MHCクラスIにおけるIRGQ媒介によるオートファギーは,腫瘍の免疫回避を促進する

Lina Herhaus¹, Uxía Gestal-Mato¹, Vinay V Eapen²

¹Institute of Biochemistry II, Goethe University Frankfurt, Medical Faculty, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany.

Cell

|October 31, 2024

まとめ

免疫に関連したGTPase Qタンパク質 (IRGQ) の標的は,分解のためにMHCクラスIを誤折りたたむ. IRGQの減少は,抗腫瘍免疫を高め,肝細胞癌の生存率を向上させます.

科学分野:

細胞生物学
免疫学
癌研究

背景:

オートファジー・ライソソーム系は細胞の成分を分解し,腫瘍の進行に影響を与えます.
メジャー・ヒストコンパティビリティ・コンプレックスクラスI (MHCクラスI) の分子は,免疫監視に不可欠です.
免疫に関連するGTPaseファミリーQタンパク質 (IRGQ) の細胞品質制御における役割は不明でした.

研究の目的:

細胞品質管理における IRGQ の機能を調査する.
MHCクラスIの分子の調節におけるIRGQの役割を決定する.
ガンにおけるIRGQの治療の可能性を調査する.

主な方法:

GABARAPL2 と LC3B との相互作用を調査した.
IRGQ欠乏細胞におけるMHCクラスIの取引と分解を分析した.
肝細胞がんモデルにおける腫瘍免疫と患者の生存に対するIRGQ濃度の影響を評価した.

主要な成果:

IRGQは,誤ったMHCクラスI分子のリソソーム分解を媒介する.
IRGQの欠如は,MHCクラスIの自由重鎖の蓄積と細胞表面輸送につながる.
肝細胞がんにおけるIRGQ濃度の低下は,CD8+ T細胞応答の改善と生存率の改善と相関する.

結論:

IRGQは,MHCクラスIの品質管理の重要な規制者として機能します.
IRGQは腫瘍の免疫回避に重要な役割を果たします.
IRGQをターゲットにすることは,抗がん免疫を強化するための潜在的な戦略です.

キーワード:

GABARAPL2 について IRGQ LC3B について MHCクラスI オートファジー肝細胞がん免疫回避品質管理について

さらに関連する動画

07:36

Tumor Transplantation for Assessing the Dynamics of Tumor-Infiltrating CD8+ T Cells in Mice

Published on: June 12, 2021

6.4K

09:59

Quantitative Analysis of Autophagy using Advanced 3D Fluorescence Microscopy

Published on: May 3, 2013

17.8K

関連する概念動画

01:15

Receptor Downregulation in MVBs

2.0K

Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...

2.0K

01:27

Autophagy

4.2K

Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...

4.2K

01:31

Antigen Processing Pathways

940

MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...

940

03:03

mTOR Signaling and Cancer Progression

3.7K

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...

3.7K

01:26

Antigens Involved in Adaptive Immunity

460

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and...

460

01:36

Delivery Pathways to the Lysosome

6.2K

Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...