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Serotonin activates angiogenic phosphorylation signaling in human endothelial cells
- Zamani, Ali, Qu, Zhican
- FEBS letters 2012 v.586 no.16 pp. 2360-2365
- G-protein coupled receptors, angiogenesis, endothelial cells, humans, phosphorylation, platelet aggregation, serotonin, signal transduction, therapeutics, vascular endothelial growth factors
- Serotonin, a known neurotransmitter, also functions as an angiokine to promote angiogenesis. The majority of serotonin in the human body is stored in platelets, and platelet aggregation leads to significant release of serotonin in thrombotic tumor environment. We have investigated serotonin signaling in human endothelial cells. Through G-protein-coupled receptors, serotonin at physiologically relevant concentrations activated Src/PI3K/AKT/mTOR/p70S6K phosphorylation signaling, and this activation was similar to that seen with VEGF. This finding provides insight into the overlapping angiogenic signaling pathways stimulated by serotonin in tumor environment, and suggests one of the mechanisms underlying resistance to current VEGF-targeting antiangiogenic therapy against cancer.