A gene expression signature of emphysematous lung destruction and its reversal by the tripeptide GHK
Open accessAbstract
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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GHK shifts gene expression in COPD lungs from destruction to healthy remodeling.
“and shift gene expression in COPD lungs from destruction to healthy remodeling.”
From Modulation of Gene Expression in Human Breast Cancer MCF7 and Prostate Cancer PC3 Cells by the Human Copper-Binding Peptide GHK-Cu (2021) · cites this paper as [3]
Campbell et al. demonstrated that GHK produced favorable changes in gene expression in COPD lung tissues.
“In 2012, Campbell et al. identified a gene expression signature characteristic for COPD (Chronic Obstructive Lung Disease) and demonstrated that GHK produced favorable changes in gene expression in COPD lung tissues.”
From Modulation of Gene Expression in Human Breast Cancer MCF7 and Prostate Cancer PC3 Cells by the Human Copper-Binding Peptide GHK-Cu (2021) · cites this paper as [3]
GHK, added to fibroblasts derived from COPD lung tissue, helped restore organization of the actin cytoskeleton, elevated the expression of integrin β1, collagen I contraction and remodeling by fibroblasts.
“They also conducted laboratory experiments, confirming that GHK, added to fibroblasts derived from COPD lung tissue, helped restore organization of the actin cytoskeleton, elevated the expression of integrin β1, collagen I contraction and remodeling by fibroblasts [3].”
From Modulation of Gene Expression in Human Breast Cancer MCF7 and Prostate Cancer PC3 Cells by the Human Copper-Binding Peptide GHK-Cu (2021) · cites this paper as [3]
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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)
- ORCID
- 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
- gold
- doi.org
- 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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