人UGT1A3重组酶催化芹菜素葡醛酸结合反应

目的旨在了解人UGT1A3重组酶与芹菜素的有关代谢及其酶动力学参数,并阐述不同有机溶剂对酶动力学参数测定的影响。方法采用Bac-to-Bac系统表达人UGT1A3重组酶与芹菜素37℃共孵育,用HPLC法测定孵育液中剩余底物浓度,利用Lineweaver Burk法计算酶动力学参数,并进一步进行代谢物的确认。同时考察了用不同有机溶剂溶解底物对酶动力学参数测定的影响。结果采用Bac-to-Bac系统表达人UGT1A3重组酶,测得其催化芹菜素的Km为(28.88±2.47)μmol.L-1,Vmax为(224.19±21.11)nmol.m in-1.g-1,Vmax/Km为(7.75±0.29)mL.m in-1.g-1。不同有机溶剂对酶动力学参数测定无显著影响。结论芹菜素可被人UGT1A3重组酶催化,进行葡醛酸结合反应。     

MiR-142-3p对THP-1细胞腺苷酸环化酶9的表达调控作用

目的 明确内毒素脂多糖（LPS）对microRNA-142-3p（miR-142-3p）的表达调控作用及miR-142-3p的作用靶点.方法 体外培养人单核细胞株THP-1,用LPS刺激48 h后,real-time RT-PCR方法检测miR-142-3p和腺苷酸环化酶9（AC-9）的表达变化.接着采用脂质体转染的方法,将miR-142-3p的拟似物（mimic）和抑制剂（inhibitor）转染进入THP-1细胞,观察AC-9的表达变化.应用SPSS13.0统计软件,采取t检验进行数据统计.结果 THP-1细胞受LPS刺激48 h后,miR-142-3p的表达上调（P＜0.05）,AC-9表达则减少（P＜0.05）.上调miR-142-3p水平后,细胞内AC-9的表达水平出现下降（P＜0.05）,而抑制miR-142-3p的水平后,细胞内AC-9的表达水平上升（P＜0.05）.结论 miR-142-3p可调控THP-1细胞AC-9基因表达水平,且可能具有类似LPS的促炎机制,提示miR-142-3p在调控免疫细胞的炎症反应过程中具有重要的作用.     

Mesenchymal stem cell-originated exosomal circDIDO1 suppresses hepatic stellate cell activation by miR-141-3p/PTEN/AKT pathway in human liver fibrosis

Liver fibrosis is a common pathologic stage of the development of liver failure. It has showed that exosomes loaded with therapeutic circRNAs can be manufactured in bulk by exosome secreted cells in vitro, thus enabling personalized treatment. This study aimed to investigate the role of exosome-based delivery of circDIDO1 in liver fibrosis. Levels of genes and proteins were examined by qRT-PCR and Western blot. Cell proliferation, apoptosis, and cell cycle were analyzed by using cell counting kit-8 (CCK-8) assay, EdU assay, and flow cytometry, respectively. The binding between circDIDO1 and miR-141-3p was confirmed by dual-luciferase reporter, RNA pull-down and RIP assays. Exosomes were isolated by ultracentrifugation, and qualified by transmission electron microscopy (TEM), nanoparticle tracking analysis (NTA) and Western blot. CircDIDO1 overexpression or miR-141-3p inhibition suppressed the proliferation, reduced pro-fibrotic markers, and induced apoptosis as well as cell cycle arrest in hepatic stellate cells (HSCs) by blocking PTEN/AKT pathway. Mechanistically, circDIDO1 acted as an endogenous sponge for miR-141-3p, further rescue experiments showed that circDIDO1 suppressed HSC activation by targeting miR-141-3p. Extracellular circDIDO1 could be incorporated into exosomes isolated from mesenchymal stem cells (MSCs), and transmitted to HSCs to restrain HSC activation. Clinically, low levels of serum circDIDO1 in exosome were correlated with liver failure, and serum exosomal circDIDO1 had a well diagnostic value for liver fibrosis in liver failure patients. Transfer of circDIDO1 mediated by MSC-isolated exosomes suppressed HSC activation through the miR-141-3p/PTEN/AKT pathway, gaining a new insight into the prevention of liver fibrosis in liver failure patients.     

miR-141-3p靶向调控FOXA1对肺炎链球菌感染的肺泡上皮细胞增殖凋亡的影响

目的 探讨miR-141-3p对肺炎链球菌感染的肺泡上皮细胞增殖及凋亡的影响及其分子机制.方法 以AECⅡ细胞为研究对象,分别将miR-NC、miR-141-3p mimics、si-NC、si-FOXA1、miR-141-3p mimics+pcDNA3.1、miR-141-3p mimics+pcDNA3.1-FO...     

LncRNA KCNQ1OT1通过调控 miR-506-3p表达调节喉鳞状细胞癌细胞的生物学行为

目的 探讨长链非编码RNA(LncRNA)KCNQ1重叠转录物1(KCNQ1OT1)对喉鳞状细胞癌细胞生物学的影响及作用机制.方法 于2019年5月至2020年2月,采用RT-qPCR法检测了45例来自山东大学齐鲁医院桓台分院喉鳞状细胞癌病人的癌组织和癌旁组织及购自上海研生实业有限公司的人胚肺成纤维细胞WI-38和购自中国科学院上海细胞库的喉鳞状细胞癌细胞系(EV-SCC-18、AMC-HN-8和HCC345)中KCNQ1OT1和miR-506-3p表达.以HCC345细胞为研究对象,转染KCNQ1OT1小干扰RNA或共转染KCNQ1OT1小干扰RNA与miR-506-3p抑制剂至HCC345细胞后,MTT法、流式细胞术、Transwell分别检测细胞增殖、凋亡、迁移和侵袭.双荧光素酶报告基因实验验证KCNQ1OT1与miR-506-3p的调控关系.结果 喉鳞状细胞癌组织中KCNQ1OT1表达高于癌旁组织[(0.81±0.09)比(0.27±0.08)],miR-506-3p表达低于癌旁组织[(0.24±0.08)比(0.83±0.09)].喉鳞状细胞癌细胞系(EV-SCC-18、AMC-HN-8和HCC345)中KCNQ1OT1表达均高于WI-38细胞[(2.44±0.22)、(2.69±0.21)、(3.61±0.24)比(1.00±0.13)],miR-506-3p表达均低于WI-38细胞[(0.41±0.13)、(0.30±0.12)、(0.22±0.11)比(1.00±0.12)].与未敲减KCNQ1OT1的HCC345细胞比较,敲减KCNQ1OT1的HCC345细胞活力[(0.41±0.06)比(0.81±0.12)]、迁移数[(86.32±15.21)个比(162.31±20.23)个]和侵袭数[(65.23±12.05)个比(140.26±18.27)个]均降低,细胞凋亡率升高[(34.13±3.60)％比(3.79±2.37)％].KCNQ1OT1在HCC345细胞中负调控miR-506-3p表达.敲减miR-506-3p逆转敲减KCNQ1OT1对HCC345细胞增殖、凋亡、迁移和侵袭的影响.结论 KCNQ1OT1在喉鳞状细胞癌组织和细胞系中表达升高,其通过靶向miR-506-3p促进喉鳞状细胞癌细胞的恶性生物学行为.     

LncRNA-MALAT1通过miR-142-3p/TEAD1分子轴调控结直肠癌细胞增殖与凋亡#br#

目的　探讨长链非编码RNA-肺腺癌转移相关转录子1（LncRNA-MALAT1）对结直肠癌细胞增殖与凋亡的影响及相关作用机制。方法　通过Real-time PCR与Western blot实验检测结直肠癌细胞株与人正常结肠上皮细胞中LncRNA-MALAT1、miR-142-3p基因以及TEA结构域转录因子1（TEAD1）蛋白的表达;使用si-MALAT1转染HCT116细胞,在此基础上共转染miR-142-3p inhibitor,利用Real-time PCR与Western blot检测细胞中LncRNA-MALAT1与miR-142-3p基因以及TEAD1、Bax、Bcl-2与Cyclin D1蛋白的表达,通过CCK-8实验检测细胞的增殖水平,通过流式细胞术检测细胞的凋亡水平,通过双荧光素酶实验检测LncRNA-MALAT1与miR-142-3p以及miR-142-3p与TEAD1的结合。结果　与人正常结肠上皮细胞相比,结直肠癌细胞株中LncRNA-MALAT1基因与TEAD1蛋白呈高表达,miR-142-3p基因呈低表达（P＜0.05）;沉默LncRNA-MALAT1能够促进miR-142-3p基因与Bax蛋白表达,抑制LncRNA-MALAT1基因以及Bcl-2、Cyclin D1与TEAD1蛋白表达,抑制细胞增殖,并促进细胞凋亡;在此基础上沉默miR-142-3p能够对上述调控作用实现部分逆转;双荧光素酶实验结果显示,LncRNA-MALAT1与miR-142-3p以及miR-142-3p与TEAD1能够结合。结论　LncRNA-MALAT1能够结合miR-142-3p,促进miR-142-3p靶基因TEAD1表达,进而促进结直肠癌细胞增殖,抑制其细胞凋亡,促进结直肠癌的病理进程。     

Phoenixin-14 regulates proliferation and apoptosis of vascular smooth muscle cells by modulation of KCNQ1OT1/miR-183-3p/CTNNB1 axis

Phoenixin-14 has been reported to be implicated in the process of blood glucose metabolism, reproduction, lipid deposition and cardioprotection. However, the role of phoenixin-14 in vascular smooth muscle cells (VSMCs) remains unkown. In this study, we focused on the effects of phoenixin-14 on VSMCs under oxidized low-density lipoprotein (ox-LDL) treatment. The experimental results demonstrated that phoenixin-14 inhibited mRNA level and nuclear translocation of β-catenin. Functionally, phoenixin-14 inhibited cell proliferation and facilitated apoptosis of VSMCs under ox-LDL stimulation, and CTNNB1 overexpression reversed these effects. Mechanistically, KCNQ1OT1 interacted with miR-183-3p to upregulate CTNNB1 in VSMCs. Furthermore, CTNNB1 expression was negatively correlated with miR-183-3p but positively associated with KCNQ1OT1. Rescue assays indicated that KCNQ1OT1 overexpression or Lithium chloride (LiCl) treatment reversed the effects of phoenixin-14 on proliferation and apoptosis of ox-LDL-stimulated VSMCs. In summary, phoenixin-14 regulates proliferation and apoptosis of ox-LDL-treated VSMCs by regulating the KCNQ1OT1/miR-183-3p/CTNNB1 axis.     

Melatonin promotes cardiomyocyte proliferation and heart repair in mice with myocardial infarction via miR-143-3p/Yap/Ctnnd1 signaling pathway

The neonatal heart possesses the ability to proliferate and the capacity to regenerate after injury; however, the mechanisms underlying these processes are not fully understood. Melatonin has been shown to protect the heart against myocardial injury through mitigating oxidative stress, reducing apoptosis, inhibiting mitochondrial fission, etc. In this study, we investigated whether melatonin regulated cardiomyocyte proliferation and promoted cardiac repair in mice with myocardial infarction (MI), which was induced by ligation of the left anterior descending coronary artery. We showed that melatonin administration significantly improved the cardiac functions accompanied by markedly enhanced cardiomyocyte proliferation in MI mice. In neonatal mouse cardiomyocytes, treatment with melatonin (1 μM) greatly suppressed miR-143-3p levels. Silencing of miR-143-3p stimulated cardiomyocytes to re-enter the cell cycle. On the contrary, overexpression of miR-143-3p inhibited the mitosis of cardiomyocytes and abrogated cardiomyocyte mitosis induced by exposure to melatonin. Moreover, Yap and Ctnnd1 were identified as the target genes of miR-143-3p. In cardiomyocytes, inhibition of miR-143-3p increased the protein expression of Yap and Ctnnd1. Melatonin treatment also enhanced Yap and Ctnnd1 protein levels. Furthermore, Yap siRNA and Ctnnd1 siRNA attenuated melatonin-induced cell cycle re-entry of cardiomyocytes. We showed that the effect of melatonin on cardiomyocyte proliferation and cardiac regeneration was impeded by the melatonin receptor inhibitor luzindole. Silencing miR-143-3p abrogated the inhibition of luzindole on cardiomyocyte proliferation. In addition, both MT1 and MT2 siRNA could cancel the beneficial effects of melatonin on cardiomyocyte proliferation. Collectively, the results suggest that melatonin induces cardiomyocyte proliferation and heart regeneration after MI by regulating the miR-143-3p/Yap/Ctnnd1 signaling pathway, providing a new therapeutic strategy for cardiac regeneration.     

Long non-coding RNA SNHG16 promotes lipopolysaccharides-induced acute pneumonia in A549 cells via targeting miR-370-3p/IGF2 axis

BackgroundPneumonia is an infectious lung inflammation in children with high mortality and morbidity rates. Small nucleolar RNA host gene 16 (SNHG16) has been verified to accelerate the progression of acute pneumonia. However, the role of SNHG16 in acute pneumonia has not yet been fully elucidated. The study was aimed to explore the regulatory mechanism of SNHG16 in LPS-induced acute pneumonia in A549 cells.MethodsThe levels of SNHG16, miR-370-3p and IGF2 in serum samples and LPS-induced A549 cells were detected by quantitative real-time polymerase chain reaction (qRT-PCR). The cell viability and apoptosis of A549 cells were examined by Cell Counting Kit-8 (CCK-8) assay and flow cytometer, respectively. The levels of interleukin 1β (IL-1β), interleukin 6 (IL-6) and tumor necrosis factor α (TNF-α) were determined by enzyme-linked immunosorbent assay (ELISA). The binding relationships among SNHG16, miR-370-3p and IGF2 were predicted by online database and verified by Dual-luciferase reporter and RNA immunoprecipitation (RIP) assays. The protein levels of IGF2 were tested by Western blot.ResultsSNHG16 and IGF2 were upregulated while miR-370-3p was downregulated in serum of acute pneumonia patients and LPS-induced A549 cells. SNHG16 regulated proliferation, apoptosis and inflammatory cytokines by inhibiting miR-370-3p in LPS-induced A549 cells. MiR-370-3p targeted IGF2 and inhibited LPS-induced inflammatory injury via IGF2 in A549 cells. Furthermore, SNHG16 was verified to promote IGF2 expression by sponging miR-370-3p in A549 cells.ConclusionSNHG16 impeded cell viability and promoted apoptosis, inflammatory injury by targeting IGF2 mediated by miR-370-3p in LPS-induced A549 cells.     

Zinc enhances CDKN2A,pRb1 expression and regulates functional apoptosis via upregulation of p53 and p21 expression in human breast cancer MCF-7 cell

Zinc (Zn) is an essential trace elements, its deficiency is associated with increased incidence of human breast cancer. We aimed to study the effect of Zn on human breast cancer MCF-7 cells cultured in Zn depleted and Zn adequate medium. We found increased cancer cell growth in zinc depleted condition, further Zn supplementation inhibits the viability of breast cancer MCF-7 cell cultured in Zn deficient condition and the IC_25, IC₅₀ value for Zn is 6.2 μM, 15 μM, respectively after 48 h. Zn markedly induced apoptosis through the characteristic apoptotic morphological changes and DNA fragmentation after 48 h. In addition, Zn deficient cells significantly triggered intracellular ROS level and develop oxidative stress induced DNA damage; it was confirmed by elevated expression of CYP1A, GPX, GSK3β and TNF-α gene. Zinc depleted MCF-7 cells expressed significantly (p ≤ 0.001) decreased levels of CDKN2A, pRb1, p53 and increased the level of mdm2 expression. Zn supplementation (IC₅₀ = 15 μM), increased significantly CDKN2A, pRB1 & p53 and markedly reduced mdm2 expression; also protein expression levels of CDKN2A and pRb1 was significantly increased. In addition, intrinsic apoptotic pathway related genes such as Bax, caspase-3, 8, 9 & p21 expression was enhanced and finally induced cell apoptosis. In conclusion, physiological level of zinc is important to prevent DNA damage and MCF-7 cell proliferation via regulation of tumor suppressor gene.     

双酚A对小鼠睾丸间质细胞毒性及miR-203-3p和PI3K/AKT/FOXO1信号通路的影响

目的研究双酚A对小鼠睾丸间质细胞的毒性作用,及对miR-203-3p和PI3K/AKT/FOXO1信号通路的影响。方法不同浓度BPA(0、2、10、50、250μmol/L)处理小鼠睾丸间质细胞24 h,CCK8法检测细胞活力,Real time PCR检测miR-203-3p和FOXO1、AKT、PI3K的相对表达水平。结果不同浓度BPA处理细胞后,细胞活力随BPA剂量的增大而减少,50、250μmol/L组与对照组比较,差异有统计学意义(P<0.001)。各处理组miR-203-3p表达量均较对照组升高,10、250μmol/L组与对照组比较,差异有统计学意义(P<0.05)。2、10μmol/L组FOXO1表达量较对照组升高,50、250μmol/L组表达量较对照组降低,2、50、250μmol/L组FOXO1相对表达量与对照组比较差异有统计学意义(P<0.001)。各处理组AKT水平均出现下降趋势,10、50、250μmol/L组与对照组比较,差异有统计学意义(P<0.001)。各处理组PI3K水平均出现下降趋势,50、250μmol/L组与对照组比较,差异有统计学意义(P<0.001)。结论双酚A致睾丸间质细胞损伤,影响miR-203-3p和FOXO信号通路相关基因的改变。     

长链非编码 RNA人类白细胞抗原复合体 18通过微 RNA-497-5p/细胞周期蛋白 E1轴调节弥漫性大 B细胞淋巴瘤的增殖、凋亡和侵袭

目的探讨长链非编码 RNA人类白细胞抗原复合体 18(lncRNA HCG18)调控微 RNA-497-5p(miR-497-5p)/细胞周期蛋白 E1(CCNE1)轴对弥漫性大 B细胞淋巴瘤( DLBCL)细胞增殖、凋亡和侵袭的影响。方法实时荧光定量 PCR(qRT-PCR)、蛋白质印迹法分别检测 2018年 5月至 2021年 5月收集的恩施土家族苗族自治州中心医院 DLBCL病人淋巴组织、良性淋巴结增生病人的淋巴组织、人正常 B细胞永生化细胞 HMy2.CIR、DLBCL细胞系 SU-DHL-1、OCI-LY8、U2932中 HCG18、miR-497-5p表达及 CCNE1蛋白表达,将 OCI-LY8细胞分为 Ct组(正常培养的 OCI-LY8细胞)、 pcDNA组(细胞转染过表达物阴性对照)、 pcD? NA-HCG18组(细胞转染 HCG18过表达物)、 si-NC组(细胞转染小干扰 RNA阴性对照)、 si-HCG18组(细胞转染 HCG18小干扰 RNA)、 si-HCG18+inhibitorNC组(细胞转染 HCG18小干扰 RNA和抑制物阴性对照)、 si-HCG18+miR-497-5p inhibitor组(细胞转染 HCG18小干扰 RNA和 miR-497-5p抑制物),CCK-8法检测细胞增殖,流式细胞术检测细胞凋亡, Transwell检测细胞侵袭,蛋白质印迹法检测 CCNE1、增殖细胞核抗原( PCNA)、 Bcl-2相关 X蛋白( Bax)、基质金属蛋白酶 9(MMP-9)蛋白表达,双萤光素酶验证 HCG18与 miR-497-5p、miR-497-5p与 CCNE1的关系。结果在 DLBCL淋巴组织和细胞中, HCG18、CCNE1蛋白高表达, miR-497-5p低表达,且在 OCI-LY8细胞中 HCG18、CCNE1蛋白表达上调最高, miR-497-5p表达下调最多( P<0.05)因此,以 OCI-LY8细胞进行后续研究,与 si-NC组比较, si-HCG18组 HCG18(0.26±0.03比 1.01±0.01)、 CCNE1蛋白( 0.45±0.03比,1.44±0.19)表达降低, miR-497-5p(1.95±0.14比 1.03±0.02)表达升高( P<0.05)与 pcDNA组比较, pcDNA-HCG18组 HCG18(1.96±0.23比 1.02±0.01)、 CCNE1蛋白( 2.33±0.21比 1.42±0.18)表达升高, miR-497-5,p(0.28±0.02比 1.02±0.02)表达降低( P<0.05),与 siHCG18组、 si-HCG18+inhibitor NC组比较, miR-497-5p表达降低( 1.21±0.09比 1.95±0.14、1.94±0.13)CCNE1蛋白( 0.87±0.08比0.45±0.03、0.44±0.04)表达上调( P<0.05)沉默 HCG18可抑制 OCI-LY8细胞增殖、侵袭行为及 PCNAMP-9蛋白表达,诱导细胞凋亡及 Bax蛋白表达,而上调 HCG18相反趋势,下调 miR-497-5p逆转了沉默 HCG18对 OCI-LY8细胞增殖、侵袭、凋亡的影响, HCG18靶向调控 miR-497-5p/CCNE1。结论沉默 HCG18可能通过调控 miR-497-5p/CCNE1抑制 OCI-LY8细胞增殖、侵袭,诱导细胞凋亡。     

LncRNA OIP5-AS1调节miR-25-3p/SOX4轴对高糖诱导的人肾小管上皮细胞生物学过程的影响

目的 探讨长链非编码RNA Opa相互作用蛋白5-反义转录物1(lncRNA OIP5-AS1)对高糖诱导的人肾小管上皮细胞增殖、凋亡和氧化应激损伤的影响及分子机制。方法 体外培养人肾皮质近曲小管上皮细胞HK-2,分为正常葡萄糖组（NG组）、高糖组（HG组）、HG+si-NC组、HG+si-OIP5-AS1组、HG+miR-NC组、HG+miR-25-3p组、HG+si-OIP5-AS1+inhibitor-NC组、HG+si-OIP5-AS1+miR-25-3p inhibitor组。转染48 h后,实时荧光定量PCR(qPCR)检测细胞中lncRNA OIP5-AS1、miR-25-3p和性别决定区Y框蛋白4(SOX4)m RNA水平;CCK-8法检测细胞活力;检测细胞培养上清液中乳酸脱氢酶（LDH）活性;流式细胞术分析细胞凋亡情况;检测细胞中丙二醛（MDA）水平和超氧化物歧化酶（SOD）、过氧化氢酶（CAT）活性;DCFH-DA荧光探针检测细胞内活性氧（ROS）的产生;Western blot实验检测细胞中SOX4、B细胞淋巴瘤因子2(Bcl-2)、Bcl-2相关X蛋白（Bax）...