関連する実験動画
Updated: Mar 12, 2026

07:04
Identifying PD-1/PD-L1 Inhibitors with Surface Plasmon Resonance Technology
Published on: May 2, 2025
1.3K
骨髄細胞におけるPI3Kγを標的としたチェックポイント阻害療法に対する抵抗の克服
Olivier De Henau1, Matthew Rausch2, David Winkler2
1Memorial Sloan Kettering Cancer Center, Parker Institute for Cancer Immunotherapy and Swim Across America/Ludwig Collaborative Laboratory, New York, New York 10065, USA.
Nature
|November 10, 2016
まとめ
PI3Kγ阻害剤で骨髄細胞を標的にすると,がんの免疫療法に対する抵抗を克服できます. このアプローチは腫瘍の免疫マイクロ環境を再構成し,免疫チェックポイントを阻害する抗体に対する感受性を回復させます.
科学分野:
- 腫瘍学
- 免疫学
- 薬理学について
背景:
- 免疫チェックポイント阻害抗体 (ICB) を含む免疫療法は,免疫系を抑制することでがん治療に有望である.
- しかし,ICBに対する抵抗は重要な課題であり,しばしば腫瘍の微小環境内の免疫抑制性骨髄細胞によって媒介されます.
- これらの骨髄細胞の高浸透は予後が悪いことと,ICB治療に対する反応の低下と相関しています.
研究 の 目的:
- 臨床前がんモデルにおけるICBに対する抵抗を媒介する骨髄細胞の役割を調査する.
- 骨髄細胞の重要な酵素であるフォスホイノシチド3キナーゼ・ガンマ (PI3Kγ) を標的とし,ICB抵抗を克服する効果を評価する.
- 精密がん治療のための新しい組み合わせ戦略を探求する.
主な方法:
- 腫瘍免疫とICB耐性を研究するために,臨床前のマウスモデルシステムを利用した.
- 様々な腫瘍に浸透する 骨髄細胞の抑制活動を調査した.
- 選択的なPI3Kγ阻害剤 (現在,臨床試験の第1段階であるNCT02637531) を投与し,腫瘍の免疫微環境とICBの感受性への影響を評価した.
主要な成果:
- 臨床前モデルでは,抑制性骨髄細胞活動が直接ICBに対する抵抗を媒介することを確認した.
- PI3Kγの選択的薬理学的ターゲティングがICBに対する感受性を回復することを示した.
- PI3Kγの阻害は腫瘍の免疫微環境を再構成し,直接がん細胞を標的とせず,細胞毒性T細胞媒介の腫瘍回帰を促進することを示した.
結論:
- 免疫抑制性髄膜浸透が高いのがんにおいて,PI3Kγを髄膜細胞に標的化することは,ICB耐性を克服する有効な戦略である.
- IPI-549のような選択的PI3Kγ阻害剤は,がん免疫療法の有効性を高めるための新しい組み合わせ治療の機会を提供します.
- この研究は 腫瘍の免疫環境に合わせた 精密医療のアプローチを 支持しています
関連する概念動画
PI3K/mTOR/AKT Signaling Pathway
6.1K
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a...
6.1K
Targeted Cancer Therapies
9.1K
The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
There are several types of targeted therapies against...
There are several types of targeted therapies against...
9.1K
Inhibition of Cdk Activity
6.1K
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
6.1K
Tumor Immunotherapy
2.1K
Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
2.1K
Combination Therapies and Personalized Medicine
6.3K
Combining two or more treatment methods increases the life span of cancer patients while reducing damage to vital organs or tissue from the overuse of a single treatment. Combination therapy also targets different cancer-inducing pathways, thus reducing the chances of developing resistance to treatment.
The combination of the drug acetazolamide and sulforaphane is a good example of combination therapy to treat cancer. The cells in the interior of a large tumor often die due to the hypoxic and...
The combination of the drug acetazolamide and sulforaphane is a good example of combination therapy to treat cancer. The cells in the interior of a large tumor often die due to the hypoxic and...
6.3K

