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IF14.5!郑州大学团队“国自然”仅八图拿下双一区顶刊!

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IF14.5!郑州大学团队“国自然”仅八图拿下双一区顶刊!

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这篇由郑州大学王永超、陈真真团队在 《Journal of Extracellular Vesicles》上报导了一项“借尸还魂”的纳米策略。他们构建了一个siXkr8/Dox@PMLC仿生纳米平台,打进去后,让肿瘤细胞自己“生产”载药凋亡小体

癌干细胞就是那个打不死的小强。它们躲在肿瘤深部的缺氧区,外面包着厚厚的基质,药根本进不去。更气人的是,它们高表达的CD24/Siglec-10免疫轴,像个“别吃我”的护身符,让巨噬细胞看见了也装瞎。“进不去”+“杀不了”,这就是CSCs导致复发转移的根儿。

文献解读

文章题目用于增强癌症干细胞治疗的原位工程化“级联放大”载药囊泡

发表期刊:Journal of Extracellular Vesicles

发表时间:2025年5月

影响因子:14.5/Q1

01

研究背景

癌症干细胞因自我更新能力和耐药性是肿瘤复发与转移的主要原因,但其主要定位于肿瘤微环境的深部缺氧区域,阻碍药物渗透;同时,CSCs过表达CD24/Siglec-10免疫检查点轴,显著抑制免疫清除,限制现有治疗策略的疗效。

02
研究目的

开发原位工程化“级联放大”载药囊泡递送系统,实现药物向CSCs富集区域的深度递送,并增强抗肿瘤免疫反应。

03
研究方法

生信分析挖掘公共数据库,分析结直肠癌中干性基因、CD24表达与患者预后的关系。

纳米构建:构建siXkr8/Dox@PMLC纳米粒。核心是PAMAM树状大分子载siXkr8,外层包裹Dox脂质体+巨噬细胞膜,表面修饰MMP-2响应的CD24阻断肽。

机制验证:利用流式细胞术检测PS暴露和巨噬细胞极化;共聚焦显微镜观察ApoBDs的生成和细胞摄取;3D肿瘤球和组织切片评估深层穿透;qPCR/WB验证Xkr8敲低效果。

研究结果
01

纳米递送系统设计与作用机制

王永超、陈真真团队他们首先搞出了这个siXkr8/Dox@PMLC级联载药囊泡系统,一张图就把核心机制讲得透透的【图1】示意图里更是直接把两大杀招标得明明白白:红色箭头是级联循环递送,绿黄符号是双重免疫调控。

图1. siXkr8/Dox@PMLC系统清除癌症干细胞的示意图

02

纳米平台表征

结构硬验证:TEM直接拍出siXkr8/Dox@PMLC是均匀的圆球形粒径刚好卡在133nm这个肿瘤富集的黄金尺寸【图2H】;DLS更实锤它稳得一批,在PBS里放72小时粒径变化都不到5%,不会在血液里提前团聚失效【图2J】

修饰双实锤:FTIR光谱直接抓到M-CSBP肽的特征峰,证明偶联成功【图2F】zeta电位从-18mV降到-25mV的特征变化又从电学角度二次验证了肽修饰,双重保险没毛病【图 2G】

图2. siRNA/Dox@PMLC的特性分析

03
体外抗肿瘤活性与ApoBDs功能

先是用CCK-8、流式和共聚焦三套实验,把纳米平台的核心功能焊得死死的;CCK-8直接打了游离药的脸,siXkr8/Dox@PMLC处理后CT26细胞活力只剩28%,比游离Dox组的52%杀瘤效果强了快一倍【图3A】

流式更狠,敲低Xkr8后,凋亡小体表面PS阳性率直接从对照组的45%砍到12%,这才是载药囊泡能躲开巨噬细胞的关键【图3I】;共聚焦更是直接拍到红色Dox荧光完整包在凋亡小体里,而且分离出来的凋亡小体杀伤效果远甩上清液证明药真的是靠囊泡递过去的,不是瞎飘的【图3K-L】

图3. 纳米制剂的体外抗肿瘤活性及Xkr8基因敲低的生物学效应

04
ApoBDs深度递送与免疫逃避

用3D肿瘤球+Transwell两套硬核实验,直接证实了 ApoBDs的深度递送和免疫逃避能力肿瘤球Z轴扫描直接打脸游离药,siXkr8/Dox@PMLC组的药能扎到80μm深,而游离Dox只能在0-20μm的表面晃悠,根本碰不到深部的CSCs【图4G

Transwell实验更狠,敲低Xkr8后,巨噬细胞对ApoBDs的吞噬率直接从50%砍到18%,降了整整2.8倍,完美躲开了免疫清除【图4B】

图4. 功能化ApoBD介导的深度递送

02
CSCs吞噬增强

用流式+共聚焦双实锤,把CD24阻断肽的CSC吞噬效果钉得死死的;流式直接给出硬数据,LAG-CSBP 单独处理后,巨噬细胞吞CSCs的效率直接从15%飙到42%,再联合载药凋亡小体更是冲到51%,翻了三倍还多【图5C】

共聚焦更是肉眼可见,紫色的巨噬细胞里塞满了绿色的CSCs,LAG-CSBP+ApoBDs组的吞噬数量碾压所有对照组【图5D】

图5. 体外纳米制剂促进巨噬细胞对癌症干细胞的吞噬作用

06
体内抑瘤效果

直接在体内把疗效和靶点效果锤得死死的;肿瘤重量直接打了游离药的脸,siXkr8/Dox@PMLC组只剩0.18g,比游离Dox组的0.62g轻了3倍还多【图6C】;H&E染色更是肉眼可见,这组的肿瘤坏死面积最大,几乎看不到完整的活肿瘤细胞【图6H】

更关键的是,体内靶点验证也没落下,肿瘤组织里的细胞表面PS阳性率直接从对照组的38%砍到11%【图6F】,证明Xkr8沉默不是体外的花架子,在体内也能实打实起效。

图6. siXkr8/Dox@PMLC在体内对CT26肿瘤生长的抑制作用

07
免疫激活

体内免疫微环境的逆转效果锤得板上钉钉;T细胞浸润直接拉满,siXkr8/Dox@PMLC组肿瘤里的CD8+T细胞比例从PBS组的5%飙到22%,翻了4.4倍,其中能杀肿瘤的IFN-γ阳性效应T细胞更是占到了18%【图7E-F】。

巨噬细胞这边更是彻底翻盘,免疫抑制的M2型比例从35%砍到12%,M1/M2比值直接升高3倍,把冷肿瘤硬生生变成了热肿瘤【图7A-B】

图7. 显示siXkr8/Dox@PMLC可激活抗肿瘤免疫反应

08
CSCs清除与转移抑制

直接从根源上掐断了肿瘤复发转移的命根子;干性基因直接被打趴下,siXkr8/Dox@PMLC组Oct4和Sox2的表达量比PBS组低了60%-70%,CSCs被精准清除【图8A-B】。

肺转移更是肉眼可见地被摁住,结节数从PBS组的28个砍到只剩8个,H&E染色也显示这组的转移灶面积最小【图8E-F】

图8.siXkr8/Dox@PMLC处理可降低癌症干细胞的比例

文章小结

这项研究构建了一个“纳米诱导剂-原位ApoBDs-级联递送-免疫重塑”的完整闭环。它利用内源性ApoBDs解决了外源EVs的制备难题,通过调控Xkr8解决了ApoBDs的清除难题,通过阻断CD24解决了CSC的免疫逃逸难题。这不仅是一个纳米递送系统的突破,更是一次对肿瘤免疫微环境的精准“策反”。

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  1. CONNECT:[ UseTime:0.000558s ] mysql:host=127.0.0.1;port=3306;dbname=i460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000879s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000281s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000284s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000477s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000579s ]
  8. SELECT * FROM `article` WHERE `id` = 539026 LIMIT 1 [ RunTime:0.000434s ]
  9. UPDATE `article` SET `lasttime` = 1781697208 WHERE `id` = 539026 [ RunTime:0.005068s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000292s ]
  11. SELECT * FROM `article` WHERE `id` < 539026 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000550s ]
  12. SELECT * FROM `article` WHERE `id` > 539026 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002384s ]
  13. SELECT * FROM `article` WHERE `id` < 539026 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.015476s ]
  14. SELECT * FROM `article` WHERE `id` < 539026 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002409s ]
  15. SELECT * FROM `article` WHERE `id` < 539026 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.039669s ]
0.159262s