Langerhans cells facilitate epithelial DNA damage and squamous cell carcinoma.

Langerhans cells facilitate epithelial DNA damage and squamous cell carcinoma.
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Langerhans细胞促进上皮DNA损伤和鳞状细胞癌。

DOI:
10.1126/science.1211600
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发表时间:
2012-01-06
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Girardi M
Girardi M
中科院分区:
其他
文献类型:
--
作者:
Modi BG;Neustadter J;Binda E;Lewis J;Filler RB;Roberts SJ;Kwong BY;Reddy S;Overton JD;Galan A;Tigelaar R;Cai L;Fu P;Shlomchik M;Kaplan DH;Hayday A;Girardi M

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多环芳烃(PAHs)是一种广泛存在的强致癌物质,而7,12-二甲基苯并[a]菲(DMBA)是一种被广泛应用于肿瘤发生研究的模型多环芳烃。缺乏表皮树突状细胞(DC)的朗格汉斯细胞(LCS)的小鼠不受皮肤化学致癌的保护,不依赖T细胞免疫。对其潜在机制的研究表明,LC缺陷皮肤对DMBA诱导的DNA损伤具有相对的抵抗力。LCS有效地将DMBA代谢成DMBA-反式-3,4-二醇,DMBA-反式-3,4-二醇是致癌HRAS突变的中间近端,DMBA处理的LC缺陷皮肤包含的HRAS突变显著减少。此外,DMBA-反式-3,4-二醇的应用绕过了LC缺陷小鼠的肿瘤耐药性。此外,DMBA对人角质形成细胞的遗传毒性影响通过预先与人来源的LC孵育而显著增加。因此,组织相关树突状细胞可通过多环芳烃代谢促进化学致癌,突出免疫细胞与致癌的复杂关系。
Polyaromatic hydrocarbons (PAHs) are prevalent, potent carcinogens, and 7,12-dimethylbenz[a]anthracene (DMBA) is a model PAH widely used to study tumorigenesis. Mice lacking Langerhans cells (LCs), a signatory epidermal dendritic cell (DC), are protected from cutaneous chemical carcinogenesis, independent of T cell immunity. Investigation of the underlying mechanism revealed that LC-deficient skin was relatively resistant to DMBA-induced DNA damage. LCs efficiently metabolized DMBA to DMBA-trans-3,4-diol, an intermediate proximal to oncogenic Hras mutation, and DMBA-treated LC-deficient skin contained significantly fewer Hras mutations. Moreover, DMBA-trans-3,4-diol application bypassed tumor resistance in LC-deficient mice. Additionally, the genotoxic impact of DMBA on human keratinocytes was significantly increased by prior incubation with human-derived LC. Thus, tissue-associated DC can enhance chemical carcinogenesis via PAH metabolism, highlighting the complex relation between immune cells and carcinogenesis.
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