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IF14.1!南京中医药大学校长程海波用 “国自然” ,拿下顶刊《AS》!

  • 2026-05-30 17:55:33
IF14.1!南京中医药大学校长程海波用 “国自然” ,拿下顶刊《AS》!
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引言

最近看到一篇有意思的研究,是南中医校长程海波团队做的,它讲的是一个叫“lobeline”的小分子化合物,居然能在结直肠癌里通过影响免疫细胞的状态来抑制肿瘤生长。文章发现它能改变肿瘤相关巨噬细胞的极化方向,促进抗肿瘤的M1型、抑制促肿瘤的M2型,而且这一过程跟它上调一个叫Slurp1的蛋白有关。

更有意思的是,lobeline还直接结合并影响了MAPK14这个靶点,进而通过p53去调控Slurp1的表达。整体看下来,这条MAPK14/p53/Slurp1信号轴可能是一个新的治疗思路,挺值得关注的。

如果你想做国自然,可以找小柒帮忙,能给你的科研之路实实在在助力一把,欢迎来试试~

literature interpretation
文献解读

标题:通过罗贝林靶向MAPK14,上调Slurp1介导的TAM替代激活抑制并延缓结直肠癌生长

发表期刊:Advanced Science

发表时间:2025年3月

影响因子:14.1/Q1

研究背景

结直肠癌因肿瘤微环境中M2型巨噬细胞主导的免疫抑制,导致免疫治疗疗效不佳。半边莲虽常用于CRC治疗,但其活性成分洛贝林的作用机制不明。本研究拟探索洛贝林是否通过调控SLURP1影响巨噬细胞极化,从而逆转免疫抑制、抑制肿瘤生长。

研究方法

动物模型:荷瘤小鼠给予洛贝林治疗,测量肿瘤生长和PCNA表达变化。

单细胞测序:分析肿瘤微环境细胞比例变化和Slurp1的表达水平。

机制验证:TRAP筛选靶点,CRISPR等功能实验验证MAPK14/p53/Slurp1通路。

research results
研究结果
01

洛贝林抑制肿瘤和类器官生长

洛贝林在活体小鼠和实验室养的“迷你肿瘤”上的效果。他们在MC38小鼠身上试了不同剂量,发现洛贝林能明显减慢肿瘤长大的速度,而且剂量越高效果越棒。PCNA蛋白也随着剂量增加而减少了。人的结直肠癌类器官实验也证实了类似的抑制效果。总的来说,洛贝林抑制结直肠癌增殖的效果还是挺稳的(图1)

图1 洛贝林可减少MC38异种移植C57BL/6小鼠和结直肠癌类器官的肿瘤负荷

复现建议:小鼠皮下接种MC38细胞,肿瘤长到100mm³时给药。洛贝林腹腔注射,试12.5、25、50mg/kg,每天一次。隔天量肿瘤大小,最后称瘤重。PCNA用免疫组化检测。类器官用不同浓度洛贝林处理,几天后评估活性。

02

单细胞测序揭示洛贝林重塑免疫微环境

单细胞测序的结果,就是想看洛贝林到底在肿瘤里动了哪些“手脚”。他们发现洛贝林组里癌细胞比例下降了,但免疫细胞比例上升了。具体来看,抗肿瘤的M1巨噬细胞、CD8+T细胞变多了,而促肿瘤的M2巨噬细胞变少了。通路分析也提示T细胞功能被激活了。洛贝林确实把坏的免疫环境往好的方向掰了掰(图2)

图2 ScRNA-seq分析显示,罗布麻碱能够延缓小鼠移植结直肠癌的生长

复现建议:取肿瘤消化成单细胞悬液,送10x单细胞测序。数据用CellRanger和Seurat处理,质控:UMI<10万、基因<6500、线粒体基因<10%。用FindAllMarkers找差异基因,Monocle2做拟时序。比较两组各细胞亚群的比例和功能变化。

03

洛贝林上调SLURP1表达

发现了洛贝林的一个关键“靶点基因”——Slurp1。通过单细胞测序的数据分析,他们看到洛贝林处理后Slurp1的mRNA水平明显上调了,而且这种上调主要发生在癌细胞里面。qPCR和Western blot进一步验证了,洛贝林剂量越高,Slurp1的mRNA和蛋白水平都跟着涨。免疫组化也直观地看到肿瘤里SLURP1蛋白变多了。所以结论就是:洛贝林能显著提升癌细胞中SLURP1的表达水平(图3)

图3 SLURP1的转录和翻译受到罗贝林的促进

复现建议:小鼠给药后取肿瘤。一部分提RNA做qPCR;一部分提蛋白做Western blot,用SLURP1抗体。石蜡切片做免疫组化。有条件也可在体外直接处理MC38细胞,看洛贝林对SLURP1的影响。

04

Slurp1敲除逆转洛贝林抑瘤效果

洛贝林的抑瘤作用到底是不是通过SLURP1实现的?他们用CRISPR/Cas9技术敲掉了MC38细胞的Slurp1基因,然后种到小鼠身上。结果发现,在Slurp1敲除的肿瘤里,洛贝林几乎不起作用了——肿瘤的体积和重量跟没用药的差不多。而正常的MC38肿瘤里,洛贝林效果很明显。这就说明,洛贝林的抑瘤效果很大程度上要依赖于SLURP1的存在(图4)

图4 Slurp1缺失逆转了洛贝林对肿瘤负荷的改善作用

复现建议:先用CRISPR构建Slurp1敲除MC38,Western blot验证。然后平行接种正常和敲除细胞。肿瘤长到100-150mm³时给洛贝林。比较四组的肿瘤生长曲线和瘤重,再用IHC检测SLURP1和PCNA。

05

癌细胞SLURP1调控巨噬细胞极化

前面发现的SLURP1和免疫细胞的变化给联系起来了。单细胞数据显示,洛贝林处理后M1巨噬细胞变多了、M2巨噬细胞变少了。M1相关的基因上调了,M2相关的基因下调了。拟时序分析进一步提示TAM有向M1方向极化的趋势。最关键的是,当敲掉癌细胞的Slurp1后,洛贝林对巨噬细胞的这种调控作用就被削弱了。这说明,是癌细胞分泌的SLURP1在“指挥”巨噬细胞的极化方向(图5)

图5 结肠癌细胞衍生的SLURP1参与了洛贝林调节巨噬细胞极化的过程

复现建议:用流式分析肿瘤中巨噬细胞亚群。抗体选CD45、CD11b、F4/80加上CD86和CD206。比较PBS组和洛贝林组的比例。也可用Slurp1敲除肿瘤做平行对比。体外可收集洛贝林处理过的MC38上清,加到巨噬细胞体系中看能否诱导M1极化。

06

MAPK14是洛贝林直接靶点

揭开了洛贝林的“直接靶点”的面纱。他们用了一种叫TRAP的技术筛选与洛贝林结合的蛋白质,结果从16个候选蛋白里锁定了MAPK14。等温滴定量热法确认了二者直接结合,亲和力达到16.6nM。分子对接预测了可能的结合位点,比如A34、R57、R67、R173等。把这些位点突变掉之后,结合能力几乎就丧失了。所以MAPK14确实是洛贝林在结直肠癌中的一个关键靶点(图6)

图6 MAPK14是宿黄素的靶蛋白

复现建议:TRAP:细胞用30µM洛贝林处理,裂解后甲醛标记,酶解成肽段,LC-MS/MS检测。ITC需要纯化的MAPK14和洛贝林,25°C下用ITC200滴定。MST验证突变体:荧光标记的MAPK14与梯度稀释的洛贝林混合,用Monolith NT.115测Kd。

Article Summary
文章小结

研究发现,洛贝林能直接结合癌细胞内的MAPK14蛋白,阻止其入核,从而减少p53对SLURP1的转录抑制。癌细胞分泌的SLURP1增多后,会促进巨噬细胞向抗肿瘤的M1型极化、抑制促肿瘤的M2型极化,同时激活CD8+ T细胞。动物实验证实,洛贝林与抗PD-1联用效果更佳,为结直肠癌治疗提供了新思路。

这篇研究机制和临床价值都很能打,如果你要做国自然,缺思路或分析,小柒能帮你落地,对国自然感兴趣,就找快来找小柒吧!

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  1. CONNECT:[ UseTime:0.000398s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000960s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000282s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001872s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000878s ]
  6. SELECT * FROM `set` [ RunTime:0.002112s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000959s ]
  8. SELECT * FROM `article` WHERE `id` = 572534 LIMIT 1 [ RunTime:0.006712s ]
  9. UPDATE `article` SET `lasttime` = 1780153960 WHERE `id` = 572534 [ RunTime:0.000891s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000330s ]
  11. SELECT * FROM `article` WHERE `id` < 572534 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006385s ]
  12. SELECT * FROM `article` WHERE `id` > 572534 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007782s ]
  13. SELECT * FROM `article` WHERE `id` < 572534 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009799s ]
  14. SELECT * FROM `article` WHERE `id` < 572534 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004353s ]
  15. SELECT * FROM `article` WHERE `id` < 572534 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012575s ]
0.126145s