https://blog.superhyydl.org/tags/erk1/2/Recent content in ERK1/2 on Superhyydl's BlogHugozh-cnSun, 06 Sep 2026 00:00:00 +0000https://blog.superhyydl.org/reading/elevated-fn14-expression-promotes-proliferation/Sun, 06 Sep 2026 00:00:00 +0000https://blog.superhyydl.org/reading/elevated-fn14-expression-promotes-proliferation/<h2 id="一句话亮点">一句话亮点</h2> <p>这篇《Cancer Letters》研究发现，FN14在横纹肌肉瘤（RMS）中高表达，不依赖其配体TWEAK，而是通过激活ERK1/2信号、增强线粒体氧化磷酸化来驱动肿瘤增殖和化疗耐药；反过来，敲低FN14或抑制ERK1/2能把耐药细胞&quot;拽&quot;回分化轨道。对于耐药/持久细胞（DTP）来说，FN14-ERK1/2-线粒体代谢轴可能是它们&quot;休眠-复苏&quot;的一个代谢开关。</p> <h2 id="背景痛点">背景/痛点</h2> <p>横纹肌肉瘤是儿童最常见的软组织肉瘤，治疗上棘手之处有两点：第一，约1/3患者最终对标准化疗（主要是长春新碱）产生耐药；第二，这种肿瘤细胞明明表达成肌调控因子，却&quot;赖&quot;在细胞周期里不肯退出，无法完成终末分化。这两个问题背后的分子机制一直没完全说清楚。</p> <p>FN14这个受体之前多被关注在组织修复和肌肉再生中——作者的课题组已经报道过Fn14调控肌肉卫星细胞的融合和自我更新。但在肿瘤里，FN14在多个癌种中高表达且与预后不良相关，唯独在RMS里没人碰过。更关键的是，FN14究竟是通过配体TWEAK激活，还是单纯靠过表达&quot;自激活&quot;下游信号，在不同肿瘤里结论不一。</p> <p>@方法论点评：这篇文章一上来就选了一个&quot;机制模糊但临床关联明确&quot;的切入点——FN14在别的癌种有线索，但在RMS是空白；作者用&quot;已知的未知&quot;来论证研究的必要性，比&quot;我随便筛了个分子&quot;更有说服力。</p> <h2 id="推理链分步拆解">推理链分步拆解</h2> <h3 id="第一步先看fn14在rms里到底有没有异常表达">第一步：先看FN14在RMS里到底有没有异常表达</h3> <p>作者首先分析了公共RNA-seq数据（GSE108022），发现FN14的mRNA在融合阳性和融合阴性的RMS样本里都比正常肌肉高出一大截，但配体TWEAK基本没变化。接着在RD（胚胎型）和RH30（腺泡型）两个细胞系里验证了蛋白水平，确认FN14高表达。TCGA泛癌分析显示FN14高表达的患者总生存更差。</p> <p><a href="https://example.com/placeholder.png">https://example.com/placeholder.png</a></p> <p><img alt="Fig. 1：Expression of FN14 in RMS cell lines and tumor samples. (A) Relative mRNA levels of TWEAK and FN14 obtained from analysis of RNA-Seq dataset (GSE108022) containing 5 normal human muscles, 28 FP-RMS and 51 FN-RMS samples. p &lt; 0.05, values significantly different from normal muscle samples by unpaired Student t test. (B) Representative immunoblots, and (C) densitometry analysis showing levels of FN14 and unrelated protein GAPDH in human myoblasts (HM) and RD and RH30 cell lines. n = 3 biological replicates in each group. Data presented as mean ± SD. p&lt;0.05, values significantly different from human muscle by unpaired Student t test. (D) TCGA data analysis of Pan-Cancer samples shows worse overall survival for patients having tumors with high FN14 expression. A median cut-off point was used for the analysis (High, n=4277 and low, n=4238)." loading="lazy" src="https://blog.superhyydl.org/images/reading/elevated-fn14-expression-promotes-proliferation/figure-01.png"></p>