Plasma atrial natriuretic peptide (ANP) in dogs with mild heartworm infection.     

N Takemura  H Koyama  T Sako  K Ando  S Motoyoshi  F Marumo 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》1991,53(2):323-325

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Changes in Activities of Enzymes Related to Energy Metabolism in Peripheral Leukocytes of Fattening Steers     

Kimura N  Yoshimura I  Sako T  Inoue A  Tadami K  Arai T 《Veterinary research communications》2005,29(1):19-26

Glucose, triglyceride, cholesterol and immunoreactive insulin (IRI) concentrations, some enzyme activities in plasma, and activities of enzymes related to energy metabolism in peripheral leukocytes were measured in fattening Japanese Black Wagyu x Holstein steers fed on different diets at 8, 12, 16, 20 and 24 months of age. The plasma IRI concentrations at 20 and 24 months of age were significantly higher than those at 8 months of age. Activities of hexokinase (HK), glucose-6-phosphate dehydrogenase (G6PD), aspartate aminotransferase (AST), and malate dehydrogenase (MDH) in cytosolic fractions, and glutamate dehydrogenase (GLDH), MDH and AST in mitochondrial fractions in peripheral leukocytes of steers at 24 months of age were significantly higher than those at 8 months. Increasing plasma insulin concentration was considered to induce acceleration of glucose utilization in leukocytes of fattening steers. The cytosolic ratio of MDH/lactate dehydrogenase (LDH) activity in leukocytes increased significantly in the fattening process and was considered to be a useful indicator for evaluating changes in energy metabolism in steers.  相似文献   

A Comparison of the Plasma Fructose Concentrations in Dogs and Cats and Changes in the Fructose Concentrations in Dogs Following Intravenous Administration of Fructose     

Arai  T.  Hashimoto  K.  Muzutani  H.  Kawabata  T.  Sako  T.  Washizu  T. 《Veterinary research communications》1999,23(4):203-209

The plasma concentrations of fructose, glucose, free fatty acids (FFA) and triglycerides (TG) were measured in dogs and cats. Changes in these concentrations were investigated in dogs by an intravenous fructose tolerance test (IVFTT) at a dose of 0.1 g/kg body weight. Fructose concentrations in the plasma of dogs were significantly higher than those of cats. There was no significant difference in plasma glucose concentrations between dogs and cats. Plasma FFA concentrations decreased and TG concentrations increased after feeding in both dogs and cats. During the IVFTT, the plasma fructose concentrations in the dogs increased rapidly to a peak by 2 min and then decreased to half of the peak by 5 min after the administration of fructose. Administration of fructose resulted in an increase in the plasma TG concentrations and reduced plasma FFA concentrations in the dogs. Only 4% of the administered fructose was detected in the urine of dogs following IVFTT. Plasma fructose was considered to be rapidly absorbed and metabolized in both dogs and cats. However, as with glucose metabolism, there appear to be some differences in fructose metabolism between dogs and cats.  相似文献   

Comparison of the activities of enzymes related to glycolysis and gluconeogenesis in the liver of dogs and cats.     

T Washizu  A Tanaka  T Sako  M Washizu  T Arai 《Research in veterinary science》1999,67(2):205-206

Activities of enzymes related to glucose metabolism were measured in canine and feline liver. There were no significant differences in plasma glucose and immunoreactive insulin concentrations between dogs and cats. Glucokinase activities were absent in feline liver, however, activities of other glycolytic enzymes such as hexokinase, phosphofructokinase and pyruvate kinase, were significantly higher than those in canine livers. Activities of rate limiting enzymes of gluconeogenesis such as pyruvate carboxylase, fructose-1, 6-bisphosphatase and glucose-6-phosphatase in feline livers were significantly higher than those in canine livers.  相似文献   

The functional effect of Gly209 and Ile213 substitutions on lysozyme activity of family 19 chitinase encoded by cyanophage Ma-LMM01     

Hosoda  Naohiko  Kurokawa  Yoichi  Sako  Yoshihiko  Nagasaki  Keizo  Yoshida  Takashi  Hiroishi  Shingo 《Fisheries Science》2011,77(4):665-670

ORF69 in the cyanophage infecting Microcystis aeruginosa, Ma-LMM01, shows homology to the family 19 chitinases where the catalytic domain has structural similarity to lysozyme. Chitinases hydrolyze chitin, a β-1, 4-linked monopolymer of N-acetylglucosamine (GlcNAc); whereas lysozymes hydrolyzes peptidoglycan, alternating β-1, 4-linked copolymers of N-acetylmuramic acid (MurNAc) and GlcNAc. Using amino acid sequence comparison to ORF69, the putative sugar binding residues, Gln162 and Lys165, from the barley chitinase (the model enzyme for the family 19 chitinases) corresponding to subsites −4 and −3 were found to be replaced with Gly209 and Ile213, respectively, in ORF69. To analyze their contribution to substrate binding affinity, ORF69 was cloned into Escherichia coli; and two mutant proteins G209Q and I213K were prepared using site-directed mutagenesis. The wild-type gene product (gp69) showed both lysozyme and chitinase activities. In contrast, the I213K mutant showed a decrease (70%) in lysozyme activity and a significant increase (50%) in chitinase activity; whereas, the G209Q mutant almost completely abolished both enzyme activities. The data suggest the Ile213 residue is involved in recognizing the substrate MurNAc; and Gly209 has significant contribution in chitinase and lysozyme activities for the wild-type gp69.  相似文献   

Effect of glimepiride and nateglinide on serum insulin and glucose concentration in healthy cats     

A. Mori  P. Lee  T. Yamashita  Y. Nishimaki  H. Oda  K. Saeki  Y. Miki  H. Mizutani  K. Ishioka  T. Honjo  T. Arai  T. Sako 《Veterinary research communications》2009,33(8):957-970

Glimepiride and nateglinide are two common oral hypoglycemic agents currently being used with humans suffering from Type 2 diabetes mellitus. Neither drug has been tested with cats thus far and it is currently unknown whether either of these drugs exert any effect in cats or not. The objective of this study was to determine the effect of glimepiride and nateglinide on glucose and insulin responses in healthy control cats, in order to determine their potential use in diabetic cats. The intravenous glucose tolerance tests was carried out since it is an excellent test for evaluating pancreatic β-cell function for insulin secretion. Alterations in the insulin secretion pattern can be perceived as the earliest sign of β-cell dysfunction in many species, including cats. Nateglinide demonstrated a quick action/short duration type effect with serum glucose nadiring and insulin response peaking at 60 and 20 minutes, respectively. Alternatively, glimepiride is medium-to-long acting with serum glucose nadiring and insulin response peaking at 180 minutes and 60 minutes, respectively. Nateglinide’s potency was evident allowing it to induce a 1.5–2 higher preliminary insulin peak (3.7?±?1.1 pg/ml) than glimepiride’s (2.5?±?0.1 pg/ml), albeit only for a short period of time. Because glimepiride and nateglinide have a shared mode of action, no significant differences in overall glucose AUC_0-360min (24,435?±?2,940 versus 24,782?±?2,354 mg min/dl) and insulin AUC_0-360min (410?±?192 versus 460?±?159) in healthy control cats were observed. These findings may provide useful information when choosing a hypoglycemic drug suited for the treatment of diabetic cats depending on the degree of diabetes mellitus the cat is suffering from.  相似文献   

Gene expression of Microcystis aeruginosa during infection of cyanomyovirus Ma-LMM01     

Takashi Honda  Haruna Takahashi  Yoshihiko Sako  Takashi Yoshida 《Fisheries Science》2014,80(1):83-91

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Neutrophil adherence,phagocytic-nitroblue tetrazolium reduction and chemiluminescence in canine whole blood     

H. Nagahata  T. Sako  J. A. Reiter  S. P. Dibartola  C. G. Couto  G. J. Kociba 《Veterinary research communications》1991,15(3):181-188

Methods for measuring neutrophil adherence, phagocytic-nitroblue tetrazolium (NBT) reducing activity and chemiluminescence were applied to canine whole blood as means for routine assessment of neutrophil functions. The phagocytic-NBT reduction test appeared to be useful for monitoring the NBT reducing activity of phagocytic cells associated with phagocytic functions. Ethylene diamine tetraacetic acid suppressed both the adherence and the phagocytic-NBT reducing activity of neutrophils. Increased phagocytic-NBT reduction and an enhanced chemiluminescence response were observed in dogs with neutrophilia. These methods provide a rapid and practical screening procedure for measuring selected phagocytic functions in canine whole blood.  相似文献   

Pharmacokinetics of human alpha-atrial natriuretic peptide (alpha-hANP) in cow and dog     

N Takemura  H Koyama  T Sako  K Ando  K Suzuki  S Motoyoshi  F Marumo 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1990,52(1):165-166

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Effect of dihydroheptaprenol on nitroblue tetrazolium reduction by swine alveolar macrophages     

T Watari  R Goitsuka  H Koyama  T Sako  T Uchino  S Araki  A Hasegawa  S Motoyoshi 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1989,51(3):630-631

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