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1.潍坊医学院医学检验学院,潍坊 261000
2.山东大学齐鲁医学院,济南 250000
3.山东第一医科大学第一附属医院/ 山东省千佛山医院检验医学,山东省医药卫生临床检验诊断学重点实验室,济南 250000
叶棣文,Email:ydw123@outlook.com,研究方向:临床检验诊断学。
逯素梅,Email:lsmqianyi@126.com。
收稿:2023-09-26,
修回:2023-12-13,
录用:2023-12-15,
纸质出版:2024-02-28
移动端阅览
叶棣文,张炳杨,张丹彤,等.RNA m6A甲基化修饰在脂肪细胞胰岛素抵抗中的作用机制[J].重庆医科大学学报,2024,49(2):132-140.
Ye Diwen,Zhang Bingyang,Zhang Dantong,et al.The role of RNA m6A methylation in insulin resistance in adipocytes[J].Journal of Chongqing Medical University,2024,49(2):132-140.
叶棣文,张炳杨,张丹彤,等.RNA m6A甲基化修饰在脂肪细胞胰岛素抵抗中的作用机制[J].重庆医科大学学报,2024,49(2):132-140. DOI: 10.13406/j.cnki.cyxb.003432.
Ye Diwen,Zhang Bingyang,Zhang Dantong,et al.The role of RNA m6A methylation in insulin resistance in adipocytes[J].Journal of Chongqing Medical University,2024,49(2):132-140. DOI: 10.13406/j.cnki.cyxb.003432.
目的
2
探讨RNA m
6
A甲基化修饰在脂肪细胞胰岛素抵抗中的
作用及机制。
方法
2
收集2型糖尿病患者术中赘余皮下脂肪组织,以非2型糖尿病患者同样组织为对照,检测组间RNA m
6
A水平。高脂饮食诱导C57BL/6J小鼠构建胰岛素抵抗(insulin resistance,IR)模型(HFD组,
n
=5,60%高脂饲料喂养16周),对照组10%低脂饲料喂养16周(CD组,
n
=5)。模型构建成功后,取附睾周围脂肪组织行表观转录组学m
6
A甲基化修饰芯片检测,并借助MeRIP-qPCR实验、RT-qPCR以及RNA结合蛋白免疫沉淀测定(RNA Binding Protein Immunoprecipitation Assay,RIP)实验验证胰岛素信号转导相关基因变化;进一步观察METTL3小分子抑制剂STM2457对高脂饮食诱导下小鼠胰岛素信号转导基因的影响。
结果
2
2型糖尿病患者和小鼠IR模型脂肪组织中总体m
6
A修饰水平均升高(患者200 ng RNA
t
=-8.375,
P
<
0.001;患者100 ng RNA
t
=-3.722,
P
=0.006;患者50 ng RNA
t
=-4.937;
P
=0.001;小鼠100 ng RNA
t
=-3.590,
P
=0.023;小鼠50 ng RNA
t
=-2.760,
P
=0.025)。表观转录组学检测证实IR的脂肪组织中1 175个基因发生高m
6
A修饰,55个基因发生低m
6
A修饰,同时有182个基因呈现高m
6
A修饰且低表达,包括
AKT2、INSR、PIK3R1、ACACA、SREBF1
等5个胰岛素信号转导关键基因,其中
AKT2、INSR、ACACA、SREBF1
等4个基因被确证并证实其与METTL3存在直接结合,其m
6
A修饰水平受METTL3正向调控。STM2457作用下,胰岛素敏感性提高,且
AKT2、INSR、ACACA、SREBF1
转录水平上调,提示IR表型改善明显。
结论
2
高脂饮食通过METTL3诱导脂肪细胞胰岛素信号转导基因
AKT2、INSR、ACACA、SREBF1
发生m
6
A高甲基化修饰,诱导其低表达,阻滞胰岛素信号转导,进而参与诱发IR。
Objective
2
To explore the role of RNA m
6
A methylation in insulin resistance in adipocytes.
Methods
2
We collected redundant subcutaneous adipose tissue samples from patients with type 2 diabetes and patients without type 2 diabetes to measure the RNA m
6
A modification level. A insulin resistance(IR) model was established by feeding C57BL/6J mice with a 60% high-fat diet for 16 weeks(
n
=5),while the control group was fed with a 10% low-fat diet for 16 weeks(
n
=5). After successful modeling,the adipose tissue around the epididymis was
taken to detect m
6
A methylation using epitranscriptomic microarrays. The changes in insulin signaling-related genes were determined by MeRIP-qPCR assay,RT-qPCR,and RIP assay. The effects of the small-molecule inhibitor STM2457 targeting methyltransferase like 3(METTL3) on insulin signaling-related genes in mice feeding a high-fat diet were investigated.
Results
2
The overall m
6
A modification levels were significantly increased in the adipose tissue of patients with type 2 diabetes and IR mice(patients 200 ng RNA,
t
=-8.375,
P
<
0.001;patients 100 ng RNA,
t
=-3.722,
P
=0.006;patients 50 ng RNA,
t
=-4.937,
P
=0.001;mice 100 ng RNA,
t
=-3.590,
P
=0.023;mice 50 ng RNA,
t
=-2.760,
P
=0.025). The epitranscriptomic assay detected high m
6
A methylation levels in 1 175 genes and low m
6
A methylation levels in 55 genes;182 genes showed significantly high m
6
A modification and low expression,including five key insulin signaling-related genes(
AKT2
,
INSR
,
PIK3R1
,
ACACA
,and
SREBF1
). Direct binding between
AKT2
,
INSR
,
ACACA
,and
SREBF1
and METTL3 was validated,and their m
6
A modification levels were positively regulated by METTL3. STM2457 significantly increased insulin sensitivity,and significantly upregulated the transcriptional levels of
AKT2
,
INSR
,
ACACA
,and
SREBF1
,suggesting a significant improvement in IR phenotype.
Conclusion
2
High-fat diet induces IR through METTL3,which mediates m
6
A hypermethylation of
AKT2
,
INSR
,
ACACA
,and
SREBF1
to downregulate their expression an
d block insulin signaling in adipocytes.
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