2018 Fiscal Year Final Research Report
Investigation of safer methods of therapeutic miRNA and exosomes
| Project/Area Number |
16K09610
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Kidney internal medicine
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| Research Institution | Nagoya University |
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Principal Investigator |
Kato Noritoshi 名古屋大学, 医学部附属病院, 病院助教 (90716052)
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| Co-Investigator(Kenkyū-buntansha) |
丸山 彰一 名古屋大学, 医学系研究科, 教授 (10362253)
小杉 智規 名古屋大学, 医学系研究科, 講師 (90584681)
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| Research Collaborator |
Nishio Fumitoshi
Funahashi Yoshio
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | miRNA / Toll like receptor |
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| Outline of Final Research Achievements |
We investigated the pathophysiological role of exogenously applied microRNA (miRNA) in sepsis-induced multiple organ injury. In vitro, we tested possible miRNAs which suppressed the production of pro-inflammatory cytokines. Of these, miR-146a displayed the highest suppressive effect. Sepsis was induced in mice via cecal ligation and puncture (CLP) and an intravenous injection of a complex of miR-146a-expressing plasmid and polyethyleneimine. Treatment with this complex significantly decreased the level of serum inflammatory cytokines, attenuated organ injury, and led to increased survival from sepsis. miR-146a-expressing plasmid was abundantly distributed in splenic macrophages. CLP mice treated with miR-146a displayed significantly decreased NF-κB activation in the spleen. The collective results support the conclusion that the induction of miR-146a expression in splenic macrophages prevents excessive inflammation and sepsis-induced multiple organ injury.
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| Free Research Field |
miRNA
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| Academic Significance and Societal Importance of the Research Achievements |
敗血症は全死亡率が高い重篤な疾患であるが、抗菌治療や、補液などに治療的なエビデンスがあるものの、新たな治療法の開発は遅れ、生存率の改善は停滞している。我々はToll like receptorシグナルをmiRNAによって制御するといった、全く新しいアプローチで治療を行った。
結果から全身投与したmiRNA発現ベクターは、主に脾臓マクロファージに取り込まれ、過剰なサイトカイン産生を抑制し、生存率の改善に寄与していた。これは今後の核酸医薬の開発にとって、投与核酸の体内動態、作用を探る上でも意義深い。また、miRNAは低分子医薬や抗体医薬と比べ安価に作成できるため、将来の治療応用にも期待が持てる。
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