Entry
Name
Cardiac muscle contraction - Mesocricetus auratus (golden hamster)
Description
Contraction of the heart is a complex process initiated by the electrical excitation of cardiac myocytes (excitation-contraction coupling, ECC). In cardiac myocytes, Ca2+ influx induced by activation of voltage-dependent L-type Ca channels (DHP receptors) upon membrane depolarization triggers the release of Ca2+ via Ca2+ release channels (ryanodine receptors) of sarcoplasmic reticulum (SR) through a Ca2+ -induced Ca release (CICR) mechanism. Ca2+ ions released via the CICR mechanism diffuse through the cytosolic space to contractile proteins to bind to troponinC resulting in the release of inhibition induced by troponinI. The Ca2+ binding to troponinC thereby triggers the sliding of thin and thick filaments, that is, the activation of a crossbridge and subsequent cardiac force development and/or cell shortening. Recovery occurs as Ca2+ is pumped out of the cell by the Na+/Ca2+ exchanger (NCX) or is returned to the sarcoplasmic reticulum (SR) by sarco(endo)plasmic Ca2+ -ATPase (SERCA) pumps on the non-junctional region of the SR.
Class
Organismal Systems; Circulatory system
BRITE hierarchy
Pathway map
Ortholog table
Other DBs
Organism
Mesocricetus auratus (golden hamster) [GN:
maua ]
Gene
101834428 Cacna1c; voltage-dependent L-type calcium channel subunit alpha-1C isoform X23 [KO:K04850 ]
101825756 Cacna1d; voltage-dependent L-type calcium channel subunit alpha-1D [KO:K04851 ]
101830198 Cacna1f; voltage-dependent L-type calcium channel subunit alpha-1F [KO:K04853 ]
101835763 Cacna1s; voltage-dependent L-type calcium channel subunit alpha-1S isoform X1 [KO:K04857 ]
101838500 Cacnb1; voltage-dependent L-type calcium channel subunit beta-1 isoform X1 [KO:K04862 ]
101825511 Cacnb2; voltage-dependent L-type calcium channel subunit beta-2 isoform X1 [KO:K04863 ]
101836179 Cacnb3; voltage-dependent L-type calcium channel subunit beta-3 isoform X3 [KO:K04864 ]
101844274 Cacnb4; voltage-dependent L-type calcium channel subunit beta-4 isoform X1 [KO:K04865 ]
101835530 Cacna2d1; voltage-dependent calcium channel subunit alpha-2/delta-1 isoform X1 [KO:K04858 ]
101827594 Cacna2d2; voltage-dependent calcium channel subunit alpha-2/delta-2 isoform X8 [KO:K04859 ]
101837712 Cacna2d3; LOW QUALITY PROTEIN: voltage-dependent calcium channel subunit alpha-2/delta-3 [KO:K04860 ]
101834159 Cacna2d4; voltage-dependent calcium channel subunit alpha-2/delta-4 isoform X1 [KO:K04861 ]
101838313 Cacng1; voltage-dependent calcium channel gamma-1 subunit [KO:K04866 ]
101822817 Cacng2; voltage-dependent calcium channel gamma-2 subunit isoform X1 [KO:K04867 ]
101828143 Cacng3; voltage-dependent calcium channel gamma-3 subunit isoform X1 [KO:K04868 ]
101838044 Cacng4; voltage-dependent calcium channel gamma-4 subunit [KO:K04869 ]
101837781 Cacng5; voltage-dependent calcium channel gamma-5 subunit isoform X1 [KO:K04870 ]
101835632 Cacng6; voltage-dependent calcium channel gamma-6 subunit isoform X1 [KO:K04871 ]
101835887 Cacng7; voltage-dependent calcium channel gamma-7 subunit [KO:K04872 ]
101827881 Cacng8; voltage-dependent calcium channel gamma-8 subunit [KO:K04873 ]
101823693 Hrc; sarcoplasmic reticulum histidine-rich calcium-binding protein [KO:K23450 ]
101822799 Tnnc1; troponin C, slow skeletal and cardiac muscles isoform X3 [KO:K05865 ]
101831072 Myl2; myosin regulatory light chain 2, ventricular/cardiac muscle isoform isoform X1 [KO:K10351 ]
121142591 LOW QUALITY PROTEIN: cytochrome b-c1 complex subunit 6, mitochondrial-like [KO:K00416 ]
121138131 LOW QUALITY PROTEIN: cytochrome b-c1 complex subunit 6, mitochondrial-like [KO:K00416 ]
101839655 cytochrome c oxidase subunit 4 isoform 1, mitochondrial [KO:K02263 ]
101844074 cytochrome c oxidase subunit 4 isoform 2, mitochondrial [KO:K02263 ]
101838803 LOW QUALITY PROTEIN: cytochrome c oxidase subunit 6A2, mitochondrial [KO:K02266 ]
106021169 LOW QUALITY PROTEIN: cytochrome c oxidase subunit 6C-2 [KO:K02268 ]
101837612 cytochrome c oxidase subunit 7A-related protein, mitochondrial isoform X1 [KO:K02270 ]
101828152 Atp1a3; LOW QUALITY PROTEIN: sodium/potassium-transporting ATPase subunit alpha-3 [KO:K01539 ] [EC:7.2.2.13 ]
101844313 Atp1a2; LOW QUALITY PROTEIN: sodium/potassium-transporting ATPase subunit alpha-2 [KO:K01539 ] [EC:7.2.2.13 ]
101828802 Atp1b1; sodium/potassium-transporting ATPase subunit beta-1 [KO:K01540 ]
101833660 Atp1b2; sodium/potassium-transporting ATPase subunit beta-2 [KO:K01540 ]
101836917 Atp1b3; sodium/potassium-transporting ATPase subunit beta-3 isoform X1 [KO:K01540 ]
106021095 Fxyd2; sodium/potassium-transporting ATPase subunit gamma isoform X1 [KO:K01538 ]
Compound
Reference
Authors
Bers DM
Title
Calcium cycling and signaling in cardiac myocytes.
Journal
Reference
Authors
Bers DM
Title
Cardiac excitation-contraction coupling.
Journal
Reference
Authors
Endoh M
Title
Signal transduction and Ca2+ signaling in intact myocardium.
Journal
Reference
Authors
Endoh M
Title
Cardiac Ca2+ signaling and Ca2+ sensitizers.
Journal
Reference
Authors
Bers DM, Despa S
Title
Cardiac myocytes Ca2+ and Na+ regulation in normal and failing hearts.
Journal
Reference
Authors
Gordon AM, Homsher E, Regnier M
Title
Regulation of contraction in striated muscle.
Journal
Reference
Authors
Phrommintikul A, Chattipakorn N
Title
Roles of cardiac ryanodine receptor in heart failure and sudden cardiac death.
Journal
Reference
Authors
Lacinova L
Title
Voltage-dependent calcium channels.
Journal
Gen Physiol Biophys 24 Suppl 1:1-78 (2005)
Reference
Authors
Lingrel J, Moseley A, Dostanic I, Cougnon M, He S, James P, Woo A, O'Connor K, Neumann J
Title
Functional roles of the alpha isoforms of the Na,K-ATPase.
Journal
Reference
Authors
Berg JS, Powell BC, Cheney RE
Title
A millennial myosin census.
Journal
Reference
Authors
Parmacek MS, Solaro RJ
Title
Biology of the troponin complex in cardiac myocytes.
Journal
Reference
Authors
Yamashita H, Sugiura S, Fujita H, Yasuda S, Nagai R, Saeki Y, Sunagawa K, Sugi H
Title
Myosin light chain isoforms modify force-generating ability of cardiac myosin by changing the kinetics of actin-myosin interaction.
Journal
Reference
Authors
Pritchard TJ, Kranias EG
Title
Junctin and the histidine-rich Ca2+ binding protein: potential roles in heart failure and arrhythmogenesis.
Journal
Reference
Authors
Landstrom AP, Dobrev D, Wehrens XHT
Title
Calcium Signaling and Cardiac Arrhythmias.
Journal
Related pathway
KO pathway
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