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Nanoscale structural alteration of lung collagen in response to strain and bleomycin injury

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Title: Nanoscale structural alteration of lung collagen in response to strain and bleomycin injury
Authors: Deyhle Jr, Richard, Krüger, Robin, Fardin, Luca, Mahmutovic Persson, Irma, Cercos-Pita, Jose Luis, Perchiazzi, Gaetano, Menzel, Andreas, Bech, Martin, Olsson, Lars E, Bayat, Sam
Contributors: Lund University, Faculty of Medicine, Department of Translational Medicine, Medical Radiation Physics, Malmö, Lunds universitet, Medicinska fakulteten, Institutionen för translationell medicin, Medicinsk strålningsfysik, Malmö, Originator, Lund University, Faculty of Science, Medical Radiation Physics, Lund, X-ray Phase Contrast, Lunds universitet, Naturvetenskapliga fakulteten, Medicinsk strålningsfysik, Lund, X-ray Phase Contrast, Originator, Lund University, Faculty of Medicine, Lund University Bioimaging Center, Lunds universitet, Medicinska fakulteten, Lund University Bioimaging Center, Originator, Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: Photon Science and Technology, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Avancerade ljuskällor, Originator, Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: Engineering Health, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Teknik för hälsa, Originator, Lund University, Profile areas and other strong research environments, Lund University Profile areas, LU Profile Area: Light and Materials, Lunds universitet, Profilområden och andra starka forskningsmiljöer, Lunds universitets profilområden, LU profilområde: Ljus och material, Originator, Lund University, Profile areas and other strong research environments, Other Strong Research Environments, LUCC: Lund University Cancer Centre, Lunds universitet, Profilområden och andra starka forskningsmiljöer, Övriga starka forskningsmiljöer, LUCC: Lunds universitets cancercentrum, Originator
Source: Scientific Reports. 15:1-16
Subject Terms: Medical and Health Sciences, Clinical Medicine, Cardiology and Cardiovascular Disease, Medicin och hälsovetenskap, Klinisk medicin, Kardiologi och kardiovaskulära sjukdomar, Radiology and Medical Imaging, Radiologi och bildbehandling
Description: The link between the structural organization of the fibrillar components of lung extracellular matrix (ECM), local tissue stiffness and global viscoelastic behaviour is not known. Here we investigated the effect of injurious mechanical ventilation on the local lung tissue stiffness using 4D synchrotron phase-contrast micro-CT, in normal lung and 7 days after intratracheal bleomycin induced lung injury in anesthetized rats. Quantitative maps of local lung strain (ε) were computed within aerated lung acini, using a stepwise image registration method. Fibrillar organization of collagen and elastin at the nanoscale was measured using synchrotron small-angle x-ray scattering (SAXS). Local microscopic tissue ε was reduced in the aerated acini of normal lungs post injurious ventilation and in bleomycin-injured lungs and was associated with an increase in dynamic elastance (H). The scattering peak angle (q) which is inversely related to fibril D-spacing, was decreased by injurious ventilation indicating an elongationof the collagen fibril spacing in both normal and bleomycin-injured lung. There was a positive relationship between collagen periodicity and global tissue elastance, while an inverse relation was observed with tissue hysteresis. Our data demonstrate the effect of both bleomycin-induced lung injury and high-strain mechanical ventilation on the nanoscale fibrillar organization of collagen and for the first time, a link between collagen D-spacing and global lung tissue stiffening and viscoelastic behaviour.
Access URL: https://doi.org/10.1038/s41598-025-07218-9
Database: SwePub
Description
Abstract:The link between the structural organization of the fibrillar components of lung extracellular matrix (ECM), local tissue stiffness and global viscoelastic behaviour is not known. Here we investigated the effect of injurious mechanical ventilation on the local lung tissue stiffness using 4D synchrotron phase-contrast micro-CT, in normal lung and 7 days after intratracheal bleomycin induced lung injury in anesthetized rats. Quantitative maps of local lung strain (ε) were computed within aerated lung acini, using a stepwise image registration method. Fibrillar organization of collagen and elastin at the nanoscale was measured using synchrotron small-angle x-ray scattering (SAXS). Local microscopic tissue ε was reduced in the aerated acini of normal lungs post injurious ventilation and in bleomycin-injured lungs and was associated with an increase in dynamic elastance (H). The scattering peak angle (q) which is inversely related to fibril D-spacing, was decreased by injurious ventilation indicating an elongationof the collagen fibril spacing in both normal and bleomycin-injured lung. There was a positive relationship between collagen periodicity and global tissue elastance, while an inverse relation was observed with tissue hysteresis. Our data demonstrate the effect of both bleomycin-induced lung injury and high-strain mechanical ventilation on the nanoscale fibrillar organization of collagen and for the first time, a link between collagen D-spacing and global lung tissue stiffening and viscoelastic behaviour.
ISSN:20452322
DOI:10.1038/s41598-025-07218-9