Video Experimental Relacionado
Updated: Sep 19, 2025

08:55
Characterization of MLKL-mediated Plasma Membrane Rupture in Necroptosis
Published on: August 7, 2018
11.0K
NINJ1 regula la fragilidad de la membrana plasmática bajo tensión mecánica
Yunfeng Zhu1,2, Fang Xiao1, Yiling Wang3
1Department of Critical Care Medicine, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
Nature
|June 9, 2025
Resumen
Los científicos descubrieron NINJ1, una proteína crucial para regular la ruptura de la membrana plasmática causada por fuerzas mecánicas. NINJ1 y NINJ2
Área de la Ciencia:
- Biología celular
- La biofísica
- Biología de las membranas
Sus antecedentes:
- La integridad de la membrana plasmática es esencial para la función celular.
- Las fuerzas mecánicas pueden dañar la membrana plasmática.
- Se desconoce en gran medida el papel de moléculas específicas en la regulación del daño de la membrana inducido por la tensión mecánica.
Objetivo del estudio:
- Identificar las proteínas que regulan la integridad de la membrana plasmática bajo tensión mecánica.
- Investigar el papel de NINJ1 en la ruptura de la membrana plasmática inducida por tensión mecánica (PMR).
Principales métodos:
- Desarrollo de un sistema de estiramiento celular de 384 pozos para la aplicación precisa de tensiones.
- Cribado de alto rendimiento de 10.843 pequeños ARN interferentes (siRNA) dirigidos a 2.726 proteínas transmembrana multipasa.
- Análisis de los cambios de permeabilidad de la membrana inducidos por la tensión.
Principales resultados:
- NINJ1 fue identificado como un golpe superior que regula la permeabilidad de la membrana inducida por la tensión.
- NINJ1 es un regulador crítico de la ruptura de la membrana plasmática inducida por tensión mecánica (PMR) independientemente de las vías de muerte celular.
- Los niveles de NINJ1 se correlacionan inversamente con la fuerza requerida para la ruptura de la membrana.
- NINJ1 por sí solo es insuficiente para la ruptura completa de la membrana en la piroptosis; se necesita fuerza adicional.
Conclusiones:
- NINJ1 es un determinante clave de las propiedades biomecánicas de la membrana plasmática.
- La expresión de NINJ1 y las fuerzas externas ajustan la PMR en diferentes microambientes mecánicos.
Más Videos Relacionados
Videos de Conceptos Relacionados
Cell-matrix's Response to Mechanical Forces
2.8K
In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue.
Anchoring junctions mechanically attach a cell to the...
Anchoring junctions mechanically attach a cell to the...
2.8K
Enlargement of the Plasma Membrane
2.0K
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...
2.0K
Regulation of Nuclear Protein Sorting
2.4K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
2.4K
Regulation of the Unfolded Protein Response
2.6K
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
2.6K
Mechanisms of Membrane-bending
2.9K
The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
2.9K
Membrane Fluidity
157.6K
Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
157.6K

