Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P08908 (5-HT1A)
 5,574 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

In the present study, effects of citalopram (CIT) on brain 5-hydroxytryptamine (5-HT) release in experimental chronic hepatic encephalopathy (HE) were investigated. Neocortical administration of CIT (1.0 microM) increased the brain 5-HT output to a similar extent in portacaval shunted (PCS) rats and sham-operated controls, indicating that a previous described mismatch between increased 5-HT turnover and unchanged release in PCS rats is not explained by an accelerated brain 5-HT reuptake. Subsequent systemic administration of CIT (5 mg/kg subcutaneously) resulted in a more pronounced attenuation of the brain 5-HT release in PCS rats than in sham-operated controls, possibly indicating a higher susceptibility to indirect mid-brain 5-HT1A autoreceptor activation in experimental portal-systemic encephalopathy (PSE). A KCl (60 mM) challenge in the presence of locally administered CIT (1 microM) induced a more marked neocortical 5-HT response in PCS rats than in sham-operated controls, confirming previous results of a higher than normal amount of 5-HT available for depolarization-induced release in PCS rats. Although the pharmacodynamic parameters in this study was investigated for CIT, the likelihood of a parallel pharmacokinetic alteration existing for this drug in the PCS condition also was indicated. It is thus suggested that otherwise generally safe central nervous system 5-HT-active drugs may represent a potential hazard in patients with liver failure with or without PSE.
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PMID:Effect of citalopram on brain serotonin release in experimental hepatic encephalopathy: implications for thymoleptic drug safety in liver insufficiency. 940 25

The pathogenesis of hepatic encephalopathy is unknown, but metabolic perturbations, including hyperammonaemia and increased brain turnover of serotonin (5-HT), have been identified. Possible alterations of 5-HT receptors in the brain have been rudimentarily studied. We therefore investigated the 5-HT1A, 5-HT1B and 5-HT2A receptor density in 18-22 different regions in the brain of portacaval shunted rats by means of radioligand binding with autoradiographical evaluation. The results revealed a decreased 5-HT1A receptor binding in seven serotonergic projection areas of the brain, and an increase in the nucleus accumbens, hypothalamus and subiculum. No changes in the raphe nuclei were observed. An increased 5-HT1B receptor binding was seen in five brain regions: basal ganglia, olfactorial regions, hippocampus, mid brain and thalamus. However, decreased binding was seen in three regions of cortical areas and hippocampus. The 5-HT2A receptor binding site density was essentially unaltered. These findings suggest that perturbations in the central serotonergic neurotransmission may play a functional role in chronic hepatic encephalopathy.
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PMID:Regional brain serotonin receptor changes in portacaval shunted rats. 959 19