Problem: Aim of our study was to investigate whether TIFI, a syntetic peptide able to compete with anti-phospholipid antibodies (aPL) in the binding to endothelium, may restore aPL-inhibited endometrial angiogenesis.
Methods: The protective role of TIFI was evaluated on: i) aPL-inhibited of human endometrial endothelial cells (HEEC) angiogenesis in vitro; ii) aPL-inhibited vascular endothelial growth factor (VEGF) and metalloproteases (MMPs) expression; iii) aPL-inhibited Nuclear Factor-κB (NF-κB) and Extracellular signal-Regulated Kinase (ERK) activation and (iv) angiogenesis in vivo.
Results: TIFI restores in a dose-dependent manner: i) aPL-mediated inhibition of HEEC angiogenesis in vitro and in vivo (P < 0.05), ii) VEGF (P < 0.001) and MMP-2 (P < 0.05) expression and iii) NF-κB DNA binding and ERK-1/2 activation (P < 0.05) inhibited by aPL.
Conclusion: Our results show for the first time the protective effects of TIFI, as represented by its ability to interfere with aPL mediated anti-angiogenic activity.
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