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2020 Fiscal Year Final Research Report

Improvement of efficiency and safety of solid cancer selective anticancer molecule production system using Bifidobacterium

Research Project

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Project/Area Number 18K06781
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 47060:Clinical pharmacy-related
Research InstitutionShinshu University

Principal Investigator

Taniguchi Shun'ichiro  信州大学, 医学部, 特任教授 (60117166)

Co-Investigator(Kenkyū-buntansha) 肥田 重明  名古屋市立大学, 医薬学総合研究院(薬学), 教授 (10345762)
Project Period (FY) 2018-04-01 – 2021-03-31
Keywords固形がん / 腫瘍微小環境 / 低酸素 / DDS / ビフィズス菌 / 抗腫瘍性抗体医薬 / がん分子標的薬 / がん化学療法
Outline of Final Research Achievements

In the clinical application of DDS using bifidobacterium (B), we investigated the immune response against B using macrophages and dendritic cells to create an immune safety basis. B induced the production of cytokines such as IL-6 and TNF-α, and we found the reaction was caused through TLR2. On the other hand, in killed B, cytokine production and anti-B IgG antibody production were significantly reduced. Some polysaccharides and proteins on the wall of B were identified as candidates for involvement in immune activation. An expression system for cytokines and svFc was established with B, and the combined use of anti-PD1 antibody and cytosine deaminase-producing B / 5F C was observed to suppress tumor growth and enhance the survival.

Free Research Field

DDS, がん治療、分子腫瘍学

Academic Significance and Societal Importance of the Research Achievements

がん分子標的薬は、特定がんに対し効果を示し、副作用も減少するが、薬剤耐性細胞出現が懸念材料である。また抗体医薬等の有効性は、数多く報告されているが、その薬価は高額で自己免疫疾患的な副反応が深刻な場合が報告されている。蛋白質製剤は、その製造コストが高く、高薬価となる。副作用に関しても分子標的が腫瘍非特異的で、全身投与では副反応が生じる。これらの問題点を改善するために、固形がんの低酸素微小環境に着目し、ビフィズス菌による抗体医薬の腫瘍局所での持続的発現・分泌系の樹立は、比較的安価で低副作用の医薬品を開発できる。さらに副作用の問題で開発が断念された医薬品についても、利用できる可能性がある。

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Published: 2022-01-27  

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