"TNF plays an inhibitory role in modulating myocardial SDF-1 production and blockade of TNF signaling by ablation of TNFR1 and TNFR2 genes increased SDF-1 expression in the heart. These data expand on TNF signaling-initiated mechanisms in myocardium which may lend a more complete understanding of SDF-1 and TNFR-derived actions in hopes of advancing ischemic heart injury treatments."xsd:string