Cited by 7Chronic Obstructive Pulmonary Disease (COPD) ResearchInterstitial Lung Diseases and Idiopathic Pulmonary FibrosisAsthma and respiratory diseases

A gene expression signature of emphysematous lung destruction and its reversal by the tripeptide GHK

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Campbell, Joshua D, McDonough, John E, Zeskind, Julie E, Hackett, Tillie L, Pechkovsky, Dmitri V, Brandsma, Corry-Anke, Suzuki, Masaru, Gosselink, John V +12 more·2012·Genome Medicine

Abstract

Background: Chronic obstructive pulmonary disease (COPD) is a heterogeneous disease consisting of emphysema, small airway obstruction, and/or chronic bronchitis that results in significant loss of lung function over time. Methods:In order to gain insights into the molecular pathways underlying progression of emphysema and explore computational strategies for identifying COPD therapeutics, we profiled gene expression in lung tissue samples obtained from regions within the same lung with varying amounts of emphysematous destruction from smokers with COPD (8 regions × 8 lungs = 64 samples).Regional emphysema severity was quantified in each tissue sample using the mean linear intercept (Lm) between alveolar walls from micro-CT scans. Results:We identified 127 genes whose expression levels were significantly associated with regional emphysema severity while controlling for gene expression differences between individuals.Genes increasing in expression with increasing emphysematous destruction included those involved in inflammation, such as the B-cell receptor signaling pathway, while genes decreasing in expression were enriched in tissue repair processes, including the transforming growth factor beta (TGFβ) pathway, actin organization, and integrin signaling.We found concordant differential expression of these emphysema severity-associated genes in four cross-sectional studies of COPD.Using the Connectivity Map, we identified GHK as a compound that can reverse the gene-expression signature associated with emphysematous destruction and induce expression patterns consistent with TGFβ pathway activation.Treatment of human fibroblasts with GHK recapitulated TGFβ-induced gene-expression patterns, led to the organization of the actin cytoskeleton, and elevated the expression of integrin β1.Furthermore, addition of GHK or TGFβ restored collagen I contraction and remodeling by fibroblasts derived from COPD lungs compared to fibroblasts from former smokers without COPD.Conclusions: These results demonstrate that gene-expression changes associated with regional emphysema severity within an individual's lung can provide insights into emphysema pathogenesis and identify novel therapeutic opportunities for this deadly disease.They also suggest the need for additional studies to examine the mechanisms by which TGFβ and GHK each reverse the gene-expression signature of emphysematous destruction and the effects of this reversal on disease progression.

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Crossref · 10.1186/gm368

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Authors
Campbell, J. D., McDonough, J. E., Zeskind, J. E., Hackett, T. L., Pechkovsky, D. V., Brandsma, C.-A., Suzuki, M., Gosselink, J. V., Liu, G., Alekseyev, Y. O., Xiao, J., Zhang, X., Hayashi, S., Cooper, J. D., Timens, W., Postma, D. S., Knight, D. A., Lenburg, M. E., Hogg, J. C., & Spira, A.
Affiliations
  • Boston University (US)
  • University of British Columbia (CA)
  • University Medical Center Groningen (NL)
  • Hospital of the University of Pennsylvania (US)
Venue
Genome Medicine
Published
2012
Volume
4
Issue
8
Pages
67
ISSN
1756-994X (ISSN-L)
OpenAlex
W4255443313
Cited by
5
References
38
Citations by year
2024: 1 · 2018: 1 · 2016: 1 · 2015: 1 · 2012: 1
FWCI
0.52
Type
journal article
Language
en
Open access
Locations
Genome Medicine (publishedVersion)
Funders
  • National Science Foundation
  • European Respiratory Society
  • British Columbia Lung Association
  • Division of Graduate Education
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Chronic Obstructive Pulmonary Disease (COPD) Research
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Interstitial Lung Diseases and Idiopathic Pulmonary Fibrosis
  • Health Sciences › Medicine › Physiology › Asthma and respiratory diseases
Keywords
emphysema, chronic obstructive pulmonary disease, gene expression signatures, TGF-beta signaling, emphysema severity, lung fibroblasts, collagen remodeling, beta1 integrin, actin cytoskeleton, B cell receptor signaling, tissue repair, smokers, drug target identification

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