In vivo delivery of siRNA to immune cells by conjugation to a TLR9 agonist enhances antitumor immune responses.

In vivo delivery of siRNA to immune cells by conjugation to a TLR9 agonist enhances antitumor immune responses.
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DOI:
10.1038/nbt.1564
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发表时间:
2009-10
影响因子:
46.9
通讯作者:
Yu, Hua
Yu, Hua
中科院分区:
工程技术1区
文献类型:
--
作者:
Kortylewski, Marcin;Swiderski, Piotr;Herrmann, Andreas;Wang, Lin;Kowolik, Claudia;Kujawski, Maciej;Lee, Heehyoung;Scuto, Anna;Liu, Yong;Yang, Chunmei;Deng, Jiehui;Soifer, Harris S.;Raubitschek, Andrew;Forman, Stephen;Rossi, John J.;Pardoll, Drew M.;Jove, Richard;Yu, Hua

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Efficient delivery of siRNA to specific cell populations in vivo remains a formidable challenge to its successful therapeutic application. We describe a novel siRNA-based approach – synthetically linking siRNA to an oligonucleotide TLR9 agonist – that targets and silences genes in TLR9+ myeloid cells and B cells, both of which are key components of the tumor microenvironment. Because Stat3 in tumor-associated immune cells suppresses antitumor immune responses and hinders TLR9-induced immune stimulation, we tested CpG-Stat3siRNA conjugates for anti-tumor effects. When injected locally at the tumor site or systemically through an intravenous route, the CpG-Stat3siRNA conjugates access tumor-associated dendritic cells, macrophages and B cells, inhibit Stat3 expression, leading to activation of tumor-associated immune cells, and ultimately potent anti-tumor immune responses. Our findings demonstrate the potential of TLR agonist-siRNA conjugates for targeted gene silencing coupled with TLR stimulation and immune activation in the tumor microenvironment.
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