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Inflammation Promotes Aging-Associated Oncogenesis in the Lung
Catherine Pham-Danis1, Shi B Chia1, Hannah A Scarborough1
1Department of Biochemistry and Molecular Genetics University of Colorado Anschutz Medical Campus Aurora Colorado USA.
Aging and Cancer
|May 14, 2025
Summary
Aging lungs show increased inflammation and tumor growth. Reducing inflammation with alpha-1 antitrypsin (AAT) or NLRP3 knockout may decrease lung cancer risk in older individuals.
Area of Science:
- Oncology
- Immunology
- Gerontology
Background:
- Lung cancer is a leading cause of cancer death globally, with old age being a significant risk factor.
- Aging-associated chronic inflammation, or inflammaging, is implicated in increased lung cancer incidence, though the precise mechanisms are unclear.
Purpose of the Study:
- To investigate the relationship between age-related lung changes and lung cancer risk.
- To elucidate the role of inflammaging in lung oncogenesis.
Main Methods:
- Analysis of gene expression databases (GTEx, TCGA) comparing normal and cancerous human lung tissues across age groups.
- Utilized mouse models to assess inflammation-dependent changes and their impact on lung cancer development.
- Investigated the effects of alpha-1 antitrypsin (AAT) and NLRP3 knockout on aging-associated inflammation and tumor growth.
Main Results:
- Upregulated inflammatory pathways (e.g., TNFA signaling, interferon-gamma response) were identified in aging human and mouse lungs.
- Old mice exhibited increased tumor outgrowth in an orthotopic lung cancer model.
- NLRP3 knockout in old mice significantly reduced tumor volumes, indicating inflammation's contribution to cancer development.
Conclusions:
- Aging lungs display increased inflammation and immune deregulation, contributing to higher lung cancer risk.
- Interventions targeting inflammation, such as AAT or NLRP3 inhibition, show potential in mitigating age-related lung cancer development.
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