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Xia H, Bodempudi V, Benyumov A, Hergert P, Tank D, Herrera J, Braziunas J, Larsson O, Parker M, Rossi D, Smith K, Peterson M, Limper A, Jessurun J, Connett J, Ingbar D, Phan S, Bitterman PB, Henke CA. Identification of a cell-of-origin for fibroblasts comprising the fibrotic reticulum in idiopathic pulmonary fibrosis. THE AMERICAN JOURNAL OF PATHOLOGY 2014; 184:1369-83. [PMID: 24631025 PMCID: PMC4005984 DOI: 10.1016/j.ajpath.2014.01.012] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Revised: 12/26/2013] [Accepted: 01/02/2014] [Indexed: 01/08/2023]
Abstract
Idiopathic pulmonary fibrosis (IPF) is a progressive disease of the middle aged and elderly with a prevalence of one million persons worldwide. The fibrosis spreads from affected alveoli into contiguous alveoli, creating a reticular network that leads to death by asphyxiation. Lung fibroblasts from patients with IPF have phenotypic hallmarks, distinguishing them from their normal counterparts: pathologically activated Akt signaling axis, increased collagen and α-smooth muscle actin expression, distinct gene expression profile, and ability to form fibrotic lesions in model organisms. Despite the centrality of these fibroblasts in disease pathogenesis, their origin remains uncertain. Here, we report the identification of cells in the lungs of patients with IPF with the properties of mesenchymal progenitors. In contrast to progenitors isolated from nonfibrotic lungs, IPF mesenchymal progenitor cells produce daughter cells manifesting the full spectrum of IPF hallmarks, including the ability to form fibrotic lesions in zebrafish embryos and mouse lungs, and a transcriptional profile reflecting these properties. Morphological analysis of IPF lung tissue revealed that mesenchymal progenitor cells and cells with the characteristics of their progeny comprised the fibrotic reticulum. These data establish that the lungs of patients with IPF contain pathological mesenchymal progenitor cells that are cells of origin for fibrosis-mediating fibroblasts. These fibrogenic mesenchymal progenitors and their progeny represent an unexplored target for novel therapies to interdict fibrosis.
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Affiliation(s)
- Hong Xia
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota
| | - Vidya Bodempudi
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota
| | - Alexey Benyumov
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota
| | - Polla Hergert
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota
| | - Damien Tank
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota
| | - Jeremy Herrera
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota
| | - Jeff Braziunas
- Department of Pharmacology, University of Minnesota, Minneapolis, Minnesota
| | - Ola Larsson
- Department of Oncology and Pathology, Karolinska Institute, Stockholm, Sweden
| | - Matthew Parker
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota
| | - Daniel Rossi
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota
| | - Karen Smith
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota
| | - Mark Peterson
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota
| | - Andrew Limper
- Department of Medicine, Mayo Clinic College of Medicine, Rochester, Minnesota
| | - Jose Jessurun
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota
| | - John Connett
- Division of Biostatistics School of Public Health, University of Minnesota, Minneapolis, Minnesota
| | - David Ingbar
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota
| | - Sem Phan
- Department of Pathology, University of Michigan Medical School, Ann Arbor, Michigan
| | - Peter B Bitterman
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota
| | - Craig A Henke
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota.
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