Abstract
Melatonin is thought to have the ability of antiatherogenic, antioxidant, and vasodilatory. It is not only a promising protective in acute myocardial infarction but is also a useful tool in the treatment of pathological remodeling. However, its role in myocardial hypertrophy remains unclear. In this study, we investigated the protective effects of melatonin on myocardial hypertrophy induced by lipopolysaccharide (LPS) and to identify their precise mechanisms. The cultured myocardial cell was divided into six groups: control group, LPS group, LPS + ethanol (4%), LPS + melatonin (1.5 mg/ml) group, LPS + melatonin (3 mg/ml) group, and LPS + melatonin (6 mg/ml) group. The morphologic change of myocardial cell was observed by inverted phase contrast microscope. The protein level of myocardial cell was measured by Coomassie brilliant blue protein kit. The secretion level of tumor necrosis factor-α (TNF-α) was evaluated by enzyme-linked immunosorbent assay (ELISA). Ca2+ transient in Fura-2/AM-loaded cells was measured by Till image system. The expression of Ca2+/calmodulin-dependent kinase II (CaMKII) and calcineurin (CaN) was measured by Western blot analysis. Our data demonstrated that LPS induced myocardial hypertrophy, promoted the secretion levels of TNF-α, and increased Ca2+ transient level and the expression of CaMKII and CaN. Administration of melatonin 30 min prior to LPS stimulation dose-dependently attenuated myocardial hypertrophy. In conclusion, the results revealed that melatonin had the potential to protect against myocardial hypertrophy induced by LPS in vitro through downregulation of the TNF-α expression and retains the intracellular Ca2+ homeostasis.
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This study was supported by grants from the Innovation and demonstration of Nantong Social Science (S11954).
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Editor: T. Okamoto
Qi Lu and Xin Yi contributed equally to this study.
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Figure 1
The volume of myocardial cell in each group. Photomicrographs of myocardial cell cultured in each group were taken by inverted phase contrast microscope and analyzed for size of cells by CIAS Daheng image analysis system. The shape of myocardial cell was fusiform, irregular triangle or polygon (A). The volume of myocardial cell in TNF-α group and TNF-α+ethanol group was obviously augmented compared with control group. The volume of myocardial cell in TNF-α+melatonin group was smaller than that of TNF-αgroup and TNF-α+ethanol group and was similar to that of control group (A, B). ∆ p< 0.01, vs. control group; * p< 0.01, vs. TNF-αgroup; # p< 0.01, vs. TNF-α+ethanol group. (GIF 29 kb)
Figure 2
The protein level of myocardial cell in each group. The protein level of myocardial cell was measured by coomassie brilliant blue protein kit. The total protein level of myocardial cell in TNF-αgroup and TNF-α+ethanol group was more than that of control group and was was similar to that of control group. ∆ p< 0.01, vs. control group; * p< 0.01, vs. TNF-αgroup; # p< 0.01, vs. TNF-α+ethanol group. (GIF 10 kb)
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Lu, Q., Yi, X., Cheng, X. et al. Melatonin protects against myocardial hypertrophy induced by lipopolysaccharide. In Vitro Cell.Dev.Biol.-Animal 51, 353–360 (2015). https://doi.org/10.1007/s11626-014-9844-0
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DOI: https://doi.org/10.1007/s11626-014-9844-0