title: Macrophage-secreted Exosomes Delivering miRNA-21 Inhibitor can Regulate BGC-823 Cell Proliferation.
abstract: Exosomes, membranous nanovesicles, naturally carry bio-macromolecules or miRNA and play impoetant roles in tumor pathogenesis. Here, we showed that macrophages cell-derived exosomes can function as vehicles to deliver exogenous miR-21 inhibitor into BGC-823 gastric cancer cells. Exosomes loaded with miR-21 inhibitor significantly increased miR-21 levels in BGC-823, but miR-21 inhibitor loaded in exosomes exerted an opposite effect. miRNA transfected with exosomes had less cellular toxicity to host cells compared to conventional transfection methods. The miR-21 inhibitor loaded exosomes promoted the migration ability and reduced apoptosis of BGC-823 gastric cancer cells. These observations indicate that miR-21 acts as a tumor promoter by targeting the PDCD4 gene and preventing apoptosis of gastric cancer cells through inhibition of PDCD4 expression. Furthermore, exosome -mediated miR-21 inhibitor delivery resulted in functionally more efficient inhibition and less cellular toxicity compared to conventional transfection methods. Similar approaches could be useful in modification of target biomolecules in vitro and in vivo. These findings contribute to our understanding of the functions of miR-21 and exosomes as a carrier for therapy of gastric cancer.
authors.affiliation: Department of Clinical Laboratory, Kunshan First People's Hospital, Affiliated to JiangSu University, Kunshan, China E-mail : lgxin34147@126.com.
authors.forename: Jian-Jun
authors.initials: JJ
authors.lastname: Wang
authors.forename: Ze-You
authors.initials: ZY
authors.lastname: Wang
authors.forename: Rui
authors.initials: R
authors.lastname: Chen
authors.forename: Jing
authors.initials: J
authors.lastname: Xiong
authors.forename: Yong-Liang
authors.initials: YL
authors.lastname: Yao
authors.forename: Jian-Hong
authors.initials: JH
authors.lastname: Wu
authors.forename: Guang-Xin
authors.initials: GX
authors.lastname: Li
mesh_terms: D017209:Apoptosis / Q000187:drug effects / Q000235:genetics; D051017:Apoptosis Regulatory Proteins / Q000235:genetics / Q000378:metabolism; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000187:drug effects / Q000235:genetics; D049109:Cell Proliferation / Q000187:drug effects*; D004337:Drug Carriers; D055354:Exosomes; D015870:Gene Expression; D006801:Humans; D007948:Leukemia, Monocytic, Acute / Q000235:genetics / Q000378:metabolism*; D008264:Macrophages / Q000378:metabolism; D035683:MicroRNAs / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism*; D034741:RNA, Small Interfering; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D013274:Stomach Neoplasms / Q000235:genetics / Q000378:metabolism*
chemical_list: D051017:Apoptosis Regulatory Proteins; D004337:Drug Carriers; C524940:MIRN21 microRNA, human; D035683:MicroRNAs; C114487:PDCD4 protein, human; D034741:RNA, Small Interfering; D016601:RNA-Binding Proteins