Preferred Label : CK1/CDK5 Regulation Pathway;
NCIt synonyms : CK1 CDK5 Regulation Pathway;
NCIt related terms : Regulation of ck1/cdk5 by type 1 glutamate receptors;
Alternative definition : BIOCARTA: Cdk5 is a cyclin dependent protein kinase involved in dopaminergic signaling
in the neostriatal region of the brain. The role of cdk5 in dopamine responses occurs
through phosphorylation of DARPP-32. Casein kinase 1 (CK1) also regulates DARPP-32
phosphorylation and dopamine signaling. The phosphorylation of DARPP-32 by cdk5 reduced
dopamine signaling. Depending on its phosphorylation state, DARPP-32 inhibits either
protein phosphatase 1 (PP1) or PKA. The role of mGLUR1 in this process is supported
by the induction of cdk5 and CK1 activity by the mGLUR1 agonist DHPG and the subsequent
phosphorylation of DARPP-32 associated with DHPG treatment of nigrostriatal neurons.
CK-1 and Ckd5 inhibitors block the DHPG induced DARPP-32 phosphorylation. Dopamine
exerts a positive signal that increases dopamine response by reversing phosphorylation
of DARPP-32 at threonine-75. Dopamine initiates this pathway through activation of
the D1 dopamine receptor, a Gs coupled GPCR, elevating cAMP and activating PKA. PKA
activates protein phosphatase 2A (PP2A) which dephosphorylates DARPP-32 and increases
dopamine responsiveness. This also removes the inhibition of PKA by DARPP-32, forming
a positive feedback loop for further DARPP-32 inactivation by PKA. Activation of the
D2 dopamine receptor has the opposite effect, shifting the DARPP-32 population toward
the threonine-75 phosphorylated form. (This definition may be outdated - see the DesignNote.);
NCIt note : The BIOCARTA Definition (ALT_DEFINITION) for this pathway concept was provided by
BioCarta. This property was not created by, nor is it maintained by the NCI Thesaurus
staff. Additionally, BioCarta is no longer updating its pathway data; thus, the BIOCARTA
Definition might be outdated or inaccurate. Please see the Terms and Conditions for
Use at http://www.biocarta.com/.;
Biocarta ID : h_ck1Pathway;
Origin ID : C39031;
UMLS CUI : C1511443;
Semantic type(s)
has_gene_product_element
pathway_has_gene_element