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  • Articles  (30)
  • American Association for the Advancement of Science (AAAS)  (17)
  • Molecular Diversity Preservation International  (13)
  • Medicine  (30)
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  • Articles  (30)
  • 1
    Publication Date: 1998-11-30
    Description: Helical polyacetylene was synthesized under an asymmetric reaction field consisting of chiral nematic (N*) liquid crystals (LCs). The chiral nematic LC was prepared by adding a chiroptical binaphthol derivative as a chiral dopant to a mixture of two nematic LCs. Acetylene polymerizations were carried out using the catalyst titanium tetra-n-butoxide-triethylaluminum dissolved in the chiral nematic LC solvent. The polyacetylene film was shown by scanning electron microscopy to consist of clockwise or counterclockwise helical structure of fibrils. A Cotton effect was observed in the region of the pi --〉 pi* transition of the polyacetylene chain in circular dichroism spectra. The high electrical conductivities of approximately 1500 to 1800 siemens per centimeter after iodine doping and the chiral helicity of these films may be exploited in electromagnetic and optical applications.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Akagi -- Piao -- Kaneko -- Sakamaki -- Shirakawa -- Kyotani -- New York, N.Y. -- Science. 1998 Nov 27;282(5394):1683-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉K. Akagi, G. Piao, H. Shirakawa, Institute of Materials Science and Center of Tsukuba Advanced Research Alliance, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan. S. Kaneko, K. Sakamaki, Institute of Materials Science, University of Tsukuba, T.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9831554" target="_blank"〉PubMed〈/a〉
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2000-08-01
    Description: The physiological role of striatal cholinergic interneurons was investigated with immunotoxin-mediated cell targeting (IMCT). Unilateral cholinergic cell ablation caused an acute abnormal turning behavior. These mice showed gradual recovery but displayed abnormal turning by both excess stimulation and inhibition of dopamine actions. In the acute phase, basal ganglia function was shifted to a hyperactive state by stimulation and suppression of striatonigral and striatopallidal neurons, respectively. D1 and D2 dopamine receptors were then down-regulated, relieving dopamine-predominant synaptic perturbation but leaving a defect in controlling dopamine responses. The acetylcholine-dopamine interaction is concertedly and adaptively regulated for basal ganglia synaptic integration.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaneko, S -- Hikida, T -- Watanabe, D -- Ichinose, H -- Nagatsu, T -- Kreitman, R J -- Pastan, I -- Nakanishi, S -- New York, N.Y. -- Science. 2000 Jul 28;289(5479):633-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, Kyoto University Faculty of Medicine, Kyoto 606-8501, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10915629" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcholine/*metabolism ; Animals ; Apomorphine/pharmacology ; Basal Ganglia/cytology/*physiology ; Choline O-Acetyltransferase/metabolism ; Corpus Striatum/cytology/*physiology ; Dopamine/*metabolism ; Dopamine Agonists/pharmacology ; Down-Regulation ; Enkephalins/genetics/metabolism ; Immunotoxins ; Interneurons/*physiology ; Mice ; Mice, Transgenic ; Motor Activity ; Oxidopamine/pharmacology ; Posture ; Receptors, Dopamine D1/metabolism ; Receptors, Dopamine D2/metabolism ; Receptors, Glutamate/genetics/metabolism ; Substance P/genetics/metabolism ; Synapses/metabolism/*physiology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1997-12-31
    Description: Transgenic Drosophila that expressed either luciferase or green fluorescent protein driven from the promoter of the clock gene period were used to monitor the circadian clock in explanted head, thorax, and abdominal tissues. The tissues (including sensory bristles in the leg and wing) showed rhythmic bioluminescence, and the rhythms could be reset by light. The photoreceptive properties of the explanted tissues indicate that unidentified photoreceptors are likely to contribute to photic signal transduction to the clock. These results show that autonomous circadian oscillators are present throughout the body, and they suggest that individual cells in Drosophila are capable of supporting their own independent clocks.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Plautz, J D -- Kaneko, M -- Hall, J C -- Kay, S A -- MH-51573/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1997 Nov 28;278(5343):1632-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology and National Science Foundation Center for Biological Timing, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9374465" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Genetically Modified ; Biological Clocks/*physiology ; Brain/physiology ; Chemoreceptor Cells/physiology ; Circadian Rhythm/*physiology ; Darkness ; Drosophila/genetics/*physiology ; Drosophila Proteins ; Gene Expression Regulation ; Genes, Insect ; Green Fluorescent Proteins ; Light ; Light Signal Transduction ; Luciferases/genetics ; Luminescence ; Luminescent Proteins/genetics ; Nuclear Proteins/genetics/*physiology ; Period Circadian Proteins ; Photoreceptor Cells, Invertebrate/*physiology ; Promoter Regions, Genetic ; Receptors, Cell Surface ; Recombinant Fusion Proteins
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 1997-12-31
    Description: A lymphocyte subpopulation, the Valpha14 natural killer T (NKT) cells, expresses both NK1.1 and a single invariant T cell receptor encoded by the Valpha14 and Jalpha281 gene segments. Mice with a deletion of the Jalpha281 gene segment were found to exclusively lack this subpopulation. The Valpha14 NKT cell-deficient mice could no longer mediate the interleukin-12 (IL-12)-induced rejection of tumors. Although the antitumor effect of IL-12 was thought to be mediated through natural killer cells and T cells, Valpha14 NKT cells were found to be an essential target of IL-12, and they mediated their cytotoxicity by an NK-like effector mechanism after activation with IL-12.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cui, J -- Shin, T -- Kawano, T -- Sato, H -- Kondo, E -- Toura, I -- Kaneko, Y -- Koseki, H -- Kanno, M -- Taniguchi, M -- New York, N.Y. -- Science. 1997 Nov 28;278(5343):1623-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Core Research for Evolutional Science and Technology (CREST) Project, Japan Science and Technology Corporation (JST), 1-8-1 Inohana, Chuo-ku, Chiba, Japan 260.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9374462" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Anti-Bacterial Agents/pharmacology ; *Cytotoxicity, Immunologic ; Gene Deletion ; Gene Targeting ; Genes, RAG-1 ; Genes, T-Cell Receptor alpha ; Interferon-gamma/immunology ; Interleukin-12/*immunology ; Killer Cells, Natural/*immunology ; *Macrolides ; Melanoma, Experimental/immunology ; Mice ; Mice, Inbred C57BL ; Mice, Transgenic ; Neoplasms, Experimental/*immunology ; Poly I-C/pharmacology ; Proton-Translocating ATPases/antagonists & inhibitors ; Receptors, Antigen, T-Cell, alpha-beta/genetics/*immunology ; T-Lymphocyte Subsets/*immunology
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  • 5
    Publication Date: 1997-12-31
    Description: Natural killer T (NKT) lymphocytes express an invariant T cell antigen receptor (TCR) encoded by the Valpha14 and Jalpha281 gene segments. A glycosylceramide-containing alpha-anomeric sugar with a longer fatty acyl chain (C26) and sphingosine base (C18) was identified as a ligand for this TCR. Glycosylceramide-mediated proliferative responses of Valpha14 NKT cells were abrogated by treatment with chloroquine-concanamycin A or by monoclonal antibodies against CD1d/Vbeta8, CD40/CD40L, or B7/CTLA-4/CD28, but not by interference with the function of a transporter-associated protein. Thus, this lymphocyte shares distinct recognition systems with either T or NK cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kawano, T -- Cui, J -- Koezuka, Y -- Toura, I -- Kaneko, Y -- Motoki, K -- Ueno, H -- Nakagawa, R -- Sato, H -- Kondo, E -- Koseki, H -- Taniguchi, M -- New York, N.Y. -- Science. 1997 Nov 28;278(5343):1626-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉CREST (Core Research for Evolutional Science and Technology) Project, Japan Science and Technology Corporation (JST), 1-8-1 Inohana, Chuo, Chiba 260, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9374463" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD1/*immunology ; Carbohydrate Conformation ; Cells, Cultured ; Ceramides/chemistry/metabolism/*pharmacology ; Cerebrosides/chemistry/metabolism/*pharmacology ; Coculture Techniques ; Galactosylceramides/chemistry/metabolism/pharmacology ; Glucosylceramides/chemistry/metabolism/pharmacology ; Killer Cells, Natural/*immunology ; Ligands ; *Lymphocyte Activation ; Mice ; Mice, Inbred C57BL ; Mice, Transgenic ; Receptors, Antigen, T-Cell, alpha-beta/*immunology ; Structure-Activity Relationship ; T-Lymphocyte Subsets/*immunology
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  • 6
    Publication Date: 2008-11-22
    Description: Metabolic regulation in mammals requires communication between multiple organs and tissues. The rise in the incidence of obesity and associated metabolic disorders, including type 2 diabetes, has renewed interest in interorgan communication. We used mouse models to explore the mechanism whereby obesity enhances pancreatic beta cell mass, pathophysiological compensation for insulin resistance. We found that hepatic activation of extracellular regulated kinase (ERK) signaling induced pancreatic beta cell proliferation through a neuronal-mediated relay of metabolic signals. This metabolic relay from the liver to the pancreas is involved in obesity-induced islet expansion. In mouse models of insulin-deficient diabetes, liver-selective activation of ERK signaling increased beta cell mass and normalized serum glucose levels. Thus, interorgan metabolic relay systems may serve as valuable targets in regenerative treatments for diabetes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Imai, Junta -- Katagiri, Hideki -- Yamada, Tetsuya -- Ishigaki, Yasushi -- Suzuki, Toshinobu -- Kudo, Hirohito -- Uno, Kenji -- Hasegawa, Yutaka -- Gao, Junhong -- Kaneko, Keizo -- Ishihara, Hisamitsu -- Niijima, Akira -- Nakazato, Masamitsu -- Asano, Tomoichiro -- Minokoshi, Yasuhiko -- Oka, Yoshitomo -- New York, N.Y. -- Science. 2008 Nov 21;322(5905):1250-4. doi: 10.1126/science.1163971.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Molecular Metabolism and Diabetes, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19023081" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Proliferation ; Central Nervous System/metabolism ; Diabetes Mellitus, Experimental/metabolism ; Hyperplasia ; Insulin/metabolism ; Insulin Resistance ; Insulin-Secreting Cells/*metabolism/pathology ; Liver/*metabolism ; MAP Kinase Kinase 1/*metabolism ; *MAP Kinase Signaling System ; Male ; Mice ; Mice, Inbred C57BL ; Neurons/*metabolism ; Obesity/*metabolism ; Pancreas/innervation ; Recombinant Proteins/metabolism ; Vagus Nerve/cytology/metabolism ; Xenopus
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  • 7
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2012-10-16
    Description: During development, cells undergo a unidirectional course of differentiation that progressively decreases the number of cell types they can potentially become. Stem cells, however, keep their potential to both proliferate and differentiate. A very important issue then is to understand the characteristics that distinguish stem cells from other cell types and allow them to conduct stable proliferation and differentiation. Here, we review relevant dynamical-systems approaches to describe the state transition between stem and differentiated cells, with an emphasis on fluctuating and oscillatory gene expression levels, as these represent the specific properties of stem cells. Relevance between recent experimental results and dynamical-systems descriptions of stem cell differentiation is also discussed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Furusawa, Chikara -- Kaneko, Kunihiko -- New York, N.Y. -- Science. 2012 Oct 12;338(6104):215-7. doi: 10.1126/science.1224311.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Quantitative Biology Center, RIKEN, Osaka, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23066073" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Communication ; Cell Differentiation/*genetics ; *Epigenesis, Genetic ; *Gene Expression ; Molecular Dynamics Simulation ; Stem Cells/*cytology
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  • 8
    Publication Date: 2003-05-24
    Description: Meiosis is a critical stage of gametogenesis in which alignment and synapsis of chromosomal pairs occur, allowing for the recombination of maternal and paternal genomes. Here we show that FK506 binding protein (Fkbp6) localizes to meiotic chromosome cores and regions of homologous chromosome synapsis. Targeted inactivation of Fkbp6 in mice results in aspermic males and the absence of normal pachytene spermatocytes. Moreover, we identified the deletion of Fkbp6 exon 8 as the causative mutation in spontaneously male sterile as/as mutant rats. Loss of Fkbp6 results in abnormal pairing and misalignments between homologous chromosomes, nonhomologous partner switches, and autosynapsis of X chromosome cores in meiotic spermatocytes. Fertility and meiosis are normal in Fkbp6 mutant females. Thus, Fkbp6 is a component of the synaptonemal complex essential for sex-specific fertility and for the fidelity of homologous chromosome pairing in meiosis.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2882960/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2882960/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Crackower, Michael A -- Kolas, Nadine K -- Noguchi, Junko -- Sarao, Renu -- Kikuchi, Kazuhiro -- Kaneko, Hiroyuki -- Kobayashi, Eiji -- Kawai, Yasuhiro -- Kozieradzki, Ivona -- Landers, Rushin -- Mo, Rong -- Hui, Chi-Chung -- Nieves, Edward -- Cohen, Paula E -- Osborne, Lucy R -- Wada, Teiji -- Kunieda, Tetsuo -- Moens, Peter B -- Penninger, Josef M -- 38103/Canadian Institutes of Health Research/Canada -- New York, N.Y. -- Science. 2003 May 23;300(5623):1291-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Molecular Biotechnology of the Austrian Academy of Sciences (IMBA), c/o Dr. Bohrgasse 7, 1030, Vienna, Austria.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12764197" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Apoptosis ; Chromosome Pairing/*physiology ; Cloning, Molecular ; Exons ; Female ; Fertility/*physiology ; Gene Targeting ; Humans ; Infertility, Male/genetics/*physiopathology ; Male ; *Meiosis ; Mice ; Molecular Sequence Data ; Mutation ; Nuclear Proteins/genetics/metabolism ; Oogenesis ; Ovary/physiology ; Prophase ; Rats ; Sequence Deletion ; Spermatids/physiology ; Spermatocytes/physiology/ultrastructure ; Spermatogenesis ; Synaptonemal Complex/*physiology ; Tacrolimus Binding Proteins/chemistry/*genetics/*physiology ; Testis/physiology ; X Chromosome/physiology
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  • 9
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2004-01-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tanabe, K -- Sakihama, N -- Kaneko, A -- New York, N.Y. -- Science. 2004 Jan 23;303(5657):493.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Osaka Institute of Technology, Osaka 535-8585, Japan. kztanabe@ge.oit.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14739451" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Sequence ; Animals ; Antigens, Protozoan/chemistry/*genetics ; Antimalarials/pharmacology ; Chloroquine/pharmacology ; Drug Resistance ; Epitopes/genetics ; Genes, Protozoan ; Geography ; Haplotypes ; Humans ; Malaria, Falciparum/parasitology ; Membrane Proteins/chemistry/genetics ; Membrane Transport Proteins ; Merozoite Surface Protein 1/chemistry/genetics ; Molecular Sequence Data ; Plasmodium falciparum/drug effects/*genetics/*immunology ; *Polymorphism, Single Nucleotide ; Protozoan Proteins/chemistry/genetics ; Repetitive Sequences, Nucleic Acid ; Tandem Repeat Sequences ; Vanuatu
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  • 10
    Publication Date: 2002-01-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Inoue, Kimiko -- Kohda, Takashi -- Lee, Jiyoung -- Ogonuki, Narumi -- Mochida, Keiji -- Noguchi, Yoko -- Tanemura, Kentaro -- Kaneko-Ishino, Tomoko -- Ishino, Fumitoshi -- Ogura, Atsuo -- New York, N.Y. -- Science. 2002 Jan 11;295(5553):297.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Veterinary Science, National Institute of Infectious Diseases, 1-23-1, Toyama, Shinjuku, Tokyo 162-8640, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11786635" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cloning, Organism ; Embryo Transfer ; Embryonic and Fetal Development ; Female ; Fetus/*metabolism ; Fibroblasts ; *Gene Expression ; Gene Expression Profiling ; *Genomic Imprinting ; Male ; Mice ; Mice, Inbred C57BL ; Nuclear Transfer Techniques ; Ovarian Follicle/cytology ; Placenta/*metabolism ; RNA, Messenger/genetics/metabolism ; Sertoli Cells
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