Preferred Label : Protein Kinase C Activation Pathway;
NCIt related terms : Activation of PKC through G protein coupled receptor;
Alternative definition : BIOCARTA: G-protein coupled receptors (GPCRs) transduce a variety of signals from
the extracellular environment across the plasma membrane. One of the common signaling
systems utilized by GPCRs activates protein kinase C (PKC), a ubiquitous family of
serine/threonine protein kinases. The pathway leading to PKC activation starts with
a class of GPCRs that interact with and activate Gq G-proteins when the receptor has
agonist ligand bound. GPCRs that act through Gq include some muscarinic acetylcholine
receptors, many peptide receptors, and the 5-HT2 serotonin receptors. Activated Gq
with GTP bound activates its downstream target phospholipase C (PLC) to hydrolyze
the membrane lipid PIP2, producing IP3 and diacylglycerol (DAG). IP3 is water-soluble
and diffuses through the cytoplasm to the ER, where it binds to and opens a calcium
channel, releasing calcium stores from inside the ER into the cytoplasm. Calcium alters
many cellular processes, in part by binding to regulatory proteins such as calmodulin
and calcineurin. The interaction of both DAG and calcium with PKC activates its kinase
activity and the phosphorylation of many different protein targets alters their activity.
The involvement of PKC in cellular proliferation and the cell cycle is indicated by
the activity of tumor promoters like phorbol esters as PKC activators. (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may be outdated - see the DesignNote.);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Definition might be outdated or inaccurate.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_pkcPathway;
Origin ID : C39190;
UMLS CUI : C1514554;
Semantic type(s)
has_gene_product_element
pathway_has_gene_element