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2023 Fiscal Year Final Research Report

Studies on anti-tumor potential of symbiotic retroviruses and their therapeutic applications

Research Project

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Project/Area Number 20H03150
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 42020:Veterinary medical science-related
Research InstitutionKyoto University

Principal Investigator

Miyazawa Takayuki  京都大学, 医生物学研究所, 准教授 (80282705)

Co-Investigator(Kenkyū-buntansha) 中川 草  東海大学, 医学部, 准教授 (70510014)
目堅 博久  宮崎大学, 産業動物防疫リサーチセンター, 准教授 (90633264)
Project Period (FY) 2020-04-01 – 2024-03-31
KeywordsマイクロRNA / 腫瘍 / レトロウイルス / フォーミーウイルス / がん治療 / トランスクリプトーム解析 / ネコ / ウシ
Outline of Final Research Achievements

MicroRNAs (miRNAs) classified as non-coding RNAs regulate various metabolic systems and viral life cycles. To date, numerous DNA viruses, many of which are members of the herpesvirus family, and a relatively small number of RNA viruses, including retroviruses, have been reported to encode and express miRNAs in infected cells. A few retroviruses have been shown to express miRNAs, and foamy viruses (FVs) were initially predicted by computational analyses to possess miRNA-coding regions. Subsequent studies on simian and bovine FVs confirmed the presence of functional and biologically active miRNA expression cassettes. We herein identified feline FV-derived miRNAs using a small RNA deep sequencing ana-lysis. We confirmed their repressive functions on gene expression by dual-luciferase reporter assays. We found that the seed sequences of the miRNAs identified in the present study were conserved among all previously reported FFV isolates.

Free Research Field

ウイルス学

Academic Significance and Societal Importance of the Research Achievements

非病原性のウイルスであり、多くの動物に持続感染しているフォーミーウイルスは、そのゲノム中にマイクロRNA(miRNA)をコードしている。フォーミーウイルス感染細胞からは大量のmiRNAが産生されている。そのmiRNAの中には腫瘍の形成を抑えるものがあることが我々のわかった。今後、フォーミーウイルスを用いた腫瘍抑制性のベクターの開発や、フォーミーウイルスベクターを用いて大量のmiRNAを産生する株化細胞を作出し、miRNAを産生する細胞の培養上清中のエクソソームを回収・精製し、がんの治療に応用できる可能性が開けた。

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Published: 2025-01-30  

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