24小时热门版块排行榜    

查看: 220  |  回复: 0

HYZ221314

至尊木虫 (职业作家)

优秀版主

[交流] Cancer Research :研究确认恶性生殖细胞肿瘤分子开关

最近,英国剑桥大学研究人员称,一种名为LIN28的蛋白在恶性生殖细胞肿瘤的形成过程中起着重要作用,是促发癌症的关键“开关”。这一发现对于开发新的恶性生殖细胞肿瘤治疗方法具有重要意义。

恶性生殖细胞肿瘤是一种各个年龄段男女都可能罹患的癌症,如睾丸癌、卵巢癌皆属于此列。虽然目前的化疗疗法可在一定程度上治疗该类疾病,但化疗产生的副作用也很严重,会损害患者的听力,造成肾脏、肺叶以及骨髓损伤。

在该项研究中,剑桥大学研究人员发现,所有的恶性生殖细胞肿瘤中都含有大量的LIN28蛋白,该种蛋白增多会降低let-7调节分子的水平;而反过来,let-7调节分子水平降低,也会增加细胞中多种促癌蛋白的含量,其中就包括LIN28蛋白。研究人员称,这是一个恶性循环,在这个过程中,LIN28蛋白起着关键作用,是这一循环的“开关”,它影响着癌细胞的多种属性。

研究人员还发现,通过降低细胞内LIN28蛋白含量,或者直接增加let-7分子水平,是可以逆转这种恶性循环的。这两种方法都可以降低促癌蛋白的水平,抑制癌细胞生长。

研究人员指出,新发现的LIN28蛋白的“开关”效应存在于所有的恶性生殖细胞肿瘤之中,因而这种蛋白将是一个十分重要的治疗标靶,据此开发的新疗法可有效减少化疗的毒性效应,提高患者的生存几率。

相关研究成果刊发在最新一期《癌症研究》杂志上。



Cancer Research                 doi: 10.1158/0008-5472.CAN-12-2085

LIN28 Expression in Malignant Germ Cell Tumors Downregulates let-7 and Increases Oncogene Levels

Matthew J. Murray1,2, Harpreet K. Saini4, Charlotte A. Siegler1, Jennifer E. Hanning1, Emily M. Barker1, Stijn van Dongen4, Dawn M. Ward1, Katie L. Raby1, Ian J. Groves1, Cinzia G. Scarpini1, Mark R. Pett1, Claire M. Thornton5, Anton J. Enright4, James C. Nicholson2, and Nicholas Coleman1,3; on behalf of the CCLG

Despite their clinicopathologic heterogeneity, malignant germ cell tumors (GCT) share molecular abnormalities that are likely to be functionally important. In this study, we investigated the potential significance of downregulation of the let-7 family of tumor suppressor microRNAs in malignant GCTs. Microarray results from pediatric and adult samples (n = 45) showed that LIN28, the negative regulator of let-7 biogenesis, was abundant in malignant GCTs, regardless of patient age, tumor site, or histologic subtype. Indeed, a strong negative correlation existed between LIN28 and let-7 levels in specimens with matched datasets. Low let-7 levels were biologically significant, as the sequence complementary to the 2 to 7 nt common let-7 seed “GAGGUA” was enriched in the 3′ untranslated regions of mRNAs upregulated in pediatric and adult malignant GCTs, compared with normal gonads (a mixture of germ cells and somatic cells). We identified 27 mRNA targets of let-7 that were upregulated in malignant GCT cells, confirming significant negative correlations with let-7 levels. Among 16 mRNAs examined in a largely independent set of specimens by quantitative reverse transcription PCR, we defined negative-associations with let-7e levels for six oncogenes, including MYCN, AURKB, CCNF, RRM2, MKI67, and C12orf5 (when including normal control tissues). Importantly, LIN28 depletion in malignant GCT cells restored let-7 levels and repressed all of these oncogenic let-7 mRNA targets, with LIN28 levels correlating with cell proliferation and MYCN levels. Conversely, ectopic expression of let-7e was sufficient to reduce proliferation and downregulate MYCN, AURKB, and LIN28, the latter via a double-negative feedback loop. We conclude that the LIN28/let-7 pathway has a critical pathobiologic role in malignant GCTs and therefore offers a promising target for therapeutic intervention. Cancer Res;[ Last edited by HYZ221314 on 2013-12-24 at 09:52 ]
回复此楼

» 本帖附件资源列表

» 猜你喜欢

» 本主题相关商家推荐: (我也要在这里推广)

青山不断,绿水长流
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 HYZ221314 的主题更新
普通表情 高级回复 (可上传附件)
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考研] 279分求调剂 一志愿211 +15 chaojifeixia 2026-03-19 17/850 2026-03-23 18:30 by allen-yin
[考研] 一志愿重庆大学085700资源与环境,总分308求调剂 +6 墨墨漠 2026-03-23 7/350 2026-03-23 16:09 by 墨墨漠
[考研] 291求调剂 +5 孅華 2026-03-22 5/250 2026-03-23 09:20 by haoshis
[考研] 317求调剂 +12 申子申申 2026-03-19 18/900 2026-03-22 22:23 by luoyongfeng
[考研] 一志愿武理材料工程348求调剂 +5  ̄^ ̄゜汗 2026-03-19 7/350 2026-03-22 19:44 by 公瑾逍遥
[考研] 一志愿东华大学控制学硕320求调剂 +3 Grand777 2026-03-21 3/150 2026-03-21 19:23 by 简之-
[考研] 材料与化工(0856)304求B区调剂 +3 邱gl 2026-03-20 7/350 2026-03-21 19:05 by 15709483992
[考研] 0703化学调剂 +4 妮妮ninicgb 2026-03-21 4/200 2026-03-21 18:39 by 学员8dgXkO
[考研] 265求调剂 +12 梁梁校校 2026-03-19 14/700 2026-03-21 13:38 by lature00
[考研] 一志愿山大07化学 332分 四六级已过 本科山东双非 求调剂! +3 不想理你 2026-03-16 3/150 2026-03-21 03:59 by JourneyLucky
[考研] 265求调剂 +9 梁梁校校 2026-03-17 9/450 2026-03-21 02:17 by JourneyLucky
[考研] 304求调剂 +6 曼殊2266 2026-03-18 6/300 2026-03-21 00:32 by JourneyLucky
[考研] 304求调剂 +7 司空. 2026-03-18 7/350 2026-03-20 23:08 by JourneyLucky
[考研] 一志愿 西北大学 ,070300化学学硕,总分287,双非一本,求调剂。 +4 晨昏线与星海 2026-03-19 4/200 2026-03-20 22:15 by JourneyLucky
[考研] 中南大学化学学硕337求调剂 +3 niko- 2026-03-19 6/300 2026-03-20 21:58 by luoyongfeng
[考研] 材料学硕318求调剂 +5 February_Feb 2026-03-19 5/250 2026-03-19 23:51 by 23Postgrad
[考研] 288求调剂,一志愿华南理工大学071005 +5 ioodiiij 2026-03-17 5/250 2026-03-19 18:22 by zcl123
[考研] 0703化学调剂 +4 18889395102 2026-03-18 4/200 2026-03-19 16:13 by 30660438
[考研] 085600材料与化工求调剂 +6 绪幸与子 2026-03-17 6/300 2026-03-19 13:27 by houyaoxu
[考研] 本科郑州大学物理学院,一志愿华科070200学硕,346求调剂 +4 我不是一根葱 2026-03-18 4/200 2026-03-19 09:11 by 浮云166
信息提示
请填处理意见