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2021 Fiscal Year Final Research Report

The suppression of macrophage-mediated xenogeneic rejection by human TIGIT and PQA-18

Research Project

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Project/Area Number 19K09092
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 55010:General surgery and pediatric surgery-related
Research InstitutionOsaka University

Principal Investigator

Maeda Akira  大阪大学, 医学系研究科, 招へい教員 (00319708)

Project Period (FY) 2019-04-01 – 2022-03-31
Keywords異種移植 / マクロファージ / PQA-18 / TIGIT / 自然免疫 / MDSC
Outline of Final Research Achievements

In this study, the suppressive effect of a novel immunosuppression, PQA-18, and human TIGIT on porcine cells was investigated. Both PQA-18 and human TIGIT on porcine cells significantly suppressed macrophage-mediated cytotoxicity. Furthermore,to study the mechanism of the suppression by TIGIT, the phosphorylation of SHP-1 was assessed using a western blotting analysis.Our study revealed that human TIGIT induced a significant phosphorylation of SHP-1 in macrophages.These findings indicate that PQA-18 and human TIGIT are effective measures against xenogeneic rejection.

Free Research Field

異種移植

Academic Significance and Societal Importance of the Research Achievements

ブタの臓器や細胞を用いた異種移植は今後移植におけるドナー不足を解決するために非常に重要な課題である。今回の研究でPQA-18という新たな免疫抑制剤とヒトTIGITの遺伝子導入が異種移植拒絶反応の抑制に有効であることが分かった。つまりヒトTIGIT分子を発現するブタを作り出すことが異種臓器・細胞の生着率の改善につながることを意味している。また従来の免疫抑制剤に加えてPQA-18を使用することによってブタ細胞および臓器の生着のさらなる改善が見込める。

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Published: 2023-01-30  

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