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1.贵州省人民医院,贵阳 550002
2.贵阳中医学院 第二附属医院,贵阳 550003
卢丽娜,硕士,主治医师,从事老年医学研究,E-mail: lulina319@163.com
*杨冬花,博士,主任医师,从事中西医结合心血管病学研究,E-mail:niuniucs0204@126.com
收稿日期:2018-07-19,
网络出版日期:2018-11-16,
纸质出版日期:2019-02-05
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卢丽娜, 梁赵文, 罗建华, 等. 益母草碱对血管紧张素Ⅱ诱导的心肌细胞肥大p38 MAPK信号通路和miRNA-1表达的影响[J]. 中国实验方剂学杂志, 2019,25(3):81-86.
Li-na LU, Zhao-wen LIANG, Jian-hua LUO, et al. Effect of Leonurine on p38 MAPK Signaling Pathway and miRNA-1 in Cardiomyocyte Hypertrophy Induced by AngⅡ[J]. Chinese journal of experimental traditional medical formulae, 2019, 25(3): 81-86.
卢丽娜, 梁赵文, 罗建华, 等. 益母草碱对血管紧张素Ⅱ诱导的心肌细胞肥大p38 MAPK信号通路和miRNA-1表达的影响[J]. 中国实验方剂学杂志, 2019,25(3):81-86. DOI: 10.13422/j.cnki.syfjx.20190337.
Li-na LU, Zhao-wen LIANG, Jian-hua LUO, et al. Effect of Leonurine on p38 MAPK Signaling Pathway and miRNA-1 in Cardiomyocyte Hypertrophy Induced by AngⅡ[J]. Chinese journal of experimental traditional medical formulae, 2019, 25(3): 81-86. DOI: 10.13422/j.cnki.syfjx.20190337.
目的:
2
研究益母草碱对血管紧张素Ⅱ(angiotensin
AngⅡ)诱导心肌细胞肥大的作用,并分析其对p38丝裂原活化蛋白激酶(p38 mitogen-activated protein kinase
p38 MAPK)信号通路和微小RNA-1(microRNA-1,miRNA-1)表达的影响。
方法:
2
以AngⅡ(0.1 μmol·L
-1
)诱导肥大心肌细胞。实验分为空白组,模型组,p38 MAPK抑制剂组(SB203580,10 μmol·L
-1
)以及益母草碱低、中、高浓度组(5,10,20 μmol·L
-1
)。以图像分析软件测量心肌细胞表面积;Folin-酚试剂法(Lowry)检测心肌细胞蛋白含量;酶联免疫吸附测定法(enzyme-linked immunosorbent assay
ELISA)检测细胞上清心房钠尿肽(atrial natriuretic peptide
ANP)含量;实时荧光定量聚合酶链式反应(Real-time PCR)检测心肌细胞miRNA-1 mRNA的表达水平;蛋白免疫印迹法(Western blot)检测心肌细胞内皮素-1(endothelin-1,ET-1),p38 MAPK,磷酸化p38 MAPK(p-p38 MAPK),肌细胞增强因子2 (myocyte enhancer factor 2,MEF2),
β
-肌球蛋白重链(
β
-myosin heavy chain
β
-MHC)和
α
-肌球蛋白重链(
α
-myosin heavy chain
α
-MHC)蛋白的表达水平。
结果:
2
与空白组比较,模型组心肌细胞表面积、蛋白含量及细胞上清ANP含量明显升高(
P
<
0.05),ET-1,p38 MAPK
p-p38 MAPK
MEF2和
β
-MHC蛋白表达水平明显上调(
P
<
0.05),
α
-MHC蛋白及miRNA-1 mRNA的表达水平明显下调(
P
<
0.05)。与模型组比较,益母草碱高浓度组明显减少肥大心肌细胞表面积、蛋白含量及细胞上清ANP含量(
P
<
0.05);下调ET-1,p38 MAPK
p-p38 MAPK
MEF2和
β
-MHC蛋白表达水平(
P
<
0.05);上调
α
-MHC蛋白及miRNA-1的表达水平(
P
<
0.05)。
结论:
2
益母草碱高浓度组(20 μmol·L
-1
)可抑制AngⅡ诱导的心肌细胞肥大,其机制可能与抑制p38 MAPK信号通路活化和上调miRNA-1的表达有关。
Objective:
2
To investigate the inhibitory effect of leonurine on cardiomyocyte hypertrophy induced by angiotensin Ⅱ(Ang Ⅱ) and its effect on p38 mitogen-activated protein kinase (p38 MAPK) signaling pathway and miRNA-1.
Method:
2
Cardiomyocyte hypertrophy was induced by Ang Ⅱ (0.1 μmol·L
-1
) in primary neonatal cardiomyocytes. Experiments were designed in 6 groups as following: normal group
model group
p38 MAPK inhibitor group (SB203580
10 μmol·L
-1
)
low-dose(5 μmol·L
-1
)
middle-dose(10 μmol·L
-1
) and high-dose(20 μmol·L
-1
) group. The cardiomyocyte surface area was measured by image software
and the protein contents were detected by Lowry. The concentrations of ANP in the culture supernatant were measured by enzyme-linked immunosorbent assay (ELISA). The expression level of miRNA-1 was detected by Real-time fluorescence quantitative polymerase chain reaction (Real-time PCR)
and the protein expression levels of endothelin-1 (ET-1)
p38 MAPK
p-p38 MAPK
myocyte enhancer factor 2 (MEF2)
β
-myosin heavy chain (
β
-MHC)
α
-myosin heavy chain (
α
-MHC) were detected by Western blot.
Result:
2
Compared with normal group
the surface area of cardiomyocyte
the protein contents
the concentrations of ANP
and the protein expression levels of ET-1
p38 MAPK
p-p38 MAPK
MEF2
β
-MHC in model group were higher (
P
<
0.05)
but the protein expression levels of
α
-MHC and miRNA-1 were lower than those in normal group (
P
<
0.05). Compared with model group
the surface area of cardiomyocyte
the protein contents
the concentrations of ANP
and the protein expression levels of ET-1
p38 MAPK
p-p38 MAPK
MEF2
β
-MHC in high-dose group were lower (
P
<
0.05)
but the protein expression levels of
α
-MHC and miRNA-1 were higher than those in model group (
P
<
0.05).
Conclusion:
2
Leonurine (20 μmol·L
-1
) could inhibit cardiomyocyte hypertrophy induced by AngⅡ
and the mechanism is related to the inhibition of activation of p38 MAPK signaling pathway and up-regulation the expression of miRNA-1.
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