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• W2041502316 abstract "Deficits in serotonin (5-hydroxytryptamine, 5-HT) neurotransmission are implicated in abnormal emotional behaviors such as aggression, anxiety, and depression. However, the specific 5-HT receptor mechanisms involved are not well understood. The role of 5-HT2 receptors in fear potentiated startle, (FPS) was examined in rats chronically treated with pchlorophenylalanine (PCPA) to reduce brain 5-HT. PCPA-treated rats show an enhanced magnitude of FPS. Systemic administration of the 5-HT2 receptor agonist (±)-2,5-Dimethoxy-4-iodoamphetamine hydrochloride (DOI) reduced FPS in both PCPA-treated and saline (SAL)-treated control animals, normalizing the exaggerated fear response in PCPA-treated rats. In both SAL- and PCPA-treated animals, the DOI-induced reduction of learned fear was reversed by the 5-HT2 antagonist ketanserin, but not by the 5-HT2B/2C antagonist SB 206553. Together, these findings suggest 5-HT2A receptors are critical regulators of learned fear, and that 5-HT2A receptors may be an important pharmacological target to normalize exaggerated learned fear resulting from chronic 5-HT-ergic disruption." @default.
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• W2041502316 date "2012-01-01" @default.
• W2041502316 modified "2023-09-29" @default.
• W2041502316 title "5-HT&lt;sub&gt;2A&lt;/sub&gt; Receptor Activation Normalizes Exaggerated Fear Behavior in &lt;i&gt;p&lt;/i&gt;-Chlorophenylalanine (PCPA)-Treated Rats" @default.
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• W2041502316 doi "https://doi.org/10.4236/jbbs.2012.24053" @default.
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