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Biomedical subjects

H Minami

Publications and source records attributed to H Minami.

At least 19 recordsLinked to original sources
PubMed1992

Role of liver-type glucose transporter (GLUT2) in transport across the basolateral membrane in rat jejunum.

To obtain information on the regulation of glucose transport across the basolateral membrane (BLM) of intestinal epithelial cells, we measured the number of [3H]cytochalasin B binding sites and the level of liver-type glucose transporter (GLUT2) protein in the BLM in the jejunum of rats (i) with diabetes (ii) given a high-carbohydrate diet or (iii) with experimental hyperglycemia (12 h infusion of a high-glucose solution). A glucose uptake and the number of D-glucose inhibitable [3H]cytochalasin B binding sites in BLM vesicles were significantly increased in all three conditions. Western blot analysis showed that the amount of GLUT2 protein in BLM vesicles was increased in rats with diabetes and those given a high-carbohydrate diet, but not in those with experimental hyperglycemia. These results suggest that there is a mechanism for rapid regulation of glucose transport in the BLM that does not depend on change in the amount of GLUT2.

Animals↗
PubMed1992

Specific binding of CAP-50 to calcyclin.

CAP-50, a calcyclin-associated protein with an apparent molecular mass of 50 kDa, was purified and proved to be a novel annexin [Tokumitsu, H. et al. (1992) J. Biol. Chem. 267, 8919-8924]. We examined the binding of CAP-50 to other Ca(2+)-binding proteins which have two of four EF-hand structures, by a co-precipitation assay with phospholipid (phosphatidylserine). Among nine Ca(2+)-binding proteins (calcyclin, S-100 proteins, p11, calgizzarin, calvasculin, calmodulin and troponin C) examined, only calcyclin interacted with CAP-50. These results clearly show that the interaction of CAP-50 to calcyclin is specific, i.e. other Ca(2+)-binding proteins with the EF-hand structure could not substitute for calcyclin, thereby suggesting the possible role in specific regulation of the function of CAP-50 by Ca2+/calcyclin.

Animals↗
PubMed1992

CAP-50, a newly identified annexin, localizes in nuclei of cultured fibroblast 3Y1 cells.

A 50-kDa protein, which binds to the growth-regulated gene (2A9) product, calcyclin in a calcium-dependent manner, was purified from bovine lung. Partial amino acid sequencing of the protein revealed it to be the bovine equivalent of rabbit lung CAP-50 (calcyclin-associated protein, 50 kDa), which is a member of the annexin family and binds to calcyclin in a calcium-dependent manner. Specific polyclonal antibodies to bovine lung CAP-50 were prepared. Comparative studies between CAP-50 and synexin (annexin VII) on the immunoreactivity against anti-CAP-50 antibodies and the ability of binding to calcyclin revealed that CAP-50 was a distinct molecule from synexin. Using specific polyclonal antibodies to bovine lung CAP-50, tissue distribution and subcellular distribution of CAP-50 were investigated. In most rat tissues, except those in the central nervous systems and kidney, CAP-50 is expressed at a high or moderate level. Both studies by subcellular fractionation and by indirect immunofluorescence staining of the rat embryonic fibroblast cell line, 3Y1, revealed that CAP-50 mainly localized in nuclei. Moreover, between the cells at interphase and at mitotic phase, different distributions of CAP-50 were observed. That is, in the cells at interphase, CAP-50 seemed to localize throughout the nucleoplasm. On the other hand, in the cells during mitosis, CAP-50 was concentrated at the loop-like structure around the mitotic apparatus. CAP-50 was found in isolated 3Y1 nuclei lacking outer nuclear membranes, and approximately 50% of CAP-50 was extracted from the nuclei by chelating calcium. Thus, CAP-50, a unique annexin, localizes in nuclei.

Amino Acid Sequence↗
PubMed1992

A calcyclin-associated protein is a newly identified member of the Ca2+/phospholipid-binding proteins, annexin family.

A calcyclin-associated protein with an apparent molecular weight of 50,000 (CAP-50) was purified from rabbit lung. The procedure included ammonium sulfate precipitation, anion and cation ion-exchange, and calcyclin affinity chromatographies. Interestingly, partial amino acid sequences of lysyl-endpeptidase-digested fragments indicated that CAP-50 was a member of the Ca2+/phospholipid-binding proteins, the annexin family. The sequence of a proteolytic peptide with Staphylococcus aureus V8 protease on NH2-terminal region is not homologous with any other annexin family proteins. Phospholipid binding studies showed that CAP-50 bound to phosphatidylserine, phosphatidylethanolamine, phosphatidylinositol, and phosphatidic acid-containing vesicles, in a Ca(2+)-dependent manner. In the presence of Ca2+/calcyclin, CAP-50 formed a complex with calcyclin and bound to the PS-containing vesicles. The apparent Kd value of calcyclin for CAP-50 was calculated to be 1.61 x 10(-6) M. Zero-length cross-linking studies indicated that 1 mol of CAP-50 bound to an equimolar unit of calcyclin. CAP-50 inhibited the phospholipase A2 activity, dose-dependently (IC50 = 0.2 microM), however, calcyclin did not alter the inhibitory effect. With the 125I-calcyclin gel overlay method, calcyclin bound tightly to CAP-50 in a Ca(2+)-dependent manner after sodium dodecyl sulfate-polyacrylamide gel electrophoresis. These results suggest that rabbit lung CAP-50 is a newly identified member of the annexin family. Ca2+/calcyclin apparently regulates the function of CAP-50 on cytosolic face of the plasma membrane.

Amino Acid Sequence↗
PubMed1992

Developmental changes in intestinal glucose transporter mRNA levels.

Developmental changes in glucose transporter mRNA levels in the jejunum of rats of different ages were examined by using slot blot RNA analysis. The level of SGLT1 mRNA did not change significantly through life. The GLUT5 mRNA level was highest in 10-day-old rats and then decreased reaching the adult level by day 20 after birth. The GLUT2 mRNA level was low in rats of 5 and 10 days old, but then increased progressively reaching the adult value by day 25 after birth. These results indicate that the expressions of intestinal facilitative glucose transporter genes change markedly in the third week after birth.

Aging↗
PubMed1992

Differential mechanisms of induction of ornithine decarboxylase in rat intestine by L- and D-amino acids.

A single intragastric administration of glycine, L- and D-alanine, and L-and D-serine into rats resulted in a more than 20-fold stimulation of intestinal mucosal ornithine decarboxylase (ODC) within 4 h. The stimulation of ODC activity was accompanied by an increase in the amount of immunoreactive ODC protein. The induction of ODC by D-amino acids was in all likelihood attributable to an enhanced accumulation of ODC-specific mRNA species as revealed by Northern blot and dot-blot hybridization analyses. However, the induction by glycine and L-amino acids was not explainable by changes of mRNA since the changes in mRNA contents were only marginal. Since the turnover rates of L-serine-induced and D-serine-induced intestinal ODC protein were the same as the non-induced control, we concluded that the induction by glycine and L-amino acids was brought about by an increased efficiency of translation of the ODC message.

Amino Acids↗
PubMed1992

Characteristics and mechanism of glutamine-dipeptide absorption in human intestine.

Using in vivo and in vitro techniques, the mechanism by which intestinal mucosa obtains glutamine from luminal oligopeptides was investigated in humans. The rate of hydrolysis by mucosal brush border membrane was more than threefold greater for alanylglutamine than for glycylglutamine. Despite this difference, rates of dipeptide and amino acid disappearance during intestinal perfusion were greater from test solutions containing glycylglutamine than alanylglutamine. Furthermore, rates of intraluminal appearance of products of hydrolysis during the infusion of two dipeptides were similar and less than 5% of the disappearance rate of the parent dipeptide. In contrast to free glutamine, uptake of peptide-bound glutamine by brush border membrane vesicles was not inhibited by deletion of sodium or addition of free amino acids to the incubation medium but was inhibited by other oligopeptides and stimulated by a proton gradient. Inhibition constants for the saturable uptake of glycylglutamine and alanylglutamine by vesicles were not significantly different, suggesting similar affinities for the peptide transporter. It is concluded that in human intestine the predominant mechanism for assimilation of glutamine-dipeptides is absorption as intact dipeptide rather than hydrolysis.

Absorption↗
PubMed1992

Small caliber catheter drainage for spontaneous pneumothorax.

Excellent results have been reported after small caliber catheters were used for iatrogenic pneumothoraces. However, the value of using such catheters for spontaneous pneumothoraces is not clear. The purpose of this study, therefore, is to examine the efficacy of small caliber catheters in managing spontaneous pneumothoraces. Seventy six episodes of spontaneous pneumothorax were treated using a small caliber catheter (No. 5.5 or 7.0 French) connected to a Heimlich valve. All catheters were inserted by physicians. The treatment was considered successful when there was no air leakage and little or no residual pneumothorax. Before the lungs were fully expanded, four patients had died and one had refused to comply with further treatment. The remaining 71 episodes of pneumothoraces were evaluated for efficacy. The treatment was successful in 60 patients (84.5%) and ineffective in the remaining 11. The conventional large caliber tube was inserted in 10 of the 11 failures, but they were successful in only six. No major complications resulting from catheter insertion occurred, and no catheters became occluded. The catheter was easy to insert, and the scar that remained after removal of the catheter was very small. Not only are small caliber catheters effective for managing spontaneous pneumothoraces, they are the initial treatment of choice.

Catheterization↗
PubMed1992

Oligopeptides: mechanism of renal clearance depends on molecular structure.

We have investigated the relative contribution of hydrolysis, intact transport and urinary excretion to the renal clearance of Gly-Sar, Gly-Sar-Sar, and Gly-Gly-Sar in fed and starved rats. The results obtained from isolated kidney perfusion studies are summarized as follows: 1) clearance was fastest for Gly-Gly-Sar and slowest for Gly-Sar-Sar, 2) urinary excretion of Gly-Sar-Sar exceeded that of Gly-Gly-Sar or Gly-Sar, 3) there was accumulation of products of hydrolysis of Gly-Gly-Sar in the perfusate but not of Gly-Sar or Gly-Sar-Sar, 4) isolated brush-border and basolateral membranes of renal tubular cells lacked hydrolytic activity against Gly-Sar and Gly-Sar-Sar but possessed hydrolytic activity against Gly-Gly-Sar, 5) an excess amount of Gly-Sar-Sar reduced the rate of clearance of Gly-Gly-Sar by approximately 40% and significantly increased urinary excretion of this peptide, 6) the nonfiltering kidney cleared Gly-Gly-Sar at a rate which was 50% of that of the filtering kidney but did not clear Gly-Sar, and 7) starvation for 96 h was without a significant effect on the renal clearance of either Gly-Sar or Gly-Sar-Sar but significantly reduced the renal clearance of Gly-Gly-Sar and the brush-border membrane hydrolase activity against this peptide. We conclude that the molecular structure determines the affinity of oligopeptides for the membrane transport and hydrolytic systems, which, in turn, determines their efficiency for clearance by the kidney.

Animals↗
PubMed1992

[Subcapsular orchiectomy using the ultrasonic surgical aspirator in patients with advanced prostatic cancer].

We report a technique for performing subcapsular orchiectomy using the ultrasonic surgical aspirator (USA). The procedure was simple and safe, and was completed within one hour in 2 patients on whom it was carried out. Operative complications such as bleeding, postoperative pain and wound swelling were minimal, and compression dressings were not necessary. Postoperatively, the serum testosterone value was lowered to the castrate level. We conclude that subcapsular orchiectomy using USA is superior to conventional bilateral scrotal orchiectomy, and will be a useful option.

Humans↗
PubMed1992

[A case of interstitial pneumonitis with hemoptysis, BOOP (bronchiolitis obliterans organizing pneumonia) pattern, granulomas and foreign body giant cells in lung biopsy].

A 66-year-old male presented to our hospital in January 1990 with chief complaints of hemoptysis and cough. These symptoms had developed 10 months previously and had gradually increased. Fine crepitations were audible over the right lower lung field. There were no results suggesting an inflammatory process such as leucocytosis, elevation of ESR or positive CRP reaction. Chest X-ray film on the first visit showed fine nodular shadows in the right lower lung field, and chest CT revealed fine nodular shadows and mild dilatation of the right lower lobe bronchus. Transbronchial lung biopsy specimens showed granulomas with multinucleated giant cells, alveolitis and Masson bodies. The open lung biopsy specimens showed numerous macrophages and foreign body giant cells, and extensive organizing exudates in the bronchioles and alveolar spaces. Proliferation of smooth muscle and fibrosis around the dilated bronchioles were also seen. Thus, this patient demonstrated BOOP pattern, with granulomas and foreign body giant cells. His hemoptysis appeared to have resulted from inflammation of dilated bronchioles. His symptoms and abnormal shadows on chest X-ray improved without any therapy after admission. After treatment with corticosteroid, the diffuse fine nodular shadows disappeared. There has been no recurrence of symptoms to date, although this patient has continued living in the same environment as prior to admission. BAL findings during his prolonged follow-up revealed decrease in lymphocytes and elevation of CD4/CD8 ratio. Although the presence of granulomas suggests the possibility of an allergic reaction, no antigenic material could be identified in this case.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMed1992

Nurses and doctors ... and patients.

A Forum discussion group hosted by Dr Eilif Liisberg was formed from a few of the participants at a WHO nursing conference in Geneva. Subjects discussed were the status of nursing and changing attitudes to patients.

Attitude of Health Personnel↗
PubMed1991

Diabetes and glucose transporter gene expression in rat small intestine.

The expressions of Na(+)-dependent glucose transporter (SGLT1) and five facilitative glucose transporter genes (GLUT1-5) in the small intestine of streptozotocin (STZ)-induced diabetic rats were examined by RNA blotting analysis. The transcripts of SGLT1 mRNA gave bands of 4.5 Kilobases (Kb) and 2.8Kb (very faint band). The levels of SGLT1 mRNA were significantly increased in 30- and 60-day STZ rats, but not changed in acute diabetic rats (2- to 10- day STZ rats). The GLUT2 mRNA levels changed in parallel with the D-galactose transport activity, being increased about 4-fold in 5-day STZ rats. The transcripts of GLUT5 mRNA gave three bands of 5.1Kb, 2.8Kb and 2.OKb, whose levels were significantly reduced in 30- and 60-day STZ rats. These results suggest that the facilitative glucose transporter (GLUT2), in addition to the Na(+)-dependent glucose transporter (SGLT1), may play an important role in intestinal glucose transport in diabetic rats.

Animals↗
PubMed1991

Molecular cloning and sequencing of a cDNA clone encoding a new calcium binding protein, named calgizzarin, from rabbit lung.

We purified a new EF-hand type calcium binding protein from chicken gizzard smooth muscle, tentatively named calgizzarin (Todoroki, H., et al. J. Biol. Chem. (1991) in press. Based on the internal peptide sequence of calgizzarin, we isolated and sequenced a cDNA clone coding for calgizzarin from a rabbit lung cDNA library. This clone (pCALG) has 309 nucleotides of open reading frame including termination codon TGA, 621 nucleotides of the 5' leader and 186 nucleotides of the 3' noncoding region. The polypeptides deduced from the open reading frame were consisted of 102 amino acid residues with a molecular weight of 11,429. Computer aided homology analysis revealed that calgizzarin exhibits a 43.2% homology to S-100 alpha, 38.6% to S-100 beta and 40.0% to annexin II light chain, p10. By Northern blot analysis, with pCALG, a band of 1.1 kbp was detected in rabbit lung, suggesting pCALG contains nearly full length of mRNA.

Amino Acid Sequence↗
PubMed1991

Ion channel sensors for glutamic acid.

Coulometric biosensors using glutamate receptor (GluR) ion channel protein as a signal-amplifying sensory element that exploit the glutamate-triggered Na+ ion current through bilayer lipid membranes have been fabricated. The formation of stable planar bilayer lipid membranes was achieved by applying the folding method across a small circular aperture bored through a thin polyimide film. The multichannel type sensing membranes, formed across an aperture of ca. 120 microns diameter, contained more than 10 GluR proteins and showed L-glutamate-triggered response as a composite of individual single-channel currents. The single-channel type sensing membranes, formed across an aperture of ca. 20 microns diameter, contained a sufficiently small number of GluR proteins so that the response was observed as a series of single-channel pulse currents. Dependence of the integrated channel current on the glutamate concentration was examined. A sharp concentration dependence of up to ca. 1.5 x 10(-7) M and 3 x 10(-6) M for the multichannel and single-channel type sensors, respectively, was observed. A high selectivity for L-glutamate compared with D-glutamate for inducing the channel current was observed. A detection limit as low as ca. 3 x 10(-8) M was attained for the multichannel type sensor. This remarkable sensitivity is discussed in terms of the potential use of GluR ion channel protein for a new type of sensing system.

Biosensing Techniques↗
PubMed1991

Purification, characterization, and partial sequence analysis of a newly identified EF-hand type 13-kDa Ca(2+)-binding protein from smooth muscle and non-muscle tissues.

A novel Ca(2+)-binding protein, tentatively designated calgizzarin, has been purified to apparent homogeneity from chicken gizzard smooth muscle by W-7 (N-(6-aminohexyl-5-chloro-1-naphthalenesulfonamide))-Sepharose affinity chromatography and ion-exchange chromatography. Application of W-7-Sepharose affinity chromatography to various tissues revealed that calgizzarin-like proteins were abundant in bovine aorta and rabbit lung. Using the same procedure, we could purify a calgizzarin-like protein from rabbit lung. Calgizzarin has a Mr of 13,000 as determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and approximately 30,000 as determined by gel filtration on a TSK G 3000SW high performance liquid chromatography column, suggesting that calgizzarin seems to be a rodlike protein. The isoelectric point of calgizzarin was found to be pH 5.8. Calgizzarin can exist as a dimer by forming a disulfide bridge. The 45Ca autoradiographic technique showed that the protein binds to Ca2+. On an alkaline/urea gel, calgizzarin migrated faster in the presence of EGTA than in the presence of CaCl2, thereby indicating a Ca(2+)-dependent conformational change in this protein. The partial amino acid sequence (65 amino acid residues) of calgizzarin was seen to be SLLAVFQRYAGREGDNLKLSKKEFRTFMNTELASFTKNQKDPAVVDRMMKRLDINSDGQLDFQEF, and two putative Ca(2+)-binding sites (GREGDNLKLSKKE and D INSDGQLDFQE) were detected. So far as the obtained 65-amino acid sequence is concerned, calgizzarin has approximately a 50% sequence homology with S-100 alpha, 47% with S-100 beta, and 39% with pEL-98 protein.

Amino Acid Sequence↗