Complex strain induced structural changes observed in fibrin assembled in human plasma

Nanoscale
G Portale, J Torbet

Abstract

The structure of the core scaffold of blood clots, the interlinked 3-dimensional network of fibrin fibers, is modified by mechanical forces generated by platelet driven clot retraction, wound repair and shear stress through blood flow. Here X-ray diffraction is used to investigate how uniaxial strain, ε (ε = extension/original length), alters fiber structure in highly aligned human plasma clots covalently cross-linked by Factor XIIIa. Three stretch sensitive axially repeating structures are identified. Firstly, the foundation structure with an initial ≈22 nm axial repeat stretches, fades then disappears at ε ≈ 0.40. A second, lengthened transitory structure emerges at the low strains (ε ≈ 0.20) believed to be developed by cells. Finally, a third shortened structure appears after relaxation. Simultaneously as strain progresses an increasing fraction of molecules become axially disordered. Weak off-axis diffraction maxima indicate the presence of lateral ordering up to ε = 0.40 that partially recovers after relaxation. The reappearance of both axial and lateral order on relaxation demonstrates a surprising resilience in structure. In view of the range and importance of fibrin's functions, this structural heterogeneity, triggered ...Continue Reading

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Methods Mentioned

BETA
X-ray
AFM
neutron diffraction
stretch-diffraction

Software Mentioned

matlab

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