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中华细胞与干细胞杂志(电子版) ›› 2023, Vol. 13 ›› Issue (03) : 144 -150. doi: 10.3877/cma.j.issn.2095-1221.2023.03.003

论著

南蛇藤素调节SDF-1/CXCR4信号通路对脂多糖诱导的A549细胞损伤的影响
符丽娜, 邢博真, 陈瑶, 潘相静, 符丽云, 孙少清()   
  1. 570102 海口,海南省海口市海南医学院第一附属医院呼吸科
    570102 海口,海南省海口市海南医学院第一附属医院感染科
    570102 海口,海南省海口市海南医学院第一附属医院放射科
  • 收稿日期:2022-11-04 出版日期:2023-06-01
  • 通信作者: 孙少清

Influence of Celastrol on LPS-inducedA549 cells injury by regulating SDF-1/CXCR4 signaling pathway

Lina Fu, Bozhen Xing, Yao Chen, Xiangjing Pan, Liyun Fu, Shaoqing Sun()   

  1. Department of Respiratory, the First Affiliated Hospital of Hainan Medical College, Haikou 570102, China
    Department of Infection, the First Affiliated Hospital of Hainan Medical College, Haikou 570102, China
    Department of Radiology, the First Affiliated Hospital of Hainan Medical College, Haikou 570102, China
  • Received:2022-11-04 Published:2023-06-01
  • Corresponding author: Shaoqing Sun
引用本文:

符丽娜, 邢博真, 陈瑶, 潘相静, 符丽云, 孙少清. 南蛇藤素调节SDF-1/CXCR4信号通路对脂多糖诱导的A549细胞损伤的影响[J]. 中华细胞与干细胞杂志(电子版), 2023, 13(03): 144-150.

Lina Fu, Bozhen Xing, Yao Chen, Xiangjing Pan, Liyun Fu, Shaoqing Sun. Influence of Celastrol on LPS-inducedA549 cells injury by regulating SDF-1/CXCR4 signaling pathway[J]. Chinese Journal of Cell and Stem Cell(Electronic Edition), 2023, 13(03): 144-150.

目的

分析南蛇藤素对脂多糖(LPS)诱导的肺泡上皮细胞损伤的影响以及基质细胞衍生因子-1 (SDF-1)/趋化因子受体4 (CXCR4)通路在其中发挥的作用。

方法

培养人肺泡Ⅱ型上皮细胞系A549细胞,用浓度为10 μg/mL LPS处理24 h,并在LPS处理前用终浓度为25、100 mmol/L的南蛇藤素或100 mmol/L的南蛇藤素与100 μg/mL的AMD3100 (CXCR4抑制剂)处理2 h。CCK-8法测定A549细胞活力,TUNEL法测定A549细胞凋亡,试剂盒法测定A549细胞培养上清液中乳酸脱氢酶(LDH)含量,ELISA法检测A549细胞肿瘤坏死因子(TNF)-α、白细胞介素6 (IL-6)、IL-10水平,Western blot法测定SDF-1、CXCR4蛋白表达。多组间比较采用单因素方差分析,进一步两两比较采用SNK-q法进行。

结果

与对照组相比,LPS组A549细胞TUNEL阳性率[(65.78 ± 8.21)%比(4.23 ± 0.77)%]、细胞凋亡率[(21.38 ± 2.70)%比(7.64 ± 0.95)%]、cleaved caspase-3、Bax蛋白、LDH、TNF-α、IL-6、SDF-1 (2.02 ± 0.25比0.75 ± 0.10)、CXCR4蛋白(1.59 ± 0.19比0.71 ± 0.08)升高(P < 0.05),存活率、Bcl-2蛋白、IL-10表达降低(P < 0.05);与LPS组相比,LPS+南蛇藤素低剂量组、LPS+南蛇藤素高剂量组A549细胞TUNEL阳性率[(52.51 ± 6.54)%,(41.37 ± 5.17)%比(65.78 ± 8.21)%]、细胞凋亡率[(17.62 ± 2.45)%,(12.37 ± 1.54)%比(21.38 ± 2.70)%]、cleaved caspase-3、Bax蛋白、LDH、TNF-α、IL-6、SDF-1 (1.69 ± 0.20,1.32 ± 0.18比2.02 ± 0.25)、CXCR4蛋白(1.05 ± 0.13,1.31 ± 0.16比1.59 ± 0.19)降低,存活率、Bcl-2蛋白和IL-10表达升高(P < 0.05);与LPS+南蛇藤素高剂量组相比,LPS+南蛇藤素高剂量+AMD3100组A549细胞TUNEL阳性率[(24.28 ± 4.28)%比(41.37 ± 5.17)%]、细胞凋亡率[(9.91 ± 1.25)%比(12.37 ± 1.54)%]、cleaved caspase-3、Bax蛋白、LDH、TNF-α、IL-6、SDF-1 (0.95 ± 0.13比1.32 ± 0.18)、CXCR4蛋白(0.78 ± 0.09比1.05 ± 0.13)降低,存活率、Bcl-2蛋白和IL-10表达升高(P < 0.05)。

结论

南蛇藤素可降低LPS诱导的A549细胞凋亡与炎症,提高细胞存活,其作用机制可能与抑制SDF-1/CXCR4通路有关。

Objective

To analyze the influence of Celastrol on lipopolysaccharide (LPS) -induced alveolar epithelial cell injury and the role of stromal cell-derived factor-1 (SDF-1) /chemokine receptor 4 (CXCR4) pathway in it.

Methods

Human alveolar type Ⅱ epithelial cell line A549 cells were cultured and treated with 10 μg/mL LPS for 24 h. Before LPS treatment, treat them with final concentrations of 25 mmol/L, 100 mmol/L of celastrol or 100 mmol/L of celastrol and 100 μg/L of AMD3100 (CXCR4 inhibitor) for 2 hours. The viability of A549 cells was determined by the CCK-8 method, apoptosis of A549 cells was measured by the TUNEL method, the LDH of A549 cells was determined by kits, the levels of tumor necrosis factor (TNF) -α, interleukin-6 (IL-6) and IL-10 in A549 cells were detected by ELISA, and the expression of SDF-1 and CXCR4 protein were as detected by Western blot. One-way analysis of variance was used for statistical comparison among multiple groups, and the SNK-q method was used for further pairwise statistical comparison.

Results

Compared with the control group, the positive rate of TUNEL [ (65.78 ± 8.21) % vs (4.23 ± 0.77) %], the apoptosis rate [ (21.38 ± 2.70) %vs (7.64 ± 0.95) %], cleaved caspase-3, Bax protein, LDH, TNF-α, IL-6, SDF-1 (2.02 ± 0.25 vs 0.75 ± 0.10) , and CXCR4 (1.59 ± 0.19 vs 0.71 ± 0.08) protein were increased in A549 cells in LPS group (P < 0.05) , and the survival rate, Bcl-2 protein and IL-10 expression decreased (P < 0.05) ; compared with the LPS group, the positive rate of TUNEL [ (52.51 ± 6.54) %, (41.37 ± 5.17) %vs (65.78 ± 8.21) %], the apoptosis rate was [ (17.62 ± 2.45) %, (12.37 ± 1.54) %vs (21.38 ± 2.70) %], cleaved caspase-3, Bax protein, LDH, TNF-α, IL-6, SDF-1 (1.69 ± 0.20, 1.32 ± 0.18 vs 2.02 ± 0.25) , CXCR4 (1.31 ± 0.16, 1.05 ± 0.13 vs 1.59 ± 0.19) protein in A549 cells in the low-dose Celastrol group and high-dose Celastrol group significantly reduced, and the survival rate, Bcl-2 protein and IL-10 expression significantly increased (P < 0.05) ; compared with the high-dose Celastrol group, the positive rate of TUNEL[ (24.28 ± 4.28) %vs (41.37 ± 5.17) %], the apoptosis rate [ (9.91 ± 1.25) %vs (12.37 ± 1.54) %], and cleaved caspase-3, Bax protein, LDH, TNF-α, IL-6, SDF-1 (0.95 ± 0.13 vs 1.32 ± 0.18) , and CXCR4 (0.78 ± 0.09 vs 1.05 ± 0.13) protein of A549 cells in the high-dose Celastrol + AMD3100 group decreased, and the survival rate, Bcl-2 protein and IL-10 expression significantly increased (P < 0.05) .

Conclusion

Celastrol can reduce LPS-induced apoptosis and inflammation of A549 cells and improve cell survival, which may be related to the inhibition of the SDF-1/CXCR4 pathway.

表1 A549细胞存活率比较( ± s
图1 荧光显微镜下观察A549细胞凋亡(TUNEL染色,×200)注:a、b图为对照组、LPS组A549细胞TUNEL阳性染色结果,可见TUNEL阳性细胞与对照组相比增多;c、d为LPS+南蛇藤素低剂量组、LPS+南蛇藤素高剂量组A549细胞TUNEL阳性染色结果,可见TUNEL阳性细胞与LPS组相比减少;e为LPS+南蛇藤素高剂量+AMD3100组A549细胞TUNEL阳性染色结果,可见TUNEL阳性细胞与LPS+南蛇藤素高剂量组相比减少
图2 流式细胞术观察A549细胞凋亡注:a图为对照组;b图为LPS组,可见细胞凋亡率与对照组相比增加;c、d图为LPS+南蛇藤素低剂量组、LPS+南蛇藤素高剂量组,可见细胞凋亡率与LPS组相比降低;e为LPS+南蛇藤素高剂量+AMD3100组,可见细胞凋亡率与LPS+南蛇藤素高剂量组相比降低
图3 Western blot检测A549细胞cleaved caspase-3、Bax、Bcl-2蛋白表达
表2 A549细胞TUNEL阳性率、cleaved caspase-3、Bax、Bcl-2蛋白表达比较( ± sn = 3)
表3 A549细胞LDH比较( ± s
表4 A549细胞TNF-α、IL-6、IL-10表达比较( ± s
图4 Western blot检测A549细胞SDF-1/CXCR4通路蛋白表达
表5 A549细胞SDF-1/CXCR4通路蛋白表达情况( ± s
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