Add time:09/08/2019 Source:sciencedirect.com
The effects of the tryptophan hydroxylase (TPH) inhibitor p-chlorophenylalanine (PCPA; 200 mg/kg; 3 days), and of the protein synthesis inhibitor cycloheximide (CXM, 2 mg/kg), on regional serotonin (5-HT) synthesis were studied using the α-[14C]methyl-l-tryptophan (α-[14C]MTrp) autoradiographic method. The objectives of these investigations were to evaluate the changes, if any, on 5-HT synthesis, as measured with α-MTrp method, following the inhibition of TPH by PCPA, or the inhibition of proteins synthesis by CXM. The rats were used in the tracer experiment approximately 24 h after the last dose of PCPA was administered, and in the CXM experiments, they were used 30 min following a single injection of CXM. In both experiments, the control rats were injected with the same volume of saline (0.5 ml/kg; s.c.) and at the same times as the drug injections. The results demonstrate that trapping of α-MTrp, which is taken to be related to brain 5-HT synthesis, is drastically reduced (40–80%) following PCPA treatment. The inhibition of protein synthesis with CXM did not have a significant effect on the global brain trapping of α-MTrp and 5-HT synthesis. These findings suggest that the brain trapping of α-[14C]MTrp relates to brain 5-HT synthesis, but not to brain protein synthesis.
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