Enhanced inflammation and attenuated tumor suppressor pathways are associated with oncogene‐induced lung tumors in aged mice
Year: 2017
Type: article
Abstract: Summary Aging is often accompanied by a dramatic increase in cancer susceptibility. To gain insights into how aging affects tumor susceptibility, we generated a conditional mouse model in which oncogenic KrasG12D was activated specifically in lungs of young (3–5 months) and old (19–24 months) mice. Activation of KrasG12D in old mice resulted in shorter survival and development of higher‐grade lung tumors. Six weeks after KrasG12D activation, old lung tissues contained higher numbers of adenomas than their young tissue counterparts. Lung tumors in old mice displayed higher proliferation rates, as well as attenuated DNA damage and p53 tumor suppressor responses. Gene expression comparison of lung tumors from young and old mice revealed upregulation of extracellular matrix‐related genes in young tumors, indicative of a robust cancer‐associated fibroblast response. In old tumors, numerous inflammation‐related genes such as Ccl7, IL‐1β, Cxcr6, and IL‐15ra were consistently upregulated. Increased numbers of immune cells were localized around the periphery of lung adenomas from old mice. Our experiments indicate that more aggressive lung tumor formation in older KrasG12D mice may be in part the result of subdued tumor suppressor and DNA damage responses, an enhanced inflammatory milieu, and a more accommodating tissue microenvironment.
Source: Aging Cell
DOI: 10.1111/acel.12691
Language: English
Subfield: Aging
Domain: Life Sciences
Open Access status: gold
Estimated APC paid: $3,790
Funders: Ellison Medical Foundation, American Federation for Aging Research, Cancer Prevention and Research Institute of Texas, Dan L. Duncan Cancer Center, Baylor College of Medicine, John S. Dunn Gulf Coast Consortium for Chemical Genomics, National Institutes of Health, University of Texas MD Anderson Cancer Center, National Institute on Aging, National Cancer Institute, National Institute of Diabetes and Digestive and Kidney Diseases, Eunice Kennedy Shriver National Institute of Child Health and Human Development
Awards: G1147702603, G2538640567, G274084553, Proteomics and Metabolomics Core Facility, The Combinatorial Drug Discovery Program (CDDP), G5136147547, The effects of Age on Cancer Signaling Pathways in Mice, G7030828501, G7557813972, G7837447426, G806902274, G8413015676, G9000013585, G9000153121, G9000240210, Baylor College of Medicine Cancer Center - Cancer Center Support Grant
OpenAlex ID: W2766400120