miR-100-5p对急性髓系白血病细胞增殖及凋亡的影响及其分子机制

樊小如 ,  杨莹 ,  孙寅 ,  杜聪梅

中国当代儿科杂志 ›› 2026, Vol. 28 ›› Issue (01) : 99 -106.

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中国当代儿科杂志 ›› 2026, Vol. 28 ›› Issue (01) : 99 -106. DOI: 10.7499/j.issn.1008-8830.2503192
论著·实验研究

miR-100-5p对急性髓系白血病细胞增殖及凋亡的影响及其分子机制

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Effects of miR-100-5p on proliferation and apoptosis of acute myeloid leukemia cells and the underlying molecular mechanism

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摘要

目的 探讨微小RNA(miRNA, miR)-100-5p靶向Tribbles同源蛋白1(Tribbles pseudokinase 1, TRIB1)对急性髓系白血病细胞增殖及凋亡活性的影响。 方法 收集16例健康体检儿童(对照组)和16例AML患儿(AML组)外周血。将HL-60细胞分为空白组、mimic NC组、miR-100-5p mimic组、si-NC组、si-TRIB1组、miR-100-5p mimic+TRIB1过表达质粒阴性对照(OE-NC)组、miR-100-5p mimic+TRIB1过表达质粒(OE-TRIB1)组。采用实时荧光定量PCR检测外周血和HL-60细胞中miR-100-5p、TRIB1 mRNA表达;5-乙炔基-2'脱氧尿嘧啶核苷(5-ethynyl-2'-deoxyuridine, EdU)染色、CCK-8法检测HL-60细胞增殖;流式细胞术检测HL-60细胞凋亡;Western blot法检测HL-60细胞中TRIB1、增殖细胞核抗原(proliferating cell nuclear antigen, PCNA)、p53、程序性死亡受体-1(programmed cell death protein 1, PD-1)、程序性死亡受体-配体1(programmed death-ligand 1, PD-L1)蛋白表达;双萤光素酶报告基因实验验证miR-100-5p与TRIB1靶向关系。 结果 与对照组比较,AML组外周血中miR-100-5p表达降低,TRIB1 mRNA表达升高(P<0.05)。与空白组、mimic NC组比较,miR-100-5p mimic组miR-100-5p表达、细胞凋亡率、p53蛋白表达升高,TRIB1 mRNA表达、EdU阳性率、光密度(optical density, OD)450值及TRIB1、PCNA、PD-1、PD-L1蛋白表达降低(P<0.05);与空白组、si-NC组比较,si-TRIB1组TRIB1 mRNA表达、EdU阳性率、OD450值及TRIB1、PCNA、PD-1、PD-L1蛋白表达降低,细胞凋亡率、p53蛋白表达升高(P<0.05);与miR-100-5p mimic组、miR-100-5p mimic+OE-NC组比较,miR-100-5p mimic+OE-TRIB1组TRIB1 mRNA表达、EdU阳性率、OD450值及TRIB1、PCNA、PD-1、PD-L1蛋白表达升高,细胞凋亡率、p53蛋白表达降低(P<0.05);TRIB1-WT + miR-100-5p mimic组萤光素酶活性低于TRIB1-WT + mimic NC组(P<0.05)。 结论 过表达miR-100-5p可通过下调TRIB1抑制HL-60细胞增殖,诱导细胞凋亡。

Abstract

Objective To investigate whether miR-100-5p regulates the proliferation and apoptosis of acute myeloid leukemia (AML) cells by targeting Tribbles pseudokinase 1 (TRIB1). Methods Peripheral blood was collected from 16 healthy children (control group) and 16 children with AML (AML group). HL-60 cells were divided into seven groups: blank, mimic negative control (mimic NC), miR-100-5p mimic, small interfering RNA negative control (si-NC), si-TRIB1, miR-100-5p mimic + TRIB1 overexpression plasmid negative control (OE-NC), and miR-100-5p mimic + TRIB1 overexpression plasmid (OE-TRIB1). The expression of miR-100-5p and TRIB1 mRNA in peripheral blood and HL-60 cells was detected by quantitative real-time PCR. Cell proliferation was assessed by 5-ethynyl-2'-deoxyuridine (EdU) staining and the cell counting kit-8 (CCK-8) assay (OD450). Apoptosis was analyzed by flow cytometry. Protein levels of TRIB1, proliferating cell nuclear antigen (PCNA), p53, programmed cell death protein 1 (PD-1), and programmed death-ligand 1 (PD-L1) were determined by Western blot. The targeting relationship between miR-100-5p and TRIB1 was validated by a dual-luciferase reporter assay. Results Compared with the control group, miR-100-5p expression was decreased and TRIB1 mRNA expression was increased in the peripheral blood of the AML group (P<0.05). Compared with the blank and mimic NC groups, the miR-100-5p mimic group showed higher miR-100-5p expression, apoptosis rate, and p53 protein, and lower TRIB1 mRNA expression, EdU-positive rate, OD450 value, and TRIB1, PCNA, PD-1, and PD-L1 proteins (P<0.05). Compared with the blank and si-NC groups, the si-TRIB1 group exhibited reduced TRIB1 mRNA expression, EdU-positive rate, OD450 value, and TRIB1, PCNA, PD-1, and PD-L1 proteins, together with increased apoptosis rate and p53 protein (P<0.05). Compared with the miR-100-5p mimic and miR-100-5p mimic + OE-NC groups, the miR-100-5p mimic + OE-TRIB1 group had elevated TRIB1 mRNA expression, EdU-positive rate, OD450 value, and TRIB1, PCNA, PD-1, and PD-L1 proteins, and reduced apoptosis rate and p53 protein (P<0.05). Compared with the TRIB1-WT + mimic NC group, luciferase activity was decreased in the TRIB1-WT + miR-100-5p mimic group (P<0.05). Conclusions Overexpression of miR-100-5p inhibits proliferation and induces apoptosis of HL-60 cells by downregulating TRIB1.

Graphical abstract

关键词

微小RNA-100-5p / Tribbles同源蛋白1 / 急性髓系白血病 / 增殖 / 凋亡 / HL-60细胞

Key words

MiR-100-5p / Tribbles pseudokinase 1 / Acute myeloid leukemia / Proliferation / Apoptosis / HL-60 cell

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樊小如,杨莹,孙寅,杜聪梅. miR-100-5p对急性髓系白血病细胞增殖及凋亡的影响及其分子机制[J]. 中国当代儿科杂志, 2026, 28(01): 99-106 DOI:10.7499/j.issn.1008-8830.2503192

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急性髓系白血病(acute myeloid leukemia, AML)是一种也可发生于儿童的血液系统肿瘤,具有高度异质性,其特征是未分化髓系原始细胞在骨髓和外周血中积聚,导致细胞无限增殖以及细胞凋亡受到抑制1-3。近年来化疗和其他药物治疗取得了重大进展,在一定程度上改善了AML临床结果,但由于耐药性的快速发展和治疗后的高复发率,AML患儿的长期生存率仍然很低4。因此,探索影响AML细胞增殖、凋亡的分子机制对于AML的治疗意义重大。越来越多的研究表明,微小RNA(microRNA, miR)-100-5p通过抑制蛋白质的翻译或者促进mRNA的降解,来参与多种生理和病理过程5。如过表达miR-100-5p通过靶向哺乳动物雷帕霉素靶蛋白抑制AML细胞增殖6;上调miR-100可抑制儿童急性淋巴细胞白血病细胞增殖并促进细胞凋亡7。但关于miR-100-5p影响AML细胞增殖及凋亡具体分子机制尚不清楚。Tribbles同源蛋白1(Tribbles pseudokinase 1, TRIB1)作为一种假激酶,通过影响蛋白稳定性、细胞周期进程等方式在肿瘤发生、发展中发挥复杂作用8。研究显示,TRIB1过表达通过调节同源框A9基因转录促进AML细胞增殖,抑制细胞凋亡9,且miR-100-5p与TRIB1可结合并影响乳腺癌进展10,但miR-100-5p影响AML细胞增殖及凋亡是否有TRIB1参与尚不清楚。本研究旨在探究miR-100-5p对AML细胞增殖及凋亡的影响及分子机制。

1 材料与方法

1.1 外周血收集及细胞来源

收集2022年6月—2024年6月在滕州市中心人民医院就诊的16例AML(WHO分型M1型2例、M2型6例、M3型4例、M4型2例、M5型2例。未经过任何形式的治疗)患儿的外周血作为AML组,另取同期在本院进行体检的16例健康儿童的外周血作为对照组。收集的外周血标本经离心获得血清后置于-80℃保存。本研究已获得参与者监护人的书面知情同意,并通过本院伦理委员会批准(伦理审批号:2021-0015)。

人源髓系白血病细胞系HL-60购自上海弘顺生物科技有限公司。

1.2 主要试剂

miR-100-5p模拟物(miR-100-5p mimic;序列为5'-AACCCGUAGAUCCGAACUUGUG-3')及模拟物阴性对照(mimic negative control, mimic NC;序列为5'-UUCUCCGAACGUCACGUTT-3')、TRIB1小干扰RNA(small interfering RNA-TRIB1, si-TRIB1;序列为5'-GACTCAGAAATAGGAACTTCA-3')及小干扰RNA阴性对照(small interfering RNA-negative control, si-NC;序列为5'-GACTCAGTTTTACCTTCTTCA-3')由广州基迪奥生物科技有限公司合成,TRIB1过表达(over expression-TRIB1, OE-TRIB1)质粒及其阴性对照(over expression-negative control, OE-NC)质粒由武汉金开瑞生物工程有限公司合成。其余试剂包括PrimeScript RT试剂盒(北京智杰方远科技公司),SYBR Green PCR Master Mix(美国MCE公司),5-乙炔基-2'脱氧尿嘧啶核苷(5-ethynyl-2'-deoxyuridine, EdU)试剂盒(上海东寰生物公司),CCK-8试剂盒(碧云天生物技术有限公司),Annexin V-FITC细胞凋亡检测试剂盒(上海泽叶生物科技公司),兔源一抗TRIB1、增殖细胞核抗原(proliferating cell nuclear antigen, PCNA)、GAPDH、p53、程序性死亡受体-1(programmed cell death protein 1, PD-1)、程序性死亡受体-配体1(programmed death-ligand 1, PD-L1)及二抗(英国Abcam公司)。

1.3 细胞分组

HL-60细胞在含10% FBS的RPMI-1640培养基中,于37℃、5% CO₂条件下悬浮培养。细胞分为空白组、mimic NC组、miR-100-5p mimic组、si-NC组、si-TRIB1组、miR-100-5p mimic+OE-NC组、miR-100-5p mimic+OE-TRIB1组。空白组HL-60细胞正常培养;mimic NC组、miR-100-5p mimic组、si-NC组、si-TRIB1组HL-60细胞分别转染50 nmol/L mimic NC、50 nmol/L miR-100-5p mimic、30 nmol/L si-NC、30 nmol/L si-TRIB1 24 h;miR-100-5p mimic+OE-NC组HL-60细胞转染50 nmol/L miR-100-5p mimic和2 μg/mL pcDNA 24 h;miR-100-5p mimic+OE-TRIB1组HL-60细胞转染50 nmol/L miR-100-5p mimic和2 μg/mL pcDNA-TRIB1 24 h。通过qRT-PCR法检测各转染组HL-60细胞中miR-100-5p及TRIB1 mRNA表达水平,评估是否转染成功。

1.4 外周血及HL-60细胞中miR-100-5p及TRIB1 mRNA表达检测

采用TRIzol试剂裂解外周血样本或细胞,加入氯仿后离心分相;收集上层水相,经异丙醇沉淀RNA、75%乙醇洗涤后,将RNA溶解于去离子水。随后,使用PrimeScript RT试剂盒进行反转录,合成cDNA。最后,采用SYBR Green PCR Master Mix进行qRT-PCR扩增,设置标准程序(95℃预变性,40个循环的95℃变性/60℃退火延伸),并通过熔解曲线验证扩增特异性。通过2-△△Ct法计算miR-100-5p(以U6为内参)的相对表达量及TRIB1 mRNA(以GAPDH为内参)的相对表达量。引物序列为:miR-100-5p正向引物:5'-GTGTTCAAGCCTAGATGCCCAA-3',反向引物:5'-GCATCTAGGCTTGAACACGCC-3';TRIB1正向引物:5'-TTAGTTCCTTCTTCTGCTA-3',反向引物:5'-AGTCATTATCTGGTTGGTA-3';U6正向引物:5'-CTCGCTTCGGCAGCACA-3',反向引物:5'-ACGCTTCACGAATTTGCGT-3';GAPDH正向引物:5'-CATGGCCTTCCGTGTTCCTA-3',反向引物:5'-TACTTGGCAGGTTTCTCCAGG-3'。

1.5 EdU染色检测细胞增殖

各组HL-60细胞以2×104个细胞/孔的密度接种于6孔板,与50 μmol/L EdU溶液共孵育1 h后,加入500 μL 40 g/L多聚甲醛,室温固定20 min。加入0.5% Triton X-100孵育10 min后,用4',6-二氨基-2-苯基吲哚对细胞核进行染色20 min。PBS洗涤3次后,采用倒置荧光显微镜对染色细胞进行成像,并计算EdU阳性率。EdU阳性率(%)=(EdU阳性细胞数/总细胞数)×100%。

1.6 CCK-8检测细胞增殖

HL-60细胞以2×104个细胞/孔的密度接种于96孔板,每孔体积为200 μL。待细胞贴壁后,按1.3所述分组处理后,每孔加入10 μL CCK-8试剂孵育2 h,于450 nm波长检测光密度(optical density, OD)值。OD450值越大,表明细胞增殖能力越强。

1.7 细胞凋亡率检测

HL-60细胞以6×105个细胞/孔的密度接种于12孔板,培养12~16 h,待细胞进入对数生长期并适应环境后收集,PBS洗涤2次。重悬细胞于100 μL 1×Binding Buffer,加入5 μL Annexin V-FITC和5 μL PI(50 μg/mL),室温避光孵育15 min。随后加入400 μL Binding Buffer混匀,立即上机行流式细胞术检测,计算细胞凋亡率。凋亡率(%)=[Annexin V⁺PI⁻(早期凋亡)细胞数+Annexin V⁺PI⁺(晚期凋亡/坏死)细胞数]/总细胞数×100%。

1.8 Western blot检测TRIB1、PCNA、p53、PD-1、PD-L1蛋白表达

采用RIPA裂解缓冲液提取各组HL-60细胞总蛋白,通过BCA试剂盒测定蛋白浓度。取等量蛋白样品(30 μg)行12% SDS-PAGE分离,转至PVDF膜。随后,将膜在含5%脱脂牛奶的PBS中封闭1 h,分别与一抗TRIB1(1∶3 000)、PCNA(1∶2 000)、p53(1∶4 000)、PD-1(1∶3 000)、PD-L1(1∶2 000)、GAPDH(1∶5 000)于4℃孵育过夜。次日经二抗(1∶5 000)孵育1 h后。用ECL试剂盒显影。采用Image J软件分析蛋白条带灰度值。蛋白相对表达量=目标蛋白灰度值/GAPDH灰度值。

1.9 双萤光素酶报告基因实验

通过miRNA靶点预测工具starbase网站(https://starbase.sysu.edu.cn)鉴定miR-100-5p在TRIB1 3'UTR区的结合位点,设计TRIB1野生型(TRIB1-WT)序列和TRIB1突变型(TRIB1-MUT)序列,克隆至pGL3-Basic载体的萤光素酶基因下游,通过酶切鉴定载体构建成功。将构建成功的双萤光素酶报告基因载体分别与50 nmol/L miR-100-5p mimic(TRIB1-WT+miR-100-5p mimic组、TRIB1-MUT+miR-100-5p mimic组)或50 nmol/L mimic NC(TRIB1-WT+mimic NC组、TRIB1-MUT+mimic NC组)共转染至HL-60细胞,转染24 h后弃去培养基,每孔加入100 μL 1×Passive Lysis Buffer,室温裂解15 min。取20 μL裂解液,使用双萤光素酶报告基因检测系统进行检测:先加入100 μL Luciferase Assay Reagent Ⅱ检测萤火虫萤光素酶活性并记录数据,再加入100 μL Stop & Glo® Reagent淬灭并检测海肾萤光素酶活性。最后计算萤火虫萤光素酶/海肾萤光素酶萤光值比值。

1.10 统计学分析

采用GraphPad Prism 8软件对数据进行统计学分析。符合正态分布的计量资料以均数±标准差(x¯±s)表示。两组间比较采用两样本t检验;多组间比较采用单因素方差分析,组间两两比较采用SNK-q检验。P<0.05为差异有统计学意义。

2 结果

2.1 健康儿童、AML患儿miR-100-5p及TRIB1 mRNA表达比较

与对照组比较,AML组患儿外周血中miR-100-5p表达降低(分别为0.23±0.04、1.00±0.00;t=77.000,P<0.001),TRIB1 mRNA表达升高(分别为1.75±0.19、1.00±0.00;t=15.789,P<0.001)。

2.2 上调miR-100-5p或沉默TRIB1对HL-60细胞miR-100-5p及TRIB1 mRNA表达的影响

与空白组、mimic NC组比较,miR-100-5p mimic组miR-100-5p表达升高,TRIB1 mRNA表达降低(P<0.05);与空白组、si-NC组比较,si-TRIB1组TRIB1 mRNA表达降低(P<0.05);与miR-100-5p mimic组、miR-100-5p mimic+OE-NC组比较,miR-100-5p mimic+OE-TRIB1组TRIB1 mRNA表达升高(P<0.05)。见表1

2.3 上调miR-100-5p或沉默TRIB1对HL-60细胞增殖的影响

miR-100-5p mimic组EdU阳性率、OD450值低于mimic NC组和空白组(P<0.05);si-TRIB1组EdU阳性率、OD450值低于si-NC组和空白组(P<0.05);与miR-100-5p mimic组、miR-100-5p mimic+OE-NC组比较,miR-100-5p mimic+OE-TRIB1组HL-60细胞EdU阳性率、OD450值升高(P<0.05)。见表2图1

2.4 上调miR-100-5p或沉默TRIB1对HL-60细胞凋亡的影响

miR-100-5p mimic组(30.0%±1.6%)细胞凋亡率高于mimic NC组(8.0%±0.5%)和空白组(8.0%±0.4%)(P<0.05);si-TRIB1组(32.3%±1.8%)细胞凋亡率高于si-NC组(7.9%±0.5%)和空白组(P<0.05);与miR-100-5p mimic组、miR-100-5p mimic+OE-NC组(28.8%±1.5%)比较,miR-100-5p mimic+OE-TRIB1组(15.6%±0.9%)细胞凋亡率降低(P<0.05);7组细胞凋亡率比较差异有统计学意义(F=566.100,P<0.001)。见图2

2.5 上调miR-100-5p或沉默TRIB1对HL-60细胞中TRIB1、PCNA、p53、PD-1、PD-L1蛋白表达的影响

与空白组、mimic NC组比较,miR-100-5p mimic组HL-60细胞中TRIB1、PCNA、PD-1、PD-L1蛋白表达降低,p53蛋白表达升高(P<0.05);与空白组、si-NC组比较,si-TRIB1组HL-60细胞中TRIB1、PCNA、PD-1、PD-L1蛋白表达降低,p53蛋白表达升高(P<0.05);与miR-100-5p mimic组、miR-100-5p mimic+OE-NC组比较,miR-100-5p mimic+OE-TRIB1组HL-60细胞中TRIB1、PCNA、PD-1、PD-L1蛋白表达升高,p53蛋白表达降低(P<0.05),见表3图3

2.6 miR-100-5p靶向调控TRIB1验证

TRIB1与miR-100-5p可结合,见图4。TRIB1-WT+miR-100-5p mimic组萤光素酶活性低于TRIB1-WT+mimic NC组(分别0.336±0.062、1.011±0.032;t=23.698,P<0.001);与TRIB1-MUT+mimic NC组(0.989±0.034)比较,TRIB1-MUT+miR-100-5p mimic组(0.992±0.028)萤光素酶活性差异无统计学意义(t=0.167,P=0.871)。

3 讨论

AML是由于未成熟髓系细胞的异常增殖和细胞凋亡受损,导致造血系统受到抑制所致11。目前,AML的主要治疗方法还不能明显改善AML患儿预后12。因此,深入探究调控AML细胞增殖与凋亡的分子机制具有重要意义。

miRNA在进化上具有保守性,其异常表达存在于AML等多种恶性肿瘤中,并可影响肿瘤细胞的生物学行为13。miR-100-5p作为miR-100家族的重要成员在进化上高度保守,其在多种肿瘤中存在异常表达,且可调控肿瘤细胞生物学行为14。例如,过表达miR-100-5p可抑制甲状腺癌细胞增殖并诱导细胞凋亡15;过表达miR-100-5p可在体外和体内抑制脊索瘤生长16;miR-100上调可抑制急性淋巴细胞白血病细胞增殖17。本研究检测了健康儿童及AML患儿外周血中miR-100-5p表达水平,结果显示,与对照组比较,AML组患儿外周血miR-100-5p表达降低,提示其在AML组患儿体内呈异常下调状态,且可能与AML患儿预后不良相关,有待大样本临床研究进一步验证。以人髓系白血病细胞系HL-60为研究对象进行过表达转染实验,结果表明,上调miR-100-5p表达可抑制HL-60细胞增殖并诱导凋亡。此外,PCNA可环绕DNA并固定DNA聚合酶以维持DNA持续合成,进而增强细胞增殖能力18;p53作为序列特异性转录因子,其表达上调可触发细胞凋亡19。本研究发现,与空白组、mimic NC组比较,miR-100-5p mimic组HL-60细胞中PCNA蛋白表达降低,p53蛋白表达升高。提示miR-100-5p有望成为AML干预的潜在有效靶点。

miRNA可通过直接靶向mRNA的3'-非翻译区下调基因表达,并破坏mRNA稳定性20-21。为进一步探究过表达miR-100-5p抑制HL-60细胞增殖并诱导细胞凋亡的分子机制,本研究证实TRIB1为miR-100-5p的靶基因。TRIB1作为致癌基因,在多种恶性肿瘤中高表达并推动肿瘤恶性进展22。例如,在唐氏综合征Ts1Cje小鼠模型中,TRIB1过表达可促进AML发生发展23;敲低TRIB1能抑制视网膜母细胞瘤细胞增殖和克隆形成,并促进细胞凋亡24。本研究结果显示,AML患儿外周血中TRIB1 mRNA呈高表达状态;敲低TRIB1后,HL-60细胞增殖能力减弱,凋亡能力增强;且过表达miR-100-5p可下调HL-60细胞中TRIB1 mRNA及蛋白表达。据此推测,上调miR-100-5p可能通过下调TRIB1表达抑制HL-60细胞增殖,促进细胞凋亡。为验证该推测,本研究进一步实验结果显示,过表达TRIB1逆转了过表达miR-100-5p对HL-60细胞增殖及凋亡的影响,证实上调miR-100-5p可能通过降低TRIB1表达抑制HL-60细胞增殖,促进细胞凋亡。此外,PD-1作为重要免疫抑制分子,可通过与PD-L1相互作用促进肿瘤相关巨噬细胞和其他免疫细胞极化为促肿瘤表型,促进肿瘤细胞免疫逃逸和癌症进展25;已有研究表明,TRIB1缺失可进一步增强慢性淋巴细胞性脉络丛脑膜炎病毒感染小鼠中PD-1通路阻断效果26。本研究中各组HL-60细胞PD-1、PD-L1蛋白表达变化说明上调miR-100-5p通过下调TRIB1抑制HL-60细胞增殖,促进细胞凋亡的机制可能与PD-1、PD-L1有关。另有研究报道,TRIB1可通过调控MEK1/ERK通路参与髓系白血病发生发展27,提示上调miR-100-5p可能通过调控TRIB1-MEK1/ERK通路发挥上述作用,后续需设计实验验证具体机制。

综上所述,上调miR-100-5p可通过下调TRIB1表达抑制HL-60细胞增殖,促进细胞凋亡,本研究为AML治疗提供了潜在新靶点。但本研究存在一定局限性:其一,尽管观察到AML患儿中miR-100-5p低表达和TRIB1高表达的显著趋势,但尚未系统分析两者表达水平与临床预后指标及治疗反应的相关性;其二,研究所用HL-60细胞系源自成人AML-M2/M3患者,而临床样本来自儿童AML(涵盖M1-M5亚型)。尽管HL-60细胞广泛用于AML机制研究,但其成人来源、特定分子特征及M2/M3亚型背景,可能与儿童AML生物学特性存在差异,这可能影响miR-100-5p/TRIB1通路的调控机制的适用性。未来研究需在更多儿童AML原代细胞或代表性细胞模型中验证本研究发现,以增强结论的说服力。

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基金资助

山东省医药卫生科技发展计划项目(202006010355)

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