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Functions for the cAMP/Epac/Rap1 Signaling Pathway in Low-Dose Endothelial Monocyte-Activating Polypeptide-II-Induced Opening of Blood-Tumor Barrier. | LitMetric
Previous studies have demonstrated that low-dose endothelial monocyte-activating polypeptide-II (EMAP-II) induces blood-tumor barrier (BTB) hyperpermeability via both paracellular and transcellular pathways. In a recent study, we revealed that cAMP/PKA-dependent and cAMP/PKA-independent signaling pathways are both involved in EMAP-II-induced BTB hyperpermeability. The present study further investigated the exact mechanisms through which the cAMP/PKA-independent signaling pathway affects EMAP-II-induced BTB hyperpermeability. In an in vitro BTB model, low-dose EMAP-II (0.05 nM) induced a significant decrease in Rap1 activity in RBMECs. Pretreatment with forskolin to elevate intracellular cAMP concentration completely blocked EMAP-II-induced Rap1 inactivation. Epac/Rap1 activation by 8-pCPT-2'-O-Me-cAMP significantly prevented EMAP-II-induced activation of RhoA/ROCK. Furthermore, 8-pCPT-2'-O-Me-cAMP pretreatment significantly inhibited EMAP-II-induced decreases in TEER and increases in HRP flux. Pretreatment also significantly prevented EMAP-II-induced changes in MLC phosphorylation, actin cytoskeleton arrangement, and expression and distribution of ZO-1 in RBMECs. This study demonstrates that the cAMP/Epac/Rap1 signaling cascade is a crucial pathway in EMAP-II-induced BTB hyperpermeability.
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