丹参酚酸B抑制TLR4-NFκB-TNFα炎症损伤通路防治心肌细胞的缺氧损伤

目的:探讨TLR4-NFκB-TNFα损伤通路和HSP70在体外缺氧培养心肌细胞中的变化规律以及丹参酚酸B的调节作用。方法:分离纯化出生1～3天Wistar乳鼠心肌细胞并复制体外缺氧培养心肌细胞模型。丹参酚酸B(SalB)大、中、小剂量浓度分别为10-5mol.L-1、10-6mol.L-1和10-7mol.L-1并在缺氧培养前6h进行干预。细胞爬片免疫组化法检测tool样受体4(TLR4)和核因子κB(NFκB)蛋白的表达,ELISA法检测细胞上清液中肿瘤坏死因子α(TNFα)和热休克蛋白70(HSP70)的浓度,分光光度计法检测细胞上清液中丙二醛(MDA)和乳酸脱氢酶(LDH)的含量。结果:与正常组比较,缺氧培养6h后心肌细胞上清液中MDA、LDH、TNFα含量均显著升高(3.71±0.84)VS(1.78±0.56)(,561.41±129.31)VS(36.80±10.22)(,89.39±21.65)VS(49.42±4.16),P<0.055或P<0.051);心肌细胞TLR4和NFκB蛋白的表达量也显著升高(P<0.055或P<0.051)。与单纯缺氧培养组比较,丹参酚酸B大剂量组MDA含量显著下降(1.94±0.49)VS(3.71±0.84),P<0.051;大、中、小剂量组LDH含量均显著下降(P<0.051);大、中剂量组TNFα含量显著下降(P<0.055);丹参酚酸B大、中、小剂量组NFκB及TLR4蛋白的表达面积或强度均有明显的下降(P<0.055或P<0.051)。结论:TLR4-NFκB-TNFα炎症通路在缺氧培养6h后即明显激活,该通路的激活在缺氧损伤初期(6h内)是不依赖HSP70存在的。丹参酚酸B预防给药对缺氧培养的体外心肌细胞炎症损伤有明显的保护作用。该作用可能与抑制TLR4-NFκB-TNFα炎症通路有关。

丹参酚酸B调节缺氧损伤乳鼠心肌细胞TLR4-NFκB-TNFα炎性反应通路的量效时效关系研究

目的:探讨丹参酚酸B不同给药浓度和不同给药时间窗对缺氧损伤乳鼠心肌细胞TLR4-NFκB-TNFα炎性反应通路的调节作用。方法:分离纯化出生1~3 d Wistar乳鼠心肌细胞、建立体外缺氧细胞模型。丹参酚酸B(Sal B)大、中、小剂量浓度分别为10^(-5)mol/L、10^(-6)mol/L和10^(-7)mol/L并按照缺氧前6 h、缺氧同时和缺氧后6 h 3种给药方式进行干预。qRT-PCR法检测心肌细胞tool样受体4 (TLR4)和核因子κB(NFκB) mRNA的表达,细胞爬片免疫组化法检测TLR4和NFκB蛋白的表达,ELISA法检测细胞上清液中肿瘤坏死因子α(TNFα)的浓度。结果:与正常组比较,缺氧模型组TLR4和NFκB mRNA和蛋白的表达量、细胞上清液中TNFα浓度均显著升高(P <0. 05或P <0. 01)。和缺氧模型组比较,丹参酚酸B预防给药和同时给药大、中剂量组TLR4和NFκB mRNA和蛋白的表达量、细胞上清液中TNFα的浓度均显著下降(P <0. 05或P <0. 01)。预防给药大剂量组下降最显著(P <0. 01)。结论:TLR4-NFκB-TNFα炎性反应通路在缺氧损伤6h即明显激活。SalB预防或同时干预对缺氧损伤的心肌细胞有明显的保护作用,该作用与抑制TLR4-NFκB-TNFα炎性反应损伤通路相关。SalB具有量效和时效性,以大剂量预防给药效果最佳。

Salvianolic Acid B Inhibits the TLR4-NFκ B-TNFα Pathway and Attenuates Neonatal Rat Cardiomyocyte Injury Induced by Lipopolysaccharide

Objective： To investigate the role of the TLR4-NF K B-TNFa inflammation pathway on lipopolysaccharide （LPS）-induced neonatal rat cardiomyocyte injury and the possible protective effects of salvianolic acid B （Sal B）. Methods： Wistar rat （1-2 days old） cardiomyocytes were isolated and cultured. Sal B 10-5mol/L, 10-6mol/L and 10-7mol/L were pro-treated for 6 h in the culture medium. LPS （1 μg/mL） was added to the culture medium and kept for 6 h to induce inflammation injury. The concentration of lactate dehydrogenase （LDH） in the supernatant was detected by spectrophotometry. The concentrations of tumor necrosis factor （TNF a） and heat shock protein 70 （HSP70） in the supernatant were detected by enzyme linked immunosorbent assay. The protein expressions of toll, such as receptor 4 （TLR4） and nuclear factor kappa B （NF K B） were detected by immunohistochemistry. The mRNA expressions of TLR4 and NF K B were detected by realtime reverse transcription polymerase chain reaction （RT-PCR）. Results： （1） The concentrations of LDH and TNF a in the LPS control group were significantly higher than those in the control group （561.41 ± 67,39 U/L and 77.94± 15.08 pg/mL, versus 292.13± 26.02 U/L and 25.39 ±16.53 pg/mL, respectively, P〈0.01, P〈0.05）. Compared with the LPS control group, the concentrations of LDH and TNF α were significantly decreased in the Sal B 10-5mol/L pro-treated group （451.76 ± 83.96 U/L and 34.00± 10.38 pg/mL, respectively, P〈0.05）. （2） The TLR4 and NF K B protein expression area in the LPS control group were significantly higher than those in the control group （1712.41 ± 410.12 μm2 and 2378.15 ± 175.29 μm2, versus 418.62 ± 24.42 μ m2 and 1721.74 ± 202.87μ m2, respectively, P〈0.01）. The TLR4 and NF K B protein expression internal optical density （IOD） values in the LPS control group were also significantly higher than those in the control group （3.06 ±0.33 and 7.20± 1.04, versus 0.91 ±0.21 and 4.24±0.48, respectively, P〈0.05 and P〈0.01）. Compared with the LPS control group, the TLR4 and NF K B protein expression areas were significantly decreased in the Sal B 10Smol/L pre-treated group （1251.54± 133.82 μ m2 and 1996.37 ± 256.67 μ m2, respectively, P〈0.05）, the TLR4 and NF K B protein expression IOD values were also significantly decreased in the Sal B 10-5mol/L pretreated group （1.92 ±0.28 and 5.17 ±0.77, respectively, P〈0.05）. （3） The TLR4 and NF K B mRNA expressions （2△△CT value） in the LPS control group were significantly higher than those in the control group （3.16 ± 0.38 and 5.03±0.43 versus 1.04±0.19 and 1.08±0.21, respectively, P〈0.01）. Compared with the LPS control group, the TLR4 and NF KB mRNA expressions （2△△CT value） were significantly decreased in the Sal B 10-5mol/L pre- treated group （1.34 ±0.22 and 1.74 ± 0.26, respectively, P〈0.05）. The concentration of HSP70 did not show any statistical differences in all groups （P〉0.05）. Conclusions： The TLR4-NF K B-TNF α pathway was quickly activated and was independent of HSP70 in the early phase of neonatal cardiomyocyte injury induced by LPS. The protective effects of Sal B may be through inhibiting the TLR4-NF K B-TNF a pathway and are dose-dependent.

活血安心方减轻急性心肌梗死大鼠心肌缺血损伤的实验研究

目的观察活血安心方对急性心肌梗死(AMI)大鼠心肌缺血损伤的防治作用及其机理。方法对Wistar大鼠行冠状动脉左前降支结扎制作AMI模型,以长效异乐定为阳性对照药,活血安心方依据现代药学制剂方法提取各有效组分进行配伍,给药时间为造模当天至造模后21d,观察心功能、心脏形态改变及toll样受体4-核因子κB-肿瘤坏死因子α(TLR4-NFκB-TNFα)通路mRNA和蛋白水平的变化。结果与假手术组比较,模型组心脏射血分数(EF)和左心室缩短分数(FS)显著下降(P<0.01),左心室舒张末期内径(LVIDd)和左心室收缩末期内径(LVIDs)显著增大(P<0.01),TLR4-NFκB-TNFα通路mRNA和蛋白表达水平显著增加(P<0.01),左心室前壁梗死明显并伴有严重的炎细胞浸润和胶原纤维沉积;与模型组比较,阳性药组及活血安心方高、低剂量组EF和FS显著升高,LVIDd和LVIDs显著减小(P<0.05,P<0.01),左心室前壁梗死面积明显缩小,炎细胞浸润和胶原纤维沉积也明显减轻。活血安心方高、低剂量组还显著降低TLR4-NFκB-TNFα通路mRNA和蛋白表达水平(P<0.05,P<0.01),而阳性药组对该通路无抑制作用。结论活血安心方能显著改善AMI大鼠心肌缺血损伤导致的心脏形态结构和功能异常,该作用与其抑制TLR4-NFκB-TNFα通路激活有关。