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1.河南中医药大学 第二临床医学院,郑州 450046
2.河南中医药大学 管理学院,郑州 450046
Received:13 March 2025,
Revised:2025-04-22,
Accepted:08 May 2025,
Online First:21 May 2025,
Published:05 June 2026
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吕腾飞,王景瑀,谢明月等.基于16S rDNA技术和TLRs/MyD88/NF-κB信号通路探讨参苓白术散抗腹泻型肠易激综合征大鼠的分子机制[J].中国实验方剂学杂志,2026,32(11):13-22.
LYU Tengfei,WANG Jingyu,XIE Mingyue,et al.Based on 16S rDNA Technology and TLRs/MyD88/NF-κB Signaling Pathway, Molecular Mechanism of Shenling Baizhusan Resistance to Diarrhea Irritable Bowel Syndrome Rats Was Investigated[J].Chinese Journal of Experimental Traditional Medical Formulae,2026,32(11):13-22.
吕腾飞,王景瑀,谢明月等.基于16S rDNA技术和TLRs/MyD88/NF-κB信号通路探讨参苓白术散抗腹泻型肠易激综合征大鼠的分子机制[J].中国实验方剂学杂志,2026,32(11):13-22. DOI: 10.13422/j.cnki.syfjx.20250612.
LYU Tengfei,WANG Jingyu,XIE Mingyue,et al.Based on 16S rDNA Technology and TLRs/MyD88/NF-κB Signaling Pathway, Molecular Mechanism of Shenling Baizhusan Resistance to Diarrhea Irritable Bowel Syndrome Rats Was Investigated[J].Chinese Journal of Experimental Traditional Medical Formulae,2026,32(11):13-22. DOI: 10.13422/j.cnki.syfjx.20250612.
目的
2
基于16S rDNA技术和分子生物学手段探讨参苓白术散治疗腹泻型肠易激综合征(IBS-D)的分子机制。
方法
2
42只SPF级SD大鼠中随机分为空白组,参苓白术散高(SLBZS-H)、中(SLBZS-M)、低(SLBZS-L)剂量组,匹维溴铵组和模型组,每组7只。采用冰冷番泻叶(0.45 g∙mL
-1
)灌胃(10 mL∙kg
-1
)联合束缚应激方法制备IBS-D大鼠模型,连续14 d。造模成功后以10 mL∙kg
-1
的灌胃体积给予各组相应药物:匹维溴铵组灌胃匹维溴铵(2.0 g∙L
-1
)、SLBZS-H、SLBZS-M、SLBZS-L组分别灌胃2.36、1.18、0.59 g∙mL
-1
的参苓白术散药液,正常组和模型组灌胃同体积生理盐水,连续14 d。观察并记录大鼠一般情况:体质量、粪便、精神状态和死亡等情况。并在造模前(第1天)、造模后(第14天)和治疗后(第28天)检测各组大鼠体质量、腹壁回缩反射评分(AWR)和稀便率;苏木素-伊红(HE)对实验动物结肠组织的形态学特征进行显微观察;酶联免疫吸附测定法(ELISA)定量分析各组5-羟色胺(5-HT)、白细胞介素-6(IL-6)、白细胞介素-1
β
(IL-1
β
)及肿瘤坏死因子-
α
(TNF-
α
)的浓度变化;蛋白免疫印迹法(Western blot)检测大鼠结肠组织中Toll样受体4(TLR4)、Toll样受体2(TLR2)、髓样分化因子88(MyD88)及核转录因子-
κ
B(NF-
κ
B)信号通路关键蛋白的表达水平;16S rDNA技术检测大鼠肠道菌群结构变化。
结果
2
与空白组比较,模型组大鼠结肠部分黏膜上皮脱落和炎性细胞浸润;血清中TNF-
α
、IL-1
β
、IL-6和5-HT含量明显升高(
P
<
0.05);结肠组织中TLR2、TLR4、MyD88和NF-
κ
B蛋白表达明显增加(
P
<
0.05);物种丰富度(Richness)、Chao1丰富度指数(Chao1)、丰度覆盖估计指数(ACE)及Shannon多样性指数均明显降低(
P
<
0.05),厚壁菌门(Firmicutes)、放线菌门(Actinobacteria)、拟杆菌属-H(
Bacteroides-
H)、乳杆菌属(
Lactobacillus
)和唾液乳杆菌属(
Ligilactobacillus
)的相对丰富度明显降低(
P
<
0.05),拟杆菌门(Bacteroidetes)、变形菌门(Proteobacteria)、普氏菌属(
Prevotella
)相对丰富度明显升高(
P
<
0.05)。与模型组比较,SLBZS-H组、SLBZS-M组、SLBZS-L组及匹维溴铵组大鼠的结肠结构组织更加清晰,且仅部分区域存在少量炎性细胞、血清中TNF-
α
、IL-1
β
、IL-6和5-HT含量明显降低(
P
<
0.05)、TLR2、TLR4、MyD88和NF-
κ
B蛋白表达明显减少(
P
<
0.05);分组信息不明确微生物方面,相比于模型组,SLBZS-H、SLBZS-M、SLBZS-L组Richness、Chao1、ACE及Shannon多样性指数均明显上升(
P
<
0.05),Firmicutes和Actinobacteria的丰富度明显升高(
P
<
0.05),Bacteroidetes、Proteobacteria和
Prevotella
丰富度明显降低(
P
<
0.05),匹维溴铵组中
Prevotella
明显减少(
P
<
0.05)、拟杆菌属-H(
Bacteroides-
H)、
Muribaculum
、乳杆菌属(
Lactobacillus
)、唾液乳杆菌(
Lactobacillus salivarius
)相对丰富度明显增加(
P
<
0.05)。
结论
2
参苓白术散能够有效治疗IBS-D,其分子机制可能是通过改善肠道菌群和抑制TLRS/MYD88/NF-
κ
B信号通路降低炎症反应发挥治疗作用。
Objective
2
Based on 16S rDNA technology and molecular biology methods, the molecular mechanism of Shenling Baizhusan in the treatment of diarrhea-predominant irritable bowel syndrome (IBS-D) was investigated.
Methods
2
The 42 SD rats with SPF were randomly divided into no control group, SLBZS-H, medium (SLBZS-M), low (SLBZS-L) dose group,
positive control group and model group, with 7 rats in each group. The rat model of IBS-D was prepared by ice-cold senna (0.45 g∙mL
-1
) gavage (10 mL∙kg
-1
) combined with restraint stress for 14 consecutive days. After successful modeling, the corresponding drugs were given to each group with a gavage volume of 10 mL∙kg
-1
: The positive group was administered with 2.36 , 1.18, 0.59 g∙mL
-1
of Shenling Baizhusan in the Positive group and the Model group with the same volume of normal saline for 14 d. The general condition of the rats: Weight, feces, mental state and death were observed and recorded. The body weight, abdominal wall retraction reflex score (AWR) and loose stool rate of rats in each group were measured before (the first day), after the model (day 14) and after treatment (day 28). Hematoxylin-eosin staining was used to observe the morphological characteristics of colon tissues of experimental animals. Enzyme-linked immunosorbent assay was used to quantitatively analyze the concentration of inflammatory mediators in the peripheral blood of experimental animals. Western blotting was used to detect the expression levels of key proteins of Toll-like receptor 4 (TLR4), Toll-like receptor 2 (TLR2), myeloid differentiation factor 88 (MyD88) and nuclear factor-
κ
B (NF-
κ
B) signaling pathway in rat colon tissue. 16S rDNA technology was used to detect the structural changes of intestinal microbiota in rats.
Results
2
Compared with Control, the colon of the Model group showed partial mucosal epithelial shedding and inflammatory cell infiltration. The contents of TNF-
α
, IL-1
β
, IL-6 and 5-HT in serum increased (
P
<
0.05), the protein expressions of TLR2, TLR4, MyD88 and NF-
κ
B in colon tissue increased (
P
<
0.05), the diversity indices of Richness, Chao1, abundance-based coverage estimator(ACE) and Shannon decreased (
P
<
0.05), and the phylum Firmicutes, Actinobacteria, The relative richness of
Bacteroides
-H,
Lactobacillus
and
Ligilactobacillus
decreased (
P
<
0.05), while the relative richness of Bacteroidetes, Proteobacteria and
Prevotella
increased (
P
<
0.05). Compared with the model group, the colonic structure and organization of the SLBZS-H group, SLBZS-M group, SLBZS-L group and Positive group were clearer, and only a small number of inflammatory cells were present in some areas, and the serum contents of TNF-
α
, IL-1
β
, IL-6 and 5-HT were decreased (
P
<
0.05), TLR2, TLR4, The protein expressions of MyD88 and NF-
κ
B decreased (
P
<
0.05), and compared with the model group, the diversity indices of Richness, Chao1, ACE and Shannon in the SLBZS-H, SLBZS-M and SLBZS-L groups increased (
P
<
0.05), and the richness of Firmicutes and Actinobacteria increased (
P
<
0.05). The richness of Proteobacteria and
Prevotella
decreased (
P
<
0.05), and the abundance of
Prevotella
decreased (
P
<
0.05),
Bacteroides
-H,
Muribaculum
,
Lactobacillus
and
salivarius
in the Positive group salivarius (
P
<
0.05).
Conclusion
2
Shenling Baizhusan can effectively treat IBS-D, and its molecular mechanism may be to play a therapeutic role by improving intestinal flora and inhibiting the TLRS/MyD88/NF-
κ
B signaling pathway to reduce inflammatory response.
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