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Enhanced inflammation and attenuated tumor suppressor pathways are associated with oncogene-induced lung tumors in aged mice.
Parikh, Neha; Shuck, Ryan L; Gagea, Mihai; Shen, Lanlan; Donehower, Lawrence A.
Afiliação
  • Parikh N; Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX, 77030, USA.
  • Shuck RL; Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX, 77030, USA.
  • Gagea M; Department of Veterinary Medicine and Surgery, UT MD Anderson Cancer Center, Houston, TX, 77030, USA.
  • Shen L; Children's Nutrition Research Center, Houston, TX, 77030, USA.
  • Donehower LA; Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX, 77030, USA.
Aging Cell ; 17(1)2018 02.
Article em En | MEDLINE | ID: mdl-29047229
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-1ß, 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.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Envelhecimento / Transformação Celular Neoplásica / Proliferação de Células / Inflamação / Neoplasias Pulmonares Idioma: En Ano de publicação: 2018 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Envelhecimento / Transformação Celular Neoplásica / Proliferação de Células / Inflamação / Neoplasias Pulmonares Idioma: En Ano de publicação: 2018 Tipo de documento: Article