脂肪干细胞通过花生四烯酸衍生的环氧合酶-2/前列腺素E2级联抑制真皮成纤维细胞生长并诱导瘢痕疙瘩细胞凋亡

2022-03-02 MedSci原创 MedSci原创

瘢痕疙瘩的临床特征包括瘢痕疙瘩真皮源性成纤维细胞(KFBs)的异常增殖、分泌、分化和凋亡。但值得注意的是,KFBs的凋亡率低于增殖率。

瘢痕疙瘩的临床特征包括瘢痕疙瘩真皮源性成纤维细胞(KFBs)的异常增殖、分泌、分化和凋亡。值得注意的是,KFBs的凋亡率低于增殖率。尽管脂肪干细胞(ADSCs)对瘢痕疙瘩的抗纤维化作用已成为研究热点,但其旁分泌作用的确切抗纤维化机制仍不清楚。

该研究旨在了解 ADSCs 条件培养基 (ADSC-CM) 如何在 KFBs 中发挥抗纤维化作用。

图1 文章来源

研究团队先提取和培养 KFBs 和 ADSCs。然后,制备ADSC-CM。通过使用细胞计数试剂盒-8、5-乙炔基-2-脱氧尿苷 (Edu) 试剂盒和流式细胞术验证 ADSC-CM 是否可以抑制 KFB 生长和诱导细胞凋亡。通过实时荧光定量PCR和蛋白质印迹检测ADSC-CM培养的KFB中环氧合酶1(COX-1)、COX-2、caspase 3和B细胞淋巴瘤2(Bcl-2)的表达。为了阐明 COX-2 在 ADSC-CM 诱导的 KFB 细胞凋亡中的作用,将一种特定的 COX-2 抑制剂塞来昔布应用于在 ADSC-CM 中培养的 KFB。此外,研究者通过ELISA测试了花生四烯酸(AA)和前列腺素E2(PGE2)的产生。然后,研究者在裸鼠体内建立了瘢痕疙瘩移植模型,以验证体内治疗效果。

结果显示,在 ADSC-CM 中培养的 KFBs 的增殖能力减弱,细胞凋亡显着增加。

图2ADSC-CM 抑制 KFB 生长并诱导 KFB 凋亡。

在 ADSC-CM 培养的 KFB 中,Caspase 3 表达显着上调,Bcl-2 下调。此外,ADSC-CM 显着提高了 COX-2 mRNA 和蛋白质的表达,但 COX-1 的表达没有改变。

图3COX-2抑制改善了ADSC-CM诱导的细胞凋亡。

COX-2 抑制剂减少了 ADSC-CM 诱导的细胞凋亡。此外,COX-2 抑制阻断了 caspase 3 的升高并逆转了 Bcl-2 表达的下降。ADSC-CM 将 PGE2 水平提高了 1.5 倍,并且这种效应受到 COX-2 抑制的抑制。在裸鼠模型中,ADSC-CM 注射后,翻译的瘢痕疙瘩组织中 AA、COX-2 和 PGE2 的表达高于对照组。

图4 KFB 对 ADSC-CM 的响应。ADSC-CM 激活 AA-COX-2/PGE2 级联以抑制增殖并启动瘢痕疙瘩衍生成纤维细胞的凋亡,而特异性 COX-2 抑制剂可以阻断这一过程

总之,在人类瘢痕疙瘩真皮来源的成纤维细胞中,研究者确定了COX-2/PGE2 级联反应响应 ADSC 的激活。通过使用特定的 COX-2 抑制剂,COX-2/PGE2 级联激活在介导 ADSC-CM 诱导的 KFB 细胞凋亡和抗增殖作用中起关键作用。

该途径可能是 ADSCs 抗纤维化作用机制的关键因素。

原始来源:

Jinxiu Yang, Shiyi Li, Leren He, Minliang Chen, Adipose-derived stem cells inhibit dermal fibroblast growth and induce apoptosis in keloids through the arachidonic acid-derived cyclooxygenase-2/prostaglandin E2 cascade by paracrine,Burns & Trauma, Volume 9, 2021

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    2022-07-27 liuhuangbo
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    2022-12-10 makuansheng
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    2022-03-02 zhishijing
  4. 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  5. [GetPortalCommentsPageByObjectIdResponse(id=1967797, encodeId=6ffb196e797f9, content=<a href='/topic/show?id=c905e1228d9' target=_blank style='color:#2F92EE;'>#瘢痕疙瘩#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=131, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=71228, encryptionId=c905e1228d9, topicName=瘢痕疙瘩)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=6779163, createdName=liuhuangbo, createdTime=Wed Jul 27 16:18:05 CST 2022, time=2022-07-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1744873, encodeId=65b71e448732a, content=<a href='/topic/show?id=37c3325555a' target=_blank style='color:#2F92EE;'>#前列腺素#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=122, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=32555, encryptionId=37c3325555a, topicName=前列腺素)], attachment=null, authenticateStatus=null, createdAvatar=null, 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  6. 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    2022-03-02 zhouqu_8
  7. 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    2022-03-02 marongnuan
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    2022-03-02 wwzzly
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    2022-03-02 budeshao

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