by polycythemia vera (PV) who underwent CABG surgery. The patient has been suffering of PV for 10 years and was admitted because of post infarction angina. On admission, she was found to have a decreased von Willebrand factor which was suggested by prolonged APTT. CABG was safely performed without undue bleeding with the use of Factor VIII concentrates. The appropriate control of polycythemic state before surgery and perioperative use of Factor VIII concentrates was considered to be important for successful open heart surgery associated with such complication.

Angina Pectoris↗
PubMed1995

[A case report of acute pulmonary valve endocarditis caused by fungi].

A 42 years old female was admitted for evaluation of unrelenting fever and dyspnea on exertion in March, 1991. The patient had a VSD closure in 1968. After admission, serial blood cultures were found to be positive for Candida Parapsilosis and a massive vegetation on the pulmonary valve was demonstrated by echocardiography. Chest X-ray disclosed a wedge-shaped density in the right middle lung lobe that was a compatible finding with pulmonary infarction. At surgery, performed 3 days later the admission, pulmonary valve was entirely resected without replacing it with prosthesis. Antifungal treatment was intensively given afterwards. Her postoperative course was without event and she was sent home on the 51st postoperative day. Right heart catheterization done two years surgery, revealed the pulmonary vascular resistance was 216 dynes sec cm-5. We anticipate that this degree of pulmonary vascular resistance will allow the patient enough to do well without needing valve prosthesis in the near future.

Acute Disease↗
PubMed1994

Molecular analysis of T cell receptor V beta chain to detect leukemia cell clonality in patients by adaptor ligation-mediated polymerase chain reaction.

We have developed a simple and rapid method to analyze the clonality of leukemia cells. After three rounds of amplification by adaptor-ligation polymerase chain reaction (PCR), the cDNA is cut with AluI, HaeIII, RsaI, and Sau3AI, and analyzed by polyacrylamide gel electrophoresis. The size of the restriction fragments is compared to that of the published restriction fragments size each TCR-beta subfamily V region. The sensitivity of adaptor-ligation PCR restriction enzyme analysis (AL-PCR-REA) was 10(-4) MOLT-4 T-ALL cell population in the normal peripheral blood lymphocytes (PBL). Application of AL-PCR-REA to PBL and bone marrow (BM) cells from eight clinical leukemia samples indicated that a detection sensitivity was rather low, but revealed the clonality of all eight clinical samples. This AL-PCR-REA method can detect clonality without the need for either radioisotopes or sequencing procedures.

Base Sequence↗
PubMed1994

Analysis of the population of human T cell receptor gamma and delta chain variable region subfamilies by reverse dot blot hybridization.

We have developed a simple method to analyze the population of T cell receptor (TCR) gamma and delta chain variable (V) region subfamilies by the application of reverse dot blot hybridization, which was originally developed for the analysis of human HLA-DR polymorphism. The four oligonucleotides corresponding to each TCR-gamma V region subfamily and the six oligonucleotides to each TCR-delta V region gene were synthesized, and tailed with dTTP. The cDNA was amplified by ligation-mediated PCR in the presence of biotinylated deoxynucleotides. Hybridization between immobilized specific oligoprobes and biotinylated target DNA was nonradioactively detected by a reaction using alkaline phosphatase. The population of the V region subfamilies of TCR-gamma and -delta in PBL analyzed by reverse dot blot hybridization described here showed good correlations with the result of colony hybridization.

Base Sequence↗
PubMed1994

High peroxidative susceptibility of fish oil polyunsaturated fatty acid in cultured rat hepatocytes.

The peroxidative susceptibility in cultured rat hepatocytes of eicosapentaenoic acid (EPA) and other polyunsaturated fatty acids (PUFA) with different numbers of double bonds was examined. Lipid peroxidation was evaluated using a newly developed HPLC procedure which includes the determination of malondialdehyde (MDA). Following exposure to 0.25-1.0 mM EPA adsorbed to BSA (EPA-BSA), cultured hepatocytes produced MDA in the fatty acid concentration- and incubation time-dependent manner. The rate of MDA production by hepatocytes varied greatly with the degree of PUFA unsaturation, and ranked as follows: docosahexaenoic acid > EPA > arachidonic acid > alpha-linolenic acid = gamma-linolenic acid > linoleic acid > oleic acid. Prolonged exposure of cultured hepatocytes to 1.0 mM EPA-BSA resulted in substantial leakage of LDH into the medium. The cell injury was associated with the loss of cellular GSH and protein thiol groups. Cotreatment of the EPA-supplemented hepatocytes with a GSH-depleting agent, diethylmaleate, promoted the cellular protein thiol loss and LDH leakage. An iron chelator, deferoxamine, and other antioxidants such as N,N-diphenyl-p-phenylenediamine and gamma-tocopherol efficiently prevented MDA production and consequently LDH leakage in the EPA-supplemented hepatocytes. These results show that peroxidative deterioration in excess of GSH-dependent defense mechanisms may occur in hepatocytes loaded with highly peroxidizable fish oil PUFA.

Animals↗
PubMed1994

Tissue transmigration of CZON (Cosmosin) to middle ear mucosa, maxillary sinus mucosa, and palatine tonsils.

The concentration of CZON was determined by HPLC in surgical patients with chronic otitis media, sinusitis, and tonsillitis. One gram of CZON was injected intravenously prior to surgery. The time course of the mean tissue CZON level was as follows: In the middle ear mucosa, 3.7 micrograms/g at 15 min, 7.2 micrograms/g at 30 min, and 2.9 micrograms/g at 1 hr (the half life: 21.3 min). In the maxillary sinus mucosa, 10.5 micrograms/g at 15 min, 11.8 micrograms/g at 30 min, and 2.8 micrograms/g at 1 hr (the half life: 17.5 min). In the tonsils, 14.9 micrograms/g at 15 min, 9.3 micrograms/g at 30 min, and 2.0 micrograms/g at 1 hr (the half life: 13.2 min). The concentration was high in the maxillary sinus mucosa and the tonsils, but was low in the middle ear mucosa. In the formers the transfer ratio reached its peak 15 to 30 min after administration, but in the latter the peak was reached 30 to 60 min after administration. The order of the transfer ratio at each region was above 25%. The tissue concentration exceeded the MIC80s of frequent isolates from these infections. CZON is considered to be a highly useful drug in the treatment of these infections.

Adolescent↗
PubMed1994

[Prenatally diagnosed bilateral multicystic dysplastic kidneys associated with multiple anomalies: a case report].

A case of bilateral multicystic dysplastic kidneys with multiple anomalies is reported. Prenatal ultrasonography showed oligohydramnios, atrial septal defect, bilateral multicystic kidneys, omphalocele, and bowel dilatation. A male baby died of respiratory insufficiency immediately after premature delivery. Autopsy showed multiple anomalies of face, fingers, lung, heart, bowels, and genitourinary tract. Seven more cases with urinary tract anomalies prenatally detected by ultrasonography are also reported. Ultrasonography is useful to diagnose anomalies of fetus.

Abnormalities, Multiple↗
PubMed1994

Phenotypic expressions of type I, III, IV, V, and VI collagens in patients with diabetic nephropathy: immunohistochemical comparison between HD and non-HD patients.

Molecular organization of extracellular matrix (ECM) in the kidney may change as impairment of renal function progresses. The present immunohistochemical study of the kidney was designed to compare localization of type I, III, IV, V, and VI collagens between "Group A" (13 patients on maintenance hemodialysis due to diabetic nephropathy) and "Group B" (13 patients with diabetic nephropathy and massive proteinuria whose serum creatinine levels were 1.3 +/- 0.5 mg/dl, mean +/- SD). Nodular scleroses that were commonly observed both in Group A (87.8 +/- 10.1%) and B (80.5 +/- 17.0%) were stained in a very similar way with antibodies against collagen types IV, V, and VI. On the contrary, thickened Bowman's capsules that were observed exclusively in Group A (80.7 +/- 10.4% in Group A versus 5.7 +/- 6.2% in Group B) were stained intensely with antibodies against collagen types I and III. Normal and expanded peritubular interstitium from every group was stained with all of the above antibodies in an identical manner. Taken together, these results indicated a close relationship between severe impairment of residual renal function and a high incidence of thickened Bowman's capsule rich in type I and III collagens.

Aged↗
PubMed1994

[Damus-Kaye-Stansel procedure following Van Praagh (PA-descending Ao shunt) for complete transposition of the great arteries, hypoplastic aortic arch and coarctation].

A newborn baby with d-TGA, straddling AV valve, large VSD, hypoplastic ascending aorta and coarctation of the aorta had congestive heart failure and oliguria on the 3rd day after birth. Van Praagh's operation (main pulmonary artery to descending aorta bypassing with synthetic graft) was performed on 4 days of age through a lateral thoracotomy. At the age of 2 months, the patient underwent left pulmonary artery banding because of respiratory insufficiency requiring prolonged ventilatory support. The patient subsequently underwent Damus-Kaye-Stansel procedure without enlargement of the arch, and the pulmonary patch angioplasty with right modified BT shunt on the age of 5 months. This baby was discharged on 4 months after the operation. Two-dimensional echocardiography has shown aortic and pulmonary competence postoperatively.

Anastomosis, Surgical↗
PubMed1994

[Thrombosed St. Jude Medical prosthesis with drug induced hepatitis due to warfarin potassium--a case report].

A case was presented of a 51-year-old woman who underwent aortic valve replacement with a St. Jude Medical prosthesis two and a half years before. The patient was initially placed on Warfarin potassium after the surgery. However she gradually developed jaundice during the period of two months Warfarin was replaced with ticlopidine hydrochloride as it was thought to be the most probable cause of jaundice. The prosthesis was subsequently thrombosed and had to be replaced with a Carpentier bovine pericardial valve. Warfarin potassium rarely induces the hepatic dysfunction as a result of drug allergy. However, the prompt diagnosis and adequate management are essential if it should occur.

Aortic Valve↗