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Biomedical subjects

T Itou

Publications and source records attributed to T Itou.

At least 37 records · Page 2Linked to original sources

[Adenocarcinoma of the renal pelvis and transitional cell carcinoma of the ureter occurring 11 years after radical cystectomy for bladder cancer: a case report].

We report a case of upper urinary tract carcinoma which recurred 11 years after total cystectomy. A 52-year-old man presented with complaints of a sense of residual urine and terminal miction pain. Urinary cytology, cystoscopic examination and intravenous pyelography revealed normal findings. Twenty months later, because class V urinary cytologic findings were detected, transurethral biopsy was performed. Carcinoma in situ was diagnosed pathologically. Therefore, total cystectomy and ileal conduit urinary diversion were performed. The pathological diagnosis was transitional cell carcinoma, grade 3, pTis. At 127 months postoperatively, laboratory examination revealed an extremely high serum level of LDH (3,084 U/l). The right kidney was not visualized on IVP and computed tomography revealed a right renal irregular mass. On the suspicion of a renal pelvic tumor, right total nephroureterectomy was done. The pathologic diagnosis was renal pelvic adenocarcinoma and ureteral transitional cell carcinoma. The patient was treated postoperatively with 3 cycles of systemic chemotherapy and radiotherapy. The serum level of LDH returned to normal. However, one year later, the serum level of LDH elevated to 1,118 U/l. He died of retroperitoneal lymph node, left adrenal gland and pulmonary metastases.

Adenocarcinoma↗

Molecular cloning and identification of bottle-nosed dolphin flavocytochrome b gp91(phox) and p22(phox) subunits.

The bottle-nosed dolphin (Tursiops truncatus) gp91(phox) and p22(phox) cDNA were cloned from mitogen stimulated leukocytes RNA utilizing the reverse transcription-polymerase chain reaction. The sequences of these cDNAs showed that dolphin gp91(phox) and p22(phox) clones contained open reading frames encoding 569 and 192 amino acids, respectively. Analysis of the gp91(phox) amino acids sequence showed three potential N-linked glycosylation sites. Comparison of the deduced amino acid showed that dolphin gp91(phox) sequence shared 95.4, 93.8, 91.4 and 89.5% similarity with the bovine, porcine, human and mouse gp91(phox) sequences, respectively. Similarly, the amino acid sequence showed that dolphin p22(phox) shared 89.7, 84.6, 84.1, 83.6 and 83.6% similarity with the bovine, mouse, porcine, human and rattus p22(phox) sequences, respectively. Western blotting analysis with anti-peptide antibodies supported the molecular weights of the dolphin gp91(phox) and p22(phox) homologous proteins predicted from the cDNAs and amino acids sequence data.

Amino Acid Sequence↗

Peculiar respiratory response observed during sleep-onset REM sleep of an infant with Ondine's curse.

We treated an infant with congenital central hypoventilation syndrome ("Ondine's curse"). She was cyanotic and given ventilatory support at the first hour after birth. An investigation of sleep state and respiration performed at the age of 3 months led to this diagnosis. Hypoventilation persisted in all sleep stages, with the most severely reduced tidal volumes occurring during delta-wave sleep (stages 3 and 4). In addition, severe secondary reduction in tidal volumes occurred in sleep-onset REM sleep. This phenomenon was absent in non sleep-onset REM sleep. At 4 months of age, her respiratory treatment was successfully converted to positive-pressure ventilation via a nasal mask, thus avoiding tracheotomy. This transition to noninvasive ventilatory support dramatically improved her quality of life during wakefulness. This report may be a clue to discuss the function of sleep-onset REM sleep seen in the early stage of life and suggests that nasal mask ventilation is a viable option in selected cases with congenital central hypoventilation syndrome (CCHS).

Female↗

[One advice to the decision of graft size for ascending and total arch graft replacement (in a case of differential diameters in ascending aorta and descending aorta)].

We carried out the surgery of thoracic aortic aneurysm in fifty-eight patients from June 1994 to February 1999 (including aortic dissection in twenty-six patients). The mean size of grafts were 28.1 mm in ascending graft replacement, 25.8 mm in both ascending and arch graft replacement and 23.8 mm in descending graft replacement. The grafts for ascending aortic aneurysm were significantly larger than those for descending aortic aneurysm. In two of twenty-six patients undergoing both ascending and arch graft replacement, different size of grafts were used for ascending replacement and for arch replacement with satisfactory results in terms of bleeding from the anastomotic sites. Case 1; A 45-year-female with aortitis syndrome and aortic regurgitation due to annuloaorticectasia and thoracic aortic aneurysm underwent simultaneous aortic root replacement with composite graft (25 mm St. Jude Medical valve and 28 mm Hemashield graft) and total arch replacement (30 mm Hemashield graft with two side branches). Case 2; A 64-year-female was diagnosed as chronic type II dissecting aneurysm combined with acute type I aortic dissection. Ascending aorta was replaced with a 26 mm Hemashield graft, and the aortic arch was replaced with a 24 mm Hemashield graft with three side branches.

Anastomosis, Surgical↗

[Home infusion therapy system from a resident's point of view].

We started a new home infusion therapy system in July 1999. The home infusion therapy system is made up of doctors, nursing stations, and pharmacies in the community. We coordinate these parties before patient discharge from our hospital and support them when the patient needs hospitalization (for example, he or she develops pneumonia). This report discusses past experiences and future issue.

Home Care Services, Hospital-Based↗

Analysis of localization and function of the COOH-terminal corresponding site of cytochrome b558 in fish neutrophils.

Using an antibody against the synthetic peptide corresponding to the COOH-terminal region of human cytochrome b558 large subunit, a broad band was specifically detected in neutrophil lysates from 6 marine fish and 2 freshwater fish by western blotting. Immunofluorescence assay showed that the antibody recognized the epitopes in eel and tilapia neutrophils permeabilized with detergent. These results suggest that the cytochrome b large subunit universally exists in fish neutrophils and that the epitopes are exposed to the cytoplasmic side of fish neutrophils as well as human neutrophils. Furthermore, a synthetic peptide corresponding to the COOH-terminus of the large subunit apparently blocked superoxide production in a specific and dose-dependent fashion in eel and tilapia neutrophils, indicating that the region equivalent to the COOH-terminus of cytochrome b large subunit is responsible for superoxide generation in fish neutrophils.

Amino Acid Sequence↗

Prevalence of calf diarrhea caused by bovine group A rotavirus carrying G serotype 8 specificity.

One hundred and seventeen rectal fecal specimens were collected in 1995 and 1996 from calves with diarrhea in Kagoshima Prefecture in Japan. The bovine group A rotavirus was detected by enzyme immunoassay in 43 of 117 specimens and isolated from 33 of the 43 specimens that were positive. G serotype, P serotype, and P genotype of 33 isolates were identified by reverse transcription-polymerase chain reaction, and 20 of 33 isolates (60.6%) were identified as G serotype 8. Thus, we discovered that calf diarrhea caused by bovine group A rotavirus carrying G serotype 8 specificity was prevalent in this research area during this research period. To our knowledge, this is the first report on the prevalence of calf diarrhea caused by the bovine group A rotavirus carrying G serotype 8 specificity.

Animals↗

Cloning and sequencing of a bottle-nosed dolphin (Tursiops truncatus) interleukin-1alpha and -1beta complementary DNAs.

The bottle-nosed dolphin (Tursiops truncatus) IL-1alpha and IL-1beta cDNA were cloned from mitogen stimulated peripheral blood mononuclear cells (PBMC) RNA utilizing the reverse transcription-polymerase chain reaction (RT-PCR). The sequences of these cDNAs showed that dolphin IL-1alpha and IL-1beta clones contained open reading frames encoding 265 and 266 amino acids, respectively. Comparison of the deduced amino acid showed that dolphin IL-1alpha sequence shared 77, 77, 77, 74, 71, 65 and 57% similarity with the bovine, ovine, porcine, equine, feline, human and mouse IL-1alpha sequences, respectively. Similarly, the amino acid sequence showed that dolphin IL-1beta shared 77, 77, 74, 69, 65, 64 and 63% similarity with the bovine, ovine, porcine, equine, feline, human and mouse IL-1beta sequences, respectively. The relatedness of dolphin IL-1alpha and IL-1beta were relatively distant with 21% amino acid homology.

Amino Acid Sequence↗

Cloning and sequencing of a bottle-nosed dolphin (Tursiops truncatus) interleukin-4-encoding cDNA.

Using polymerase chain reaction (PCR), a bottle-nosed dolphin (Tursiops truncatus) interleukin-4 (IL4) cDNA was cloned and sequenced. IL4 specific primers were based on the 5' and 3' untranslated regions of the human and murine IL4 gene. The dolphin IL4 cDNA is 528 base pairs in length and contains an open reading frame of 402 nucleotides coding an IL4 precursor of 133 amino acids, with the putative signal peptide of 24 amino acids. Analysis of the mature amino acid sequence shows three potential N-linked glycosylation sites and three disulfide bonds. Comparison of the predicted amino acid sequence shows that dolphin IL4 shares 77, 74, 58 and 41% identity with the bovine, ovine, human and mouse IL4s, respectively.

Amino Acid Sequence↗

Cloning and sequencing of the bottle-nosed dolphin (Tursiops truncatus) interferon-gamma gene.

The bottle-nosed dolphin (Tursiops truncatus) interferon-gamma(IFN-gamma) cDNA was cloned from mitogen stimulated peripheral blood mononuclear cells (PBMC) RNA utilizing the reverse transcription-polymerase chain reaction (RT-PCR). The dolphin IFN-gammacDNA was 585 base pairs in length and contained an open reading frame of 498 nucleotides encoding an IFN-gammaprecursor of 166 amino acids, with cleavage of the putative signal peptide of 19 amino acids. Analysis of the mature amino acid sequences revealed two potential N-linked glycosylation sites. Comparison of the predicted amino acid sequence showed that dolphin IFN-(gamma)shares 86, 85, 63 and 42% similarity with the bovine, ovine, human and mouse IFN-gamma, respectively.

Amino Acid Sequence↗

Metabolite analysis of [11C]flumazenil in human plasma: assessment as the standardized value for quantitative PET studies.

Analysis of carbon-11 labeled metabolites in plasma was carried out during positron emission tomography (PET) studies with a central benzodiazepine receptor ligand [11C]flumazenil ([11C]FMZ) in 24 human subjects (14-76 y.o.) including five normal volunteers and 19 patients with neurological disorders. Arterial plasma samples were obtained at 3, 5, 10, 15, 20, 30 and 60 min after i.v. injection of the tracer, and were analyzed by high-performance liquid chromatography. The rate of plasma [11C]FMZ degradation was associated with a large individual variation, but no significant difference was found in the degradation of [11C]FMZ either between male and female, young and old, or between normal subjects and patient groups. When the mean fraction of unchanged [11C]FMZ at each time point was used instead of individually measured metabolite data for the arterial input function, as much as a 30% error occurred in the distribution volume of the [11C]FMZ binding in the brain. These results indicate that the mean percentage of unchanged [11C]FMZ fraction in subjects cannot be used as the standardized value, and that the analysis of metabolites in plasma is necessary to determine the exact arterial input function for quantitative PET measurement.

Adolescent↗

Recombinant adeno-associated virus-mediated gene transfer into human leukemia cell lines.

Adeno-associated virus (AAV)-based vector is a promising gene transfer vehicle by virtue of the characteristics of wild-type AAV:tropism to a wide range of human tissues and locus-specific integration at chromosome 19q13.3. To elucidate the nature of the recombinant AAV (rAAV), transduction of neomycin phosphotransferase enzyme gene (NeoR gene) into seven human leukemia cell lines was performed. Transduction efficiencies were assessed by colony formation assay and limiting dilution assay. The results suggested that both assays are comparable. Transduction efficiencies of the NeoR gene into K-562, MEG-O1, Raji, MOLT-3, HL-60, U937 and NKM-1 at a multiplicity of infection (MOI) of 0.1 were 0.27, 0.25, 0.015, 0.009, < 0.0025 and < 0.0025%, respectively. After purification and concentration of rAAV, 27% efficiency was observed in K562 at an MOI of 7 and a linear relationship between MOI and efficiency was confirmed, suggesting that this system may be useful for gene transduction into leukemia cells. Integration of the NeoR gene into the host genome was detected by Southern blotting analysis, which showed various sizes of digested fragments. A fluorescent in situ hybridization (FISH) study was carried out on 11 clones, in all of which the NeoR gene was integrated out of chromosome 19q13.3. In five of the clones, whole chromosome painting probes revealed that the integration sites were chromosomes 1q, 2q, 2q, 11p, 12p and 13q.

Dependovirus↗

Cardiovascular effects of (2RS,3SR)- 2-aminomethyl-2,3,7,8-tetrahydro-2,3,5,8,8-pentamethyl-6H-furo- [2,3-e]indol-7-one hydrochloride (UK-1745), a novel cardiotonic agent with vasodilatory and antiarrhythmic properties.

The cardiovascular effects of (2RS,3SR)-2-aminomethyl-2,3,7,8- tetrahydro-2,3,5,8,8-pentamethyl-6H-furo[2,3-e]indol-7-one hydrochloride (CAS 170684-14-7, UK-1745), a novel cardiotonic agent, were investigated using in vitro and in vivo preparations. In paced left atria isolated from guinea pigs, both UK-1745 and vesnarinone (CAS 81840-15-5) showed a concentration-dependent positive inotropic effect. In spontaneously beating guinea pig right atria, both agents caused only a minimal chronotropic effect. In isolated, blood-perfused canine papillary muscle preparations, UK-1745 and vesnarinone injected intra-arterially into the anterior septal artery (ASA) increased the developed tension in a dose-dependent manner. In isolated, blood-perfused canine sinoatrial node preparations, both agents injected into the right coronary artery (RCA) did not cause any appreciable changes in the sinus rate. UK-1745 increased the blood flow through the ASA and the RCA in a dose-dependent manner, whereas vesnarinone did not. In anesthetized open-chest dogs, UK-1745 injected intravenously increased cardiac contractility and cardiac output, and decreased left ventricular end-diastolic pressure, systemic vascular resistance and heart rate. In experimentally induced acute heart failure in anesthetized open-chest dogs, intravenously injected UK-1745 effectively improved hemodynamic functions. In conscious instrumented dogs, orally administered UK-1745 increased LV dP/dtmax with insignificant changes in systemic blood pressure and heart rate. In mice, orally administered UK-1745 protected the development of ventricular fibrillation induced by chloroform inhalation, whereas vesnarinone did not. Thus, in respect of inotropic and chronotropic effects, UK-1745 closely resembled vesnarinone, but differed from vesnarinone in respect of coronary vasodilating and antiarrhythmic effects. The results suggest that UK-1745 is a novel positive inotropic agent with vasodilatory and antiarrhythmic properties, without significant chronotropic action, and may be beneficial for the treatment of congestive heart failure.

Anesthesia↗

Functional expression of Fas (CD95) in acute myeloid leukemia cells in the context of CD34 and CD38 expression: possible correlation with sensitivity to chemotherapy.

Clinical studies of bone marrow transplantation (BMT) suggest that the immune system contributes to the eradication of acute myeloid leukemia (AML). A recent study also showed that the Fas (CD95/APO1) mediates apoptotic signal from cytotoxic T lymphocytes. Sixty-four patients with AML were studied for the expression of Fas in the context of CD34 and CD38 coexpression. The clinical relevance of Fas expression and function on AML was also investigated. Fas was expressed on 2% to 98% of AML cells (2% to 20% in 11 patients, 20% to 50% in 20 patients, 50% to 80% in 24 patients, and 80% to 98% in nine patients). Only 44.4% of patients with AML M1 (French-American-British [FAB] classification) were Fas+ (>/=20% of leukemia cells expressed Fas), whereas 89.1% of patients with AML M2, M3, M4, M5 were Fas+ (P < .01). Among 43 CD34+ patients (>/=20% leukemia cells were CD34+), 34 were Fas+, and 19 of 21 CD34- patients were Fas+ (P = NS). Thirteen cases were studied for their expression of Fas in the context of CD34 and CD38 using three-color analysis. Fas is expressed at a high level in the gated CD34+CD38+/- and CD34+CD38+ population. In 10 AML samples, Fas was expressed at a higher level in CD34+/CD38+ population than in CD34+/CD38+/- or CD34- cell populations. Fas-induced apoptosis by anti-Fas monoclonal antibody (MoAb) was determined by morphologic features and colorimetric DNA fragmentation assay. Induction of apoptosis was found in 14 of 24 cases. However, no statistically significant correlation was observed between Fas expression and induction of apoptosis. Leukemia colony-forming unit assays suggested that in some cases, Fas-induced apoptosis occurred in the clonogenic cell populations. Parameters such as laboratory and clinical data at initial diagnosis were correlated with Fas expression and only response to initial induction chemotherapy showed significant correlation with Fas expression (P < .05). We conclude that the majority of AML cells exhibit variable expression of Fas, and apoptosis could be induced by anti-Fas MoAb in some cases. Our results suggest the Fas-mediated apoptosis may be clinically relevant, whereas the issue of clonogenic leukemia cells and Fas expression needs further studies.

ADP-ribosyl Cyclase↗