[Intervention effects of estradiol on myocardial ischemia- reperfusion injury of rat and its mechanisms].
Zhongguo Ying Yong Sheng Li Xue Za Zhi
; 38(6): 638-643, 2022 Nov.
Article
in Zh
| MEDLINE
| ID: mdl-37308409
ABSTRACT
Objective:
To study the effects of estradiol (E2) on alleviating myocardial ischemia/reperfusion(I/R) injury through estrogen receptorß(ERß) mediated extracellular regulated protein kinases(ERK) pathway activation.Methods:
Eighty-four adult female SD rats were ovariectomized and randomly divided into control group, NC siRNA adeno-associated virus (AAV) group received sham operation, the myocardial I/R injury model was prepared by ligation of the left anterior descending coronary artery in I/R group, E2+I/R group, NC siRNA AAV+I/R group, NC siRNA AAV+E2+I/R group and ERß-siRNA AAV+E2+I/R group. E2+I/R group, NC siRNA AAV+E2+I/R group and ERß-siRNA AAV+E2+I/R group were treated with E2 0.8 mg/kg by gavage for 60 days before modeling. NC siRNA AAV+I/R group, NC siRNA AAV+E2+I/R group, and ERß-siRNA AAV+E2+I/R group were treated with AAV by caudal vein injection 24 h before modeling. After 120 min of reperfusion, the contents of serum lactate dehydrogenase (LDH), phosphocreatine kinase (CK), phosphocreatine kinase isoenzyme (CK-MB), myocardial infarction area and the expressions of ERß, p-ERK, the contents of tumor necrosis factor-α(TNF-α), interleukin-1ß(IL-1 ß), malondialdehyde (MDA) and total antioxidant capacity (T-AOC) in myocardium were measured.Results:
The contents of serum LDH, CK, CK-MB, myocardial infarction area and the contents of TNF-α, IL-1 ß, MDA in myocardium of I/R group were higher than those of the control group, the expression levels of ERß and p-ERK and the content of T-AOC were lower than those in the control group (Pï¼0.05). The contents of serum LDH, CK and CK-MB, myocardial infarction area and the contents of TNF-α, IL-1 ß and MDA in myocardium of E2+I/R group were lower than those of the I/R group, the expression levels of ERß and p-ERK and the content of T-AOC were higher than those of the I/R group(Pï¼0.05). After knockdown ERß by caudal vein injection of ERß-siRNA AAV, the contents of serum LDH, CK and CK-MB, myocardial infarction area and the contents of TNF-α, IL-1 ß and MDA in myocardium of ERß-siRNA AAV+E2+I/R group were higher than those of NC-siRNA AAV+E2+I/R, the expression levels of ERß and p-ERK and the content of T-AOC were lower than those of NC-siRNA AAV+E2+I/R(Pï¼0.05).Conclusion:
E2 has protective effects on myocardial I / R injury in ovariectomized rats, which are related to the promotion of ERß mediating the activation of ERK pathway, reducing inflammatory and oxidative stress responses.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Myocardial Reperfusion Injury
/
Myocardial Ischemia
/
Myocardial Infarction
Type of study:
Prognostic_studies
Limits:
Animals
Language:
Zh
Journal:
Zhongguo Ying Yong Sheng Li Xue Za Zhi
Journal subject:
FISIOLOGIA
Year:
2022
Document type:
Article