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- W2024305817 abstract "Expression of GSK-3α is increased in aging hearts and those subjected to hemodynamic overload. Overexpressed GSK-3α inhibits ERK and enhances pressure overload (PO)-induced cardiac dysfunction. We studied whether suppression of the MEK1/ERK pathway contributes to cardiac responses induced by overexpressed GSK-3α using constitutively active MEK1 (CA-MEK1)/GSK-3α bigenic mice (bigenic mice), which were obtained by crossing cardiac-specific GSK-3α transgenic mice (Tg-GSK) and cardiac-specific CA-MEK1 transgenic mice (Tg-MEK1). The suppression of ERK phosphorylation observed in Tg-GSK was eliminated in bigenic mice. At 12 mo, left ventricular (LV) weight/tibia length, LV weight/body weight, and cardiac myocyte size were significantly smaller in Tg-GSK than in nontransgenic mice (NTg), but were not significantly different between Tg-MEK1 and bigenic mice. The LV ejection fraction (LVEF), fractional shortening (FS), and change in pressure over time were significantly lower in Tg-GSK than in NTg, but were not significantly different between bigenic mice and Tg-MEK1. The increase in apoptosis in Tg-GSK was abolished in bigenic mice, although the increase in fibrosis was not. After PO, the decrease in cardiac hypertrophy and the enhancement of apoptosis seen in Tg-GSK were abrogated in bigenic mice. After PO, the LVEF and FS were significantly reduced in Tg-GSK compared with its sham, but not in NTg, Tg-MEK1, or bigenic mice compared with their respective shams. There was no significant difference in LVEF and FS between bigenic mice and Tg-MEK1 after PO. In conclusion, inhibition of the MEK1/ERK pathway mediates the hypertrophy suppression and cardiac dysfunction caused by GSK-3α overexpression in cardiac myocytes." @default.
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- W2024305817 date "2012-10-15" @default.
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- W2024305817 title "Constitutively active MEK1 rescues cardiac dysfunction caused by overexpressed GSK-3α during aging and hemodynamic pressure overload" @default.
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- W2024305817 doi "https://doi.org/10.1152/ajpheart.00415.2012" @default.
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