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1.信阳职业技术学院:,医学院,河南信阳
2.信阳职业技术学院:,药学院,河南信阳
3.信阳市中医院病理科,河南信阳
张 敏,E-mail:470361625@qq.com
收稿日期:2025-04-18,
修回日期:2025-06-20,
纸质出版日期:2025-07-15
移动端阅览
张敏,李敏,肖猛,等.miR-543/SNTB1轴调控结直肠癌免疫微环境[J].陆军军医大学学报,2025,47(13):1484-1493.DOI:10.16016/j.2097-0927.202504078.
ZHANG M,LI M,XIAO M,et al.MiR-543/SNTB1 axis modulates immune microenvironment in colorectal cancer[J].J Army Med Univ,2025,47(13):1484-1493.DOI:10.16016/j.2097-0927.202504078.
目的
2
探讨miR-543/互养蛋白β1(syntrophin beta 1,SNTB1)轴在结直肠癌(colorectal cancer,CRC)中的临床意义及其对免疫微环境的影响。
方法
2
收集癌症基因组图谱(the Cancer Genome Atlas,TCGA)、基因型组织表达(Genotype-Tissue Ex
pression,GTEx)、人类蛋白质图谱(Human Protein Atlas,HPA)等公开数据对CRC组织中
SNTB1
的表达进行分析,并通过Kaplan-Meier生存分析、单因素Cox回归分析及相关性分析评估
SNTB1
在CRC患者中的预后价值及其与免疫微环境的关系。在线数据库结合CRC细胞HT-29荧光活性实验检测miR-543与SNTB1的靶向关系。CRC细胞HT-29经过相应处理后(转染si-SNTB1、miR-543 mimics或/和
SNTB1
过表达质粒)与CD8
+
T细胞构建体外共培养体系,分别采用RT-qPCR、Western blot、流式细胞术、ELISA以及乳酸脱氢酶(lactate dehydrogenase,LDH)释放实验检测
miR-543
、
SNTB1
的表达以及CD8
+
T细胞的活性及细胞毒性。
结果
2
对公共数据库的分析显示
SNTB1
在CRC中的表达显著高于正常组织(
P
<
0.001);相较于
SNTB1
低表达组,
SNTB1
高表达的患者预后较差(
P
<
0.05)。SNTB1高表达与CRC肿瘤微环境免疫评分以及CD8
+
T细胞等免疫细胞的浸润呈负相关关系(
P
<
0.05),且在HT-29细胞中敲减
SNTB1
可增强CD8
+
T细胞的杀伤力(
P
<
0.01)。在线数据库结合细胞实验证实了miR-543和SNTB1的靶向结合关系,同时miR-543在CRC中表达降低(
P
<
0.001)。转染miR-543 mimic可抑制HT-29细胞中SNTB1的表达(
P
<
0.001),而过表达
SNTB1
可逆转miR-543 mimic对CD8
+
T细胞体外杀伤能力的促进效应(
P
<
0.05)。
结论
2
miR-543可通过与SNTB1的靶向结合促进CD8
+
T细胞的活化并增强其对HT-29细胞的杀伤力。
Objective To investigate the clinical significance of the miR-543/syntrophin beta 1 (SNTB1) axis in colorectal cancer (CRC) and its influence on the tumor immune microenvironment. Methods The expression of
SNTB1
in CRC tissues was analyzed using public data
such as
The Cancer Genome Atlas (TCGA)
Genotype-Tissue Expression (GTEx)
and Human Protein Atlas (HPA). Then Kaplan-Meier survival analysis
univariate Cox regression analysis and correlation analysis were performed to evaluate the prognostic value of
SNTB1
and its relationship with immune microenvironment in CRC. The targeting relationship between
miR-543
and
SNTB1
was confirmed through online databases and fluorescence assay
s in HT-29 cells. For
in vitro
experiments
after transfecting si-SNTB1
miR-543 mimics and/or
SNTB1
overexpression plasmids
HT-29 cells were co-cultured with CD8
+
T cells
the expression of miR543 and
SNTB1
and the viability and cytotoxicity of CD8
+
T cells were assessed with qRT-PCR
Western blotting
flow cytometry
ELISA
and lactate dehydrogenase (LDH) release assay. Results Analysis of public databases revealed significantly higher expression of
SNTB1
in CRC tissues than normal tissues (
P
<
0.001). The CRC patients with high
SNTB1
expression exhibited poorer prognosis when compared with those with low expression level (
P
<
0.05). Moreover
high
SNTB1
expression was negatively correlated with immune scores in the tumor microenvironment and immune cell infiltration
especially CD8
+
T cells (
P
<
0.05). Furthermore
Knockdown of
SNTB1
in HT-29 cells enhanced the cytotoxic activity of CD8
+
T cells (
P
<
0.01). Online database and
in vitro
experiments confirmed that miR-543 targets
SNTB1
while the expression of miR-543 was decreased in colorectal cancer (
P
<
0.001). Transfection with the miR-543 mimic inhibited the expression of
SNTB1
in HT-29 cells (
P
<
0.001)
while overexpressing
SNTB1
counteracted the promotion effect of miR-543 mimics on CD8
+
T cell-mediated cytotoxicity (
P
<
0.05). Conclusion MiR-543 activates CD8
+
T cells and enhances their cytotoxicity against HT-29 cells by directly targeting SNTB1.
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