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BRL-54443 is a potent agonist for 5-HT1E and 5HT1F receptors (pEC50 values= 8.5 and 8.6) with more than 30-fold selectivity against human cloned 5-HT1A and more than 50-fold selectivity against a range of other 5-HT and dopamine receptors. [1]

5-HT receptor is a G-protein coupled receptor for 5-hydroxytryptamine (serotonin) that found in nerve systems. It also functions as receptor for various alkaloids and psychoactive substances.

In studies using rat brain cortical membranes, BRL-54443 causes biphasic inhibition of total [3H]-5-HT. [1] In C57BL/6J mouse aortae, BRL 54443 leads to a contraction in the presence of Ketanserin (an antagonist of 5-HT2A and 5-HT2C receptors).[3]

In Sprague Dawley rats, automated locomotor activity is reduced by BRL- 54443 administration at doses of 3 and 5 mg/kg. [2] BRL-4443 also stimulates sniffing behavior in rats. [2] In a barostat study, the intragastric volume was monitored in sedated cats at constant pressure, BRL-54443 induces a dose-dependent intragastric volume increase. [4]

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