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1.宁夏医科大学 基础医学院,银川 750004
2.宁夏医科大学 临床医学院,银川 750004
Received:31 August 2022,
Published Online:21 November 2022,
Published:05 June 2023
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刘亚楠,杨皓凯,闫亚娟等.枸杞多糖通过MGL/TLR信号通路调控巨噬细胞RAW264.7的活化[J].中国实验方剂学杂志,2023,29(11):106-112.
LIU Yanan,YANG Haokai,YAN Yajuan,et al.Lycium barbarum Polysaccharide Regulates Activation of RAW264.7 Macrophages Through MGL/TLR Pathway[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(11):106-112.
刘亚楠,杨皓凯,闫亚娟等.枸杞多糖通过MGL/TLR信号通路调控巨噬细胞RAW264.7的活化[J].中国实验方剂学杂志,2023,29(11):106-112. DOI: 10.13422/j.cnki.syfjx.20222104.
LIU Yanan,YANG Haokai,YAN Yajuan,et al.Lycium barbarum Polysaccharide Regulates Activation of RAW264.7 Macrophages Through MGL/TLR Pathway[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(11):106-112. DOI: 10.13422/j.cnki.syfjx.20222104.
目的
2
探讨枸杞多糖(LBP)促进巨噬细胞RAW264.7活化的机制。
方法
2
采用不同浓度(50、100、200 mg·L
-1
)的LBP刺激巨噬细胞RAW264.7,以100 μg·L
-1
的脂多糖(LPS)和100 mg·L
-1
半乳糖(Gal)作为阳性药。LBP刺激24 h后,采用细胞增殖与活性检测试剂盒(CCK-8)检测不同给药浓度的LBP(0、50、100、200、400、800 mg·L
-1
)对巨噬细胞RAW264.7的毒性影响;采用酶联免疫吸附测定法(ELISA)检测细胞培养上清中白细胞介素(IL)-6、IL-12的水平;分别通过实时荧光定量聚合酶链式反应(Real-time PCR)和蛋白免疫印迹法(Western blot)检测巨噬细胞RAW264.7 Toll样受体4(TLR4)/Toll样受体2(TLR2)/巨噬细胞半乳糖型凝集素(MGL)通路中p38丝裂原活化蛋白激酶(p38 MAPK)、细胞外调节蛋白激酶(ERK)、c-Jun氨基末端激酶(JNK)和核转录因子-
κ
B(NF-
κ
B) mRNA及蛋白表达水平;
结果
2
CCK-8结果显示,与空白组比较,400、800 mg·L
-1
LBP组干预巨噬细胞RAW264.7时,细胞存活率下降(
P
<
0.05)。ELISA结果显示,与空白组比较,50 mg·L
-1
LBP能够促进巨噬细胞RAW264.7分泌IL-12水平(
P
<
0.01);与空白组比较,100、200 mg·L
-1
LBP能够促进巨噬细胞RAW264.7分泌IL-6水平(
P
<
0.05,
P
<
0.01)。Western blot结果显示,与空白组比较,不同质量浓度的LBP组(50、100、200 mg·L
-1
)作用于巨噬细胞RAW264.7能够增强TLR4、TLR2和MGL通路中MAPK关键分子(p-p38 MAPK、p-ERK、p-NF-
κ
B、p-JNK)的蛋白表达水平(
P
<
0.05,
P
<
0.01);与模型组比较,200 mg·L
-1
LBP组能够促进巨噬细胞RAW264.7 p-NF-
κ
B蛋白表达水平(
P
<
0.01)。Real-time PCR结果显示,与空白组比较,不同质量浓度的LBP组(50、100、200 mg·L
-1
)作用于巨噬细胞RAW264.7能够增强TLR4、TLR2信号通路中MAPK关键分子p38 MAPK、ERK、NF-
κ
B、JNK的mRNA表达水平(
P
<
0.05,
P
<
0.01);与模型组比较,50、200 mg·L
-1
LBP组能够促进巨噬细胞RAW264.7 JNK、ERK2 mRNA的表达水平(
P
<
0.05,
P
<
0.01)。
结论
2
LBP能够通过TLR2/TLR4//MGL通路调控巨噬细胞RAW264.7的活化,参与免疫应答。
Objective
2
To investigate the mechanism of
Lycium barbarum
polysaccharides (LBP) in promoting the activation of RAW264.7 macrophages.
Method
2
RAW264.7 macrophages were stimulated with LBP at different concentrations (50, 100, 200 mg·L
-1
), and those stimulated with lipopolysaccharide (LPS) at 100 μg·L
-1
and galactose (Gal) at 100 mg·L
-1
as positive controls. After 24 h of LBP stimulation, the cell counting kit-8 (CCK-8) was used to detect the survival rate of RAW264.7 macrophages treated with LBP (0, 50, 100, 200, 400, 800 mg·L
-1
). The levels of interleukin-6 (IL-6) and interleukin-12 (IL-12) in cell culture supernatant were detected by enzyme-linked immunosorbent assay (ELISA). The protein and mRNA expression of p38 mitogen-activated protein kinase (MAPK), extracellular signal-regulated kinase (ERK), c-Jun
N
-terminal kinase (JNK), and nuclear factor
κ
B (NF-
κ
B) in Toll-like receptor 4 (TLR4)/Toll-like receptor 2 (TLR2)/macrophage galactose-type lectin (MGL) pathway of RAW264.7 macrophages was detected by Real-time fluorescence-based quantitative polymerase chain reaction (Real-time PCR) and Western blot.
Result
2
CCK-8 results showed that compared with the results in the blank group, the survival rate of RAW264.7 macrophages decreased in the 400, 800 mg·L
-1
LBP groups (
P
<
0.05). ELISA results showed that compared with the blank group, 50 mg·L
-1
LBP could promote the secretion of IL-12 in RAW264.7 macrophages (
P
<
0.01). Compared with the blank group, 100 mg·L
-1
LBP and 200 mg·L
-1
LBP could promote the secretion of IL-6 in RAW264.7 macrophages (
P
<
0.05,
P
<
0.01). Western blot results showed that compared with the blank group, the LBP groups (50, 100, 200 mg·L
-1
) enhanced protein expression levels of MAPK key molecules (p-p38 MAPK, p-ERK, p-NF-
κ
B, and p-JNK) in TLR4, TLR2, and MGL pathways (
P
<
0.05,
P
<
0.01). Compared with the model group, the 200 mg·L
-1
LBP group could promote the expression level of p-NF-
κ
B protein in RAW264.7 macrophages (
P
<
0.01). Real-time PCR results showed that compared with the blank group, the LBP groups (50, 100, and 200 mg·L
-1
) enhanced the mRNA expression levels of MAPK key molecules (p38 MAPK, ERK, NF-
κ
B, and JNK) in TLR4 and TLR2 pathways (
P
<
0.05,
P
<
0.01). Compared with the model group, the 50 and 200 mg·L
-1
LBP groups could promote the mRNA expression levels of JNK and ERK2 in RAW264.7 macrophages (
P
<
0.05,
P
<
0.01).
Conclusion
2
LBP can regulate the activation of RAW264.7 macrophages and participate in the immune response through the TLR2/TLR4/MGL pathway.
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