RGD Reference Report - cAMP-responsive element-binding protein (CREB)-regulated transcription coactivator 2 (CRTC2) promotes glucagon clearance and hepatic amino acid catabolism to regulate glucose homeostasis. - Rat Genome Database

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cAMP-responsive element-binding protein (CREB)-regulated transcription coactivator 2 (CRTC2) promotes glucagon clearance and hepatic amino acid catabolism to regulate glucose homeostasis.

Authors: Erion, DM  Kotas, ME  McGlashon, J  Yonemitsu, S  Hsiao, JJ  Nagai, Y  Iwasaki, T  Murray, SF  Bhanot, S  Cline, GW  Samuel, VT  Shulman, GI  Gillum, MP 
Citation: Erion DM, etal., J Biol Chem. 2013 May 31;288(22):16167-76. doi: 10.1074/jbc.M113.460246. Epub 2013 Apr 17.
RGD ID: 9685169
Pubmed: PMID:23595987   (View Abstract at PubMed)
PMCID: PMC3668772   (View Article at PubMed Central)
DOI: DOI:10.1074/jbc.M113.460246   (Journal Full-text)

cAMP-responsive element-binding protein (CREB)-regulated transcription coactivator 2 (CRTC2) regulates transcription of gluconeogenic genes by specifying targets for the transcription factor CREB in response to glucagon. We used an antisense oligonucleotide directed against CRTC2 in both normal rodents and in rodent models of increased gluconeogenesis to better understand the role of CRTC2 in metabolic disease. In the context of severe hyperglycemia and elevated hepatic glucose production, CTRC2 knockdown (KD) improved glucose homeostasis by reducing endogenous glucose production. Interestingly, despite the known role of CRTC2 in coordinating gluconeogenic gene expression, CRTC2 KD in a rodent model of type 2 diabetes resulted in surprisingly little alteration of glucose production. However, CRTC2 KD animals had elevated circulating concentrations of glucagon and a approximately 80% reduction in glucagon clearance. When this phenomenon was prevented with somatostatin or a glucagon-neutralizing antibody, endogenous glucose production was reduced by CRTC2 KD. Additionally, CRTC2 inhibition resulted in reduced expression of several glucagon-induced pyridoxal 5'-phosphate-dependent enzymes that convert amino acids to gluconeogenic intermediates, suggesting that it may control substrate availability as well as gluconeogenic gene expression. CRTC2 is an important regulator of gluconeogenesis with tremendous impact in models of elevated hepatic glucose production. Surprisingly, it is also part of a previously unidentified negative feedback loop that degrades glucagon and regulates amino acid metabolism to coordinately control glucose homeostasis in vivo.

RGD Manual Disease Annotations    Click to see Annotation Detail View

Objects Annotated

Genes (Rattus norvegicus)
Crtc2  (CREB regulated transcription coactivator 2)

Genes (Mus musculus)
Crtc2  (CREB regulated transcription coactivator 2)

Genes (Homo sapiens)
CRTC2  (CREB regulated transcription coactivator 2)


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