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1.江西中医药大学,南昌 330004
2.南昌大学 第一附属医院,南昌 330004
李玉婷,在读硕士,从事中药药理心血管研究,E-mail:1819810145@qq.com
刘玉晖,博士,教授,从事中药药理心血管研究,E-mail:liuyuhui77@126.com
收稿日期:2023-06-01,
网络出版日期:2023-08-16,
纸质出版日期:2023-10-05
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李玉婷,雷志强,游宇等.基于TLR4/NF-κB/NLRP3通路探讨补阳还五汤调控巨噬细胞极化的作用机制[J].中国实验方剂学杂志,2023,29(19):18-25.
LI Yuting,LEI Zhiqiang,YOU Yu,et al.Mechanism of Buyang Huanwutang in Regulating Macrophage Cell Polarization Based on TLR4/NF-κB/NLRP3 Pathway[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(19):18-25.
李玉婷,雷志强,游宇等.基于TLR4/NF-κB/NLRP3通路探讨补阳还五汤调控巨噬细胞极化的作用机制[J].中国实验方剂学杂志,2023,29(19):18-25. DOI: 10.13422/j.cnki.syfjx.20231013.
LI Yuting,LEI Zhiqiang,YOU Yu,et al.Mechanism of Buyang Huanwutang in Regulating Macrophage Cell Polarization Based on TLR4/NF-κB/NLRP3 Pathway[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(19):18-25. DOI: 10.13422/j.cnki.syfjx.20231013.
目的
2
基于Toll样受体4(TLR4)/核转录因子-
κ
B(NF-
κ
B)/核苷酸结合寡聚化结构域样受体3(NLRP3)通路探讨补阳还五汤调控巨噬细胞极化的作用机制。
方法
2
本实验通过采用不同浓度(0、1.25、2.5、5、10、20、40、80 mg·L
-1
)脂多糖(LPS)对RAW264.7巨噬细胞干预24 h,细胞增殖与活性检测(CCK-8)法检测RAW264.7巨噬细胞存活率,筛选最适浓度建立体外LPS诱导RAW246.7巨噬细胞炎症模型。将实验分为空白组(20%空白血清),模型组(20%空白血清+10 mg·L
-1
LPS),模型对照组(20%FBS+10 mg·L
-1
LPS),低、中、高(5%、10%、20%)补阳还五汤含药血清组及NLRP3抑制剂MCC950(50 μmol·L
-1
)、活性氧(ROS)抑制剂NAC(10 μmol·L
-1
)、NF-
κ
B抑制剂PDTC(10 μmol·L
-1
)联合补阳还五汤高剂量(20%)组。酶联免疫吸附测定法(ELISA)检测RAW264.7巨噬细胞白细胞介素-1
β
(IL-1
β
)、白细胞介素-18(IL-18)、肿瘤坏死因子-
α
(TNF-
α
)的表达情况;流式细胞术检测巨噬细胞ROS水平;蛋白免疫印迹法(Western blot)检测M1型巨噬细胞相关细胞因子诱导型一氧化氮合酶(iNOS)、肿瘤坏死因子-
α
(TNF-
α
)、M2型巨噬细胞相关细胞因子精氨酸酶1(Arg-1)、白细胞介素-10(IL-10)蛋白表达,TLR4/NF-
κ
B/NLRP3通路的相关蛋白表达。
结果
2
CCK-8结果显示,在10 mg·L
-1
LPS的刺激下,RAW264.7巨噬细胞的细胞活力值最高(
P
<
0.01)。与空白组比较,模型组IL-1
β
、IL-18、TNF-
α
水平显著升高(
P
<
0.01);ROS表达量显著上升(
P
<
0.01);M1型巨噬细胞iNOS、TNF-
α
蛋白表达显著升高(
P
<
0.01),M2型巨噬细胞Arg-1、IL-10蛋白表达显著降低(
P
<
0.01);TLR4、髓样分化因子88(Myd88)、磷酸化核转录因子-
κ
B抑制蛋白(p-I
κ
B)/核转录因子-
κ
B抑制蛋白(I
κ
B)、磷酸化核转录因子-
κ
B(p-NF-
κ
B) p65/NF-
κ
B p65、NLRP3、凋亡相关斑点样蛋白(ASC)、胱天蛋白酶-1前体(pro-Caspase-1)蛋白表达水平明显升高(
P
<
0.05,
P
<
0.01)。与模型组比较,补阳还五汤各给药组及抑制剂组均可明显降低IL-1
β
、IL-18、TNF-
α
水平(
P
<
0.05,
P
<
0.01),抑制RWA264.7巨噬细胞炎症因子的表达;降低细胞ROS表达水平(
P
<
0.01);下调M1型巨噬细胞iNOS、TNF-
α
蛋白(
P
<
0.01),上调M2型巨噬细胞Arg-1、IL-10蛋白表达(
P
<
0.05,
P
<
0.01);降低TLR4、Myd88、p-I
κ
B/I
κ
B、p-NF-
κ
B p65/NF-
κ
B p65、NLRP3、ASC、pro-Caspase-1蛋白表达水平(
P
<
0.05,
P
<
0.01)。
结论
2
补阳还五汤可改善巨噬细胞炎症反应,可能与降低巨噬细胞ROS水平,抑制RAW264.7巨噬细胞极化,下调TLR4/NF-
κ
B/NLRP3通路蛋白表达水平有关。
Objective
2
To explore the mechanism of Buyang Huanwutang in regulating macrophage polarization based on the Toll-like receptor 4 (TLR4) / nuclear factor-
κ
B (NF-
κ
B) / nucleotide-binding oligomerization domain-like receptor 3 (NLRP3) pathway.
Method
2
RAW264.7 macrophages were intervened with lipopolysaccharide (LPS) of different concentrations (0, 1.25, 2.5, 5, 10, 20, 40, and 80 mg·L
-1
) for 24 hours. Cell Counting Kit-8 (CCK-8) assay was used to determine the cell viability of RAW264.7 macrophages. The optimal concentration was chosen to establish an
in vitro
inflammation model induced by LPS. Cells were divided into a blank group (20% blank serum), a model group (20% blank serum + 10 mg·L
-1
LPS), a model control group (20% FBS + 10 mg·L
-1
LPS), low-, medium-, and high-dose (5%, 10%, and 20%) Buyang Huanwutang-containing serum groups, a high-dose (20%) Buyang Huanwutang combined with NLRP3 inhibitor MCC950 (50 μmol·L
-1
) group, a high-dose (20%) Buyang Huanwutang combined with reactive oxygen species (ROS) inhibitor NAC (10 μmol·L
-1
) group, and a high-dose (20%) Buyang Huanwutang combined with NF-
κ
B inhibitor PDTC (10 μmol·L
-1
) group. Enzyme-linked immunosorbent assay (ELISA) was used to detect the expression of interleukin-1
β
(IL-1
β
), interleukin-18 (IL-18), and tumor necrosis factor-
α
(TNF-
α
) in RAW264.7 macrophages. Flow cytometry was employed to measure ROS levels in macrophages. Western blot was used to determine the protein expression of M1-type macrophage-related factors inducible nitric oxide synthase (iNOS) and TNF-
α
, M2-type macrophage-related factors arginase-1 (Arg-1) and interleukin-10 (IL-10), as well as the proteins in the TLR4/NF-
κ
B/NLRP3 pathway.
Result
2
CCK-8 results indicated that under 10 mg·L
-1
LPS stimulation, RAW264.7 macrophages exhibited the highest cell viability (
P
<
0.01). Compared with the blank group, the model group showed significantly increased levels of IL-1
β
, IL-18, and TNF-
α
(
P
<
0.05,
P
<
0.01), increased ROS expression (
P
<
0.05,
P
<
0.01), increased protein expression of M1-type macrophage factors iNOS and TNF-
α
(
P
<
0.01), decreased protein expression of M2-type macrophage factors Arg-1 and IL-10 (
P
<
0.05,
P
<
0.01), and upregulated expression levels of TLR4, myeloid differentiation factor 88 (MyD88), phosphorylated inhibitor of NF-
κ
B (p-I
κ
B)/NF-
κ
B inhibitor (I
κ
B), phosphorylated NF-
κ
B (p-NF-
κ
B) p65/NF-
κ
B p65, NLRP3, apoptosis-associated speck-like protein containing a CARD (ASC), and pro-Caspase-1 (
P
<
0.05,
P
<
0.01). Compared with the model group, all Buyang Huanwutang-treated groups and inhibitor groups significantly reduced levels of IL-1
β
, IL-18, and TNF-
α
(
P
<
0.01), suppressed the expression of inflammatory factors in RAW264.7 macrophages, decreased cellular ROS expression levels (
P
<
0.01), downregulated M1-type macrophages iNOS and TNF-
α
protein expression (
P
<
0.01), upregulated M2-type macrophages Arg-1 and IL-10 protein expression (
P
<
0.01), and lowered protein expression levels of TLR4, MyD88, p-I
κ
B/I
κ
B, p-NF-
κ
B p65/NF-
κ
B p65, NLRP3, ASC, and pro-Caspase-1 (
P
<
0.05,
P
<
0.01).
Conclusion
2
Buyang Huanwutang can improve macrophage inflammation, potentially by reducing macrophage ROS levels, inhibiting RAW264.7 macrophage polarization, and downregulating the protein expression levels of the TLR4/NF-
κ
B/NLRP3 pathway.
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