About: ChREBP Pathway

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Attributes	Values
rdf:type	Class
rdfs:label	ChREBP Pathway
rdfs:subClassOf	Regulatory Pathway
Semantic_Type	Functional Concept
Preferred_Name	ChREBP Pathway
UMLS_CUI	C1516440
BioCarta_ID	h_chrebpPathway
ALT_DEFINITION	Although insulin and glucagon play important roles in regulating the response of cells to nutrients, cells also respond to carbohydrates through transcriptional regulation by the glucose responsive transcription factor ChREBP. ChREBP, carbohydrate responsive element binding protein, is a transcription factor that is activated by high levels of carbohydrates and repressed by cAMP. The activation of ChREBP by elevated carbohydrate levels increases the activity of genes involved in glucose metabolism such as pyruvate kinase, a rate-limiting enzyme in glycolysis, increasing the overall rate of utilization of carbohydrates. Excess carbohydrates also increase the transcription of genes that convert carbohydrates to triglycerides in the liver for storage in adipose tissue. cAMP regulates ChREBP activity by activating PKA, which phosphorylates ChREBP. Phosphorylation of ChREBP at ser(196) inactivates nuclear import and phosphorylation at Thr(666) prevents DNA binding by ChREBP. A metabolite of glucose activates protein phosphatase PP2A that then dephosphorylates both sites on ChREBP in response to increased glucose levels and increases ChREBP activity. Other pathways also regulate ChREBP activity and response to nutrients. High fat diets repress ChREBP activation by increasing AMP in liver cells, activating the AMP kinase. Phosphorylation of ChREBP by AMP kinase inactivates ChREBP and blocks glucose induction of ChREBP, linking dietary fatty acids to the regulation of carbohydrate metabolism.BIOCARTA
Legacy_Concept_Name	ChREBP_Pathway
FULL_SYN	ChREBP PathwayPTNCI ChREBP regulation by carbohydrates and cAMPPTBIOCARTA
code	C39029
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