在招募牙干细胞进行血管稳定时,塞马福林-4D信号传递
Lili Zhang1,2, Dineshi Sewvandi Thalakiriyawa2, Jiawei Liu2
1Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, 510055, Guangdong, China.
Stem cell research & therapy
|January 26, 2025
概括
通过一种涉及METTL3和PDGF-BB的表观遗传机制,Sema4D信号招募干细胞来稳定新的血管. 巨被确定为Sema4D的关键来源,用于这种血管稳定过程.
科学领域:
- 再生医学是一种再生医学.
- 血管生物学 血管生物学
- 干细胞生物学 干细胞生物学
背景情况:
- 血管稳定对于成功的组织再生至关重要.
- 内皮细胞和壁细胞在血管形成和稳定中起着至关重要的作用.
- 在干细胞支持的血管生成中,Sema4D-Plexin-B1信号的作用需要进一步阐明,特别是它对壁细胞招募和PDGF-BB分泌的影响.
研究的目的:
- 为了研究Sema4D-Plexin-B1对人类脱皮叶状牙 (SHED) 的干细胞的信号传递的体内影响.
- 阐明Sema4D影响PDGF-BB分泌的机制.
- 探索巨细胞作为Sema4D内源源的潜力,以稳定血管.
主要方法:
- 在体内进行Matrigel插头血管生成试验,以评估Sema4D对SHED支持的血管形成和稳定性的影响.
- 在体外实验中使用人类静脉内皮细胞 (HUVECs) 与Plexin-B1 knockdown和PDGFR-β抑制剂来探索调节机制.
- 在Sema4D治疗后,评估HUVEC中的m6A甲基化水平和METTL3表达.
- 通过ELISA量化巨细胞的Sema4D分泌,并使用芯片上的血管模型研究M2c巨细胞衍生的Sema4D在血管稳定中的作用.
主要成果:
- Sema4D促进了HUVEC驱动的透血管形成,并通过SM22α阳性SHED (SM22α+SHED) 增强了覆盖范围.
- 在HUVEC中降低plexin-B1或抑制PDGFR-β逆转了Sema4D诱导的血管稳定,证实了plexin-B1/PDGF-BB轴在Sema4D介导的壁细胞招募中的作用.
- Sema4D在HUVEC中调高了METTL3表达和m6A修饰,这对增强PDGF-BB分泌至关重要,表明存在表观遗传调节机制.
- 鉴定出M2c巨细胞是Sema4D的重要来源,它通过在芯片血管模型中诱导内皮PDGF的产生来招募SM22α+SHED作为壁细胞.
结论:
- 通过Plexin-B1作用的Sema4D诱导METTL3介导的PDGF-BB分泌,以招募SHED用于血管稳定.
- 大细胞,特别是M2c表型,是Sema4D的关键内源来源,在再生过程中促进血管稳定.
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