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南京医科大学青年基金结题,CysLTR1如何驱动胃癌进展

  • 2026-04-10 03:49:07
南京医科大学青年基金结题,CysLTR1如何驱动胃癌进展

导读

国家自然科学基金结题报告

化疗耐药是癌症治疗中的巨大挑战。一项起初旨在破解结肠癌5-Fu耐药密码的国家自然科学基金项目,在执行中因前沿竞争,果断转向,最终在另一个战场——胃癌中,取得了突破性发现。研究首次系统揭示了半胱氨酸白三烯受体1(CysLTR1)在胃癌中的关键作用:它不仅高表达于胃癌组织、预示不良预后,更能直接促进肿瘤细胞的增殖、侵袭,并抑制其凋亡。本文将带您深入了解这个“改道”研究的始末与重要科学发现。

研 究 背 景 

胃癌是全球范围内高发病率与死亡率的恶性肿瘤,其治疗手段有限,患者预后不佳,亟需新的治疗靶点和预后生物标志物。半胱氨酸白三烯受体1(CysLTR1)是炎症介质白三烯D4(LTD4)的特异性受体,以往研究多关注其在哮喘等炎症疾病中的作用。近年来,其在结直肠癌等肿瘤中的促癌作用逐渐被揭示。

本研究原计划深入探索CysLTR1通过“偏向性核转运”调控结肠癌对一线化疗药物5-氟尿嘧啶(5-Fu)耐药的机制。然而,在项目执行期间(2021-2023年),瑞典、法国及中国多个团队相继发表了关于CysLTR1在结直肠癌中表达、功能及耐药调控的高水平论文,使得原研究方向的创新性受到严峻挑战。经慎重评估并获基金委批准,课题组于2023年初将研究方向战略性调整至探索CysLTR1在胃癌中的作用与机制,这一转变旨在填补该领域的研究空白。

内 容 简 介

1. CysLTR1是胃癌潜在的预后生物标志物

研究首先在临床组织水平展开。免疫组化结果显示,CysLTR1在胃癌组织中存在差异性高表达。进一步的生存分析证实,CysLTR1高表达的胃癌患者,其总生存期显著短于低表达患者。这表明,CysLTR1的表达水平与胃癌不良预后密切相关,具备成为预后评估新型分子标志物的潜力。

2. CysLTR1促进胃癌恶性生物学行为

为了明确CysLTR1的功能,研究团队在MKN28和HGC-27等胃癌细胞系中进行了功能缺失实验。研究发现,敲低CysLTR1表达后,胃癌细胞的增殖能力(EdU实验证实)和侵袭转移能力(Transwell实验证实)均受到显著抑制。同时,流式细胞术检测显示,敲低CysLTR1可显著促进胃癌细胞凋亡。这些体外实验一致表明,CysLTR1像是一个“加速器”,能够驱动胃癌细胞的生长、扩散并帮助其抵抗死亡。

3. 体内实验再次验证CysLTR1的促癌作用

体外结论在动物模型中得到有力印证。通过构建小鼠种植瘤模型,研究人员发现,与对照组相比,敲低CysLTR1的胃癌细胞在体内形成的肿瘤体积和重量均明显减小。这从活体水平证实,靶向抑制CysLTR1能够有效遏制胃癌的生长,为其作为治疗靶点提供了临床前依据。

4. 机制探索:JNK信号通路可能是关键

研究进一步探索了CysLTR1发挥作用的分子机制。蛋白质印迹(WB)实验结果显示,敲低CysLTR1后,c-Jun氨基末端激酶(JNK1/2)的磷酸化水平下降,同时细胞凋亡相关蛋白的表达上调,上皮-间质转化(EMT)及侵袭相关蛋白的表达受到抑制。这提示,CysLTR1很可能通过激活JNK信号通路,进而调控下游与细胞增殖、凋亡、侵袭相关的一系列分子,最终促进胃癌进展。

5. 构建基于CysLTR1的胃癌预后预测模型

利用生物信息学方法,课题组对癌症基因组图谱(TCGA)中的胃癌队列(STAD)进行了深入分析。他们筛选出与CysLTR1密切相关的25个关键基因,并以此构建了一个预后预测模型。该模型能够将胃癌患者划分为高风险组和低风险组,两组间的生存率存在显著差异。模型在预测1年、3年和5年生存率的受试者工作特征曲线下面积(AUC)分别达到0.637、0.742和0.768,显示出良好的预测效能。此外,结合临床信息构建的列线图(Nomogram)和决策曲线分析(DCA)进一步证实了该模型的临床应用价值。

6. 研究调整的说明与未来方向

报告也坦诚说明了研究方向调整的缘由,即因结直肠癌领域相关研究已密集发表,为追求创新而转向胃癌研究。同时,报告指出,关于CysLTR1在胃癌化疗耐药(特别是5-Fu)中的具体作用,因构建稳定耐药细胞系遇到技术挑战,仍在持续探索中,这将是团队未来的重点研究方向之一。

结 论 

本项研究成功实现了从“结肠癌耐药”到“胃癌机制”的战略转向,并取得了一系列原创性发现:

首次系统揭示:CysLTR1在胃癌中高表达,是提示不良预后的独立风险因子。

功能明确:CysLTR1能显著促进胃癌细胞增殖、侵袭,并抑制细胞凋亡,其体内促癌作用也得到了验证。

机制初探:CysLTR1的促癌作用可能与激活JNK信号通路有关。

临床价值:基于CysLTR1相关基因构建的预后模型具有良好的预测性能,为胃癌患者的个性化预后评估提供了新工具。

这项研究不仅拓展了人们对CysLTR1在肿瘤中作用的认识,将关注点从结直肠癌引向胃癌,也为胃癌的预后判断和靶向治疗提供了新的潜在靶点(CysLTR1本身及其下游JNK通路)。未来,针对CysLTR1的抑制剂或联合疗法,有望成为攻克胃癌的新策略。

展示仅供学习使用!

本文中使用的图片来国家自然科学基金结题报告,因客观原因未能与权利人取得联系。本平台出于学术交流目的引用,无意侵犯原作者权益。如权利人认为不妥,请及时联系公众号后台,我们将立即删除或协商解决。

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  1. CONNECT:[ UseTime:0.000463s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000703s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000290s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000260s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000654s ]
  6. SELECT * FROM `set` [ RunTime:0.000265s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000701s ]
  8. SELECT * FROM `article` WHERE `id` = 525521 LIMIT 1 [ RunTime:0.001847s ]
  9. UPDATE `article` SET `lasttime` = 1775986139 WHERE `id` = 525521 [ RunTime:0.000823s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000241s ]
  11. SELECT * FROM `article` WHERE `id` < 525521 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002593s ]
  12. SELECT * FROM `article` WHERE `id` > 525521 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001207s ]
  13. SELECT * FROM `article` WHERE `id` < 525521 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001852s ]
  14. SELECT * FROM `article` WHERE `id` < 525521 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005511s ]
  15. SELECT * FROM `article` WHERE `id` < 525521 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004205s ]
0.092343s