作者:Adrian Hayday 来源:《科学》 发布时间:2011-12-6 4 |- ^2 Z/ y0 W; L2 _6 _
' C7 o# \: @: ^8 h4 h7 b1 g; B. z8 @* ~4 h过敏是让很多人烦恼的事情,但它也有好的一面。英国的一项新研究显示,过敏反应可被机体组织用来防癌,因此如果在被过敏困扰的时候想想可能患癌风险下降了,也许心情就会变好一些。
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% t/ U5 q2 K4 s# @* H英国伦敦大学国王学院等机构的研究人员在新一期美国《科学》杂志上报告说,他们观察了实验鼠上皮细胞在可能受到致癌因素伤害时的反应特征。上皮细胞是位于器官表面的细胞,它们经常面临致癌因素的威胁,比如皮肤外表的上皮细胞会受到紫外线照射的影响,而肺部上皮细胞会受到吸烟的影响。4 \* i0 A! E8 ~$ N; \1 O1 C
9 u3 G' H# p- |) S) u( O: m. ^英国科研人员通过观察发现,上皮细胞在受到这些致癌因素威胁时,会释放出一种特殊分子,这种分子会激活周围的免疫细胞,让它们摧毁某个有可能癌变的上皮细胞。但与此同时,实验鼠身体其他部位的免疫组织也都被这种分子激活了,整个免疫系统开始释放出大量抗体,这种情形与机体过敏时发生的反应相同。
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在过敏时,免疫系统的这种反应是为了清除进入体内的花粉等过敏原,而在抗癌“动机”的驱使下,免疫系统的上述反应是为了彻底清除那些由于威胁因素而产生、可能致癌的毒素,降低患癌症风险。(来源:新华社 黄堃)
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The Intraepithelial T Cell Response to NKG2D-Ligands Links Lymphoid Stress Surveillance to Atopy 1 Y' j' N( o1 d6 n
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Science 2 December 2011: Vol. 334 no. 6060 pp. 1293-1297 DOI: 10.1126/science.1211250 3 s, W& r) d2 A
3 S/ U- J+ C; i. x( K( |3 v, s6 [Abstract
4 P& {6 O# o: v" f4 s! R7 uEpithelial cells respond to physicochemical damage with up-regulation of major histocompatibility complex–like ligands that can activate the cytolytic potential of neighboring intraepithelial T cells by binding the activating receptor, NKG2D. The systemic implications of this lymphoid stress-surveillance response, however, are unknown. We found that antigens encountered at the same time as cutaneous epithelial stress induced strong primary and secondary systemic, T helper 2 (TH2)–associated atopic responses in mice. These responses required NKG2D-dependent communication between dysregulated epithelial cells and tissue-associated lymphoid cells. These data are germane to uncertainty over the afferent induction of TH2 responses and provide a molecular framework for considering atopy as an important component of the response to tissue damage and carcinogenesis.
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0 y( \4 K! o1 |2 S/ E* {7 ZReceived for publication 15 July 2011. 5 {: }6 b" ~. s5 j; M/ E
Accepted for publication 13 October 2011. 9 D( I6 \3 G& {4 L/ B7 C1 Z
http://www.sciencemag.org/content/334/6060/1293
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【扩展阅读】研究显示有接触性过敏反应的人可能不易患癌 http://www.stemcell8.cn/thread-43649-1-1.html
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