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When things go wrong: Exploring possible mechanisms driving the progressive fibrosis phenotype in interstitial lung diseases

Moisés Selman, Annie Pardo
European Respiratory Journal 2021; DOI: 10.1183/13993003.04507-2020
Moisés Selman
1Instituto Nacional de Enfermedades Respiratorias “Ismael Cosío Villegas”, Mexico City, Mexico
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Annie Pardo
2Facultad de Ciencias, Universidad Nacional Autónoma de Mexico, Mexico City, Mexico
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Abstract

Interstitial lung diseases (ILD) comprise a large and heterogeneous group of disorders of known and unknown etiology characterised by diffuse damage of the lung parenchyma. In the past years, it has become evident that patients with different types of ILD are at risk of developing progressive pulmonary fibrosis known as pulmonary fibrosing ILD (PF-ILD). This is a phenotype behaving similar to idiopathic pulmonary fibrosis, the archetypical example of progressive fibrosis. PF-ILD is not a distinct clinical entity but describes a group of ILD with a similar clinical behavior. This phenotype may occur in diseases displaying distinct etiologies and different biopathology during their initiation and development. Importantly, these entities may have the potential for improvement or stabilisation prior to entering in the progressive fibrosing phase. The crucial questions are (1) why a subset of patients develops a progressive and irreversible fibrotic phenotype even with appropriate treatment, and (2) what the pathogenic mechanisms driving progression possibly are. We here provide a framework highlighting putative mechanisms underlying progression, including genetic susceptibility, aging, epigenetics, the structural fibrotic distortion, the aberrant composition and stiffness of the extracellular matrix, and the emergence of distinct profibrotic cell subsets. Understanding the cellular and molecular mechanisms behind PF-ILD will provide the basis for identifying risk factors and appropriate therapeutical strategies.

Footnotes

This manuscript has recently been accepted for publication in the European Respiratory Journal. It is published here in its accepted form prior to copyediting and typesetting by our production team. After these production processes are complete and the authors have approved the resulting proofs, the article will move to the latest issue of the ERJ online. Please open or download the PDF to view this article.

Conflict of interest: Dr. Kohli has nothing to disclose.

Conflict of interest: Dr. Selman reports personal fees from Boehringer Ingelheim, outside the submitted work.

Conflict of interest: Dr. Pardo has nothing to disclose.

  • Received November 2, 2020.
  • Accepted January 27, 2021.
  • ©The authors 2021. For reproduction rights and permissions contact permissions{at}ersnet.org
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Vol 57 Issue 2 Table of Contents
European Respiratory Journal: 57 (2)
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When things go wrong: Exploring possible mechanisms driving the progressive fibrosis phenotype in interstitial lung diseases
Moisés Selman, Annie Pardo
European Respiratory Journal Jan 2021, 2004507; DOI: 10.1183/13993003.04507-2020

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When things go wrong: Exploring possible mechanisms driving the progressive fibrosis phenotype in interstitial lung diseases
Moisés Selman, Annie Pardo
European Respiratory Journal Jan 2021, 2004507; DOI: 10.1183/13993003.04507-2020
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