E-6837
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E-6837
E-6837 is an orally active, 5-HT6 agonist developed in an attempt to create an anti-obesity medication. In cell lines expressing rat 5-HT6 receptors, it acted as a partial agonist (on presumed silent receptors), while it acted as a full agonist on human 5-HT6 receptors (which are constitutively active). Oral administration of E-6837 reduced food intake, but only transiently. In rats, twice daily administration of E-6837 over the course of 4 weeks resulted in a 15.7% reduction in body weight, compared to 11% reduction for sibutramine. This weight loss remained significant for E-6837 after a 43-day withdrawal period, whereas the weight difference was non-significant for sibutramine (i.e., sibutramine had a rebound effect while E-6837 did not), and this weight loss was found to be due to a loss of fat mass. The reduction in fat mass in E-6837 treated animals was associated with a 50% decrease in plasma leptin levels, and also reduced glucose and insulin levels in plasma after a gluco ...
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5-HT6 Receptor
The 5HT6 receptor is a subtype of 5HT receptor that binds the endogenous neurotransmitter serotonin (5-hydroxytryptamine, 5HT). It is a G protein-coupled receptor (GPCR) that is coupled to Gs and mediates excitatory neurotransmission. ''HTR6'' denotes the human gene encoding for the receptor. Distribution The 5HT6 receptor is expressed almost exclusively in the brain. It is distributed in various areas including, but not limited to, the olfactory tubercle, cerebral cortex (frontal and entorhinal regions), nucleus accumbens, striatum, caudate nucleus, hippocampus, and the molecular layer of the cerebellum. Based on its abundance in extrapyramidal, limbic, and cortical regions it can be suggested that the 5HT6 receptor plays a role in functions like motor control, emotionality, cognition, and memory. Function Blockade of central 5HT6 receptors has been shown to increase glutamatergic and cholinergic neurotransmission in various brain areas, whereas activation enhances GA ...
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