期刊
CANCER RESEARCH
卷 66, 期 15, 页码 7395-7400出版社
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/0008-5472.CAN-06-0558
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- NCI NIH HHS [R01 CA 67529, R01 CA 108854, P01 CA 26731] Funding Source: Medline
- NCRR NIH HHS [T32 RR 07036] Funding Source: Medline
- NIAID NIH HHS [R01 AI 52267-01] Funding Source: Medline
- NIDDK NIH HHS [R01 DK 52413] Funding Source: Medline
- NIEHS NIH HHS [P30 ES002109, P30 ES 02109] Funding Source: Medline
Inflammation associated with bacterial infections is a risk factor for cancers in humans, yet its role in breast cancer remains poorly understood. We have previously shown that innate immune inflammatory response against intestinal bacteria is sufficient to induce colon cancer. Here we report that infecting Rag2-deficient C57BL/6 Ape(Min/+) mice with an intestinal bacterial pathogen, Helicobacter hepaticus, significantly promotes mammary carcinoma in females and enhances intestinal adenoma multiplicity by a tumor necrosis factor alpha (TNF alpha)-dependent mechanism. The mammary and intestinal tumor development as well as the increase in proinflammatory mediators is suppressed by adoptive transfer of interleukin 10-competent CD4(+)CD45RB(10)CD25(+) regulatory (TR) cells. Furthermore, prior exposure of donor mice to H. hepaticus significantly enhances antitumor potency of their T-R cells. Interestingly, these microbially experienced TR cells suppress tumorigenesis more effectively in recipient mice irrespective of their tumor etiology. These data suggest that infections with enteric pathogens enhance T-R-Cell potency and protect against epithelial cancers later in life, potentially explaining paradoxical increases in cancer risk in developed countries having more stringent hygiene practices. The possibility that dysregulated gut microbial infections in humans may lead to cancer in anatomically distant organs, such as breast, highlights the need for novel immune-based strategies in cancer prevention and treatment.
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