関連する実験動画
Updated: Jun 28, 2025

08:55
Characterization of MLKL-mediated Plasma Membrane Rupture in Necroptosis
Published on: August 7, 2018
10.8K
NINJ1は膜ディスクを切断して放出することで,プラズマ膜の破裂を媒介する
Liron David1, Jazlyn P Borges2, L Robert Hollingsworth1
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, USA; Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA, USA.
Cell
|April 13, 2024
まとめ
膜タンパク質NINJ1は,細胞死亡時に血膜の破裂を引き起こすリング状の構造を形成する. ガスダーミンの毛穴とは異なり,NINJ1は膜ディスクを形成し,細胞の断片化につながります.
科学分野:
- 細胞生物学
- 構造生物学
- 生物化学
背景:
- NINJ1 (NINJA1) は,ピロプトーシスのようなリチ性細胞死経路におけるプラズマ膜破裂の主要な媒介である.
- NINJ1のメカニズムの理解は 細胞死プロセスを解読するのに不可欠です
研究 の 目的:
- NINJ1による膜破裂の 構造的根拠を決定する
- NINJ1 オリゴメリゼーションと膜相互作用のメカニズムを解明する.
主な方法:
- NINJ1オリゴメアの構造を決定するための冷凍電子顕微鏡 (冷凍EM)
- 生体細胞と超高解像度のイメージングで NINJ1の動作を視覚化します
- 放出されたNINJ1構造の組成を分析するための脂質染色.
主要な成果:
- NINJ1はアンフィパシーとトランスメブランヘリクを持つ鎖オリゴーマーを形成している.
- NINJ1オリゴーマーには,膜の相互作用と円盤形成を示唆する,明確な水性および水性面がある.
- 活細胞画像は,リンゴ状のNINJ1構造をプラズマ膜から放出し,脂質二層を取り囲んでいる.
結論:
- NINJ1はガス皮膚の毛穴とは異なる膜ディスクを形成し,プラズマ膜の破裂と断片化につながります.
- 構造的な洞察は,溶解性細胞死におけるNINJ1の役割のメカニズム的理解を提供します.
関連する概念動画
Enlargement of the Plasma Membrane
1.9K
Cell division and enlargement are processes that require precise control. The control ensures that cell division cannot proceed unless the cell has grown to a specific size. A spherical, dividing cell requires an approximately 1.6X increase in its surface area to double its volume. The secretory pathway also has a significant role in cell membrane enlargement. Secretory vesicles that bud off from the Golgi apparatus and later fuse with the plasma membrane during exocytosis are a major source of...
1.9K
Necrosis
4.5K
Necrosis is considered as an “accidental” or unexpected form of cell death that ends in cell lysis. The first noticeable mention of “necrosis” was in 1859 when Rudolf Virchow used this term to describe advanced tissue breakdown in his compilation titled “Cell Pathology”.
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become...
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become...
4.5K
Pinching-off of Coated Vesicles
3.1K
Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
3.1K
SNAREs and Membrane Fusion
10.9K
Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
10.9K
The Extrinsic Apoptotic Pathway
6.3K
The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
6.3K
Cell Motility through Blebbing
1.9K
Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...
Blebbing Through the Matrix
In multicellular...
1.9K

