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pubmed-article:20566754pubmed:abstractTextSphingosine-1-phosphate (S1P), a potent lipid mediator, transduces intracellular signals through the activation of S1P receptors (S1PRs). Although S1PRs have been shown to play an important role in the central nervous system (CNS), accurate localization and the function of S1PR1 in the human CNS are still unclear. In this study, we investigated the localization of S1PR1 in the human CNS of postmortem samples, using a rabbit polyclonal antibody, the specificity of which had been well defined. Immunohistochemical investigation of paraffin-embedded sections revealed diffuse granular staining of the gray matter. The signals of the gray matter were much stronger than those of the white matter. The immunohistochemical expression levels correlated well with the results of quantitative real-time RT-PCR-based analysis and Western blotting. Studies using double immunostaining and immunoelectron microscopy revealed that the antigen was strongly expressed in the membrane of the astrocytic foot processes of glia limitans and astrocytes with radial cytoplasm, but not distributed in neurons. In neurological disorders, hypertrophic astrocytes with strong expression of glial fibrillary acidic protein exhibited significantly decreased expression of S1PR1 in contrast to its strong expression in astrocytes forming fibrillary gliosis. These results indicate that S1PR1 is localized in astrocytes, and its expression level may change during the processes that occur after brain damage.lld:pubmed
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pubmed-article:20566754pubmed:authorpubmed-author:HamazakiShuji...lld:pubmed
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pubmed-article:20566754pubmed:authorpubmed-author:NishimuraHiro...lld:pubmed
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pubmed-article:20566754pubmed:dateRevised2011-9-13lld:pubmed
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pubmed-article:20566754pubmed:articleTitleCellular localization of sphingosine-1-phosphate receptor 1 expression in the human central nervous system.lld:pubmed
pubmed-article:20566754pubmed:affiliationDepartment of Pathology, Kawasaki Medical School, Kurashiki, Okayama, Japan. piko@med.kawasaki-m.ac.jplld:pubmed
pubmed-article:20566754pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:20566754pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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