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- 저자 : Shizuo Yamada (검색결과 3 건)
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Shizuo Yamada,Shiori Kuraoka,Yoshihiko Ito 대한배뇨장애요실금학회 2012 International Neurourology Journal Vol.16 No.3
The in vivo muscarinic receptor binding of antimuscarinic agents (oxybutynin, solifenacin, tolterodine, and imidafenacin) used to treat urinary dysfunction in patients with overactive bladder is reviewed. Transdermal administration of oxybutynin in rats leads to significant binding of muscarinic receptors in the bladder without long-term binding in the submaxillary gland and the abolishment of salivation evoked by oral oxybutynin. Oral solifenacin shows significant and long-lasting binding to muscarinic receptors in mouse tissues expressing the M3 subtype. Oral tolterodine binds more selectively to muscarinic receptors in the bladder than in the submaxillary gland in mice. The muscarinic receptor binding of oral imidafenacin in rats is more selective and longer-lasting in the bladder than in other tissues such as the submaxillary gland, heart, colon, lung, and brain, suggesting preferential muscarinic receptor binding in the bladder. In vivo quantitative autoradiography with (+)N-[11C]methyl-3-piperidyl benzilate in rats shows significant occupancy of brain muscarinic receptors with the intravenous injection of oxybutynin, solifenacin, and tolterodine. The estimated in vivo selectivity in brain is significantly greater for solifenacin and tolterodine than for oxybutynin. Imidafenacin occupies few brain muscarinic receptors. Similar findings for oral oxybutynin were observed with positron emission tomography in conscious rhesus monkeys with a significant disturbance of short-term memory. The newer generation of antimuscarinic agents may be advantageous in terms of bladder selectivity after systemic administration.
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Effect of Royal Jelly on Mouse Isolated Ileum and Gastrointestinal Motility
Shino Miyauchi-Wakuda,Satomi Kagota,Kana Maruyama-Fumoto,Hirokazu Wakuda,Shizuo Yamada,Kazumasa Shinozuka 한국식품영양과학회 2019 Journal of medicinal food Vol.22 No.8
Green tea is reported to exert beneficial effects on metabolic disorders through the regulation of lipid metabolism. On the contrary, fermented food products have been introduced to improve human health by modulating immune response and energy metabolism. To maximize health benefit, we applied fermentation processing to green tea. Fermented green tea extract (FGT) inhibited adipogenesis and lipogenesis in cultured adipocytes, whereas it augmented mRNA expression of fatty acid oxidation-related genes in differentiated myocytes. In diet-induced obese mice, FGT blunted body weight and fat mass gain by 69.7% and 56.7%, respectively. FGT also improved circulating triglyceride concentrations by 32.6%. Similar to in vitro results, FGT suppressed lipogenesis and promoted lipid catabolism in peripheral tissues. In addition, FGT administration modulated the composition of certain gut microbiota which are associated with obesity and related metabolic disorders. Among the various components of FGT, gallocatechin gallate is suggested to mediate the effect of FGT on lipid metabolism. Taken together, we propose FGT as a novel functional food to benefit human health by controlling adiposity and lipid metabolism.
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Hisae Oku,Fumika Kitagawa,Yoshihisa Kato,Tomoya Miyashita,Masaomi Hara,Toshitaka Minetoki,Shizuo Yamada 한국식품영양과학회 2021 Journal of medicinal food Vol.24 No.5
We evaluated the effects of unripe mandarin orange (Citrus unshiu) extract powder (unripe mandarin extract powder [UMEP]) treated with subcritical water on allergic diseases by using animal models. High performance liquid chromatography (HPLC) analysis revealed that subcritical water is a more effective solvent than alcohol and hot water, as it quickly extracted approximately 90% of the functional compounds narirutin (1) and hesperidin (2) from whole fruits. Repeated oral administration of UMEP significantly reversed the peripheral blood flow decline observed during the promotion of allergies after sensitization with the antigen, hen egg-white lysozyme (HEL). UMEP also significantly inhibited compound 48/80-induced scratching behavior in HEL-sensitized mice, which are more sensitive to itching stimuli than are normal mice, without suppressing locomotor activity. In addition, repeated oral administration of UMEP in ovalbumin-challenged guinea pigs significantly suppressed the late phase of nasal airway resistance. This study provides evidence that the subcritical water extract powder of unripe C. unshiu fruit is an effective anti-allergic functional food.
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