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71.
Yoshiyuki Manabe Satomi Kasahara Yohei Takakura Xiaoxiao Yang Shinji Takamatsu Yoshihiro Kamada Eiji Miyoshi Daisuke Yoshidome Koichi Fukase 《Bioorganic & medicinal chemistry》2017,25(11):2844-2850
We developed α1,6-fucosyltransferase (FUT8) inhibitors through a diversity-oriented synthesis. The coupling reaction between the fucose unit containing alkyne and the guanine unit containing sulfonyl azide under various conditions afforded a series of Guanosine 5′-diphospho-β-l-fucose (GDP-fucose) analogs. The synthesized compounds displayed FUT8 inhibition activity. A docking study revealed that the binding mode of the inhibitor synthesized with FUT8 was similar to that of GDP-fucose. 相似文献
72.
A new species of Erysiphe sect. Uncinula is described and illustrated from Patagonia, Argentina. Erysiphe patagoniaca sp. nov., found on leaves of Nothofagus × antarctica, is similar to E. nothofagi and E. kenjiana, but differs in its appendages being twisted throughout their length and the number of appendages, asci, and ascospores.
The two endemic species of Erysiphe sect. Uncinula, E. magellanica and E. nothofagi, coexisted on the same leaves together with Erysiphe patagoniaca.
Received: September 19, 2002 / Accepted: November 28, 2002
Acknowledgments The authors are grateful to Ms. Seiko Niinomi for providing the micrographs of ascomata of Erysiphe spp. on Nothofagus.
Correspondence to:S. Takamatsu 相似文献
73.
Yoshinori Harada Ping Dai Yoshihisa Yamaoka Mitsugu Ogawa Hideo Tanaka Kazuto Nosaka Kenichi Akaji Tetsuro Takamatsu 《Histochemistry and cell biology》2009,132(1):39-46
Most molecular imaging technologies require exogenous probes and may have some influence on the intracellular dynamics of
target molecules. In contrast, Raman scattering light measurement can identify biomolecules in their innate state without
application of staining methods. Our aim was to analyze intracellular dynamics of topoisomerase I inhibitor, CPT-11, by using
slit-scanning confocal Raman microscopy, which can take Raman images with high temporal and spatial resolution. We could acquire
images of the intracellular distribution of CPT-11 and its metabolite SN-38 within several minutes without use of any exogenous
tags. Change of subcellular drug localization after treatment could be assessed by Raman imaging. We also showed intracellular
conversion from CPT-11 to SN-38 using Raman spectra. The study shows the feasibility of using slit-scanning confocal Raman
microscopy for the non-labeling evaluation of the intracellular dynamics of CPT-11 with high temporal and spatial resolution.
We conclude that Raman spectromicroscopic imaging is useful for pharmacokinetic studies of anticancer drugs in living cells.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
74.
Suzuki T Matsunami T Hisa Y Takata K Takamatsu T Oyamada M 《Histochemistry and cell biology》2009,131(1):89-102
Despite the importance of glucose metabolism for auditory function, the mechanisms of glucose transport in the cochlea are
not completely understood. We hypothesized that gap junctions mediate intercellular glucose transport in the cochlea in cooperation
with facilitative glucose transporter 1 (GLUT1). Immunohistochemistry showed that GLUT1 and the tight junction protein occludin
were expressed in blood vessels, and GLUT1, the gap junction proteins connexin26 and connexin30, and occludin were also present
in strial basal cells in the lateral wall of the rat cochlea. Gap junctions were found among not only these GLUT1-positive
strial basal cells but also GLUT1-negative fibrocytes in the spiral ligaments and strial intermediate cells. Glucose imaging
using 6-[N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino]-6-deoxyglucose (6-NBDG, MW 342) together with Evans Blue Albumin (EBA,
MW 68,000) showed that 6-NBDG was rapidly distributed throughout the stria vascularis and spiral ligament, whereas EBA was
localized only in the vessels. The gap junctional uncouplers heptanol and carbenoxolone inhibited the distribution of 6-NBDG
in the spiral ligament without decreasing the fluorescence of EBA in the blood vessels. These findings suggest that gap junctions
mediate glucose transport from GLUT1-positive cells (strial basal cells) to GLUT1-negative cells (fibrocytes in the spiral
ligament and strial intermediate cells) in the cochlea. 相似文献
75.
Ken-ichi Morishita Nobumasa Yakushiji Fuminori Ohsawa Kayo Takamatsu Nobuyasu Matsuura Makoto Makishima Masatoshi Kawahata Kentaro Yamaguchi Akihiro Tai Kenji Sasaki Hiroki Kakuta 《Bioorganic & medicinal chemistry letters》2009,19(3):1001-1003
Retinoid X receptor (RXR) ligands are attractive candidates for clinical application because of their activity against tamoxifen-resistant breast cancer, taxol-resistant lung cancer, metabolic syndrome, and allergy. Though several RXR ligands, especially RXR antagonists, have been reported, the rational molecular design of such compounds is not well advanced. 4-[N-Methanesulfonyl-N-(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-2-naphthyl)amino]nicotinic acid (5a) is a moderately RXRα-preferential agonist, and we examined the feasibility of replacing the methyl group on the sulfonamide with a longer alkyl chain or an aromatic ring as an approach to produce new RXR antagonists. Several of the resulting benzenesulfonanilide-type compounds showed RXR antagonist activity. This design strategy should be a useful approach for addressing the lack of structure diversity of RXR antagonists. 相似文献
76.
Yuko Arie Masumi Iketani Ken Takamatsu Yoshio Goshima 《Biochemical and biophysical research communications》2009,379(1):11-3034
Intracellular calcium ions (Ca2+) have an essential role in the regulation of neurite outgrowth, but how outgrowth is controlled remains largely unknown. In this study, we examined how the mechanisms of neurite outgrowth change during development in chick and mouse dorsal root ganglion neurons. 2APB, a potent inhibitor of inositol 1,4,5-trisphosphate (IP3) receptors (IP3R), inhibited neurite outgrowth at early developmental stages, but not at later stages. In contrast, pharmacological inhibition with Ni2+, Cd2+, or dantrolene revealed that ryanodine receptor (RyR)-mediated Ca2+-induced Ca2+ release (CICR) was involved in neurite outgrowth at later stage, but not at early stages. The distribution of IP3R and RyR in growth cones also changed during development. Furthermore, pharmacological inhibition of the Ca2+-calmodulin-dependent phosphatase calcineurin with FK506 reduced neurite outgrowth only at early stages. These data suggest that the calcium signaling that regulates neurite outgrowth may change during development from an IP3R-mediated pathway to a RyR-mediated pathway. 相似文献
77.
Vasyl Heluta Susumu Takamatsu Svitlana Voytyuk Yoshiaki Shiroya 《Mycological Progress》2009,8(4):367-375
An Asian powdery mildew fungus Erysiphe (Uncinula) kenjiana (Erysiphales, Ascomycota) has been found in Ukraine. This is the first record of this fungus in Europe. In 2007, E. kenjiana was collected on four Ulmus species in Kiev. All locations adjoined railways or an airport. Development of E. kenjiana was epiphytotic. This species was not found on elms surveyed at towns situated north-east, east or south of Kiev. The fungus
may have been brought directly to Ukraine by rail or air transport. In 2008, the fungus was also collected in Chernihiv situated
north-east of Kiev. It is likely that E. kenjiana will spread over all Ukraine and into countries of central and western Europe in 2009 or later. Molecular phylogenetic analyses
using D1/D2 domains of the 28S rDNA and ITS sequences revealed that the Ulmaceae-Cannabaceae-parasitic powdery mildews, including
E. kenjiana, form a clade with strong supports, suggesting that these species diverged from a single ancestor and expanded their host
ranges within the Ulmaceae and allied Cannabaceae. This hypothesis is supported by these species sharing the unique morphology
of enlarged apices on their chasmothecial appendages. These fungi formed part of a larger grouping with species on Fagaceae,
Nothofagaceae, Rosaceae, and Sapindaceae with strong statistical supports. These results suggest that Uncinula-like powdery mildew fungi on these plant families exhibit close evolutionary relationships with their hosts. 相似文献
78.
Shinji Ohsawa Takeshi Saito Shin Yoshikawa Hideo Mawatari Makoto Yamada Kazuhiro Amita Nobuki Takamatsu Yasuaki Sudo Tsuneomi Kagiyama 《Limnology》2010,11(3):207-215
One feature of volcanic lakes influenced by subaqueous fumaroles existing at lake bottoms (called active crater lakes) is
the remarkable color of their waters: turquoise or emerald green. The active crater lake named Yudamari at Mt. Nakadake of
Aso volcano, Japan, takes on a milky pale blue-green. The particular blue component of the lake water color results from Rayleigh
scattering of sunlight by very fine aqueous colloidal sulfur particles; the green component is attributable to absorption
of sunlight by dissolved ferrous ions. An objective color observation conducted during 2000–2007 revealed that the lake water
color changed from blue-green to solid green. The disappearance of the blue ingredient of the water color will result in diminution
of aqueous colloidal sulfur from chemical analyses of lake waters sampled simultaneously. The aqueous sulfur is produced by
the reaction of sulfur dioxide and hydrogen sulfide supplied from subaqueous fumaroles. However, its production efficiency
decreases by domination of sulfur dioxide in the subaqueous fumarolic sulfur gas species with increasing subaqueous fumarolic
temperature. The disappearance of blue ingredients from the blue-green color of the lake water may be attributed to activation
of subaqueous fumarole activity. 相似文献
79.
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