Abstract：
:Gene therapy with Plasmid AMEP (antiangiogenic metargidin peptide) has recently been studied as a potential targeted therapy for melanoma. This plasmid is designed to downregulate α5β1 and αvβ3 integrins. In our study, electroporation was used as a nonviral delivery system. We investigated the antiangiogenic and direct antitumor effectiveness of this gene therapy on low and highly metastatic B16 melanoma variants. In vitro, the antiangiogenic effectiveness as determined by tube formation assay on endothelial cells was predominantly dependent on AMEP expression levels. In vivo, antitumor effectiveness was mediated by the inhibition of proliferation, migration and invasion of melanoma cells and correlated with the expression of integrins on tumor cells after intratumor delivery. In addition, reduced metastatic potential was shown. Intramuscular gene electrotransfer of Plasmid AMEP, for AMEP systemic distribution, had no antitumor effect with this specific preventive treatment protocol, confirming that direct tumor delivery was more effective. This study confirms our previous in vitro data that the expression levels of integrins on melanoma cells could be used as a biomarker for antitumor effectiveness in integrin-targeted therapies, whereas the expression levels of AMEP peptide could be a predictive factor for antiangiogenic effectiveness of Plasmid AMEP in the treatment of melanoma.
journal_name
Gene Therjournal_title
Gene therapyauthors
Bosnjak M,Dolinsek T,Cemazar M,Kranjc S,Blagus T,Markelc B,Stimac M,Zavrsnik J,Kamensek U,Heller L,Bouquet C,Turk B,Sersa Gdoi
10.1038/gt.2015.26subject
Has Abstractpub_date
2015-07-01 00:00:00pages
578-90issue
7eissn
0969-7128issn
1476-5462pii
gt201526journal_volume
22pub_type
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