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Biomedical subjects

M Umeda

Publications and source records attributed to M Umeda.

At least 361 records · Page 20Linked to original sources
PubMed1990

Effectiveness of taurine in protecting biomembrane against oxidant.

The effect of taurine in protecting biomembrane attacked by hypochlorous acid (HOCl) was examined using canine erythrocytes which had been pre-treated with HOCl. In the treatment, most of the HOCl was consumed as a result of its reaction with a number of electrophilic substances, such as free amino groups (-NH2) in the membrane, whereas hemoglobin inside the cells was not oxidized. The lysis of HOCl-treated erythrocytes was dependent on the concentration of HOCl and on the incubation time at 37 degrees C. Taurine inhibited the lysis at 37 degrees C in a dose dependent manner. During the incubation of HOCl-treated erythrocytes with taurine, an appreciable amount of monochlorotaurine (TauNHCl) was detected in the supernate. This suggests that taurine might remove the oxidized chlorine from HOCl-treated erythrocytes, resulting in the production of TauNHCl. The effect of taurine on the removal of Cl+ moiety was further examined using Sepharose gel with free amino groups. Taurine removed Cl+ moiety from HOCl-treated Sepharose gel, and the yield of TauNHCl depended on the concentration of taurine and the incubation time. These results indicate that taurine might inhibit the hemolysis by scavenging the oxidized chlorine moiety from the HOCl-treated erythrocytes. Inhibition of the HOCl-induced hemolysis was also observed with other amino acids.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1990

Novel endotoxin adsorbing materials, polymyxin-sepharose and polyporous polyethylene membrane for removal of endotoxin from dialysis systems.

In order to remove contaminated endotoxin from dialysis systems, we prepared and investigated two novel endotoxin adsorbing materials, Polymyxin-Sepharose (PxSeph) and polyporous polyethylene hollow fiber membrane (EHF). PxSeph was prepared by covalently immobilizing polymyxin B on Sepharose 4B beads by CNBr coupling method. It adsorbed various endotoxins with a high affinity constant and could effectively remove endotoxin from aqueous solution and human plasma. EHF also removed endotoxins from contaminated water by filtration through EHF modules, and its adsorption nature was demonstrated. Both PxSeph and EHF are stable in physiological conditions and proved to be useful adsorbents for removal of contaminated endotoxin from the hemodialysis systems.

Adsorption↗
PubMed1990

[Clinical, bacteriological, and immunological examination and treatment of two Papillon-Lefevre syndrome patients].

Papillon-Lefèvre Syndrome (PLS) is a rare disease accompanied by palmo-plantar hyperkeratosis and rapidly progressive periodontal breakdown of deciduous and permanent dentition. Two unrelated female PLS patients, four and seven years old, with severe periodontal destruction were examined. Antibody titers against seven strains by the enzyme-linked immunosorbent assay (ELISA), microbial cultures from deep periodontal pockets and mouth rinse samples and immunoblotting analysis were performed. Titers against Actinobacillus actinomycetemcomitans (A.a.) were found to be high by the ELISA test. Microbial cultures of A. a. were found in high percentage and immunoblotting results against sonicated extracts of an A. a. Y4 strain had similar patterns. All deciduous teeth were extracted from the younger patient, later permanent dentition erupted uneventfully and A. a. colonies could not be detected. However, the older patient did not exhibit improvement with conventional periodontal therapy and antibiotic (minocycline/erythromycin) treatment and A. a. colonies could be consistently cultured. After a subsequent ofloxacin medication, A. a. colony detection was suppressed. Furthermore, a reduction of gingival inflammation and pocket depth were observed. Therefore, A. a. was associated as an important pathogen in the etiology of periodontal disease in these PLS patients.

Actinobacillus↗
PubMed1990

[The COP-BLAM therapy for malignant lymphoma].

COP-BLAM therapy, which has recently been reported to be useful in the treatment of malignant lymphoma, was performed on 36 patients, and the results and adverse effects of treatment were evaluated. Complete remission (CR) and partial remission (PR), was obtained in 32 (88.9%) and in 4 (11.1%) out of the 36 patients, respectively. So the effective ratio was 100%. Analyzing results according to staging classification, CR was obtained in all of those in stages I and II, and in 84% of those in stages III and IV. The four patients with recurrent disease after CHOP therapy exhibited a CR ratio of 50% indicating that therapy is effective in recurrent cases. Adverse effects observed among the patients included leukocytopenia under 1,000/microliters (5.6%), thrombocytopenia under 5 x 10(4)/microliters (2.8%), gastrointestinal symptoms (25%), peripheral neuropathy (8.3%) and alopecia (27.3%). The efficacy of COP-BLAM therapy appears to be satisfactory with malignant lymphoma, and all adverse effects were of mild degree. In addition, it may be effective in the treatment of recurrent cases which remitted after CHOP and other therapies.

Adult↗
PubMed1990

[Massive bilateral non-Hodgkin's lymphoma of the adrenal glands].

The patient was a 47-year-old male who attended our hospital complaining of back pain. Masses in the bilateral adrenal glands were noted on abdominal ultrasonography and the patient was admitted to the hospital on August 9, 1988. Upon test laparotomy, non-Hodgkin's lymphoma (diffuse small-cell type, B-cell type) was diagnosed, and endocrinological examination revealed hypofunction of the adrenal gland. The results of various tests showed absence of distance metastasis except for that to the bilateral adrenal glands. Since complete remission was attained after 2 courses of COP-BLAM III therapy, and adrenal function also became normal, the patient was discharged on January 9, 1989. Malignant lymphoma originating from the adrenal gland seems to be a rare condition, and only 16 cases have been reported to this date.

Adrenal Gland Neoplasms↗
PubMed1990

[Cyclic neutropenia complicated of non-Hodgkin lymphoma].

This paper reports a case of non-Hodgkin's lymphoma concurrent with cyclic neutropenia. A 59-year-old man who exhibited a neutropenia at a periodicity of 14-20 days from July 1986 was diagnosed as having cyclic neutropenia, and was re-admitted to our hospital because of an abdominal tumor in April 1988. Gastroscopy revealed a Borrmann II-like elevated lesion, and abdominal CT scanning showed a low density area in the liver and swelling of the para-aortic lymph nodes. According to histological examination of the stomach and the liver, the patient was diagnosed as having non-Hodgkin's lymphoma (diffuse, medium-cell type). After completion of three courses of COP-BLAM III therapy, which was started on June 7, a partial response was achieved. However, the patient had a relapse and died on May 12, 1989. Cyclic neutropenia in this case was not considered to be due to an immunological abnormality mediated by lymphocytes, but may have been caused by an excessive response of the negative feedback mechanism due to an increase in CIA (Colony-inhibiting activity) of neutrophils. The fact that the patient's EB virus antibody titer became higher than at this initial hospitalization suggests the possible transition from chronic EB virus infection into malignant lymphoma.

Agranulocytosis↗
PubMed1990

Lipid composition of hepatitis B virus surface antigen particles and the particle-producing human hepatoma cell lines.

More than 90% of lipids of hepatitis B virus surface antigen (HBsAg) particles produced by two human hepatoma cell lines (huGK-14 and PLC/PRF/5) were composed of phospholipids, with phosphatidylcholine being the dominant component, accounting for more than 80% of total membrane lipids. Analysis of subclass compositions of phospholipids of HBsAg particles and the host cell lines revealed that 1,2-diacyl glycerophosphocholine was preferentially incorporated into the membrane of the HBsAg particles, although both host cell lines contained extremely high concentrations (more than 60% of total phospholipids) of ether-linked phospholipids. Phospholipids of other hepatoma cell lines (HuH-7, Hep-G2, and huL-1) which were not associated with hepatitis B virus (HBV) infection, were composed mostly of 1,2-diacylglycerophospholipids. Activities of dihydroxyacetone-phosphate acyltransferase, which is known to be an obligatory enzyme in ether lipid biosynthesis, were found to be elevated by three- to fourfold in both huGK-14 and PLC/PRF/5 cells compared to those of other hepatoma cell lines. The results suggest a possible relationship between HBV-induced hepatocellular carcinogenesis and the drastic change in the metabolism of membrane phospholipids.

Acyltransferases↗
PubMed1990

[Clinical study of estramustine phosphate disodium (Estracyt) on prostatic cancer--results of long-term therapy for 38 patients with prostatic cancer].

Estramustine phosphate disodium (Estracyt) was used in the treatment of 38 patients with prostatic carcinoma for at least 1 year. Of these patients 37 patients were treated with Estracyt as primary treatment and 1 patient had been treated with another antiandrogenic therapy before the Estracyt treatment. Estracyt was given orally in a dose of 560 mg/day in divided oral doses. The clinical evaluation was done for the change of PAP, the relapse rate, the survival rate and the side effect. Among 22 cases which had shown abnormally high PAP values before the treatment started, the values decreased or normalized in 21 cases (95.5%) in the first year of administration of Estracyt. In 6 cases, however, the values increased again in the second year or later. Relapse was observed in 10 (26.3%) out of 38 cases. Relapse rate was 2.6%, 51.7%, and 51.7%, at the first, third, and fifth year, respectively. Survival rate was 97.4% at the first year, 88.5% at the third year, and 68.8% at the fifth year for the follow-up study. Side effects were observed in 14 (36.8%) out of 38 cases. The main side effect was gynecomastia. Gastro-intestinal disturbance and edema were also observed. However, there were only 2 cases (5.2%) in which administration of Estracyt had to be discontinued.

Adenocarcinoma↗
PubMed1989

ESR study on synthetic glyceroglycolipid liposomal membranes.

We previously reported that glyceroglycolipid liposomes without cholesterol activated mouse peritoneal macrophages in vivo and in vitro, whereas glyceroglycolipid liposomes containing equimolar cholesterol did not. In order to characterize the properties of the glyceroglycolipid membranes, ESR spectroscopic studies were carried out with an acyl spin-labeled galactosyl ceramide (SL-GC) or a headgroup spin-labeled phospholipid (SL-6-DPPA) in 1,2-dipalmitoyl[beta-cellobiosyl-(1'---3)]glycerol (Cel-DAG) liposomal membranes. The ESR spectrum of the SL-GC in the Cel-DAG liposomes at 37 degrees C was a single broad line, indicating that the SL-GC molecules were excluded almost completely from Cel-DAG domains and formed clusters in the membranes. The spectrum of SL-6-DPPA in the Cel-DAG liposomes at 37 degrees C showed broad resonance lines with the central peak being the highest, while that at 60 degrees gave narrow lines with the low-field peak being the highest. This observation and rotational correlation time analysis showed that the molecular motions of spin-label moiety of the SL-6-DPPA were extremely restricted at 37 degrees C but not above Tc. These results suggest that below Tc the Cel-DAG molecules are packed tightly and restricted in motion in the membrane. Incorporation of cholesterol into the Cel-DAG liposomal membranes gave (1) the spectra of the SL-GC triplet, and (2) the spectra of the SL-6-DPPA narrow resonance with the low-field peak being the highest. These results suggest that cholesterol disturbs the rigid-packed structure of the Cel-DAG membrane and increases the molecular motions of the Cel-DAG. The DSC analysis of Cel-DAG with and without cholesterol agreed well to the results of the ESR technique. Thus we assume that peritoneal macrophages recognize the rigid-packed carbohydrate residues which are restricted in motion on the Cel-DAG membranes.

1,2-Dipalmitoylphosphatidylcholine↗
PubMed1989

Effective production of monoclonal antibodies against phosphatidylserine: stereo-specific recognition of phosphatidylserine by monoclonal antibody.

A system based on the direct immunization of phospholipid Ag into mouse spleen has been used to produce mAb against phosphatidylserine (PS). mAb that bind to PS but not to phosphatidylcholine were selected. Remarkable frequency of the production of mAb against PS was observed with the immunization protocol. The mAb exhibited three distinct reactivity profiles ranging from highly specific to broadly cross-reactive. Among 61 hybridomas, 15 mAb were established for further analysis. The reactivities of three typical mAb, designated PS4A7, PS3A, and PSC8, are described. PS4A7 is highly specific to PS and no cross-reaction with other acidic phospholipids was observed. In the experiments using PS derivatives with a modified polar head group, PS4A7 was shown to bind to 1,2-diacyl-sn-glycero-3-phospho-L-serine (PS) but not to 1,2-diacyl-sn-glycero-3-phospho-D-serine or 1,2-diacyl-sn-glycero-3-phospho-L-homoserine, indicating that the antibody recognizes the stereo-specific configuration of serine residue in PS. PS3A binds to both PS and phosphatidylethanolamine, whereas no cross-reaction with other acidic phospholipids was observed. The analysis using the derivatives of PS and phosphatidylethanolamine shows that the antibody recognizes the amino group of the phospholipid Ag and cannot distinguish the conformational structure of serine residue in PS. PSC8 represents the family of mAb that cross-react considerably with other acidic phospholipids.

Animals↗
PubMed1989

Mapping of insertion elements IS1, IS2 and IS3 on the Escherichia coli K-12 chromosome. Role of the insertion elements in formation of Hfrs and F' factors and in rearrangement of bacterial chromosomes.

The chromosome of an Escherichia coli K-12 strain W3110 contains seven copies of insertion element IS1, 12 copies of IS2 and six copies of IS3. We determined the approximate locations of six copies of IS1 (named is1A to is1F), ten copies of IS2 (named is2A to is2J), and five copies of IS3 (named is3A to is3E) on the W3110 chromosome by plaque hybridization using the "mini-set" of the lambda phage library that includes 476 clones carrying chromosomal segments that cover the W3110 chromosome almost entirely. Cleavage maps of the W3110 chromosome and cleavage analysis of phage DNAs carrying insertion elements allowed us to assign more precise locations to most of the insertion elements and to determine their orientations. Insertion elements were distributed randomly along the W3110 chromosome in one or other orientation. Several of these were located at the same positions on the chromosome of another E. coli K-12 strain, JE5519, and they were assumed to be the original complement of insertion elements in E. coli K-12 wild-type. Locations and orientations of such insertion elements were correlated well with Hfr points of origin and with crossover points for excision of some F' factors derived from several Hfrs. Insertion elements may be involved also in rearrangement of bacterial chromosomes.

Chromosomes, Bacterial↗
PubMed1989

Expression of a cross-reactive idiotope on naturally occurring murine antibodies against 3-fucosyllactosamine, levan, and dextran.

We recently identified a cross-reactive Id (6C4) that is expressed on the H chain of many BALB/c mAb against the 3-fucosyllactosamine (3-FL) determinant, Gal(beta 1-4) (Fuc(alpha 1-3] GlcNAc-R. The VH segments of seven mAb that we recently sequenced are encoded by VH441, which also encodes VH segments of antibodies against galactan, levan, and dextran. To analyze the expression of the 6C4 Id on naturally occurring anti-carbohydrate antibodies, we isolated 6C4+ antibodies by affinity chromatography from pools of normal BALB/c serum. Approximately 20 to 30% of antibodies against 3-FL and levan, and all antibodies against dextran, were removed from the sera by passage over a column containing mAb 6C4. Absorption of the eluate with 3-FL beads removed anti-3-FL antibodies but not anti-dextran or anti-levan. The expression of a cross-reactive Id on naturally occurring antibodies against several carbohydrate Ag suggests that these antibodies may participate in an Id network. We also reported previously that BALB/c mice have naturally occurring anti-3-FL antibodies and respond well to immunization against this determinant, whereas C57BL/6 mice do neither. To examine the role of the Igh-C allotype in the regulation of the anti-3-FL response, we studied congenic strains of BALB/c and C57BL/6 mice. Both congenic strains produced anti-3-FL antibodies in response to immunization, but only C.B-20 mice exhibited naturally occurring antibodies. These data suggest that the naturally occurring and elicited antibody responses against 3-FL are differentially regulated.

Animals↗
PubMed1989

Neurovisceral sphingomyelinosis in a Siamese cat.

This report presents the clinical, morphological and biochemical findings on an 11-month-old female Siamese cat with neurovisceral sphingomyelinosis. Gross pathological features and histochemical findings are compared with the human disease counterpart and the previously described animal models. Hepatomegaly was observed while splenomegaly was not. Although sphingomyelin in liver and spleen was biochemically elevated, histochemical results in this case were slightly different from those previously recorded in human and feline Niemann-Pick disease. These results suggest that this feline case might be a different type of animal Niemann-Pick disease to that reported previously.

Animals↗
PubMed1989

Establishment of a human glioma cell line bearing a homogeneously staining chromosomal region and releasing alpha- and beta-type transforming growth factors.

A human glioma cell line (YKG1), which was positively identified for glial fibrillary acidic (GFA) and S-100 proteins, was established from a surgical specimen of a patient with glioblastoma. Chromosome analysis of the cells revealed a homogeneously staining region (HSR) on a marker chromosome. The assay for transforming growth factors (TGFs) in the conditioned medium of the cell line revealed that it contained high levels of alpha- and beta-type TGFs, which might regulate the growth of glioblastoma and influence on the peritumoral tissues.

Cell Line↗
PubMed1989

Establishment and characterization of an immature epithelial cell line (ENU-T-1) derived from a rat nephroblastoma.

A new cell line designated ENU-T-1 has been established from a xenotransplanted experimental rat nephroblastoma. The cultured cells are spindle-shaped or polygonal and are arranged in a wavy fashion morphologically similar to cultured embryonal renal epithelial cells. The cells exhibit a number of epithelial characteristics. Enzyme histochemistry gives positive reactions for gamma-glutamyltranspeptidase and alkaline phosphatase, both of which are present in renal tubular epithelial cells. Immunofluorescence studies show positive reactions for vimentin and cytokeratin. When inoculated into athymic nude mice, the cultured cells form tumors composed of sheets of epithelial cells with focal tubular formation. This cell line may be of value in studying differentiation of nephroblastoma, and possibly normal nephrogenesis.

Animals↗
PubMed1989

Effect of shosaikoto, daisaikoto and sannoshashinto (traditional Japanese and Chinese medicines) on experimental hyperlipidemia in rats.

Effect of Sannoshashinto, Shosaikoto and Diasaikoto, Japanese and Chinese traditional medicinal mixtures (kampohozai), on cholesterol-induced hypercholesterolemia, aging-induced hyperlipidemia and cholesterol turnover were studied in rats. Sannoshashinto, Shosaikoto and Daisaikoto reduced the hypercholesterolemia induced by a high cholesterol diet and Sannoshashinto and Daisaikoto improved the atherogenetic index. Liver total cholesterol as increased by a high cholesterol diet was reduced by all three kampohozai. Furthermore, the increases of serum and liver triglyceride were also inhibited. In an experiment using untreated aging rats, both serum total cholesterol and serum triglyceride levels were increased. The aging-induced increases of serum total cholesterol were inhibited by Sannoshashinto and Daisaikoto and the increases of serum triglyceride were reduced by all three kampohozai. These drugs showed no effect on cholesterol biosynthesis in liver. Sannoshashinto, however, appeared to accelerate the disappearance of cholesterol from blood, while Daisaikoto inhibited the cholesterol absorption from the intestine.

Aging↗
PubMed1989

Promotional effect of lithocholic acid and 3-hydroxyanthranilic acid on transformation of X-ray-initiated BALB/3T3 cells.

X-ray-irradiated BALB/3T3 A31-1-1 cloned cells were post-treated with lithocholic acid (LCA), one of the bile acids, and 3-hydroxyanthranilic acid (3HOA), a tryptophan metabolite, in order to examine their potential to promote cell transformation. Insulin was added to the medium so as to increase the sensitivity of the cells to transformation. A dose-dependent increase in the number of transformed foci was observed with LCA. 3HOA had a very weak, though significant, activity. Transformation frequency was increased only a little, if any, by the treatment with cholic acid, which is structurally related to LCA. Anthranilic acid, an analogue of 3HOA, had no such effect. The results are discussed in view of the importance of endogenous promoters.

3-Hydroxyanthranilic Acid↗