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1.河北工程大学 临床医学院,河北邯郸
4.河北工程大学医学院河北邯郸
2.河北工程大学 老年病科,河北邯郸
3.河北工程大学胃肠外科,河北邯郸
付泽娴,E-mail:fuzexian@hebeu.edu.cn
收稿:2025-11-05,
修回:2026-01-12,
录用:2026-01-14,
纸质出版:2026-02-15
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任行,白净,叶学帅,等.自体粪菌移植通过重塑菌群抑制NF-κB通路并调节CD8⁺ T/Treg平衡抑制小鼠结肠炎相关性结肠癌[J].陆军军医大学学报,2026,48(03):294-304.DOI:10.16016/j.2097-0927.202511026.
REN H,BAI J,YE X S,et al.Autologous fecal microbiota transplantation attenuates colitis-associated carcinogenesis in mice by suppressing NF-κB signaling and restoring CD8⁺ T cell/regulatory T cell balance[J].J Army Med Univ,2026,48(03):294-304.DOI:10.16016/j.2097-0927.202511026.
任行,白净,叶学帅,等.自体粪菌移植通过重塑菌群抑制NF-κB通路并调节CD8⁺ T/Treg平衡抑制小鼠结肠炎相关性结肠癌[J].陆军军医大学学报,2026,48(03):294-304.DOI:10.16016/j.2097-0927.202511026. DOI:
REN H,BAI J,YE X S,et al.Autologous fecal microbiota transplantation attenuates colitis-associated carcinogenesis in mice by suppressing NF-κB signaling and restoring CD8⁺ T cell/regulatory T cell balance[J].J Army Med Univ,2026,48(03):294-304.DOI:10.16016/j.2097-0927.202511026. DOI:
目的
2
探讨自体粪菌移植(autologous fecal microbiota transplantation,AFMT)通过调节核因子κB(nuclear factor kappa-B,NF-κB)信号通路对氧化偶氮甲烷(azoxymethane,AOM)/葡聚糖硫酸钠(dextran sulfate sodium salt,DSS)诱导的结肠炎相关性结肠癌(colitis-associated colorectal cancer,CAC)模型小鼠免疫功能及肿瘤抑制作用的影响。
方法
2
将6周龄(specific pathogen free,SPF)级BALB/c雌性小鼠[体质量(20±2)g]按照随机数字表法分为3组(
n
=5):空白对照组(Con组)、CAC模型组(Mod组)和AFMT干预组(AFMT组)。采用单次腹腔注射AOM(10 mg/kg)并联合3轮DSS循环处理(3.5%DSS自由饮用7 d和纯净水恢复14 d)建立CAC模型;AFMT组于建模后第7天起隔日灌胃0.1 mL自体粪菌悬液,直至实验结束;其余组灌胃等量无菌生理盐水。实验结束后采集结直肠、脾脏、血清及粪便样本,通过HE染色评估结肠组织病理损伤及炎症细胞浸润程度。Western blot检测结肠组织中NF-κB p65和p-NF-κB p65蛋白表达;ELISA检测各组小鼠血清肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)水平;流式细胞术分析脾脏中CD8⁺ T和Treg(CD4
+
CD25
+
Foxp3
+
)的细胞比例,16S rRNA测序分析肠道菌群组成、α多样性与β多样性。
结果
2
与Con组比较,Mod组结肠HE染色显示杯状细胞减少,炎性细胞浸润明显,小鼠结肠组织中p-NF-κB p65与NF-κB p65的比例上升(
P
<
0.05),血清中TNF-α炎症因子水平升高(
P
<
0.001),脾脏组织中CD8
+
T细胞比例下降(
P
<
0.001),Treg细胞比例升高(
P
<
0.05),拟杆菌目(
Bacteroidales
)的相对丰度升高(
P
<
0.05),乳杆菌目(
Lactobacillales
)相对丰度下降(
P
<
0.05)。与Mod组相比,AFMT组结肠组织结构损伤较轻,炎性细胞浸润减少,结肠组织中p-NF-κB p65与NF-κB p65的比值下降(
P
<
0.01),TNF-α炎症因子水平下降(
P
<
0.01),CD8
+
T细胞比例升高(
P
<
0.05),Treg细胞比例降低(
P
<
0.05),
Bacteroidales
的相对丰度下降(
P
<
0.05),
Lactobacillales
相对丰度升高(
P
<
0.05)。
结论
2
AFMT干预后可能通过恢复
Lactobacillales
的丰度,增强肠道屏障/产生短链脂肪酸,抑制NF-κB炎症通路、降低TNF-α水平、调节T细胞免疫平衡,有效缓解CAC模型小鼠的疾病进展。
Objective
2
To investigate the effects of autologous fecal microbiota transplantation (AFMT) on immune regulation and tumor suppression in a murine model of colitis-associated colorectal cancer (CAC) induced by azoxymethane (AOM)/dextran sulfate sodium (DSS)
with mechanistic emphasis on NF-κB pathway inhibition and CD8⁺ T cell/regulatory T cell (Treg) balance modulation.
Methods
2
Six-week-old female BALB/c mice [SPF grade
body weight (20±2) g
]
were randomly divided into 3 groups (
n
=5 per group): control group (Con)
CAC model group (Mod)
and AFMT intervention group (AFMT). The CAC model was established by a single intraperitoneal injection of AOM (10 mg/kg) followed by three cycles of DSS treatment (each cycle: 3.5%DSS in drinking water for 7 d plus 14 d of recovery with sterile water). Starting from day 7 post-modeling
the AFMT group received 0.1 mL of autologous fecal microbiota suspension
via
oral gavage every other day until the end of the experiment; control groups received equal volumes of sterile saline. At endpoint
colorectal tissues
spleen
serum
and fecal samples were collected. Colonic pathological injury and inflammatory cell infiltration were assessed by hematoxylin-eosin (HE) staining. NF-κB p65 and p-NF-κB p65 protein expression in colon tissue was detected by Western blot. Serum TNF-α levels were measured by ELISA.
Flow cytometry was used to analyze the proportions of CD8
+
T cells and regulatory T cells (Treg
defined as CD4
+
CD25
+
Foxp3
+
) in the spleen. Gut microbiota composition and diversity (α- and β-diversity) were analyzed by 16S rRNA sequencing.
Results
2
Compared with the Con group
the Mod group showed a reduction in goblet cells and significant inflammatory cell infiltration in HE-stained colon sections
an increased ratio of p-NF-κB p65 to NF-κB p65 in colon tissue (
P
<
0.05)
elevated serum TNF-α levels (
P
<
0.001)
a decreased proportion of CD8⁺ T cells in the spleen (
P
<
0.001)
an increased proportion of Treg cells (
P
<
0.05)
an increased relative abundance of
Bacteroidales
(
P
<
0.05)
and a decreased relative abundance of
Lactobacillales
(
P
<
0.05). Compared with the Mod group
the AFMT group showed milder structural damage and reduced inflammatory cell infiltration in the colon
a decreased ratio of p-NF-κB p65 to NF-κB p65 in colon tissue (
P
<
0.01)
reduced serum TNF-α levels (
P
<
0.01)
an increased proportion of CD8⁺ T cells in the spleen (
P
<
0.05)
a decreased proportion of Treg cells (
P
<
0.05)
a decreased relative abundance of
Bacteroidales
(
P
<
0.05)
and an increased relative abundance of
Lactobacillales
(
P
<
0.05).
Conclusion
2
AFMT intervention may alleviate disease progression in CAC model mice through multiple mechanisms: restoring the abundance of
Lactobacillales
enhancing the intestinal barrier function and promoting short-chain fatty acid production
inhibiting the NF-κB inflammatory pathway
reducing TNF-α levels
and regulating T-cell immune balance.
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