氨酸 - 氨酸链接保护核免受机械变形和信号传输
Zanetta Kechagia1, Pablo Sáez2,3, Manuel Gómez-González4
1Institute for Bioengineering of Catalonia (IBEC), Barcelona Institute of Science and Technology (BIST), Barcelona, Spain. jkechagia@ibecbarcelona.eu.
Nature materials
|September 14, 2023
概括
拉米宁保护乳腺上皮细胞核免受机械应力,阻碍它们对组织刚性的反应. 阻断整合素β4可以逆转这种效应,揭示了组织机械敏感性调节的新机制.
科学领域:
- 生物物理学的生物物理.
- 细胞生物学 细胞生物学
- 细胞外矩阵研究 细胞外矩阵研究
背景情况:
- 细胞外基质 (ECM) 通过其机械特性显著影响组织行为.
- 拉米宁是上皮组织中关键的ECM成分,提供结构支持.
- 细胞对机械线索的反应对组织发育和功能至关重要.
研究的目的:
- 研究拉米宁如何影响乳腺上皮细胞的机械反应.
- 阐明整合素β4在介导拉米因对核机械屏蔽的影响中的作用.
- 了解YAP局部化,染色体和细胞入侵的下游影响.
主要方法:
- 用不同的ECM蛋白质 (拉米宁-111,纤维素,原I) 覆盖细胞培养基.
- 评估细胞对基质刚性和YAP核定位的反应.
- 使用机械扰动和数学建模.
- 阻断胺特异性整合素β4并分析其对细胞力学和YAP信号传递的影响.
主要成果:
- 拉米宁-111涂层损害了表皮细胞对基质硬性和YAP核入口的反应,与纤维菌素或原I不同.
- 抑制整合素β4增加了核YAP水平,以一种依赖于刚性的方式,而不改变细胞力或焦点粘附.
- 集成蛋白β4在基质和质细胞骨架之间形成了机械联系,使网络变硬,并保护核免受变形.
- 这种机制影响了YAP机制反应,染色质甲基化和3D细胞入侵.
结论:
- 拉米宁通过整合素β4和质细胞骨架来屏蔽细胞核来调节表皮细胞的机械反应.
- 这一途径展示了组织如何调节它们对机械信号的敏感性.
- 这些发现提供了关于组织机制和癌细胞入侵的见解.
相关概念视频
Anchoring Junctions
3.8K
Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
3.8K
Laminins are the Adhesive Proteins of Basal Lamina
2.2K
Laminins are heterotrimeric proteins with high molecular mass found in the extracellular matrix. Each laminin molecule is composed of three chains, viz. alpha, beta, and gamma, coded by five, four, and three paralogous genes, respectively. Laminins are categories based on the compositions of the three chains.
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
2.2K
Disassembly of Intermediate Filaments
2.1K
Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
2.1K
Cell-matrix's Response to Mechanical Forces
2.7K
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...
2.7K
Basal Lamina are the Specialized Form of ECM
2.8K
The basal lamina is a thin extracellular layer that lies underneath the cells and separates them from other tissues. The three layers of the basal lamina are lamina lucida, lamina densa and lamina reticularis. The basal lamina, a mixture of glycoproteins and collagen, provides an attachment site for the epithelium, separating it from underlying connective tissue. The framework of basal lamina has other essential proteins such as laminins mesh, perlecan, entactin, and type IV collagen.
Proteins...
Proteins...
2.8K
Intracellular Signaling Affects Focal Adhesions
2.7K
Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Some...
2.7K


