Abstract
Adeno-associated virus’ (AAV) relatively simple structure makes it accommodating for engineering into controllable delivery platforms. Cancer, such as pancreatic ductal adenocarcinoma (PDAC), are often characterized by upregulation of membrane-bound proteins, such as MMP-14, that propagate survival integrin signaling. In order to target tumors, we have engineered an MMP-14 protease-activatable AAV vector that responds to both membrane-bound and extracellularly active MMPs. This “provector” was generated by inserting a tetra-aspartic acid inactivating motif flanked by the MMP-14 cleavage sequence IPESLRAG into the capsid subunits. The MMP-14 provector shows lower background transduction than previously developed provectors, leading to a 9.5-fold increase in transduction ability. In a murine model of PDAC, the MMP-14 provector shows increased delivery to an allograft tumor. This proof-of-concept study illustrates the possibilities of membrane-bound protease-activatable gene therapies to target tumors.
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Acknowledgements
We acknowledge University of North Carolina at Chapel Hill Gene Therapy Center Core for providing us with pXX6-80 and scAAV2-CMV-GFP, the University of Pennsylvania Vector Core for providing us with pAAV2/9, and the University of Iowa Vector Core for providing us with ITR-CMV-mCherry.
Funding
NIH (R01CA207497) to JS, NCI MD Anderson/Rice Cancer T32 Fellowship 5T32CA196561-05 to SB, and NIH (R01CA220236 and R01CA218403) to A.M.
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JS is an employee of Biogen as of August, 2019. AM receives royalties for a pancreatic cancer biomarker test from Cosmos Wisdom Biotechnology, and this financial relationship is managed and monitored by the UTMDACC Conflict of Interest Committee. AM is also listed as an inventor on a patent that has been licensed by Johns Hopkins University to ThriveEarlier Detection.
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Butler, S.S., Date, K., Okumura, T. et al. Membrane-bound MMP-14 protease-activatable adeno-associated viral vectors for gene delivery to pancreatic tumors. Gene Ther 29, 138–146 (2022). https://doi.org/10.1038/s41434-021-00255-9
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DOI: https://doi.org/10.1038/s41434-021-00255-9