苦杏仁苷对流感病毒FM1诱导的微血管内皮细胞通透性的影响

Effects of amygdalin on permeability of microvascular endothelial cells induced by influenza virus FM1

目的研究苦杏仁苷对甲型流感病毒FM1诱导的微血管内皮细胞(PMVEC)通透性增加的影响及其作用机制。方法将PMVEC随机分为对照组、模型组(100 TCID_(50) FM1)、苦杏仁苷低剂量组(100 TCID_(50) FM1+4.0 mg·mL^(-1)苦杏仁苷)、苦杏仁苷中剂量组(100 TCID_(50) FM1+8.0 mg·mL^(-1)苦杏仁苷)、苦杏仁苷高剂量组(100 TCID50 FM1+16.0 mg·mL^(-1)苦杏仁苷)及740Y-P组(100 TCID50 FM1+16.0 mg·mL^(-1)苦杏仁苷+50μmol·L^(-1)的PI3K激活药740Y-P)。以噻唑蓝(MTT)法、Transwell法、酶联免疫吸附测定(ELISA)法、蛋白质印迹法分别检测各组细胞增殖、细胞通透性、炎性因子表达水平和蛋白表达水平。结果对照组、模型组和苦杏仁苷低、中、高剂量组的白细胞介素-6(IL-6)水平分别为(50.12±3.16)、(93.12±5.61)、(80.33±6.24)、(70.05±5.46)和(61.03±4.68)pg·mL^(-1),肿瘤坏死因子-α(TNF-α)水平分别为(101.31±9.24)、(167.05±10.31)、(142.02±10.13)、(125.34±9.87)和(112.44±8.05)pg·mL^(-1)。对照组、模型组、苦杏仁苷低剂量组、苦杏仁苷中剂量组、苦杏仁苷高剂量组、740Y-P组细胞跨上皮电阻(TER)分别为(53.01±4.17)、(24.98±2.66)、(30.01±3.49)、(36.84±3.25)、(46.23±4.31)和(30.21±3.16)Ω×cm^(2),磷酸化的磷脂酰肌醇-3-羟激酶(p-PI3K)蛋白水平分别为0.34±0.04、1.01±0.09、0.80±0.08、0.61±0.07、0.43±0.05和0.87±0.09,磷酸化雷帕霉素靶蛋白(p-mTOR)水平分别为0.27±0.03、0.82±0.10、0.60±0.06、0.42±0.03、0.31±0.02和0.84±0.02。以上指标,模型组和对照组比较,苦杏仁苷低、中、高剂量组分别与模型组比较,苦杏仁苷低、中、高剂量组之间比较,苦杏仁苷高剂量组与740Y-P组比较,在统计学上差异均有统计学意义(均P<0.05)。结论苦杏仁苷可能通过抑制PI3K/AKT/mTOR通路降低流感病毒FM1诱导的PMVEC细胞通透性增加。

Objective To investigate the effect of amygdalin on the permeability increase of microvascular endothelial cells(PMVEC)induced by influenza A virus FM1 and its mechanism.Methods The PMVEC cells were randomly divided into control group,model group(100 TCID50 FM1),amygdalin low-dose group(100 TCID_(50) FM1+4.0 mg·mL^(-1) amygdalin),amygdalin medium-dose group(100 TCID_(50) FM1+8.0 mg·mL^(-1) amygdalin),amygdalin high-dose group(100 TCID_(50) FM1+16.0 mg·mL^(-1) amygdalin)and 740Y-P group (100 TCID50 FM1+16.0 mg·mL^(-1) amygdalin+50μmol·L^(-1) PI3K activator 740Y-P).Methyl thiazolyl tetrazolium(MTT)method,Transwell method,enzyme linked immunosorbent assay(ELISA)method and Western blot method were used to detect cell proliferation,cell permeability,inflammatory factor expression level and protein expression level in each group,respectively.Results Interleukin-6(IL-6)levels in control,model,amygdalin-L,amygdalin-M,amygdalin-H groups were(50.12±3.16),(93.12±5.61),(80.33±6.24),(70.05±5.46)and(61.03±4.68)pg·mL^(-1),respectively;the levels of tumor necrosis factor-α(TNF-α)in each group were(101.31±9.24),(167.05±10.31),(142.02±10.13),(125.34±9.87)and(112.44±8.05)pg·mL^(-1),respectively.The cell transepithelial resistance(TER)of control,model,amygdalin-L,amygdalin-M,amygdalin-H and 740Y-P groups were(53.01±4.17),(24.98±2.66),(30.01±3.49),(36.84±3.25),(46.23±4.31),(30.21±3.16)Ω×cm^(2);phosphorylated phosphatidylinositol-3 hydroxy kinase(p-PI3K)protein levels in each group were 0.34±0.04,1.01±0.09,0.80±0.08,0.61±0.07,0.43±0.05,0.87±0.09,respectively;phosphorylated mammalian target of repamycin(p-mTOR)levels in each group were 0.27±0.03,0.82±0.10,0.60±0.06,0.42±0.03,0.31±0.02 and 1.01±0.12,respectively.Compared model group with control group;compared amygdalinp-L,-M,-H groups with model group;compared amygdalinp-H group with 740Y-P group,the differences of the above indicators were all statistically significant(all P<0.05).Conclusion Amygdalin may decrease the permeability of PMVEC cells induced by influenza virus FM1 by inhibiting PI3K/AKT/mTOR pathway.