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1.陆军军医大学(第三军医大学):,基础医学院免疫学教研室
2.实验动物学教研室
3.药学与检验医学系药物分析学教研室,重庆
王 莉,E-mail: liwang118@ tmmu.edu.cn
吴玉章,E-mail: wuyuzhang@iiicq.vip
收稿日期:2025-07-08,
修回日期:2025-09-02,
录用日期:2025-09-02,
纸质出版日期:2025-09-30
移动端阅览
刘东,赵清远,杨数数,等.Gm49394对胰岛β细胞凋亡的调控及机制研究[J].陆军军医大学学报,2025,47(18):2211-2222.DOI:10.16016/j.2097-0927.202507031.
LIU DONG,ZHAO QINGYUAN,YANG SHUSHU,et al.Regulation and mechanism of Gm49394 on islet-β cell apoptosis[J].J Army Med Univ,2025,47(18):2211-2222.DOI:10.16016/j.2097-0927.202507031.
目的
2
研究功能未知基因
Gm49394
参与糖尿病背景下胰岛β细胞凋亡的调控及可能机制。
方法
2
通过RNA荧光原位杂交技术(RNA fluorescence in situ hybridization, RNA-FISH)、Western blot、免疫荧光染色(immunofluorescence, IF)、实时荧光定量PCR(quantitative real-time PCR,qPCR)检测
Gm49394
在胰岛β细胞系(NIT-1和Min6)及非胰岛β细胞系(293T、3T3L1、B16、LS174T)的表达及翻译活性;通过构建过表达/敲低稳转细胞株(NIT-1/Min6),在稳态以及葡萄糖(30 mmol/L)、单独IFN-γ(10 ng/mL)或联合IL-6(10 ng/mL)、H
2
O
2
(100 μmol/L)等病理应激条件下,采用流式细胞术和Western blot检测β细胞增殖、凋亡、线粒体功能,及氧化应激和内质网应激标志。
结果
2
RNA-FISH和qPCR结果显示基因
Gm49394
在胰岛β细胞系中特异性表达,并受高糖或炎症因子刺激而上调;IF及Western blot结果显示
Gm49394
具有蛋白编码活性;流式细胞术和Western blot结果显示
Gm49394
过表达不影响β细胞增殖,但显著促进稳态和病理应激条件下的β细胞凋亡,并增加活性氧(reactive oxygen species, ROS)及线粒体超氧化物(mitochondrial superoxide, MitoSOX)水平(
P
<
0.05);稳态条件下,
Gm49394
敲低对β细胞增殖、凋亡、ROS及MitoSOX均无显著影响,但
Gm49394
敲低能显著抑制病理应激条件下的β细胞凋亡,同时显著抑制氧化应激和内质网应激(
P
<
0.05)。
结论
2
基因
Gm49394
可能通过氧化应激和内质网应激促进胰岛β细胞的凋亡。
Objective
2
To explore the potential role and underlying mechanism of the functionally uncharacterized gene
Gm49394
on regulating β-cell apoptosis under diabetic conditions.
Methods
2
The expression and translational activity of
Gm49394
in pancreatic β-cell lines and non-β-cell lines were validated using RNA fluorescence
in situ
hybridization (RNA-FISH)
quantitative real-time PCR (qPCR)
Western blotting
and immunofluorescence (IF) assay. The β-cell lines (NIT-1/Min6) with
Gm49394
overexpression or knockdown were constructed. The proliferation
apoptosis
mitochondrial function
as well as oxidative stress and endoplasmic reticulum stress markers in these β-cell lines under physiological homeostasis or pathological stress conditions
such as high glucose (30 mmol/L)
inflammation (10 ng/mL IFN-γ alone or combined with 10 ng/mL IL-6)
and hydrogen peroxide (100 μmol/L H
2
O
2
) were detected by flow cytometry and Western blotting.
Results
2
RNA-FISH and qPCR indicated that
Gm49394
was specifically expressed in pancreatic β-cell lines and up-regulated under high glucose or inflammatory stimulation. IF assay and Western blotting showed that
Gm49394
had protein-coding activity. Flow cytometry and Western blotting identified that
Gm49394
overexpression did not affect β-cell proliferation
but promoted β-cell apoptosis and increased reactive oxygen species (ROS) and mitochondrial superoxide (MitoSOX) levels in β cells under physiological homeostasis or pathological stress conditions (
P
<
0.05). Under physiological conditions
Gm49394
knockdown failed to induce significant alterations on β-cell apoptosis
ROS
or MitoSOX levels. Under pathological stress conditions
Gm49394
knockdown significantly suppressed β-cell proliferation
apoptosis
as well as oxidative and endoplasmic reticulum stress (
P
<
0.05).
Conclusion
2
Gm49394
may promote β-cell apoptosis
via
oxidative stress and endoplasmic reticulum stress.
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