Interleukin 6, but not T helper 2 cytokines, promotes lung carcinogenesis.
Interleukin 6, but not T helper 2 cytokines, promotes lung carcinogenesis.
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DOI：
10.1158/1940-6207.capr-10-0180
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发表时间：
2011-01
期刊：
影响因子：
--
通讯作者：
Moghaddam SJ
中科院分区：
文献类型：
--
作者：
Ochoa CE;Mirabolfathinejad SG;Ruiz VA;Evans SE;Gagea M;Evans CM;Dickey BF;Moghaddam SJ
Several epidemiologic studies have found that smokers with chronic obstructive pulmonary disease (COPD), an inflammatory disease of the lung, have an increased risk of lung cancer compared to smokers without COPD. We have shown a causal role for COPD-like airway inflammation in lung cancer promotion in the CCSPCre/LSL–K-rasG12D mouse model (CC-LR). In contrast, existing epidemiologic data do not suggest any definite association between allergic airway inflammation and lung cancer. To test this, CC-LR mice were sensitized to ovalbumin (OVA) then challenged with an OVA aerosol weekly for eight weeks. This resulted in eosinophilic lung inflammation associated with increased levels of T helper 2 cytokines and mucous metaplasia of airway epithelium, similar to what is seen in asthma patients. However, this type of inflammation did not result in a significant difference in lung surface tumor number (49 ± 9 in OVA vs 52 ± 5 in control), in contrast to a 3.2-fold increase with COPD-like inflammation. Gene expression analysis of NTHi-treated lungs showed up-regulation of a different profile of inflammatory genes, including interleukin 6 (IL-6), compared to OVA-treated lungs. Therefore, to determine the causal role of cytokines that mediate COPD-like inflammation in lung carcinogenesis, we genetically ablated IL-6 in CC-LR mice. This not only inhibited intrinsic lung cancer development (1.7-fold), but also inhibited the promoting effect of extrinsic COPD-like airway inflammation (2.6-fold). We conclude that there is a clear specificity for the nature of inflammation in lung cancer promotion, and IL-6 has an essential role in lung cancer promotion.
