Search PubMed⌕ Search

Biomedical subjects

N Tanabe

Publications and source records attributed to N Tanabe.

At least 109 records · Page 6Linked to original sources
PubMed1990

Two new potent inhibitors of xanthine oxidase from leaves of Perilla frutescens Britton var. acuta Kudo.

A known and a new caffeic ester (1 and 2), new inhibitors of xanthine oxidase (XO), were isolated from leaves of Perilla frutescens var. acuta and their structures have been established as (Z,E)-2-(3,4-dihydroxyphenyl)ethenyl ester (1) and (Z,E)-2-(3,5-dihydroxyphenyl)ethenyl ester (2) of 3-(3,4-dihydroxyphenyl)-2-propenoic acid, respectively, based on detailed spectral studies, including 2D COSY, long range COSY, difference NOE, etc. Both caffeic esters strongly inhibited XO in vitro and especially, the inhibition by 1 was as potent as that by allopurinol. The inhibition mode of 1 was also shown to be non-competitive.

Plants, Medicinal↗
PubMed1990

[Pure red cell aplasia with inhibitor to erythroid precursors in serum].

A patient with pure red cell aplasia (PRCA), who had the inhibitor to erythroid precursors in serum, is described. A 72-year-old female was referred to Nagoya National Hospital because of progressing anemia in April 1988. On admission, her hemoglobin was 4.8 g/dl, reticulocyte 0.8%, and bone marrow specimen contained only 1.2% erythroblast. On these bases, she was diagnosed as pure red cell aplasia. After small amount of blood was transfused, her hemoglobin and erythroblast in bone marrow (EBM) increased to 7.8 g/dl and 39.1%, respectively, and she was discharged. However, after a month, her hemoglobin dropped to 4.6 g/dl, reticulocyte to 0.1%, and EBM to 0%. Soon after corticosteroid therapy (prednisolone, 40 mg, daily) was started, a marked elevation of reticulocyte count was observed, and then her hemoglobin increased to 11.0 g/dl, and EBM to 31.6%. The reason for a transient spontaneous remission at the onset of her disease was occurred is unclear. The number of BFU-E in her bone marrow was within normal range, but it was suppressed significantly (65%) after the addition of her serum and the complement purified from rabbit plasma. This finding suggest the presence of inhibitor to erythroid precursors in her serum.

Aged↗
PubMed1990

[Abnormal cluster formation in a patient with myelodysplastic syndrome with trisomy-11--periodical approach by colony assay].

59 year old female was admitted to Nagoya Memorial Hospital for anemia unknown etiology after the work up of the gastrointestinal tract. Peripheral blood count at admission was as follows: WBC 2,400/microliters, RBC 321 X 10(4)/microliters, Hb 9.8 g/dl, Ht 30.1%, Plt 8.2 X 10(4)/microliters, which showed pancytopenia with normocytic, normochromic anemia. She had no hepatosplenomegaly, vitamin B12 nor folate deficiency. Bone marrow was hyperplastic and showed trilineage megalodysplastic changes. The diagnosis of myelodysplastic syndrome (Refractory anemia) was made. Progenitor assay showed no colony formation of BFU-E but showed normal growth of CFU-GM colony and cluster. She had chromosomal abnormality of 47, XX, + 11. Administrated anabolic steroid, prednine and activated vitamin D3 were not effective and she died of brain hemorrhage in April 1987. Colony assay at this stage showed numerous leukemic clusters and no normal colonies. Re-performed chromosome assay showed 47, XX, + 11. There are only a few reports of trisomy-11 in a patient with MDS. Especially we could follow this case till her leukemic transformation by colony assay.

Anemia, Refractory, with Excess of Blasts↗
PubMed1990

[Long-term surviving child with acute lymphoblastic leukemia complicated with legionellosis].

An 11 year-old girl was diagnosed as acute lymphoblastic leukemia (ALL) on November 26th 1979 and was induced into complete remission with vincristine and prednisolon. After consolidation therapy with daunomycin, vincristine and prednisolone, she developed pneumonia on January 21st 1980. No cause of pneumonia was found by sputum culture or serologic tests. Treatment with cefmetazol (CMZ), sulbenicillin (SBPC) and minocycline (MINO) was not effective but 9 g/day of LCM made a remarkable effect. Indirect immunofluorescence assay of antibody showed x 512 titers on January 22nd and in her recovery period, the titers showed eight times increased up to x 4,000. The diagnosis of Legionellosis was made on CDC's criteria. She recovered completely with sequential lincomycin (LCM) and erythromycin (EM) therapy. On October 1989, she is still in the first complete remission of ALL for more than 8 years.

Antineoplastic Combined Chemotherapy Protocols↗
PubMed1989

Ovarian Sertoli-Leydig cell tumor with elevated serum alpha-fetoprotein.

An 18-year-old girl with virilization and an elevated level of serum alpha-fetoprotein (AFP) was found to have a Sertoli-Leydig cell tumor (SLCT) of the ovary. The tumor had a heterologous element of gastrointestinal type epithelium, retiform pattern, and multilocular cysts, many of which were lined by Sertoli-like cells. Alpha-fetoprotein was detected immunohistochemically in cells with the histologic appearance of Sertoli cells, and testosterone was detected in the Leydig cells. Results of lectin affinity chromatography indicated that AFP produced by this tumor was different from the AFP to be found in the liver.

Adolescent↗
PubMed1989

Both augmentation and potentiation occur independently of internal Ca2+ at the frog neuromuscular junction.

Augmentation and potentiation of surface recorded endplate potentials (EPPs) were examined during and after tetanic nerve stimulation in both the normal and BAPTA (a Ca2+-chelator)-loaded frog neuromuscular junction (NMJ). In the BAPTA-loaded NMJ, in contrast to a great reduction of facilitation, the amplitudes and the time constants of augmentation and potentiation were almost the same as those in the normal NMJ. The slowly increasing process of transmitter release during tetanus was a little larger in the BAPTA-loaded NMJ than in the normal NMJ. These observations strongly suggest that both augmentation and potentiation occur independently of internal Ca2+ concentration.

Action Potentials↗
PubMed1989

Rapid assay of beta-galactosidase and sialyltransferase by lectin affinity high performance liquid chromatography with fluorescence detection.

Fluorescein isothiocyanate (FITC)-labelled asialotransferrin and pyridyl aminated oligosaccharides were prepared from asialotransferrin and human milk using affinity chromatography and high performance liquid chromatography (HPLC), respectively. These substances were incubated with galactosidase or sialyltransferase and then examined by lectin affinity HPLC. The elution patterns changed according to the period of incubation and amount of enzyme. This analytical method using lectin affinity HPLC with fluorescence labelled glycoprotein or oligosaccharides as the substrates has great value for detecting these enzyme under the same chromatographic conditions. In addition, differences were noted in the activity of beta-galactosidase toward oligosaccharides having the Gal beta(1----3)GlcNAc or Gal beta(1----4)GlcNAc structure at reducing termini.

Chromatography, Affinity↗
PubMed1989

[Tc-99m DTPA scintigraphic findings in patients with postoperative complications of renal transplantation].

Tc-99m DTPA scintigraphic findings in patients with postoperative complications of renal transplantation were presented. In acute tubular necrosis, excretion of the tracer was not observed though its perfusion was preserved. In acute rejection, perfusion was reversibly disturbed. In chronic rejection, perfusion was irreversibly disturbed. In renal infarction, multiple defects were observed. In renal vein thrombosis, similar pattern to acute tubular necrosis was found but RI venography was helpful. In lymphocele, perirenal photon deficiency was observed. In renal artery thrombosis, absence of the perfusion and total photon deficient were noted. Tc-99m DTPA renal scintigraphy is useful for diagnosis and follow up of the complications of transplanted kidneys.

Adolescent↗
PubMed1988

Transmitter release at frog end-plate loaded with a Ca2+-chelator, BAPTA: hypertonicity and erythrosin B augment the release independently of internal Ca2+.

A Ca2+-chelator, bis-(aminophenoxy)ethane-tetraacetic acid (BAPTA) was loaded into the presynaptic nerve terminal of frog end-plate. The BAPTA-loaded preparation showed little facilitation. However, the facilitation reappeared upon addition of an ionophore, X-537A, supporting the view that the loss of facilitation was due to the Ca2+-buffering action of BAPTA. Both hypertonic conditions and erythrosin B increased both the size of end-plate potentials and frequency of miniature end-plate potentials without any recovery of facilitation at the BAPTA-loaded end-plate. This suggested that transmitter release was increased by both conditions with little change in internal Ca2+ concentration.

Action Potentials↗
PubMed1988

Calcium-independent increase of transmitter release at frog end-plate by trinitrobenzene sulphonic acid.

1. Application of an amino-residue-modifying reagent, 2,4,6-trinitrobenzene-1-sulphonic acid (TNBS), to the frog neuromuscular junction in high-magnesium Ringer solution rapidly increased both the amplitude of nerve-evoked end-plate potentials (EPPs) and the frequency of miniature end-plate potentials (MEPPs). These showed a similar initial time course and reached a maximum 3-7 min and about 10 min, respectively, after the start of application of 2 mM-TNBS. Then, the EPP amplitude decreased, while the MEPP frequency maintained its plateau value. The increase in transmitter release and the decrease in EPP amplitude by TNBS may have been due to different modes of action. 2. The distribution of MEPP amplitude was unchanged by TNBS treatment. 3. The carbachol-induced postsynaptic potential and the extracellularly recorded presynaptic action current were not affected by TNBS treatment for up to 30 min, indicating that the change in EPP amplitude produced by TNBS was not due to either a postsynaptic effect or a change in action potential at the presynaptic terminal. 4. The frequency of MEPPs was increased by TNBS application even when Ca2+ was omitted from the external Ringer solution or when a specific calcium channel blocker, synthetic omega-conotoxin, was added. This indicates that Ca2+ inflow to the nerve terminal is not necessary for TNBS action. 5. When a calcium chelator, BAPTA, was loaded into the presynaptic nerve terminal, the facilitation of EPPs by trains of nerve stimuli was scarcely observed. This suggested that the cytosolic free Ca2+ in the presynaptic terminal was buffered by BAPTA. Under this condition, the amplitudes of EPPs were increased by TNBS application to the same extent as in the control without BAPTA, but were accompanied by little facilitation. The MEPP frequency was also increased by TNBS to the same extent as in the control. These results suggest strongly that augmentation of transmitter release by TNBS was not due to an increase in cytosolic Ca2+ concentration. 6. These observations suggest that TNBS might react with specific protein(s) on the outer surface of the presynaptic membrane and accelerate the exocytosis of synaptic vesicles.

Action Potentials↗
PubMed1987

Ex vivo comparison of radiological and histological evaluation of early metastatic lesions of pelvic lymph nodes from carcinoma of the bladder or prostate.

To study the limitations of lymphangiography in the detection of early lymphatic spread of pelvic malignancies, we evaluated 587 lymph nodes from 23 patients with stages pN0 to 2 carcinoma of the bladder or prostate. Pelvic lymphadenectomy was performed 5 to 10 days after bipedal lymphangiography. Excised lymph nodes were separated one by one and an x-ray of each node was taken (lymphnodegram). The individual lymphnodegram was compared to the histological findings. Interpretations of lymphnodegrams from all 17 nodes with metastases were positive in 5, suspicious in 1, negative in 9 and radiolucent in 2. False negative judgments occurred chiefly because metastatic foci were microscopic. Two lymph nodes without metastasis were interpreted as positive for disease because of fat replacement of the nodes. These results indicated that lymphangiography is not suitable for the detection of early lymphatic metastases of carcinoma of the bladder or prostate.

Humans↗
PubMed1987

Right adrenal pheochromocytoma with anterolateral displacement of the inferior vena cava: skin incision and approach.

We report a case of a right adrenal pheochromocytoma with prominent anterolateral displacement of the inferior vena cava. A right ipsilateral anterior subcostal incision extending from the xiphoid process to the 11th intercostal space allowed for wide upward retraction of the right costal arch. This incision is useful for easy mobilization of the liver and manipulation of the inferior vena cava without thoracotomy.

Adrenal Gland Neoplasms↗
PubMed1987

Biosynthesis and secretion of functional protein S by a human megakaryoblastic cell line (MEG-01).

A human megakaryoblastic cell line (MEG-01) was investigated for the presence of protein S in culture medium and cell lysates using a specific enzyme-linked immunoassay (ELISA) and a functional assay. When 5 X 10(5) MEG-01 cells/mL was subcultured in RPMI 1640 medium with 10% fetal calf serum (FCS), the concentration of protein S antigen in the culture medium increased progressively with time from less than 8 ng/mL on day 0 to 105.6 +/- 6.0 ng/mL on day 13. Vitamin K2(1 microgram/mL) increased the production of functional protein S, whereas warfarin (1 microgram/mL) profoundly decreased the quantity and the specific activity of secreted protein S. By an indirect immunofluorescent technique, protein S antigen was detected in both MEG-01 cells and human bone marrow megakaryocytes. Immunoblot analysis of culture medium revealed two distinct bands (mol wt 84,000 and 78,000) that are identical to the doublets of purified plasma protein S. De novo synthesis of protein S was demonstrated by the presence of specific immunoprecipitable radioactivity in the medium after 5 hours of labeling of the cells with [35S]-methionine as a 84,000 mol wt protein. Plasma protein S levels of nine patients with severe aplastic anemia were not significantly different from those of normal controls. These results suggest that megakaryocytes produce functional protein S and contain the enzymes required for the carboxylation of selected glutamic acid residues, and that protein S synthesized by megakaryocytes does not represent a main source of plasma protein S.

Anemia, Aplastic↗