Entry
Name
Insulin secretion - Loxodonta africana (African savanna elephant)
Description
Pancreatic beta cells are specialised endocrine cells that continuously sense the levels of blood sugar and other fuels and, in response, secrete insulin to maintain normal fuel homeostasis. Glucose-induced insulin secretion and its potentiation constitute the principal mechanism of insulin release. Glucose is transported by the glucose transporter (GLUT) into the pancreatic beta-cell. Metabolism of glucose generates ATP, which inhibits ATP-sensitive K+ channels and causes voltage-dependent Ca2+ influx. Elevation of [Ca2+]i triggers exocytotic release of insulin granules. Insulin secretion is further regulated by several hormones and neurotransmitters. Peptide hormones, such as glucagon-like peptide 1 (GLP-1), increase cAMP levels and thereby potentiate insulin secretion via the combined action of PKA and Epac2. Achetylcholine (ACh), a major parasympathetic neurotransmitter, binds to Gq-coupled receptors and activates phospholipase C- (PLC-), and the stimulatory effects involve activation of protein kinase C (PKC), which stimulates exocytosis. In addition, ACh mobilizes intracellular Ca2+ by activation of IP3 receptors.
Class
Organismal Systems; Endocrine system
BRITE hierarchy
Pathway map
Ortholog table
Other DBs
Organism
Loxodonta africana (African savanna elephant) [GN:
lav ]
Gene
100677089 SLC2A1; solute carrier family 2, facilitated glucose transporter member 1 [KO:K07299 ]
100669209 SLC2A2; solute carrier family 2, facilitated glucose transporter member 2 [KO:K07593 ]
100671543 TRPM4; LOW QUALITY PROTEIN: transient receptor potential cation channel subfamily M member 4 [KO:K04979 ]
100668326 ATP1A3; LOW QUALITY PROTEIN: sodium/potassium-transporting ATPase subunit alpha-3 [KO:K01539 ] [EC:7.2.2.13 ]
100655666 ATP1B3; sodium/potassium-transporting ATPase subunit beta-3 [KO:K01540 ]
100676526 ATP1B1; sodium/potassium-transporting ATPase subunit beta-1 [KO:K01540 ]
100668753 ATP1B2; sodium/potassium-transporting ATPase subunit beta-2 [KO:K01540 ]
111752838 FXYD2; sodium/potassium-transporting ATPase subunit gamma [KO:K01538 ]
100660003 ABCC8; ATP-binding cassette sub-family C member 8 isoform X2 [KO:K05032 ]
100671185 KCNJ11; ATP-sensitive inward rectifier potassium channel 11 isoform X1 [KO:K05004 ]
100659992 CACNA1D; LOW QUALITY PROTEIN: voltage-dependent L-type calcium channel subunit alpha-1D [KO:K04851 ]
100674649 CACNA1F; LOW QUALITY PROTEIN: voltage-dependent L-type calcium channel subunit alpha-1F [KO:K04853 ]
100673089 CACNA1S; LOW QUALITY PROTEIN: voltage-dependent L-type calcium channel subunit alpha-1S [KO:K04857 ]
100653927 CAMK2G; calcium/calmodulin-dependent protein kinase type II subunit gamma isoform X1 [KO:K04515 ] [EC:2.7.11.17 ]
100663321 CAMK2D; calcium/calmodulin-dependent protein kinase type II subunit delta isoform X2 [KO:K04515 ] [EC:2.7.11.17 ]
100656201 KCNMA1; calcium-activated potassium channel subunit alpha-1 isoform X6 [KO:K04936 ]
100675383 KCNU1; LOW QUALITY PROTEIN: potassium channel subfamily U member 1 [KO:K05274 ]
100663278 KCNMB1; calcium-activated potassium channel subunit beta-1 [KO:K04937 ]
100658510 KCNMB2; calcium-activated potassium channel subunit beta-2 [KO:K04938 ]
100657662 KCNMB3; calcium-activated potassium channel subunit beta-3 isoform X3 [KO:K04939 ]
100668504 KCNMB4; calcium-activated potassium channel subunit beta-4 [KO:K04941 ]
100673007 KCNN1; small conductance calcium-activated potassium channel protein 1 isoform X1 [KO:K04942 ]
100663280 small conductance calcium-activated potassium channel protein 2 isoform X1 [KO:K04943 ]
100677291 KCNN3; small conductance calcium-activated potassium channel protein 3 isoform X2 [KO:K04944 ]
100657419 KCNN4; intermediate conductance calcium-activated potassium channel protein 4 [KO:K04945 ]
100662363 ADCYAP1; pituitary adenylate cyclase-activating polypeptide [KO:K05262 ]
100677150 ADCYAP1R1; pituitary adenylate cyclase-activating polypeptide type I receptor isoform X2 [KO:K04587 ]
100655206 guanine nucleotide-binding protein G(s) subunit alpha isoform X1 [KO:K04632 ]
100675162 CREB1; cyclic AMP-responsive element-binding protein 1 isoform X1 [KO:K05870 ]
100657989 ATF2; cyclic AMP-dependent transcription factor ATF-2 isoform X1 [KO:K04450 ]
100662521 ATF4; cyclic AMP-dependent transcription factor ATF-4 isoform X2 [KO:K04374 ]
100653565 CREB3L1; cyclic AMP-responsive element-binding protein 3-like protein 1 [KO:K09048 ]
100673694 CREB3L4; cyclic AMP-responsive element-binding protein 3-like protein 4 [KO:K09048 ]
100666211 CREB3L2; cyclic AMP-responsive element-binding protein 3-like protein 2 [KO:K09048 ]
100670574 CREB3L3; cyclic AMP-responsive element-binding protein 3-like protein 3 [KO:K09048 ]
100677344 CREB3; cyclic AMP-responsive element-binding protein 3 isoform X1 [KO:K09048 ]
100675079 CREB5; cyclic AMP-responsive element-binding protein 5 isoform X1 [KO:K09047 ]
100666885 ATF6B; cyclic AMP-dependent transcription factor ATF-6 beta isoform X2 [KO:K09049 ]
100667513 PDX1; LOW QUALITY PROTEIN: pancreas/duodenum homeobox protein 1 [KO:K07594 ]
100653733 RIMS2; LOW QUALITY PROTEIN: regulating synaptic membrane exocytosis protein 2 [KO:K15297 ]
100656672 GNAQ; guanine nucleotide-binding protein G(q) subunit alpha isoform X1 [KO:K04634 ]
100670617 PLCB4; 1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase beta-4 isoform X3 [KO:K05858 ] [EC:3.1.4.11 ]
100672435 PLCB1; LOW QUALITY PROTEIN: 1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase beta-1 [KO:K05858 ] [EC:3.1.4.11 ]
100668575 PLCB2; LOW QUALITY PROTEIN: 1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase beta-2 [KO:K05858 ] [EC:3.1.4.11 ]
100663829 PLCB3; 1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase beta-3 isoform X1 [KO:K05858 ] [EC:3.1.4.11 ]
100659666 ITPR3; LOW QUALITY PROTEIN: inositol 1,4,5-trisphosphate receptor type 3 [KO:K04960 ]
100672461 VAMP2; vesicle-associated membrane protein 2 isoform X1 [KO:K13504 ]
100661719 SNAP25; synaptosomal-associated protein 25 isoform X1 [KO:K18211 ]
Compound
C01245 D-myo-Inositol 1,4,5-trisphosphate
Reference
Authors
Seino S, Shibasaki T, Minami K
Title
Pancreatic beta-cell signaling: toward better understanding of diabetes and its treatment.
Journal
Reference
Authors
Jitrapakdee S, Wutthisathapornchai A, Wallace JC, MacDonald MJ
Title
Regulation of insulin secretion: role of mitochondrial signalling.
Journal
Reference
Authors
Rorsman P, Braun M
Title
Regulation of insulin secretion in human pancreatic islets.
Journal
Reference
Authors
Jones PM, Persaud SJ
Title
Protein kinases, protein phosphorylation, and the regulation of insulin secretion from pancreatic beta-cells.
Journal
Reference
Authors
MacDonald PE
Title
Signal integration at the level of ion channel and exocytotic function in pancreatic beta-cells.
Journal
Reference
Authors
Lang J
Title
Molecular mechanisms and regulation of insulin exocytosis as a paradigm of endocrine secretion.
Journal
Reference
Authors
Kieffer TJ, Habener JF
Title
The glucagon-like peptides.
Journal
Reference
Authors
Girard J
Title
The incretins: from the concept to their use in the treatment of type 2 diabetes. Part A: incretins: concept and physiological functions.
Journal
Reference
Authors
Holz GG
Title
New insights concerning the glucose-dependent insulin secretagogue action of glucagon-like peptide-1 in pancreatic beta-cells.
Journal
Reference
Authors
Holst JJ, Gromada J
Title
Role of incretin hormones in the regulation of insulin secretion in diabetic and nondiabetic humans.
Journal
Reference
Authors
Doyle ME, Egan JM
Title
Mechanisms of action of glucagon-like peptide 1 in the pancreas.
Journal
Reference
Authors
Kim W, Egan JM
Title
The role of incretins in glucose homeostasis and diabetes treatment.
Journal
Reference
Authors
Seino S, Takahashi H, Fujimoto W, Shibasaki T
Title
Roles of cAMP signalling in insulin granule exocytosis.
Journal
Reference
Authors
Tengholm A
Title
Cyclic AMP dynamics in the pancreatic beta-cell.
Journal
Reference
Authors
Holz GG
Title
Epac: A new cAMP-binding protein in support of glucagon-like peptide-1 receptor-mediated signal transduction in the pancreatic beta-cell.
Journal
Reference
Authors
Gloerich M, Bos JL
Title
Epac: defining a new mechanism for cAMP action.
Journal
Reference
Authors
Bos JL
Title
Epac proteins: multi-purpose cAMP targets.
Journal
Reference
Authors
Filipsson K, Kvist-Reimer M, Ahren B
Title
The neuropeptide pituitary adenylate cyclase-activating polypeptide and islet function.
Journal
Reference
Authors
Kebede MA, Alquier T, Latour MG, Poitout V
Title
Lipid receptors and islet function: therapeutic implications?
Journal
Reference
Authors
Morgan NG, Dhayal S
Title
G-protein coupled receptors mediating long chain fatty acid signalling in the pancreatic beta-cell.
Journal
Related pathway
KO pathway
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