Yu-han WANG, Yan-hua JIANG, Li-hua XIANG, et al. Effect of Erxiantang on Cardiac Function and Blood Pressure Dynamic Evolution in Ovariectomized Rats. [J]. Chinese Journal of Experimental Traditional Medical Formulae 26(3):53-61(2020)
DOI:
Yu-han WANG, Yan-hua JIANG, Li-hua XIANG, et al. Effect of Erxiantang on Cardiac Function and Blood Pressure Dynamic Evolution in Ovariectomized Rats. [J]. Chinese Journal of Experimental Traditional Medical Formulae 26(3):53-61(2020) DOI: 10.13422/j.cnki.syfjx.20200339.
Effect of Erxiantang on Cardiac Function and Blood Pressure Dynamic Evolution in Ovariectomized Rats
To investigate the evolution of cardiac function and blood pressure in ovariectomized rats and the effect and mechanism of Erxiantang.
Method:
2
Healthy 10-week-old female SPF SD rats were randomly divided into sham operation group
model group
estrogen group(estradiol valerate
0.18 mg·kg
-1
) and Erxiantang group(7.5 g·kg
-1
). The rats were intragastrically administered 2 weeks after ovariectomy
once a day for 12 weeks.Sham operation groups and model groups were given equal volumes of purified water.At the 4
th
week
8
th
week
and 12
th
week after administration
the cardiac function
blood pressure
and levels of estrogen (E
2
) in rat serum were measured by non-invasive ultrasound cardiogram (UCG)
tail artery detection techniques and radioimmunoassay.The levels of endothelin-1 (ET-1) and angiotensin 2(Ang Ⅱ) in rat serum were detected by enzyme-linked immuno sorbent assay (ELISA). The cardiac morphology and apoptosis were detected by hematoxylin-eosin (HE) staining
electron microscopy and Terminal-deoxynucleoitidyl transferase mediated nick end labeling (TUNEL).
Result:
2
Compared with sham operation group
the ejection fraction (EF) decreased and the left ventricular end systolic volume (LVVols) increased in the model group at 4
th
week after administration(
P
<
0.05). There was no significant difference in cardiac function between the groups at 8
th
week.The left ventricular end diastolic diameter (LVIDs)
LVVols
left ventricular end diastolic diameter (LVIDd)
and left ventricular end diastolic volume (LVVold) were significantly increased in the model group at 12
th
week (
P
<
0.01). At the 4
th
weeks
8
th
week and 12
th
week
the systolic blood pressure (SBP) of the model group increased (
P
<
0.05) and showed an increasing trend
and the diastolic blood pressure (DBP) did not change significantly.At the 12
th
week
the levels of E
2
in serum decreased (
P
<
0.05)
ET-1 and Ang Ⅱ increased of the model group (
P
<
0.01). The cardiac myofibrils were irregular
some myofilament was broken
and mitochondrial palsy was disordered
broken or disappeared
and cardiac apoptosis increased (
P
<
0.01). Compared with the model group
myocardial contraction and diastolic function were significantly improved in Erxian decoction group
and blood pressure was decreased.The levels of E
2
in serum was increased (
P
<
0.05). The levels of ET-1 was decreased (
P
<
0.05)
and AngⅡ in serum was significantly decreased (
P
<
0.01). The mitochondrial morphological structure was improved and the cardiac apoptotic rate was significantly decreased (
P
<
0.01).
Conclusion:
2
After the ovariectomy
the rats showed a series of pathological changes such as decreased heart function and increased blood pressure.Compared with the decrease of heart function
the changes of blood pressure appeared earlier.Erxiantang exerts its intervention on cardiac function and blood pressure in ovariectomized rats by regulating E
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