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Biomedical subjects

H Tanabe

Publications and source records attributed to H Tanabe.

At least 73 records · Page 4Linked to original sources
PubMed2000

Elevation of tail skin temperature in ovariectomized rats in relation to menopausal hot flushes.

Menopausal hot flushes (HFs), which manifest as an increase in skin temperature, most frequently occur after menopause and cease with the passage of time. We designed this study to elucidate the characteristics of the elevation of tail skin temperature (TST) in ovariectomized (OVX) rats, which is relevant to human symptoms of HFs. First, we measured TST and rectal temperature (RT) and investigated the time course of their changes up to 20 wk after ovariectomy. The TST in OVX rats (28.4 +/- 0.3 degrees C) was significantly (P = 0.0035) elevated from 2 to 7 wk after the ovariectomy compared with that in sham-operated (Sham) rats (27.0 +/- 0.2 degrees C), whereas the RT in OVX rats was elevated from 8 to 20 wk. We next examined the therapeutic effects of estradiol (E(2)) on the elevation of the TST by continuous subcutaneous infusion. E(2) treatment (1.0 microg/day) completely (P = 0.0232) inhibited the elevation of the TST (28.4 +/- 0.3 degrees C for Sham rats, 29.3 +/- 0.3 degrees C for OVX rats, 28.2 +/- 0.4 degrees C for OVX + E(2) 1.0 microg/day rats). These results demonstrated that the elevation of TST in OVX rats was exhibited soon after the estrogen removal and diminished with time and that it was normalized with continuous E(2) replacement. These characteristics are similar to the symptoms of menopausal HFs in women.

Animals↗
PubMed2000

Global myocardial ischemia as a complication of an acute type A aortic dissection--rapid diagnosis of a case by transesophageal echocardiography.

A 36-year-old female was admitted for severe chest pain followed by profound shock. Electrocardiography showed severe ST segment depression (0.5-0.7 mV) in all leads except aVR and aVL. Echocardiography revealed an intimal flap in the ascending aorta and coexisting grade 3 aortic regurgitation. She was immediately intubated and transferred to the intensive care unit. Transesophageal echocardiography (TEE) demonstrated an intimal tear at 2 cm above the sinotubular junction, and the ostium of the left main trunk was oppressed by the intimal flap during diastole. Emergency graft replacement of the ascending aorta and aortic hemiarch concomitant with aortic valve resuspension was performed successfully. The ECG changes reversed to normal immediately after the operation. The patient was extubated 2 days postoperatively and discharged from the hospital 14 days postoperatively. TEE is useful for the rapid evaluation of coronary malperfusion as a complication of acute aortic dissection, especially in patients with hemodynamic instability.

Acute Disease↗
PubMed2000

Transcription of emrKY is regulated by the EvgA-EvgS two-component system in Escherichia coli K-12.

Spontaneous mutations have been isolated in Escherichia coli that result in the constitutive expression of an emrKY promoter. These mutations were found to be single-nucleotide substitutions within the linker region of the sensor protein EvgS, which is part of a two-component regulatory system along with EvgA. In the linker mutants (evgSI and evgS4), emrKY expression became constitutive and MIC against sodium deoxycholate was 20 mg/ml, eight-fold higher than in the wild type. Furthermore, the start site of transcription from the promoter of emrKY was identified; EvgA was shown to bind at the -52 to -84 region by the footprinting experiment.

Amino Acid Sequence↗
PubMed2000

Identification and characterization of a potent antibacterial agent, NH125 against drug-resistant bacteria.

New imidazole compounds were synthesized to develop a novel and effective antibacterial agent (1-benzyl-3-cetyl-2-methylimidazolium iodide, NH125). In vitro experiments demonstrated that NH125 effectively inhibited a number of different histidine protein kinases. Furthermore, oxacillin-resistant Staphylococcus aureus (ORSA), vancomycin-resistant Enterococcus faecalis (VRE), penicillin-resistant Streptococcus pneumoniae (PRS), and other Gram-positive and Gram-negative bacteria were found to be very sensitive to NH125.

Anti-Bacterial Agents↗
PubMed2000

Multiseptate gallbladder with cholelithiasis diagnosed incidentially in an elderly patient.

A 70-year-old woman with rheumatoid arthritis was admitted to our hospital because of gastric ulcers. Abdominal echography incidentally revealed that the patient's gallbladder was multiseptate, an extremely rare anomaly. The diagnosis was confirmed by endoscopic retrograde cholangiography. This is the 26th case of multiseptate gallbladder in the world literature, but the patient is the oldest yet recorded with this condition. Furthermore, unlike most patients with multiseptate gallbladder, she had no biliary symptoms with concomitant cholelithiasis.

Aged↗
PubMed2000

Effects of progesterone on the elevation of tail skin temperature in ovariectomized rats.

We examined the effects of progesterone on the elevation of tail skin temperature (TST) in ovariectomized rats and compared them with those of estradiol. Progesterone showed only insignificant effects on the TST elevation, whereas estradiol showed complete inhibition. The TST elevation induced by ovariectomy is caused by estradiol deficiency, but progesterone plays little or no role.

Animals↗
PubMed2000

[Neuropsychology of frontal type dementia].

The clinical conceptual change in frontal type dementia is reviewed in discussing its relationships to several related concepts such as Pick's disease, frontotemporal dementia (FTD), semantic dementia (SD) and frontotemporal lobar degeneration. We analyzed frontal type dementia selected from a consecutive series of our outpatients as to the details of neuropsychological symptoms, psychiatric symptoms, and abnormal behaviors. In our series of 143 patients with primary degenerative dementia, there were 16 cases of FTD and 6 cases of SD. Patients with two types of FTD and patients with SD were not distinguishable by neuropsychological examinations, behavioral abnormalities and psychiatric symptoms assessed with the Neuropsychiatric Inventory except for aphasia. The clinical picture of frontal type dementia involves frontal lobe symptoms such as disinhibition, apathy and stereotypy. Semantic memory loss for words, objects or faces suggestive of temporal lobe involvement developed only in patients with SD, and not in patients with FTD. Certain behavioral symptoms seen in frontal type dementia may respond to selective serotonin reuptake inhibitors. In care for patients with frontal type dementia, behavioral disturbances can be diminished and the quality of life can be improved by using their preserved procedural memory, pathological stereotypic behavior and stimulus-bound behavior such as utilization behavior and environmental dependency syndrome.

Dementia↗
PubMed2000

The use of a novel tissue sealant as a hemostatic adjunct in cardiac surgery.

BACKGROUND: In spite of advances in the management of bleeding associated with cardiac surgery, hemorrhage remains a troublesome problem, particularly in complex cases and high risk patients. In minimally invasive cardiac surgery, limited exposure and tight quarters may make accurate suturing difficult, and increase the risk of surgical bleeding. A surgical sealant that effectively prevents suture line bleeding would be a valuable resource for cardiac surgeons and might help to facilitate minimal access cases. METHODS: We undertook acute canine studies with a new polyethylene glycol-based tissue sealant (FocalSeal, Focal, Inc., Lexington, MA) to determine its effectiveness in controlling bleeding from graduated needle punctures sites in the arteries of heparinized animals. For chronic canine studies, the sealant was applied to the suture line of a left internal mammary artery (LIMA) to left anterior descending (LAD) anastomoses. The anastomoses were then evaluated for patency and tissue reaction after a three-month recovery period. RESULTS: The sealant prevented bleeding from arterial puncture wounds up to 2.5 mm in diameter. Three months following the application of sealant to coronary anastomoses, no adverse tissue reaction was found on histologic examination. All anastomoses treated with the sealant remained patent. CONCLUSION: When applied as a hemostatic adjunct to sutures at a coronary anastomosis, the sealant appears to be an effective means of preventing bleeding without adverse tissue reaction or scarring.

Anastomosis, Surgical↗
PubMed1999

Localization of syndecan-1 in human gastric mucosa associated with ulceration.

Syndecans, cell surface heparan sulphate proteoglycans, are known to function as cell adhesion molecules and as a co-receptor for heparin-binding growth factors that have important roles in tissue homeostasis and repair, but the localization of syndecans in gastric mucosa and their role in gastric ulcer healing are not known. The licalization of syndecan-1, a subfamily protein of syndecans expressed on epithelial cells, was studied in 12 surgically resected human stomachs containing an ulcer or early scar tissue. Localization of syndecan-1 was detected both by immunohistochemistry and by in situ hybridization In non-ulcer sites of gastric mucosa, syndecan-1 protein was expressed at the basolateral surface of foveolar epithelial cells and the cells of intestinal metaplasia, and at the cell surface of stromal plasma cells. In addition, positive dots of syndecan-1 were found in the cytoplasmic area of parietal cells. Foveolar epithelial cells at active stage ulcer margins showed nearly the same intensity of staining as those at non-ulcer site mucosa. By contrast, enhanced staining was obtained in elongated regenerative foveolar cells at the healing ulcer margins and the early scar tissues. The migrating cells on ulcer floors also expressed syndecan-1 protein. The expression sites of syndecan-1 mRNA mostly coincided with those of syndecan-1 protein. These results suggest that syndecan-1 participates in cell adhesion mainly at the foveolar epithelium and plays a role in the healing of gastric ulcers by interacting with heparin-binding growth factors.

Gastric Mucosa↗
PubMed1999

Spectra of gpt mutations in ethylnitrosourea-treated and untreated transgenic mice.

We have established a new transgenic mouse mutagenicity assay for the efficient detection of point mutations and deletions in vivo (Nohmi et al. [1996] Env. Mol. Mutagen. 28:465-470). In this assay, the gpt gene of Escherichia coli is used as a reporter for the detection of point mutations. Treatment of mice with ethylnitrosourea (ENU, 150 mg/kg) enhances by several-fold the mutant frequency of gpt in bone marrow. Here, we report the mutation spectra of the gpt gene recovered from bone marrow of ENU-treated and untreated transgenic mice. In the gpt mutants rescued from ENU-treated mice, more than 90% of the mutations were base change mutations; the predominant types were A:T to T:A transversions and G:C to A:T transitions. On the contrary, in the mutants rescued from untreated mice, 54% were base substitutions and the remainders were short deletions and insertions. Among untreated mice, the most frequently observed base substitution was G:C to A:T transitions (7/14 mutants). Three of these occurred at 5'-CpG-3' sites. Interestingly, the mutation spectra of the gpt gene were different from those of the gpt gene in ENU-treated and untreated E.coli, whereas they were similar to those of the lacZ and lacI genes in ENU-treated and untreated other transgenic mice or cultured mammalian cells. We also report the establishment of homozygous transgenic mice that have transgene lambdaEG10 DNA in both chromosome 17 of C57BL/6J mouse.

Animals↗
PubMed1999

Differential production of MCP-1 and cytokine-induced neutrophil chemoattractant in the ischemic brain after transient focal ischemia in rats.

Chemokines have been shown to play an important role in leukocyte infiltration into ischemic lesions. Recently, the increased expression of monocyte chemoattractant protein-1 (MCP-1) and cytokine-induced neutrophil chemoattractant (CINC) was observed in experimental stroke models where infiltrated leukocytes were supposed to induce tissue injury, however, the protein level and time course of these chemokines have not been fully elucidated. Therefore, we analyzed the time-dependent production of MCP-1 and CINC in the rat brain after transient middle cerebral artery occlusion (MCAO) by means of specific enzyme-linked immunosorbent assay systems. The MCP-1 levels in the ipsilateral hemispheres increased from 6 h, peaked at 2 days, and thereafter gradually decreased. The peak MCP-1 concentration was 89.2+/-28.2 ng/g tissue wet weight (mean +/- SEM, n = 5, 49.3-fold greater than the contralateral value at the same time, P < 0.05), which is supposed to be high enough to exert its biological effects. In contrast, the maximum CINC concentration that corresponded to 2.9+/-0.7 ng/g tissue wet weight (mean +/- SEM, n = 5, 55.0-fold greater than the contralateral value at the same time, P < 0.05), was observed at 6 h. In addition, we confirmed the temporal profile of leukocyte subtypes that infiltrated into the ischemic brain, thus, neutrophil infiltration occurred at early stages (1-3 days), followed by massive infiltration of macrophages at later stages (2-7 days). These studies suggest that MCP-1 in cerebral ischemia actually plays a significant role in the migration of macrophages into the lesion and that the differential temporal production of these chemokines contributes to the regulation of infiltrated leukocyte subtypes.

Animals↗
PubMed1999

Polymorphisms of the human homologue of the Drosophila white gene are associated with mood and panic disorders.

The Drosophila white gene is a member of the ATP-binding cassette (ABC) transporter superfamily and is involved in the cellular uptake of tryptophan. Its human homologue gene (hW) has been mapped to chromosome 21q22.3. Tryptophan is the precursor for the neurotransmitter serotonin, which has been implicated in the regulation of mood and anxiety. The locus 21q22.3 has also been reported to be associated with mood disorders. The 3'-untranslated region (3'-UTR) in the hW gene has been shown to contain a polymorphic poly(T) region. We have identified a new polymorphism G2457A in the 3'-UTR in the present study. We examined the relationship between these polymorphisms and mood and panic disorders, and a significant association between the poly(T) polymorphisms and mood disorders was detected (P=0.039 (allele frequency)). Associations were found between the polymorphisms and mood (poly(T) polymorphism: P=0.047 (allele frequency), G2457A: P=0.040 (allele frequency), P=0.044 (genotype frequency)) and panic disorders (G2457A: P=0.026 (allele frequency), P=0.011 (genotype frequency)) in males, but not in females. These findings suggest that the hW gene may be an important gene in the control of mood and anxiety as well as one of the genetic factors related to mood disorders and panic disorder in males. The statistical significance of the association remains relatively low and larger materials facilitating further dissection of the clinical phenotype will be needed to confirm and independently validate this finding and to evaluate its significance.

3' Untranslated Regions↗
PubMed1999

Identification of a novel polymorphism of the human dopamine transporter (DAT1) gene and the significant association with alcoholism.

Human dopamine transporter gene (DAT1) has a variable number of tandem repeats (VNTR) in its 3'-untranslated region (UTR). The association between the VNTR polymorphism and neuropsychiatric disorders has been studied, but their relationship is still unclear. Here we identified a novel polymorphism in the 3'-UTR of the DAT1 gene, G2319A, and a significant association between the polymorphism and alcoholism was observed in both genotypic and allelic frequencies (P = 0.040 and 0.019, extended Fisher's exact test, respectively). There was a significant gene dose effect on the risk for alcoholism associated with the 2319-A allele (chi2 = 6.16, df = 2, P = 0.046, linearity tendency test: Cochranq-Armitage analysis). Moreover, in the haplotype analysis with G2319A- and VNTR-polymorphisms, a positive gene dose efffect on the risk with the A10 allele (P = 0.044, linearity tendency test) and a negative gene dose effect with the G10 allele (P = 0.010, linearity tendency test) for alcoholism were significantly detected. Odds ratio for alcoholism with the A10 and G10 alleles were 1.76 (1.12-2.76) and 0.53 (0.32-0.79), respectively. These results indicate that the DAT1 gene may confer vulnerability to alcoholism.

3' Untranslated Regions↗
PubMed1999

What prevents Japan from establishing a clinical service of sleep medicine: experience gained at a local hospital.

We opened a mini-sleep disorders clinic in a local general hospital in rural Japan, and have been operating it for more than 3 years. We encountered many difficulties during this period when we tried to provide proper clinical service. Problems ranged from lack of sleep specialists and polysomnography technicians, shortage of funding, non-existence of an educational system to obtain comprehensive knowledge about sleep medicine, and also lack of cooperation among different departments necessary for maintaining clinical service. Through our experience, we analyzed various factors that prevent Japan from establishing a clinical service of sleep medicine.

Health Planning↗