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Histone deacetylase (HDAC) inhibitors repress interleukin-2 (IL-2) gene expression in T cells and possess immunosuppressive activity in vivo. In addition to its immunosuppressive activity, HDAC inhibitors block GATA binding protein-1 (GATA-1) gene expression in megakaryocytes and elicit thrombocytopenia. In this report we state that for a given immunosuppressive dose of HDAC inhibitor, the ratio of GATA-1 reporter gene activity relative to IL-2 reporter gene assay (G/I ratio of measured IC(50)) can be predictive of a HDAC inhibitor's thrombocytopenic effect. This study utilized nine HDAC inhibitors at a minimal effective dose in a rat heterotopic cardiac transplantation model and the resultant G/I ratios and platelet depletion rates were highly correlated (r=0.933). These results indicate that calculation of G/I ratio can be a novel method for selecting immunosuppressive HDAC inhibitor having minimal thrombocytopenic effect which will benefit the search for new immunosuppressants of greater safety and efficacy.

Novel Method for Selecting Immunosuppressive Histone Deacetylase (HDAC) Inhibitors with Minimal Thrombocytopenia