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Dopamine receptor D5 : ウィキペディア英語版
Dopamine receptor D5

Dopamine receptor D5, also known as D1BR, is a protein that in humans is encoded by the ''DRD5'' gene. It belongs to the D1-like receptor family along with the D1 receptor subtype.
== Function ==

D5 receptor is a subtype of the dopamine receptor that has a 10-fold higher affinity for dopamine than the D1 subtype.〔 The D5 subtype is a G-protein coupled receptor, which promotes synthesis of cAMP by adenylyl cyclase via activation of s/olf family of G proteins. Both D5 and D1 subtypes activate adenylyl cyclase. D1 receptors were shown to stimulate monophasic dose-dependent accumulation of cAMP in response to dopamine, and the D5 receptors were able to stimulate biphasic accumulation of cAMP under the same conditions, suggesting that D5 receptors may use a different system of secondary messengers than D1 receptors.
Activation of D5 receptors is shown to promote expression of brain-derived neurotrophic factor and increase phosphorylation of protein kinase B in rat and mice prefrontal cortex neurons.
In vitro, D5 receptors show high constitutive activity that is independent of binding any agonists.

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