{"id":231,"date":"2018-01-16T04:49:40","date_gmt":"2018-01-16T03:49:40","guid":{"rendered":"http:\/\/www.bioactivescreeninglibrary.com\/?p=231"},"modified":"2022-01-07T10:43:44","modified_gmt":"2022-01-07T02:43:44","slug":"sirt1-silencing-increased-hdac-inhibitor-induced-cell-death","status":"publish","type":"post","link":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/2018\/01\/16\/sirt1-silencing-increased-hdac-inhibitor-induced-cell-death\/","title":{"rendered":"Indeed SIRT1 silencing increased HDAC inhibitor-induced cell death"},"content":{"rendered":"

It should be noted that TLOs were induced not only in the stomach but also in other organs of AID2\/2 mice . Therefore, these organs are also considered to be potential targets for an autoimmune response. Indeed, autoimmune diseases have been found to develop in multiple organs in humans with AID mutation . The precise mechanism by which AID deficiency promotes the generation of self-reactive B cells is an open question at this moment. A previous Axitinib<\/a> report revealed that the BCR diversity is increased in AID2\/2 mice . Consequently, gastric Ag-specific B cells might emerge from the expanded B-cell repertoire. Under physiological conditions, B-cell autoimmunity is counteracted by several tolerance mechanisms including receptor editing, anergy, and clonal deletion. Particularly, as many as 50% of newly produced B cells are reported to show an anergic phenotype , suggesting the primary importance of anergy in peripheral tolerance . Although anergic B cells have a shorter lifespan relative to wild-type mature B cells , anergy is a reversible process: anergic B cells have been shown to revert to naIve B cells upon hapten stimulation . This observation raises the possibility that escape from anergy could result in autoimmunity. Mice and humans lacking functional AID display B-cell hyperplasia and a hyperactivated immune system . Based on these observations, we speculate that the aberrant activation stress may drive B-cell clones, which are normally retained in an anergic state, toward an autoimmune response. Intercrossing of AID 2\/2 mice with transgenic mice expressing a BCR prone to anergy should help clarify this speculation. Several mechanisms have been proposed to explain why AID deficiency leads to dysregulated proliferation of B cells. One possibility is that AID2\/2 B cells are devoid of inhibitory signals though FccRIIB due to the lack of IgG Ab MK-0683<\/a> production. FccRIIB is the only FccR that contains a cytoplasmic ITIM motif. Crosslinking of the BCR and FccRIIB by IgG antibody-antigen complexes leads to negative feedback regulation for B cell activation via the phosphorylation of ITIM tyrosines and subsequent recruitment of the inositol phosphatase SHIP to the plasma membrane. Therefore, FccRIIB2\/2 mice display elevated Ig levels and enhanced immune complex-mediated tissue injury in response to Ag challenge . Furthermore, involvement of this inhibitory receptor in peripheral tolerance has been supported by the fact that FccRIIB2\/2 mice on a C57BL\/6 background spontaneously develop autoantibody-mediated lupus glomerulonephritis . Although significantly different types of autoimmue diseases, namely systemic versus organ-specific, are induced in FccRIIB2\/2 and in AID2\/2 mice, respectively, this phenotypic difference is most likely due to the inability of AID2\/2 mice to produce high-affinity autoimmune IgG Abs. AID-\/- mice produce abnormally large amounts of IgM, whereas IgG is absent. IgM, like IgG, can promote complement activation, which in turn could support B-cell activation, because opsonization of Ags by complement components remarkably enhances both B cell activation as well as Ag uptake by B cells .<\/p>\n","protected":false},"excerpt":{"rendered":"

It should be noted that TLOs were induced not only in the stomach but also in other organs of AID2\/2 mice . Therefore, these organs are also considered to be potential targets for an autoimmune response. Indeed, autoimmune diseases have been found to develop in multiple organs in humans with AID mutation . The precise … Continue reading “Indeed SIRT1 silencing increased HDAC inhibitor-induced cell death”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/posts\/231"}],"collection":[{"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/comments?post=231"}],"version-history":[{"count":1,"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/posts\/231\/revisions"}],"predecessor-version":[{"id":232,"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/posts\/231\/revisions\/232"}],"wp:attachment":[{"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/media?parent=231"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/categories?post=231"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.bioactivescreeninglibrary.com\/index.php\/wp-json\/wp\/v2\/tags?post=231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}