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pubmed-article:15096185pubmed:abstractTextWe previously developed a transgenic mouse line into which a rabbit protein kinase Calpha (PKCalpha) gene fused to a human CD2 promoter/enhancer was introduced, and we found that immunosenescence was facilitated in these transgenic mice. In this study, we found that along with age-dependent increase in the level of protein expression of PKCalpha and its translocation to the membrane, activated T cells became less sensitive to apoptosis-inducing anti-Fas antibody. The capacity of T cells to express Fas antigen on their surfaces in response to anti-CD3 and interleukin-2 was impaired in PKCalpha-transgenic mice of relatively advanced age, although background Fas expression levels on T cells from those mice were high. We then found that out of proportion to a high level of cell surface Fas expression the density of cholera toxin B (CTx)-binding raft elements decreased in PKCalpha-transgenic mice of relatively advanced age and to a lesser extent in normal mice of advanced age. Correspondingly, the expression level of raft-associating Lck was decreased in these mice. These findings suggest for the first time that immunosenescence of T cells involves a decrease in density of cell surface CTx-binding raft elements, which might underlie a deterioration in T-cell signal pathway for either cell death or cell activation.lld:pubmed
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pubmed-article:15096185pubmed:authorpubmed-author:NakashimaIzum...lld:pubmed
pubmed-article:15096185pubmed:authorpubmed-author:SuzukiHaruhik...lld:pubmed
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pubmed-article:15096185pubmed:articleTitleInhibition of Fas-mediated apoptotic cell death of murine T lymphocytes in a mouse model of immunosenescence in linkage to deterioration in cell membrane raft function.lld:pubmed
pubmed-article:15096185pubmed:affiliationDepartment of Immunology, Nagoya University Graduate School of Medicine, Nagoya, Japan.lld:pubmed
pubmed-article:15096185pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:15096185pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed