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- W2023001492 abstract "Insulin and estradiol share some of signaling pathways and regulate same target molecules exerting mostly beneficial cardiac effects. In order to study their cardiac interaction, ovariectomized female rats were treated with hormones, separately or simultaneously (20, 30 or 40 min before analysis), and the phosphorylations of protein kinase B (Akt), extracellular signal-regulated kinases 1 and 2 (ERK 1/2), endothelial nitric oxide synthase (eNOS) were analyzed, as well as the plasma membrane content of α2 subunit of Na+/K+-ATPase. Insulin, particularly, and estradiol stimulate Ser473 Akt phosphorylation. The combined treatment was stimulatory, but less than insulin alone was. The general increase of Thr308 Akt phosphorylation by insulin was stronger than at Ser473 and reduced in the presence of estradiol, which also stimulated this phosphorylation given alone. The estradiol induction of ERK 1/2 phosphorylation was inverted to the decrease by the combined treatment, while insulin had no effect. Only insulin increased the plasma membrane content of α2. Estradiol did increase the phosphorylation of eNOS, whereas the insulin effect was controversial. The effect of the combined treatment on target molecules was generally opposite to single hormone treatment. In summary, both hormones exerted an effect on Akt phosphorylation, but only estradiol stimulated ERK 1/2 phosphorylation. The α2 plasma membrane content was increased only by insulin, while estradiol increased eNOS phosphorylation more consistently. Finally, if these hormones were administered together, it seems that they disturb each other in having a full effect on cardiac Akt, ERK 1/2, and downstream effectors, eNOS and Na+/K+-ATPase." @default.
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- W2023001492 date "2011-03-01" @default.
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- W2023001492 title "Interference between insulin and estradiol signaling pathways in the regulation of cardiac eNOS and Na+/K+-ATPase" @default.
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- W2023001492 doi "https://doi.org/10.1016/j.ejphar.2011.01.016" @default.
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