Serotonin activates MAP kinase and PI3K/Akt signaling pathways in prostate cancer cell lines
Abstract
This study was conducted to examine the effects of 5-HT on extracellular signal-regulated kinase 1/2 (Erk1/2) and Akt pathways in prostate cancer (PC) cells. PC cell lines PC-3, Du145, and LNCaP stimulated with 5-HT in the presence of MEK or PI3K inhibitors and 5-HT receptor subtype 1A antagonist were analyzed by Western blotting and immunofluorescence. The proliferation assay BrdU and Boyden chamber were used to determine proliferation and migration, respectively. 5-HT dose-dependently induced rapid activation of Erk1/2 in PC-3 and Du145 cells, whereas in LNCaP cells, Erk1/2 phosphorylation was slow and sustained for up to 18 h. Similarly, 5-HT induced phosphorylation of Akt within 1 hour of stimulation, however, Akt phosphorylation was more pronounced in Du145 cells compared with PC-3 or LNCaP cells. The action of 5-HT was inhibited to varying degrees by inhibitors of MAPK and PI3K as well as by a 5-HT receptor subtype 1A antagonist. In addition to proliferation, 5-HT induced migration of PC-3 and Du145 cells, which were alleviated by the aforementioned inhibitors. The effects of 5-HT on LNCaP cells appeared to be related to neuroendocrine-phenotype acquisition and chromogranin A and neuron specific enolase expression. This s...Continue Reading
References
The role of serotonin (5-hydroxytryptamine1A and 1B) receptors in prostate cancer cell proliferation
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