Redox Biol:肌肽能减少骨髓细胞中抗瘤药CTX副作用造成的DNA损伤!

2017-09-20 Emma MedSci原创

骨髓细胞氧化DNA损伤是包括环磷酰胺(CTX)在内的化疗药物的主要副作用,然而并不是所有的抗氧化剂都能有效抑制氧化性DNA损伤这种副作用。

环磷酰胺(CTX)是广谱抗肿瘤药,用于治疗白血病及其他肿瘤,在体外无抗肿瘤活性,进入体内后先在肝脏中经微粒体功能氧化酶转化成醛磷酰胺,而醛酰胺不稳定,在肿瘤细胞内分解成酰胺氮芥及丙烯醛,酰胺氮芥对肿瘤细胞有细胞毒作用。环磷酰胺是双功能烷化剂及细胞周期非特异性药物,可干扰DNA及RNA功能,尤以对前者的影响更大,它与DNA发生交叉联结,抑制DNA合成,对S期作用最明显。骨髓细胞氧化DNA损伤是包括环磷酰胺(CTX)在内的化疗药物的主要副作用,然而并不是所有的抗氧化剂都能有效抑制氧化性DNA损伤这种副作用。

发表于Redox Biol的一篇文章中,研究人员报道了肌肽(β-丙氨酰-1-组氨酸), 一种具有丙烯醛螯合能力的特殊抗氧化剂,对CTX诱导的骨髓细胞抑制的抵抗作用。肌肽可以通过其抗氧化活性保护小鼠骨髓细胞免受CTX诱导的DNA损伤。

在用CTX(20mg/kg,iv,24h)处理的小鼠的骨髓细胞中,肌肽处理(100 mg/kg和200mg/kg,ip)显著抑制活性氧(ROS)和8-oxo-dG(8-羟基-2'-脱氧鸟苷)的产生,并减少骨骼染色体异常。肌肽处理显著减轻小鼠骨髓细胞中CTX诱导的G2/M阻滞,伴随着p-Chk1/Chk1和p-p53/p53的比例降低以及p21表达降低。此外,TUNEL阳性细胞计数减少,Bax和Cyt c的下调表达以及cleaved Caspase-3/Caspase-3比例降低显示肌肽处理也抑制了CTX引起的细胞凋亡。

原始出处:
Deng J, et al. Carnosine attenuates cyclophosphamide-induced bone marrow suppression by reducing oxidative DNA damage. Redox Biol. 2017 Aug 4;14:1-6. doi: 10.1016/j.redox.2017.08.003.

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    2018-06-14 zhwj
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    2018-06-26 柳叶一刀
  5. [GetPortalCommentsPageByObjectIdResponse(id=1824254, encodeId=cf1e182425445, content=<a href='/topic/show?id=56a932e7800' target=_blank style='color:#2F92EE;'>#副作用#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=46, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=32778, encryptionId=56a932e7800, topicName=副作用)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=8f0715, createdName=showtest, createdTime=Sun Apr 01 14:18:00 CST 2018, time=2018-04-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1767225, encodeId=13ef1e6722541, content=<a href='/topic/show?id=64f5343e2f' target=_blank style='color:#2F92EE;'>#Biol#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=41, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=3437, encryptionId=64f5343e2f, topicName=Biol)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=446937890434, createdName=12498ebem31暂无昵称, createdTime=Thu Dec 07 03:18:00 CST 2017, time=2017-12-07, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1991262, encodeId=da27199126218, content=<a href='/topic/show?id=c61a10200565' target=_blank style='color:#2F92EE;'>#骨髓细胞#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=55, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=102005, encryptionId=c61a10200565, topicName=骨髓细胞)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=a5d7367, createdName=zhwj, createdTime=Thu Jun 14 12:18:00 CST 2018, time=2018-06-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1917656, encodeId=b41f191e65623, content=<a href='/topic/show?id=4f26341994' target=_blank style='color:#2F92EE;'>#Bio#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=58, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=3419, encryptionId=4f26341994, topicName=Bio)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=778d36, createdName=柳叶一刀, createdTime=Tue Jun 26 03:18:00 CST 2018, time=2018-06-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1397328, encodeId=fe7c139e32894, content=<a href='/topic/show?id=8bee565436d' target=_blank style='color:#2F92EE;'>#损伤#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=43, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=56543, encryptionId=8bee565436d, topicName=损伤)], attachment=null, authenticateStatus=null, createdAvatar=https://thirdwx.qlogo.cn/mmopen/vi_32/DYAIOgq83eoNX3lUOlDKGBUEPNwZx0nibmdcFyeibnX4WMhUSCU2REpGRWtSmnT2CCs0dA5waxvJknYDxwtYnIcQ/132, createdBy=294e2500218, createdName=ms3046638856685384, createdTime=Fri Sep 22 04:18:00 CST 2017, time=2017-09-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1455034, encodeId=173e1455034b4, content=<a href='/topic/show?id=4f4a6103d8' target=_blank style='color:#2F92EE;'>#DNA损伤#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=34, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=6103, encryptionId=4f4a6103d8, topicName=DNA损伤)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=758a5627999, createdName=makuansheng, createdTime=Fri Sep 22 04:18:00 CST 2017, time=2017-09-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1468175, encodeId=404014681e56d, content=<a href='/topic/show?id=71c810212946' target=_blank style='color:#2F92EE;'>#髓细胞#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=34, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=102129, encryptionId=71c810212946, topicName=髓细胞)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=69e46898758, createdName=chengjn, createdTime=Fri Sep 22 04:18:00 CST 2017, time=2017-09-22, status=1, ipAttribution=)]
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    2017-09-22 chengjn

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