Abstract
Diabetic cardiomyopathy has been shown to promote hypertrophy, leading to heart failure. Recent studies have reported a correlation between diabetic cardiomyopathy and oxidative stress, suggesting that the accumulation of advanced glycation end products (AGEs) induces the production of reactive oxygen species (ROS). In a clinical setting, AGEs have been shown to increase the risk of cardiovascular disease; however, the relationship between AGEs and cardiac hypertrophy remains unclear. This study sought to identify the role of AGEs in cardiac hypertrophy by treating H9c2 cells with glyceraldehyde-derived AGEs (200 μg/ml) or H2O2 (50 μM) for 96 h. Our results demonstrate that AGEs significantly increased protein levels and cell size. These effects were effectively blocked with PD98059 (10 μM; MEK/ERK inhibitor) pretreatment, suggesting that AGEs caused cell hypertrophy via the MEK/ERK pathway. We then treated cells with AGEs and H2O2 for 0–120 min and employed the Odyssey infrared imaging system to detect MEK/ERK phosphorylation. Our results show that AGEs up-regulated MEK/ERK phosphorylation. However, this effect was blocked by NAC (5 mM; ROS inhibitor), indicating that AGEs regulate MEK/ERK phosphorylation via ROS. Our findings suggest that glyceraldehyde-derived AGEs are closely related to cardiac hypertrophy and further identify a molecular mechanism underlying the promotion of diabetic cardiomyopathy by AGEs.
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Abbreviations
- AGEs:
-
Advanced glycation end products
- BSA:
-
Bovine serum albumin
- DCFH-DA:
-
2′,7′-Dichlorodihydrofluorescein diacetate
- DM:
-
Diabetes mellitus
- FBS:
-
Fetal bovine serum
- HBSS:
-
Hanks balanced salt solution
- NAC:
-
N-acetyl-l-cysteine
- ROS:
-
Reactive oxygen species
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Ko, SY., Lin, IH., Shieh, TM. et al. Cell Hypertrophy and MEK/ERK Phosphorylation are Regulated by Glyceraldehyde-Derived AGEs in Cardiomyocyte H9c2 Cells. Cell Biochem Biophys 66, 537–544 (2013). https://doi.org/10.1007/s12013-012-9501-8
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DOI: https://doi.org/10.1007/s12013-012-9501-8