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收稿:2016-12-15,
纸质出版:2017-08-30
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公欣华, 周启程, 顾业芸, 等. 二氢杨梅素改善ob/ob小鼠心脏功能及其相关作用机制研究[J]. 第三军医大学学报, 2017,39(16):1612-1617.
Xinhua GONG, Qicheng ZHOU, Yeyun GU, et al. Dihydromyricetin improves cardiac function in ob/ob mice and its underlying mechanism[J]. Journal of Third Military Medical University, 2017, 39(16): 1612-1617.
公欣华, 周启程, 顾业芸, 等. 二氢杨梅素改善ob/ob小鼠心脏功能及其相关作用机制研究[J]. 第三军医大学学报, 2017,39(16):1612-1617. DOI: 10.16016/j.1000-5404.201612114.
Xinhua GONG, Qicheng ZHOU, Yeyun GU, et al. Dihydromyricetin improves cardiac function in ob/ob mice and its underlying mechanism[J]. Journal of Third Military Medical University, 2017, 39(16): 1612-1617. DOI: 10.16016/j.1000-5404.201612114.
Objective
2
To determine the protective effect of dihydromyricetin (DHM) on cardiac function in ob/ob mice (with leptin mutation) and investigate the underlying mechanism.
Methods
2
Thirty-six male ob/ob mice were randomly divided into 3 groups: ob/ob group
ob/ob+DHM 50 mg/kg group
ob/ob+DHM 100 mg/kg group (
n
=12). Ten C57BL/6J wild type mice are used as normal control (WT). Glucose tolerance and insulin tolerance were measured after 16 weeks' treatment. Cardiac function was detected by echocardiography. Myocardial histopathology and collagen deposition were detected by HE and Masson staining. The protein expression levels o
f peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α) and fibronectin typeⅢ domain-containing protein 5 (FNDC5) in the myocardium were detected by Western blotting. The expression of FNDC5 in the myocardium was observed by immunohistochemical assay.
Results
2
Glucose tolerance and insulin tolerance were obviously injured in the ob/ob mice than the WT group (
P
<
0.05). In the ob/ob mice
no changes were found in diastolic left ventricular diameter (LVIDd)
systolic left ventricular diameter (LVIDs)
or ratio of velocity of early filling wave (E) to velocity of late filling wave due to atrial contraction (A) (
P
>
0.05)
or myocardial hypertrophy or collagen deposition
but notable decreases were found in short axis fractional shortening (FS) and ejection fraction (EF) (
P
<
0.05)
as well as the protein expression levels of PGC-1α and FNDC5 (
P
<
0.05). DHM treatment for 16 weeks could significantly reverse the above changes in the ob/ob mice (
P
<
0.05).
Conclusion
2
DHM ameliorates cardiac function in the ob/ob mice
which might be related to PGC-1α/FNDC5 signalling pathway.
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