5-氟尿嘧啶诱导的造血损伤中骨髓基质重建相关基因的表达及其意义

Expression Changes of Matrix Reconstitution-related Genes in Bone Marrow during 5-Fluorouracil-Induced Hemopoietic Injury and Their Significance

目的:探究胞外基质重建相关基因在氟尿嘧啶(5-fluorouracil,5-FU)诱导的造血损伤重建中的表达及其意义。方法:采用C57BL/6小鼠腹腔注射5-FU(200 mg/kg)建立造血损伤模型。注射后3、6、9、15、21、27 d常规检测外周血象;在相同时间点用TRIzol法提取骨髓总RNA,反转录后以实时荧光定量PCR(RT-q PCR)检测胞外基质重建相关基因的mRNA水平,包括细胞外基质(ECM-1)、明胶酶(MMP-2)、基质降解素(MMP-3)、胶原酶(MMP-13)、组织金属酶抑制剂(TIMP-1)基因。结果:小鼠经5-FU注射后外周血出现典型的造血损伤与修复过程,且红细胞、白细胞、血小板损伤修复的动态不同;RT-q PCR显示在5-FU损伤期骨髓胞外基质重建相关基因的表达均显著上调,MMP-2在注射5-FU后第3天时表达最高,MMP-3、MMP-13、TIMP-1、ECM-1在第6天表达最高;MMP-3在骨髓中表达较低,但损伤后上升幅度最大。结论:在5-FU建立的骨髓造血损伤模型中,胞外基质重建相关基因可能参与造血损伤和随后骨髓基质的重构过程,且不同基因发挥的时段和作用对象不同,但彼此协同为造血损坏后重建奠定基础。

Objective： To explore the expression change of the genes related with matrix reconstitution during the injury and reconstitution of murine bone marrow following treatment with 5-fluorouracil （5-FU）. Methods：C57BL/6 mice received intraperitoneal injection of 5-FU （200 mg/kg）, and peripheral blood cell counts were monitored at 3, 6, 9, 15, 21, 27 days after treatment. Bone marrow cells were harvested at these times for total RNA extraction using TRIzol. Reverse transcriptions in combination with real-time PCR were performed for detecting expression of genes related with matrix reconstitution, including ECM-1, MMP-2, MMP-3, MMP-13 and TIMP-1. Results： After injection of 5-FU, the numbers of three line cells in peripheral blood （i. e. RBC, WBC and platelets ） decreased and then recovered with differential dynamics. Similarly, RT-qPCR revealed that all the 5 detected gene expressions were significantly up-regulated during the injury. The mRNA expression of MMP-2 reached to peak at day 3 while the other genes reached to peak at day 6. MMP-3 has a low expression when compared with others, but its expression increased significantly after injury. Conclusion： In 5-FU induced hematopoietic injury and reconstitution model, matrix reconstitution-related genes may play an important role in hematopoietic reconstitution, but different genes play different roles at various time, and cooperate with each other for hematopoietic reconstitution.