Pharmacology

狩野 泰輝

カノウ タイキ  (kano taiki)

基本情報

所属
藤田医科大学 医学部 医学科 薬理学 助教
学位
博士(医学)(藤田医科大学)

J-GLOBAL ID
201901005938823895
researchmap会員ID
7000029491

経歴

 1

論文

 5
  • Yui Suganuma, Chiho Sumi-Ichinose, Taiki Kano, Kazuhisa Ikemoto, Taei Matsui, Hiroshi Ichinose, Kazunao Kondo
    Journal of Pharmacological Sciences 150 173-179 2022年6月  査読有り
  • Chiho Sumi-Ichinose, Yui Suganuma, Taiki Kano, Kazuhisa Ikemoto, Noriko Ihira, Hiroshi Ichinose, Kazunao Kondo
    Journal of Inherited Metabolic Disease 45(3) 621-634 2022年2月  査読有り
  • Kazuhisa Ikemoto, Chiho Sumi-Ichinose, Yui Suganuma, Taiki Kano, Noriko Ihira, Toshiharu Nagatsu, Kazunao Kondo
    The Journal of Biochemistry 2021年6月28日  
    <title>Abstract</title> Neopterin (NP), biopterin (BP) and monapterin (MP) exist in saliva. The physiological role of salivary NP as well as the pathophysiological role of increased NP in the immune-activated state has been unclear. Saliva is a characteristic specimen different from other body fluids. In this study, we analysed salivary NP and related pterin compounds, BP and MP and revealed some of its feature. High-performance liquid chromatography (HPLC) analysis of saliva and plasma obtained from 26 volunteers revealed that salivary NP existed mostly in its fully oxidized form. The results suggested that salivary NP as well as BP would mostly originate from the oral cavity, perhaps the salivary glands, and that salivary NP levels might not reflect those in the plasma. We also found that a gender difference existed in correlations between concentrations of salivary total concentrations of NP (tNP) and BP (tBP). HPLC analysis of saliva obtained from 5 volunteers revealed that the concentrations of salivary tNP as well as tBP fluctuated in an irregular fashion in various individuals. MP, a diastereomer of NP, might have come from oral cavity NP itself or its precursor. These results indicated that the nature of salivary NP might be different from that of NP in the blood or urine.
  • Taiki Kano, Kazunao Kondo, Jiharu Hamako, Fumio Matsushita, Kazuya Sakai, Taei Matsui
    International Journal of Hematology 108 1-6 2018年4月4日  査読有り
    Von Willebrand factor (VWF) is one of the plasma protein carrying ABO(H) blood group antigens, but the combining process of these antigens is not clear. In the present study, we examined whether plasma glycosyltransferase affects the blood group antigens on VWF. VWF expressing H-antigen (H-VWF) from blood group O and bovine serum albumin conjugated with H-antigen (H-BSA) were incubated with recombinant α1-3-N-acetylgalactosaminyltransferase (rA-transferase) and A-plasma with or without an additional UDP-GalNAc. Transformed antigens were detected by western blotting and ELISA, using an anti-A antibody. Both H-VWF and H-BSA acquired the A-antigen after incubation with rA-transferase and UDP-GalNAc. Incubation with A-plasma very weakly converted the H-antigen on BSA and VWF to A-antigen only in the presence of supplemented UDP-GalNAc. This conversion was enhanced on desialylation of H-VWF. These results indicate that sugar chains of plasma VWF can be modified by the external glycosyltransferase, but that plasma glycosyltransferase has no effect on the blood group antigens of VWF due to its low activity and the lack of donor sugars. Further, sialic acid residues of VWF may exert a protective effect against post-translational glycosylation. Our results clearly exclude the possibility that blood group antigens of VWF are constructed extracellularly in plasma.
  • Chiho Sumi-Ichinose, Yui Suganuma, Taiki Kano, Noriko Ihira, Hiroko Nomura, Kazuhisa Ikemoto, Tadayoshi Hata, Setsuko Katoh, Hiroshi Ichinose, Kazunao Kondo
    Physiological Reports 5(6) e13196 2017年3月1日  査読有り
    (6R)-l-erythro-5,6,7,8-Tetrahydrobiopterin (BH4) is an essential cofactor for monoamine and nitric oxide (NO) production. Sepiapterin reductase (SPR) catalyzes the final step in BH4 biosynthesis. We analyzed the cardiovascular function of adult Spr gene-disrupted (Spr−/−) mice for the first time. After weaning, Spr−/− mice suffered from hypertension with fluctuation and bradycardia, while the monoamine contents in these mice were less than 10% of those in the wild-type mice as a result of BH4 depletion. Heart rate variability analysis indicated the sympathetic dominant state in Spr−/− mice. The endothelium-dependent vascular relaxation in response to acetylcholine was significantly impaired in Spr−/− mice after sexual maturation (above 4 months old). Protein amounts of α1 adrenergic receptor and eNOS in the aorta were not altered. Spr−/− mice exhibited hypoglycemia and elevation of plasma renin activity. Our results suggest that the hypertension with fluctuation and bradycardia of Spr−/− mice would be caused by an imbalance of sympathetic and parasympathetic input and impaired nitric oxide production in endothelial cells. We suggest an important role of BH4 and SPR in age-related hypertension and a possible relationship with the cardiovascular instabilities in autonomic diseases, including Parkinson's disease and spinal cord injury.

MISC

 10

講演・口頭発表等

 60