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- W2183652160 startingPage "F650" @default.
- W2183652160 abstract "Serotonin (5-HT) stimulates mitogenesis in rat renal mesangial cells through a G protein-coupled 5-HT(2A) receptor. We tested the hypothesis that oxidants might be involved in the signal transduction pathway linking the receptor to extracellular signal-regulated protein kinase (ERK). 5-HT rapidly increased the activity and phosphorylation of ERK. These effects were blocked by the 5-HT(2A) receptor antagonist ketanserin. The peak effect was noted at 5-10 min, and half-maximal stimulation was achieved at 10-30 nM 5-HT. Chemical inhibitor and activator studies supported the involvement of phospholipase C, protein kinase C (PKC), and reactive oxygen species (ROS, i.e., H(2)O(2) and superoxide) generated by an NAD(P)H oxidase-like enzyme in the ERK activation cascade. Mapping studies supported a location for the NAD(P)H oxidase enzyme and the ROS downstream from PKC. Our studies are most consistent with an ERK activation pathway as follows: 5-HT(2A) receptor --> G(q) protein --> phospholipase C --> diacylglycerol --> classical PKC --> NAD(P)H oxidase --> superoxide --> superoxide dismutase --> H(2)O(2) --> mitogen-activated extracellular signal-regulated kinase --> ERK. These studies demonstrate a role for the 5-HT(2A) receptor in rapid, potent, and efficacious activation of ERK in rat renal mesangial cells. They support a role for oxidants in conveying the stimulatory signal from 5-HT, because 1) chemical antioxidants attenuate the 5-HT signal, 2) oxidants and 5-HT selectively activate ERK to a similar degree, 3) 5-HT produces superoxide and H(2)O(2) in these cells, and 4) a specific enzyme [NAD(P)H oxidase] has been implicated as the source of the ROS, which react selectively downstream of classical PKC." @default.
- W2183652160 created "2016-06-24" @default.
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- W2183652160 date "2000-04-01" @default.
- W2183652160 modified "2023-09-26" @default.
- W2183652160 title "5-HT<sub>2A</sub>receptors stimulate mitogen-activated protein kinase via H<sub>2</sub>O<sub>2</sub>generation in rat renal mesangial cells" @default.
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- W2183652160 doi "https://doi.org/10.1152/ajprenal.2000.278.4.f650" @default.
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