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11.
Ulla Seibel-Ehlert Nicole Plank Asuka Inoue Guenther Bernhardt Andrea Strasser 《International journal of molecular sciences》2021,22(18)
G protein activation represents an early key event in the complex GPCR signal transduction process and is usually studied by label-dependent methods targeting specific molecular events. However, the constrained environment of such “invasive” techniques could interfere with biological processes. Although histamine receptors (HRs) represent (evolving) drug targets, their signal transduction is not fully understood. To address this issue, we established a non-invasive dynamic mass redistribution (DMR) assay for the human H1–4Rs expressed in HEK cells, showing excellent signal-to-background ratios above 100 for histamine (HIS) and higher than 24 for inverse agonists with pEC50 values consistent with literature. Taking advantage of the integrative nature of the DMR assay, the involvement of endogenous Gαq/11, Gαs, Gα12/13 and Gβγ proteins was explored, pursuing a two-pronged approach, namely that of classical pharmacology (G protein modulators) and that of molecular biology (Gα knock-out HEK cells). We showed that signal transduction of hH1–4Rs occurred mainly, but not exclusively, via their canonical Gα proteins. For example, in addition to Gαi/o, the Gαq/11 protein was proven to contribute to the DMR response of hH3,4Rs. Moreover, the Gα12/13 was identified to be involved in the hH2R mediated signaling pathway. These results are considered as a basis for future investigations on the (patho)physiological role and the pharmacological potential of H1–4Rs. 相似文献
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Susumu Miura Asuka Ogawa Hiroaki Konishi 《Journal of the American Oil Chemists' Society》1999,76(8):927-931
A rapid method for synthesis and purification of the structured triacylglycerol (TAG), 1,3-dilauroyl-2-oleoylglycerol (LaOLa),
has been developed. A fraction containing 70% LaOLa was obtained by enzymatic transesterification between triolein and lauric
acid using Lipozyme IM, which has 1,3-regioselectivity on the glycerol moiety of TAG. The fraction was passed through a Bond
Elut SI Column to remove mono-and diacylglycerols produced during the transesterification. The TAG fraction thus obtained
was applied to a reversed-phase column, eluted with acetonitrile/tetrahydrofuran (8:2, vol/vol) to separate different TAG
species. The LaOLa fraction obtained by this method was of greater than 99% purity. The concentrations of total fatty acids
and fatty acids bound to the sn-2 position of this LaOLa fraction were determined by gas-liquid chromatography after hydrolysis by pancreatic lipase, to
confirm the purity of stereospecific isomers in this fraction. The final purity of LaOLa was found to be greater than 95%,
which was in good agreement with the result obtained by high-performance liquid chromatography using a Lichrosorb Si60 argentated
column. 相似文献
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Teo Nozaki Yuji Hatano Eriko Yamakawa Asuka Hachikawa Kazuyoshi Ichinose 《International Journal of Hydrogen Energy》2010
Hafnium nitride (HfN) was chosen as a material for non-porous intermediate layer to improve the high temperature stability of Pd–Ta composite membranes for hydrogen separation. A layer of dense HfN (70 nm) was prepared between Ta substrate and thin Pd film (300 nm), and the high temperature stability of Pd coating was examined by hydrogen absorption experiments at 573 K after the heat treatments at 873 and 973 K. The HfN layer showed obvious hydrogen permeability, though the permeation rate in HfN appeared to be smaller than that in Pd and Ta. In addition, the degradation in coating effects of Pd at elevated temperatures was substantially retarded by HfN layer. Such improved stability was ascribed to retardation of open porosity development in Pd films and interdiffusion between Pd and Ta. It was concluded that HfN is a potential candidate material for intermediate layer to improve high temperature stability of Pd-group 5 metal composite hydrogen separation membranes. 相似文献
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Haruka Egawa OoyamaHiroharu Yamasaki Asuka HaradaYuki Nagahama Ayumi OnoKatsuhira Yoshida 《Dyes and Pigments》2012,94(1):103-112
Novel symmetric polycyclicphenazine-type fluorescent dyes have been synthesized and characterized in solution and in polymer films. The dyes exhibited two strong absorption bands at around 365-428 nm and 519-567 nm and an intense fluorescence band at around 560-600 nm (Ф = 0.70-0.87) in 1,4-dioxane. The dye-doped polymer films showed excellent wavelength conversion function that efficiently convert ultraviolet and yellow lights into red light (Ф = 0.61-0.92). Moreover, the photostability of the dye-doped PS, PMMA, and PLA films has been investigated. 相似文献
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Yuka Muranaka Asuka Mizutani Masato Kobayashi Koya Nakamoto Miki Matsue Kodai Nishi Kana Yamazaki Ryuichi Nishii Naoto Shikano Shigefumi Okamoto Keiichi Kawai 《International journal of molecular sciences》2022,23(5)
The effectiveness of L- and D-amino acids for detecting the early stage of infection in bacterial imaging was compared. We evaluated the accumulation of 3H-L-methionine (Met), 3H-D-Met, 3H-L-alanine (Ala), and 3H-D-Ala in E. coli EC-14 and HaCaT cells. Biological distribution was assessed in control and lung-infection-model mice with EC-14 using 3H-L- and D-Met, and 18F-FDG. A maximum accumulation of 3H-L- and D-Met, and 3H-L- and D-Ala occurred in the growth phase of EC-14 in vitro. The accumulation of 3H-L-Met and L-Ala was greater than that of 3H-D-Met and D-Ala in both EC-14 and HaCaT cells. For all radiotracers, the accumulation was greater in EC-14 than in HaCaT cells at early time points. The accumulation was identified at 5 min after injection in EC-14, whereas the accumulation gradually increased in HaCaT cells over time. There was little difference in biodistribution between 3H-L-and D-Met except in the brain. 3H-L- and D-Met were sensitive for detecting areas of infection after the spread of bacteria throughout the body, whereas 18F-FDG mainly detected primary infection areas. Therefore, 11C-L- and D-Met, radioisotopes that differ only in terms of 3H labeling, could be superior to 18F-FDG for detecting bacterial infection in lung-infection-model mice. 相似文献
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Quantitative deviating effects of maple syrup extract supplementation on the hepatic gene expression of mice fed a high‐fat diet 下载免费PDF全文