Journal
CANCER LETTERS
Volume 509, Issue -, Pages 26-38Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.canlet.2021.03.027
Keywords
Endostatin; IL-24; MSC; Conditionally replicating adenovirus; Tet-on system
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Funding
- Fundamental Research Funds for the Central Universities [GK201704009]
- National Natural Science Foundation of China [81773265]
- Key Research and Development Plan of Shaanxi Province [2018SF106]
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Utilizing MSCs as potential carriers and regulating adenovirus replication with a Tet-on system has shown effective treatment against glioma. The novel adenovirus demonstrated efficient replication and killing of glioma cells in vitro, with effective regulation by doxycycline. The doxycycline-induced group with dual expression of IL24 and Endostatin showed significantly greater antitumor effects in a xenograft model of glioma.
Oncolytic adenovirus-mediated gene therapy shows promise for cancer treatment; however, the systemic delivery of oncolytic adenovirus to tumors remains challenging. Recently, mesenchymal stem cells (MSCs) have emerged as potential vehicles for improving delivery. Yet, because the oncolytic adenovirus replicates in MSCs, balancing MSC viability with viral load is key to achieving optimal therapeutic effect. We thus developed an allin-one Tet-on system that can regulate replication of oncolytic adenovirus. Then, we loaded the novel oncolytic adenovirus carrying interleukin (IL)-24 and/or Endostatin in human umbilical cord blood-mesenchymal stem cells (hUCB-MSCs) for glioma therapy. In vitro assays demonstrated that this novel oncolytic adenovirus could efficiently replicate and kill glioma cells while sparing normal cells. Moreover, doxycycline effectively regulated oncolytic adenovirus replication in the hUCB-MSCs. The doxycycline induction group with dual expression of IL24 and Endostatin exhibited significantly greater antitumor effects than other groups in a xenograft model of glioma. Thus, this strategy for systemic delivery of oncolytic adenovirus with its oncolytic activity controlled by a Tet-on system is a promising method for achieving antitumor efficacy in glioma, especially for metastatic tumors.
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