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成都中医药大学 药学院 西南中药资源国家重点实验室,成都 611137
Received:11 November 2021,
Published Online:28 February 2022,
Published:20 July 2022
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邓英,赵兴桃,周梦婷等.连翘脂素通过调控P2X7R/NF-κB/NLRP3炎性小体信号通路缓解LPS/ATP诱导的L02细胞炎症[J].中国实验方剂学杂志,2022,28(14):61-69.
DENG Ying,ZHAO Xingtao,ZHOU Mengting,et al.Phillygenin Mitigates LPS/ATP-induced L02 Cell Inflammation by Regulating P2X7R/NF-κB/NLRP3 Inflammasome Signaling Pathway[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(14):61-69.
邓英,赵兴桃,周梦婷等.连翘脂素通过调控P2X7R/NF-κB/NLRP3炎性小体信号通路缓解LPS/ATP诱导的L02细胞炎症[J].中国实验方剂学杂志,2022,28(14):61-69. DOI: 10.13422/j.cnki.syfjx.20220808.
DENG Ying,ZHAO Xingtao,ZHOU Mengting,et al.Phillygenin Mitigates LPS/ATP-induced L02 Cell Inflammation by Regulating P2X7R/NF-κB/NLRP3 Inflammasome Signaling Pathway[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(14):61-69. DOI: 10.13422/j.cnki.syfjx.20220808.
目的
2
为研究连翘脂素(Phillygenin,PHI)对脂多糖(LPS)和腺嘌呤核苷三磷酸(ATP)联合诱导L02细胞中的抗炎药效和对P2X7受体(P2X7R),NOD样蛋白结构域受体3(NLRP3)和核转录因子-
κ
B(NF-
κ
B)表达的影响。
方法
2
本研究采用先给予100 μg
·
L
-1
LPS处理24 h后,再使用5 mmoL·L
-1
ATP 5 h建立L02细胞炎症模型。给药组在给予LPS处理的同时给予不同浓度PHI(100、50、25 mg·L
-1
)培养6 h,随后换液,继续用LPS处理18 h,ATP处理5 h后,采用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L02细胞中白细胞介素-1
β
(IL-1
β
)、白细胞介素-18(IL-18)、P2X7R、NLRP3、胱天蛋白酶-1前体(pro-Caspase-1)、裂解胱天蛋白酶-1(cleaved Caspase-1)、NF-
κ
B、NF-
κ
B抑制蛋白
α
(I
κ
B
α
) mRNA和蛋白表达。通过分子对接实验预测P2X7R与PHI能否结合,以及DCFH-DA活性氧(ROS)荧光探针检测细胞中ROS的累积。采用小干扰核糖核酸(siRNA)沉默P2X7R,并随后通过Real-time PCR检测IL-1
β
、IL-18、P2X7R、NLRP3、Caspase-1、NF-
κ
B、I
κ
B
α
mRNA表达情况。
结果
2
Real-time PCR和Western blot分析显示,与空白组比较,模型组IL-1
β
、IL-18的表达均有所升高(
P
<
0.05);与模型组比较,给药组明显下调了IL-1
β
、IL-18 mRNA和蛋白的表达(
P
<
0.05)。分子对接结果显示PHI与P2X7R有较好的结合作用。Real-time PCR和Western blot分析显示,与空白组比较,模型组P2X7R的表达明显上调(
P
<
0.05);与模型组比较,给药组下调了P2X7R mRNA和蛋白表达(
P
<
0.05)。ROS荧光探针分析显示,与空白组比较,ROS的含量明显升高(
P
<
0.05);与模型组比较,给药组明显降低了ROS的积累(
P
<
0.05)。Real-time PCR和Western blot分析显示,与空白组比较,模型组NLRP3炎性小体,NF-
κ
B的表达明显升高(
P
<
0.05);与模型组比较,给药组明显降低NLRP3、cleaved-Caspase-1和上调NF-
κ
B、I
κ
B
α
mRNA及蛋白表达(
P
<
0.05)。Real-time PCR分析显示,与模型组比较,siRNA沉默P2X7R后,IL-1
β
、IL-18、P2X7R、NLRP3、Caspase-1、NF-
κ
B、I
κ
B
α
mRNA表达明显降低(
P
<
0.05),PHI具有同样的作用,二者合用后,基因表达进一步下降。
结论
2
P2X7R为NF-
κ
B/NLRP3信号通路的上游,PHI可能是通过下调P2X7R从而抑制NF-
κ
B/NLRP3信号通路的表达从而缓解LPS/ATP诱导的L02细胞炎症,提示P2X7R可能是PHI发挥抗炎作用的靶标。
Objective
2
To explore the effects of phillygenin (PHI) on the inflammation in L02 cells induced by lipopolysaccharide (LPS) and adenosine triphosphate (ATP) and the expression of purinergic 2X7 receptor (P2X7R), NOD-like receptor family pyrin domain containing 3 (NLRP3), and nuclear factor kappa B (NF-
κ
B) expression.
Method
2
In this study, the inflammation model was induced in L02 cells by 100 μg·L
-1
LPS treatment for 24 h and 5 mmoL·L
-1
ATP treatment for 5 h. The cells in the PHI groups were cultured with PHI (100, 50, 25 mg·L
-1
) for 6 h in the LPS treatment period, followed by LPS treatment for another 18 h. After ATP treatment for 5 h, the mRNA and protein expression of interleukin-1
β
(IL-1
β
), interleukin-18 (IL-18), P2X7R, NLRP3, Caspase-1 precursor (pro-Caspase-1), cleaved Caspase-1, NF-
κ
B, and NF-
κ
B inhibitor protein
α
(I
κ
B
α
) in L02 cells was detected by real-time fluorescence quantitative polymerase chain reaction (Real-time PCR) and Western blot, respectively. Molecular docking was used to predict whether P2X7R could bind to PHI, and DCFH-DA was employed to detect the accumulation of reactive oxygen species (ROS) in cells. P2X7R was silenced by small interfering ribonucleic acid (siRNA), and then the mRNA expression of IL-1
β
, IL-18, P2X7R, NLRP3, Caspase-1, NF-
κ
B, and I
κ
B
α
was detected by Real-time PCR.
Result
2
Real-time PCR and Western blot showed that compared with the normal group, the model group showed increased expression of IL-1
β
and IL-18 (
P
<
0.05), and compared with the model group, the PHI groups showed down-regulated IL-1
β
, IL-18 mRNA and protein expression (
P
<
0.05). Molecular docking suggested a good binding effect of PHI to P2X7R. Real-time PCR and Western blot analysis showed that the expression of P2X7R in the model group was significantly up-regulated compared with that in the normal group (
P
<
0.05), and compared with the model group, the PHI groups showed down-regulated mRNA and protein expression of P2X7R (
P
<
0.05). DCFH-DA results showed that compared with the normal group, the model group showed increased content of ROS (
P
<
0.05), and compared with the model group, the PHI groups decreased the accumulation of ROS (
P
<
0.05). As demonstrated by Real-time PCR and Western blot, compared with the normal group, the model group showed increased expression of NLRP3 inflammasome and NF-
κ
B (
P
<
0.05), and compared with the model group, the PHI groups significantly decreased the mRNA and protein expression of NLRP3 and cleaved Caspase-1, and up-regulated the mRNA and protein expression of NF-
κ
B and I
κ
B
α
(
P
<
0.05). Real-time PCR analysis showed that compared with the results in the model group, after silencing P2X7R by siRNA, the mRNA expression of IL-1
β
, IL-18, P2X7R, NLRP3, Caspase-1, NF-
κ
B, and I
κ
B
α
was decreased (
P
<
0.05). PHI exerted the same effect, and the mRNA expression was further reduced after the combination of them.
Conclusion
2
PHI is presumed to suppress the expression of the NLRP3/NF-
κ
B signaling pathway by down-regulating upstream P2X7R to alleviate the LPS/ATP-induced inflammation in L02 cells, suggesting that P2X7R may be the target of PHI against inflammation.
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