相关实验视频

Updated: Jun 10, 2025

Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States

Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States

Published on: April 1, 2015

纤维素αC区域作为功能安全锁:对纤维素生物机械行为模型的含义

Tímea Feller¹, Helen R McPherson², Simon D Connell³

¹Discovery and Translational Science Department, Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, UK; Molecular and Nanoscale Physics Group, School of Physics, University of Leeds, UK.

Acta biomaterialia

|October 11, 2024

概括

纤维素αC区域不是纤维素纤维的主要承载结构. 相反,原纤维骨干在纤维素中起着至关重要的作用.

科学领域:

生物化学生物化学
生物物理学的生物物理.
材料科学材料科学材料科学

背景情况:

纤维素形成了血块的支架,并具有独特的生物力学特性,如伸展性和应变硬性.
有助于这些特性的特定亚纤维结构,特别是在纤维素αC区域内,仍然在很大程度上是未知的.

研究的目的:

研究纤维素αC区域的切断如何影响单个纤维素纤维的生物力学特性.
阐明纤维素应变硬化和伸展性的结构基础.

主要方法:

利用了纤维素αC区域中缺失的工程蛋白质.
在单个纤维素纤维上进行机械测试,以评估模量,伸展性,破裂应力和应变硬化.
分析了压力放松行为.

主要成果:

缺少αC区域并没有影响低应变模量,但降低了伸展性,导致过早破裂.
应变硬化甚至在没有αC区域的情况下也持续存在,这表明它不仅仅依赖于这个区域.
αC区域在高应变时起到安全锁的作用,而原纤维骨干对于承载负载至关重要.

结论:

原纤维骨干,而不是αC区域,是纤维素纤维的主要承载结构.
一个基于原纤维细胞分支的修订结构模型解释了纤维素独特的生物机械行为.
αC区域通过作为安全机制来调节机械性能,特别是在高应变时.

关键词:

生物机械模型模型血液凝固血液凝固纤维素原蛋白是一种纤维素.聚合物生物学聚合物生物学

更多相关视频

Observing and Quantifying Fibroblast-mediated Fibrin Gel Compaction

Observing and Quantifying Fibroblast-mediated Fibrin Gel Compaction

Published on: January 16, 2014

Analysis of β-Amyloid-induced Abnormalities on Fibrin Clot Structure by Spectroscopy and Scanning Electron Microscopy

Analysis of β-Amyloid-induced Abnormalities on Fibrin Clot Structure by Spectroscopy and Scanning Electron Microscopy

Published on: November 30, 2018

相关概念视频

Intracellular Signaling Affects Focal Adhesions

Intracellular Signaling Affects Focal Adhesions

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...

Clot Retraction and Fibrinolysis

Clot Retraction and Fibrinolysis

After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.

Cell-matrix's Response to Mechanical Forces

Cell-matrix's Response to Mechanical Forces

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...

Amyloid Fibrils

Amyloid Fibrils

Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...