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Yuki Kanase Takafumi Kitada Hidetsugu Tabata Kosho Makino Tetsuta Oshitari Hiromi Ohashi Takashi Yoshinaga Hideaki Natsugari Hideyo Takahashi 《Bioorganic & medicinal chemistry》2018,26(9):2508-2513
The physicochemical properties of 4-substituted carbamazepine derivatives were investigated. It was elucidated that the 4-substitution is not effective in reducing the rotations (E/Z) about the N—C1′ axes around the outer carbamoyl moiety. However, the atropisomers were isolated with high stereochemical stability, meaning that the 4-substitution reduced the butterfly motion of the tricyclic ring system efficiently. The Cl/CH3-substituted carbamazepine derivatives showed greater inhibitory effects on hNav1.2 channel currents compared with carbamazepine, although no difference in the activity between enantiomers was observed. 相似文献
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Kazuyuki Hiramoto Akiko Nasuhara Kae Michikoshi Tetsuta Kato Kiyomi Kikugawa 《Mutation Research - Genetic Toxicology and Environmental Mutagenesis》1997,395(1):4636
Aqueous solution of glucose and glycine was heated under reflux for 4 h and extracted with ethyl acetate. Reversed phase HPLC of the extract revealed a new DNA strand-breaking substance, which was purified by repeated HPLC and identified as 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one (DDMP). DDMP induced DNA strand breaking in a dose- and time-dependent manner. It was active to break DNA strands at pH 7.4 and 9.4. Its pyranone skeleton was destroyed at the pH values. DNA strand breaking by DDMP was inhibited by superoxide dismutase, catalase, scavengers for hydroxyl radical, spin trapping agents and metal chelators, and the breaking was enhanced by Fe(III) ion. A mixture of DDMP and a spin trap DMPO gave electron spin resonance signals of a spin adduct DMPO-OH, indicating generation of hydroxyl radical. DDMP was found to be mutagenic to Salmonella typhimurium TA100 without metabolic activation. These results show DDMP generated active oxygen species to cause DNA strand breaking and mutagenesis. 相似文献
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Oshitari T Okuyama Y Miyata Y Kosano H Takahashi H Natsugari H 《Bioorganic & medicinal chemistry letters》2011,21(15):4540-4544
A divergent synthesis of nobiletin metabolites was developed through highly oxygenated acetophenone derivative. We used commercially available methyl 3,4,5-trimethoxybenzoate as a starting material for concise preparation of the key intermediate, 2′-hydroxy-3′,4′,5′,6′-tetramethoxyacetophenone (I). These metabolites showed strong inhibitory activity against matrix metalloproteinase-9 production in human lens epithelial cells. 相似文献
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Yoshiki Miyata Tetsuta Oshitari Yuji Okuyama Arata Shimada Hideyo Takahashi Hideaki Natsugari Hiroshi Kosano 《Bioorganic & medicinal chemistry letters》2013,23(1):183-187
Posterior capsular opacification (PCO) is the most frequent complication and the primary reason for visual decrease after extracapsular cataract surgery. The proliferation and migration of leftover lens epithelial cells (LECs) after surgery may contribute to the development of PCO. To prevent PCO, a rational approach would be to inhibit both the proliferation and the migration of LECs using nontoxic xenobiotics. Nobiletin, one of the most abundant polymethoxyflavones (PMFs) in citrus peel, and its synthetic congeners displayed a potent inhibition of LEC proliferation. Structural features which enhance anti-proliferative activity have also been discussed. 相似文献
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Tetsuta Kato Kae Michikoshi Yu-ichi Minowa Yoshiko Maeda Kiyomi Kikugawa 《Mutation Research - Genetic Toxicology and Environmental Mutagenesis》1998,420(1-3)
Addition of onion effectively reduced mutagenicity of cooked hamburger when tested on Salmonella typhimurium TA98 strain with metabolic activation. The components of onion that participated in the reduction of mutagenicity were sugars. Addition of starch or glucose to ground beef the amount equivalent to that in onion reduced the mutagenicity of cooked hamburger. Addition of onion may cause imbalance of the sugar content of ground beef that effectively produces mutagenicity. Mutagenicity of the heated model mixture of glucose/glycine/creatinine in diethyleneglycol–water was reduced by an excessive amount of glucose. Hence, Japanese cooking-style with addition of onion can reduce mutagenicity of hamburger. 相似文献
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Takayuki Ohtomo Atsuko Hoshino Masako Yajima Akiharu Tsuchiya Atsushi Momose Kouichi Tanonaka Hiroo Toyoda Tetsuta Kato Junji Yamada 《Histochemistry and cell biology》2013,140(2):223-232
Acyl-CoA thioesterases (Acots) are enzymes that catalyze the hydrolysis of fatty acyl-CoAs to free fatty acids and coenzyme A, and have the potential to regulate the intracellular levels of these molecules. In this study, we show that a cytosolic isoform, Acot1, is expressed and distributed in immature adipocytes located in the perivascular region of the white adipose tissue (WAT) of rats. Immunoblot analyses detected Acot1 in all of the WATs examined, while immunohistochemistry revealed positively stained layered structures surrounding the adventitia of blood vessels in the subcutaneous WAT. When the subcutaneous WAT was digested with collagenase and centrifuged, Acot1 was recovered in the stromal vascular fraction (SVF), and not in the large mature adipocytes. In the SVF, undigested cells attached to short tubular fragments of blood vessels showed positive immunostaining, as well as a proportion of the dispersed cells. These fibroblast-like cells contained fine particulate lipid droplets, stained by oil-red O dye, in their cytoplasm, or expressed fatty acid-binding protein 4, an adipocyte marker. After induction of adipocyte differentiation following a 15-day preculture without insulin, the dedifferentiated cells showed increased Acot1 expression with a diffuse distribution throughout the cytosol. These findings suggest that Acot1 expression is transiently upregulated at an early stage of adipocyte maturation, possibly to maintain cytosolic acyl-CoAs below a certain level until the cells acquire their full capability for fat storage. 相似文献
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