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天津市第一中心医院,天津 300192
Published:20 July 2019,
Published Online:19 March 2019,
Received:08 December 2018,
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Xiao-long LIU, Zi-lin CUI, Yang LI, et al. Protective Effect of Salvianolic Acid B on Myocardial Injury in Septic Rats. [J]. Chinese Journal of Experimental Traditional Medical Formulae 25(14):112-118(2019)
Xiao-long LIU, Zi-lin CUI, Yang LI, et al. Protective Effect of Salvianolic Acid B on Myocardial Injury in Septic Rats. [J]. Chinese Journal of Experimental Traditional Medical Formulae 25(14):112-118(2019) DOI: 10.13422/j.cnki.syfjx.20191337.
目的:
2
探讨丹酚酸B(salvianolic acid B,Sal-B)对脓毒症大鼠心肌损伤的作用及机制。
方法:
2
将50只雄性SD大鼠随机分为假手术组,模型组(行盲肠结扎穿孔术复制脓毒症动物模型),Sal-B组低、中、高剂量组(在模型基础上,经尾静脉注射Sal-B 6,12,24 mg·kg
-1
)。采用酶联免疫吸附测定(ELISA)检测心肌坏死标志物和炎症因子,包括血清肌钙蛋白T(TnT),肌酸激酶同工酶(CK-MB),心肌肌钙蛋白I(cTnI)和肿瘤坏死因子-
α
(TNF-
α
),白细胞介素(IL)-1
β
,IL-6水平;比色法检测心肌中超氧化物歧化酶(SOD)的活性和丙二醛(MDA)的含量;采用苏木素-伊红(HE)染色观察各组心肌组织病理变化;采用原位末端标记法(TUNEL)检测心肌细胞凋亡情况;采用蛋白免疫印迹法(Western blot)检测心肌组织中凋亡相关蛋白半胱氨酸蛋白酶-3(Caspase-3),B淋巴细胞瘤-2(Bcl-2),Bcl-2相关X蛋白(Bax)和自噬微管相关蛋白轻链3(LC3),Beclin-1表达水平。
结果:
2
与假手术组比较,模型组TnT,CK-MB和cTnI水平显著升高(
P
<
0.01);心肌组织TNF-
α
,IL-1
β
,IL-6水平显著升高(
P
<
0.01);心肌组织MDA含量显著升高(
P
<
0.01),SOD的活力显著降低(
P
<
0.01),TUNEL阳性心肌细胞比率显著升高(
P
<
0.01),Bax和Caspase-3蛋白表达水平升高,而Bcl-2表达显著降低(
P
<
0.01),自噬相关蛋白LC3,Beclin-1表达水平显著升高(
P
<
0.01);与模型组比较,Sal-B中、高剂量组TnT,CK-MB和cTnI水平均显著降低(
P
<
0.01),心肌组织TNF-
α
,IL-1
β
,IL-6水平显著降低(
P
<
0.01),心肌组织MDA含量明显降低(
P
<
0.05,
P
<
0.01),同时,心肌组织SOD的活性明显升高(
P
<
0.05,
P
<
0.01);TUNEL阳性心肌细胞比率明显降低(
P
<
0.05),Bax和Caspase-3蛋白表达下降,Bcl-2表达明显升高(
P
<
0.05,
P
<
0.01);同时增强自噬反应,LC3Ⅱ/LC3Ⅰ增加,Beclin-1表达水平明显上调(
P
<
0.05,
P
<
0.01)。
结论:
2
Sal-B通过影响自噬蛋白,降低脓毒症大鼠心肌炎症反应和氧化应激,抑制心肌细胞凋亡,从而减轻脓毒症大鼠心肌的损伤。
Objective:
2
To explore the effect of salvianolic acid B (Sal-B) on the myocardial apoptosis in rats with sepsis.
Method:
2
The 50 male SD rats were randomly divided into sham operation group
model group (cecal ligation and perforation were performed to replicate the animal model of sepsis)and Sal-B low
medium and high-dose group(6
12
24 mg·kg
-1
). The myocardial necrosis markers troponin T(TnT)
cardiac troponin I (cTnI)
creatine kinase-MB (CK-MB) and the tumor necrosis factor-
α
(TNF-
α
)
interleukin-1
β
(IL-1
β
) and interleukin-6 (IL-6) were assayed by enzyme-linked immunosorbent assay(ELISA). The antioxidant enzyme superoxide dismutase (SOD) activities and malonaldialdehyde (MDA) levels in myocardial homogenates were determined by spectrophotometrically. Haematoxylin-eosin (HE) staining was used to evaluate the pathological change in rats. Terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling assay (TUNEL) was used to detect apoptosis of myocardial cells in hearts
respectively. Western blot was used to detect the expression levels of apoptosis-related protein cysteine protease-3 (Caspase-3)
b-lymphocytoma-2 (Bcl-2)
Bcl-2-related X protein (Bax)
autophagy microtubule-related light chain 3 (LC3) and Beclin-1 in myocardial tissue.
Result:
2
Compared with sham group
the levels of TnT
CK-MB and cTnI in model group were significantly increased (
P
<
0.01). The levels of TNF-
α
IL-1
β
and IL-6 in myocardial tissue were significantly increased (
P
<
0.01). MDA content in myocardial tissue was significantly increased (
P
<
0.01)
SOD activity in myocardial tissue was significantly decreased (
P
<
0.01)
the ratio of TUNEL positive myocardial cells was significantly increased (
P
<
0.01)
Bax and Caspase-3 protein expression levels were significantly increased
while Bcl-2 expression was significantly decreased (
P
<
0.01)
autophagy related protein LC3 and Beclin-1 expression levels were significantly increased (
P
<
0.01). Compared with model group
the levels of TnT
CK-MB and cTnI in Sal-B medium and high-dose groups were significantly decreased (
P
<
0.01)
the levels of TNF-
α
IL-1 and IL-6 in the myocardial tissue were significantly decreased (
P
<
0.01)
MDA content in myocardial tissue was significantly decreased (
P
<
0.05
P
<
0.01)
and the SOD activity in myocardial tissue was significantly increased (
P
<
0.05
P
<
0.01). The ratio of TUNEL positive cardiomyocytes was significantly decreased (
P
<
0.05)
Bax and Caspase-3 protein expressions were decreased
and Bcl-2 expression was significantly increased (
P
<
0.05
P
<
0.01). The autophagy response was enhanced
the LC3Ⅱ/LC3Ⅰ ratio was increased
and Beclin-1 expression was significantly up-regulated (
P
<
0.05
P
<
0.01).
Conclusion:
2
Sal-B showed a protective effect on the myocardial apoptosis in septic rats maybe by depressing inflammatory infiltration
anti-oxidative effects and improving the exceptional expression of the proteins such as Bax
Bcl-2
Caspases-3 by enhancing the level of autophagy.
丹酚酸B脓毒症心肌损伤保护作用自噬
salvianolic acid Bsepsismyocardium injuryprotect effectautophagy
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