作者:Adrian Hayday 来源:《科学》 发布时间:2011-12-6 % Q% g/ _" V8 P3 T$ o
8 y, o* c9 ~0 a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。
: I* O, x, O {1 ~ g" ?+ Q1 @3 A" k- S7 S
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。
2 l P3 z5 \6 i; |! ^; D
# [' O! h0 M) h) G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。1 D% K, l0 r" c
( w8 t8 D/ s1 S; P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)
0 H0 f- g* }4 p8 V9 W6 j: \ W" S' y1 C( Q% r4 Z& j
1 ?& B3 ~7 Z- b4 f5 J+ V9 }2 y4 p& y% r, m- M
The Intraepithelial T Cell Response to NKG2D-Ligands Links Lymphoid Stress Surveillance to Atopy # t; g+ r- h: |* n
: u# b: ?$ E, d' t. t
Science 2 December 2011: Vol. 334 no. 6060 pp. 1293-1297 DOI: 10.1126/science.1211250 ; X4 ?8 i$ K' m; p; s! ^1 l3 o% Y
% {1 M, h& r8 v- U6 X+ U' t
Abstract
) X5 w& @. U% m) U$ G2 KEpithelial 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. ) y9 x! ], C/ c3 l) [
5 ?7 S6 H9 W; S& _. f3 ?4 r
Received for publication 15 July 2011.
; n) i+ j! K) J; RAccepted for publication 13 October 2011.
$ y/ b# B& w; s8 c% u6 Khttp://www.sciencemag.org/content/334/6060/12935 v( i/ k( N) [; O$ U6 d
9 R3 Q3 u6 c& V( h! H2 W* P【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& {8 ?- ^5 p8 J8 k
|