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Biomedical subjects

Y Umeki

Publications and source records attributed to Y Umeki.

12 recordsLinked to original sources
PubMed2000

HGF/SF-induced spreading of MDCK cells correlates with disappearance of barmotin/7H6, a tight junction-associated protein, from the cell membrane.

Changes in expression of the two tight junction-associated proteins, barmotin/7H6 and ZO-1, as well as the adherence junction-associated protein, E-cadherin, were followed during hepatocyte growth factor/scatter factor (HGF/SC)-induced migration process of MDCK cells. Modulation of the HGF/SF-induced migration process by staurosporine, an inhibitor of protein kinase C (PKC), was also examined. Cell migration induced by HGF/SF consisted of two distinct phases, initial cell spreading between 2 and 9 h after the start of treatment, and the scattering phase which started approximately 12 h after treatment. Both ZO-1 and E-cadherin were expressed at the cell-cell border of adherent cells in the scattering phase, whereas barmotin/7H6, a barrier function-related tight junction protein, was not seen during the early spreading phase. Confluent cultures of MDCK cells, which did not spread after HGF/SF treatment, were positive for barmotin/7H6 expression at cell-cell borders. Blocking PKC activation during HGF/SF treatment with staurosporine inhibited cell spreading, and the cells retained barmotin/7H6 expression until at 6 h after HGF/SF treatment. The results indicate that disappearance of the tight junction protein, barmotin/7H6, is closely associated with cell spreading, with both barmotin/7H6 expression and cell spreading seemingly being regulated by PKC-mediated signaling.

Animals↗
PubMed2000

Plasma levels of granulocyte elastase-alpha1-proteinase inhibitor complex in children with hemolytic uremic syndrome caused by verotoxin-producing Escherichia coli.

BACKGROUND: Activated neutrophils play an important role in the pathogenesis of renal injury in humans and in experimental models of hemolytic uremic syndrome (HUS). To evaluate the clinical significance of the circulating granulocyte elastase-alpha1-proteinase inhibitor complex (GEPIC), which is a marker of neutrophil activation, we investigated the plasma concentrations of GEPIC in children with hemolytic uremic syndrome (HUS) associated with verotoxin-producing Escherichia coli (VTEC), VTEC gastroenteritis without HUS and in normal controls. METHODS: Of 22 children (1-19 years of age; mean age 5.5 years) with VTEC infection, nine were diagnosed with HUS. Plasma GEPIC, soluble thrombomodulin (sTM) and thrombin-antithrombin-III complex (TAT) levels were measured by ELISA. RESULTS: The number of polymorphonuclear leukocytes and the levels of plasma GEPIC in patients with HUS were significantly higher than those in non-HUS (9850+/-5091 vs. 5278+/-3327 /microL, P<0.05; 432.1+/-211.7 vs. 188.3+/-117.0 ng/mL, P<0.01) or control subjects (9850+/-5091 vs. 4728+/-1977 /microL, P<0.05; 432.1+/-211.7 vs. 105.9+/-51.1 ng/mL, P<0.001). Furthermore, plasma GEPIC levels showed a positive correlation with sTM (r = 0.522; P<0.01), a marker of endothelial cell injury, and TAT (r = 0.594; P<0.01), a marker of thrombin activity. CONCLUSIONS: These results suggest that an increase in circulating GEPIC levels in patients with VTEC-associated HUS may be related to endothelial injury, which may possibly lead to a more severe episode of this disease.

Adolescent↗
PubMed2000

Elevated tissue factor circulating levels in children with hemolytic uremic syndrome caused by verotoxin-producing E. coli.

BACKGROUND: Microvascular thrombosis in the kidney plays an important role in the pathogenesis of hemolytic uremic syndrome (HUS). Tissue factor (TF), present on the vascular surface of endothelial cells, binds factor VIIa. The complex initiates the coagulating cascade by activating factors X and IX. PATIENTS AND METHODS: In cases of HUS associated with verotoxin-producing E. coli (VTEC) infection, VTEC gastroenteritis without HUS and normal controls, we measured plasma concentrations of TF and tissue factor pathway inhibitor (TFPI) to evaluate their clinical significance. In children with non-HUS chronic renal failure (CRF), the TF levels were also measured as another control group. RESULTS: In the acute phase of HUS, plasma levels of TF and TFPI were significantly elevated, then returned to normal range in the recovery phase. The TF levels were closely correlated with the thrombin antithrombin-III complex, a marker of thrombin activity in circulating blood, and with creatinine clearance (Ccr). Furthermore, a positive correlation was noted between plasma TF levels and plasma soluble thrombomodulin (sTM) levels, which is a marker of endothelial cell injury. The influence of decreased excretion from damaged kidneys should be considered since a definite lot correlation was observed between plasma TF levels and Ccr in children with non-HUS CRF. CONCLUSION: From these findings, we concluded that elevated TF circulating levels may also play an important role in blood-clotting activation observed in VTEC-HUS patients, and may also be a useful marker for renal damage.

Case-Control Studies↗
PubMed1996

Alpha-fetoprotein, carcinoembryonic antigen, and carbohydrate antigen 19-9-producing gallbladder cancer.

We report a rare case of alpha-fetoprotein (AFP), carcinoembryonic antigen (CEA), and carbohydrate antigen (CA) 19-9-producing gallbladder cancer with high levels of CA125 and protein induced by vitamin K absence or antagonist II (PIVKA II). A 63-year-old man was diagnosed with gallbladder cancer with metastases to the liver, based on ultrasonography and computed tomography of the abdomen showing multiple tumorous lesions in the liver and a thickened gallbladder wall. Laboratory data showed high levels of tumor markers: 4647.4 ng/ml AFP, 9987.1 ng/ml CEA, 11,704.0 U/ml CA19-9, 847.6 U/ml CA125, and 0.2 AU/ ml PIVKA II. AFP in the present case showed an increase in Concanavalin A-nonbinding fraction and an increase in Lens culinaris lectin-binding fraction by affinity column chromatography. The patient died of hepatic failure. Autopsy revealed gallbladder cancer consisting of papillary adenocarcinoma and moderately differentiated tubular adenocarcinoma. By immunohistochemical staining, AFP was detected in the papillary adenocarcinoma portion of the primary focus and metastatic tumor cells in the liver, but was not detected in noncancerous liver tissue. CEA and CA19-9 were detected mainly in the tubular adenocarcinoma portion.

Antigens, Tumor-Associated, Carbohydrate↗
PubMed1991

[Static results of medial foot arch].

The purpose of this study was to examine the factors which influence on the length of the medial arch of the foot. The length of the medial arch was measured by using the electric arch gauge in ten normal adults under various situation, such as, under vertical load from the knee to the foot, under weight-bearing on both-legs standing, on one-leg standing with and without support, at the dorsiflexion of first metatarsophalangeal joint, and during the inversion-eversion and adduction-abduction of the foot. The medial arch lengthened by vertical load to the foot, and abduction of the foot. On the other hand, shortening was observed on one-leg standing without support on the dorsiflexion of the first metatarsophalangeal joint and on the adduction of the foot. These results indicate that the participation of these factors may be necessary for smooth walking.

Adult↗
PubMed1990

[Blood gas disorders during one lung ventilation and the efficacy of the monitors].

The incidence and the causes of the abnormal blood gas levels were analysed with 188 patients who had one lung ventilation during general anesthesia, and the monitors to detect such complications were discussed. Abnormal blood gas levels were detected in 47 patients (25%), and 6 of 47 patients had dislocation of endotracheal tube or cuff. There was one patient who suffered from severe blood gas disorder due to the total occlusion of trachea by cuff herniation. Forty one cases (41.8%) had abnormal blood gas levels even though there was no dislocation of endotracheal tube or cuff. In these patients the blood gas abnormalities were mild and transient. These data suggest that mild blood gas disorders were relatively easily detected with pulse oximeters and capnography. However, serious disorders were not detected with these monitors if the anesthesiologists were not familiar with these equipment.

Adolescent↗
PubMed1990

Levels of acarboxy prothrombin (PIVKA-II) and coagulation factors in warfarin-treated patients.

PIVKA-II (protein induced by vitamin K absence or antagonists-II) was determined and compared with other coagulation factors in normal subjects and patients treated with the anticoagulant warfarin. In 18 (60%) of 30 patients treated with warfarin, PIVKA-II values were 1 microgram/ml or more, although they were less than 1 microgram/ml in all 39 normal subjects (100%). In patients treated with warfarin, values of prothrombin time and partial thromboplastin time were significantly higher than those in normal subjects. However, values of hepaplastintest (normotest) and thrombotest in the patients were greatly lower than those in normal subjects. There were no significant differences between bleeding time or plasma fibrinogen values in the patients and normal subjects. The values of PIVKA-II were inversely correlated (P less than 0.01) with those of hepaplastintest and thrombotest. The measurement of PIVKA-II in the plasma should be useful in detecting vitamin K-deficient status among haemorrhagic disorders.

Biomarkers↗
PubMed1987

New method for cardiac transplantation.

Rat cardiac transplantation into the femoral region has several advantages compared to cardiac transplantation into the peritoneal cavity. These advantages include increased speed, decreased hypothermia of the recipient, and easier-access palpation. However, there is a major discrepancy in the size of the donor and recipient vessels. The donor aorta is two to three times larger than the recipient's femoral artery and thus could be a contraindication to the transplant. To circumvent this problem, we anastomosed the donor's aorta with the recipient's femoral artery by an end-in-end technique whereas the donor's pulmonary artery was anastomosed by conventional end-to-end technique with the recipient's femoral vein. The excess wall of the donor's vessel was plicated on a slant for each anastomosis. Our results compare favorably to those of techniques established previously. We suggest that this new method of cardiac transplantation will be of great value in the study of immunological events involved in graft rejection.

Anastomosis, Surgical↗