抵抗素通過(guò)抑制細(xì)胞死亡和上調(diào)ABC轉(zhuǎn)運(yùn)蛋白的表達(dá)誘導(dǎo)多發(fā)性骨髓瘤多藥耐藥
[Abstract]:EXPERIMENTAL OBJECTIVES: In recent years, great progress has been made in the treatment of multiple myeloma due to the development of new drugs, but multiple myeloma is still an incurable hematological tumor due to recurrence and drug resistance. Cells participate in multidrug resistance of myeloma by secreting adipocytokines, but it is not clear which adipocytokines are involved in this process and the specific mechanism. This study explores the role of novel adipocytokine resistin in multidrug resistance of multiple myeloma and its related molecular mechanisms. Experimental methods: 1. Marfan, boron Tezomib or Carfezomib induced apoptosis of bone marrow CD138 + plasma cells from multiple myeloma cell lines and patients with myeloma. At the same time, different concentrations of resistin were added. Apoptosis was detected by Annexin V-FITC/PI double-labeled flow cytometry. 2. Apoptosis-related proteins and important myeloma cell survival signal pathway-related proteins were detected by Western blot. Specific inhibitors were used to block the signaling pathway and Annexin V-FITC/PI double-labeled flow cytometry was used to compare the changes of apoptosis rate. 3. Firstly, the effect of resistin on the function of ABC transporter protein was detected by flow cytometry. Secondly, the expression of ABCB1, ABCB3, ABCC1, ABCC3, ABCC4, ABCC5, ABCG2 was detected by real-time quantitative PCR. The expression of ABCG2 and ABC5 was inhibited by small interfering RNA (si RNA) technique, and the effect of ABCG2 and ABC5 Si RNA on resistance-induced multidrug resistance in multiple myeloma cell lines was observed. 4. Methylation-specific PCR (MS-PCR) was used to detect the expression of ABCG2 and ABC5 Si RNA. The effects of antibiotics on methylation of ABCG2 and ABC5 genes were detected by real-time quantitative PCR and Western blot. 5. Severe combined immune deficiency (SCID) mice were established by multiple myeloma cell line ARP-1. Twenty mice were randomly divided into four groups and treated with melphalan and/or resistin after 3 weeks of myeloma formation. The M protein content in plasma was detected by ELISA, CD138 + cells in bone marrow were detected by flow cytometry, and Annexin V-FITC/PI flow cytometry and DNA fragmentation in situ end labeling (TUNEL) were used. The results showed that resistin significantly inhibited the apoptosis of MAF-induced multiple myeloma cell lines ARP-1, MM.1S and U266 in a concentration-dependent manner. At the same time, resistin also inhibited the apoptosis of ARP-1, MM.1S and RPMI8226 cells induced by bortezomib and carfezomib. The apoptosis-related proteins cleaved caspase-9, cleaved caspase-3, cleaved PARP and Bax were significantly decreased in ARP-1 and MM.1S cells compared with those in melphalan treatment group, while the inhibitor of apoptosis proteins Bcl-2 and Bcl-Xl were significantly decreased in resistin and melphalan treatment groups. Furthermore, we found that resistin significantly increased the phosphorylation levels of I kappa Ba, Akt, and ERK1/2, and that NF-kappa B and PI3K inhibitors significantly decreased the anti-apoptotic protective effect of resistin on myeloma cell lines. ABC5 transporters were significantly increased in multiple myeloma cell lines. After interfering with ABCG2 and ABC5 gene expression, resistin had no protective effect on myeloma cell apoptosis induced by melphalan, bortezomib and carfezomib. In vivo, we used the M protein content in plasma to reflect the tumor load in mice. We found that the M protein content in plasma of the mice treated with resistin and melphalan was significantly higher than that of the mice treated with melphalan, and the CD138 + cells in bone marrow were significantly increased. Conclusion: 1. Resistin can inhibit the apoptosis of myeloma cells induced by various chemotherapeutics. 2. Resistin exerts its protective effect on myeloma cells by activating the anti-apoptosis signaling pathway NF-kappa B and PI3K/Akt. Resistin can reduce the expression of methyltransferase DNMT1 and DNMT3a, increase the expression of ABC transporter protein and drug efflux function, so as to play its anti-apoptosis role. 4. In vivo experiments further confirmed the role of resistin in promoting multidrug resistance in multiple myeloma.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2017
【分類號(hào)】:R733.3
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