Entry
Name
Vascular smooth muscle contraction
Description
The vascular smooth muscle cell (VSMC) is a highly specialized cell whose principal function is contraction. On contraction, VSMCs shorten, thereby decreasing the diameter of a blood vessel to regulate the blood flow and pressure.
The principal mechanisms that regulate the contractile state of VSMCs are changes in cytosolic Ca2+ concentration ([Ca2+]c). In response to vasoconstrictor stimuli, Ca2+ is mobilized from intracellular stores and/or the extracellular space to increase [Ca2+]c in VSMCs. The increase in [Ca2+]c, in turn, activates the Ca2+-CaM-MLCK pathway and stimulates MLC20 phosphorylation, leading to myosin-actin interactions and, hence, the development of contractile force. The sensitivity of contractile myofilaments or MLC20 phosphorylation to Ca2+ can be secondarily modulated by other signaling pathways. During receptor stimulation, the contractile force is greatly enhanced by the inhibition of myosin phosphatase. Rho/Rho kinase, PKC, and arachidonic acid have been proposed to play a pivotal role in this enhancement.
The signaling events that mediate relaxation include the removal of a contractile agonist (passive relaxation) and activation of cyclic nucleotide-dependent signaling pathways in the continued presence of a contractile agonist (active relaxation). Active relaxation occurs through the inhibition of both Ca2+ mobilization and myofilament Ca2+ sensitivity in VSMCs.
Class
Organismal Systems; Circulatory system
BRITE hierarchy
Pathway map
ko04270 Vascular smooth muscle contraction
Drug
Other DBs
Orthology
K04135 ADRA1A; adrenergic receptor alpha-1A
K04136 ADRA1B; adrenergic receptor alpha-1B
K04137 ADRA1D; adrenergic receptor alpha-1D
K04166 AGTR1; angiotensin II receptor type 1
K04197 EDNRA; endothelin receptor type A
K04226 AVPR1A; arginine vasopressin receptor 1A
K04227 AVPR1B; arginine vasopressin receptor 1B
K04263 PTGIR; prostacyclin receptor
K04266 ADORA2A, ADOR; adenosine receptor A2a
K04267 ADORA2B; adenosine receptor A2b
K04346 GNA12; guanine nucleotide-binding protein subunit alpha-12
K04365 BRAF; B-Raf proto-oncogene serine/threonine-protein kinase [EC:2.7.11.1 ]
K04366 RAF1; RAF proto-oncogene serine/threonine-protein kinase [EC:2.7.11.1 ]
K04368 MAP2K1, MEK1; mitogen-activated protein kinase kinase 1 [EC:2.7.12.2 ]
K04369 MAP2K2, MEK2; mitogen-activated protein kinase kinase 2 [EC:2.7.12.2 ]
K04513 RHOA; Ras homolog gene family, member A
K04577 CALCRL; calcitonin receptor-like
K04632 GNAS; guanine nucleotide-binding protein G(s) subunit alpha
K04634 GNAQ; guanine nucleotide-binding protein G(q) subunit alpha
K04635 GNA11; guanine nucleotide-binding protein subunit alpha-11
K04639 GNA13; guanine nucleotide-binding protein subunit alpha-13
K04850 CACNA1C, CAV1.2; voltage-dependent calcium channel L type alpha-1C
K04851 CACNA1D, CAV1.3; voltage-dependent calcium channel L type alpha-1D
K04853 CACNA1F, CAV1.4; voltage-dependent calcium channel L type alpha-1F
K04857 CACNA1S, CAV1.1; voltage-dependent calcium channel L type alpha-1S
K04936 KCNMA1, KCA1.1; potassium large conductance calcium-activated channel subfamily M alpha member 1
K04937 KCNMB1; potassium large conductance calcium-activated channel subfamily M beta member 1
K04938 KCNMB2; potassium large conductance calcium-activated channel subfamily M beta member 2
K04939 KCNMB3; potassium large conductance calcium-activated channel subfamily M beta member 3
K04941 KCNMB4; potassium large conductance calcium-activated channel subfamily M beta member 4
K04958 ITPR1; inositol 1,4,5-triphosphate receptor type 1
K04959 ITPR2; inositol 1,4,5-triphosphate receptor type 2
K04960 ITPR3; inositol 1,4,5-triphosphate receptor type 3
K05242 AVP; arginine vasopressin
K05274 KCNMA3, KCNU1, KCA5.1; potassium large conductance calcium-activated channel subfamily M alpha member 3
K06269 PPP1C; serine/threonine-protein phosphatase PP1 catalytic subunit [EC:3.1.3.16 ]
K06270 PPP1R12A, MYPT1; protein phosphatase 1 regulatory subunit 12A
K07532 ARHGEF12, LARG; Rho guanine nucleotide exchange factor 12
K08447 RAMP1; receptor activity modifying protein 1
K08448 RAMP2; receptor activity modifying protein 2
K08449 RAMP3; receptor activity modifying protein 3
K08845 ARAF, ARAF1; A-Raf proto-oncogene serine/threonine-protein kinase [EC:2.7.11.1 ]
K09821 AGT, SERPINA8; angiotensinogen
K10352 MYH9s; myosin heavy chain 9/10/11/14
K12313 ACTA2; actin, aortic smooth muscle
K12315 ACTG2; actin, gamma-enteric smooth muscle
K12318 GUCY1A; guanylate cyclase soluble subunit alpha [EC:4.6.1.2 ]
K12319 GUCY1B; guanylate cyclase soluble subunit beta [EC:4.6.1.2 ]
K12323 ANPRA, NPR1; atrial natriuretic peptide receptor A [EC:4.6.1.2 ]
K12324 ANPRB, NPR2; atrial natriuretic peptide receptor B [EC:4.6.1.2 ]
K12328 PPP1R14A, CPI17; protein phosphatase 1 regulatory subunit 14A
K12329 PPP1R12B, MYPT2; protein phosphatase 1 regulatory subunit 12B
K12330 ARHGEF1; Rho guanine nucleotide exchange factor 1
K12331 ARHGEF11; Rho guanine nucleotide exchange factor 11
K12334 NPPA; natriuretic peptide A
K12335 NPPB; natriuretic peptide B
K12336 NPPC; natriuretic peptide C
K12337 MRVI1, IRAG; inositol 1,4,5-triphosphate receptor-associated cGMP kinase substrate
K12751 MYL6; myosin light chain 6
K12755 MYL9; myosin regulatory light chain 9
K16343 PLA2G6, IPLA2; calcium-independent phospholipase A2 [EC:3.1.1.4 ]
K17457 PPP1R12C, MBS85; protein phosphatase 1 regulatory subunit 12C
Compound
C01245 D-myo-Inositol 1,4,5-trisphosphate
Reference
Authors
Akata T
Title
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Title
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Title
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Title
Regulation of myosin phosphorylation and myofilament Ca2+ sensitivity in vascular smooth muscle.
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Reference
Authors
Freeman EJ, Ruehr ML, Dorman RV
Title
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Reference
Authors
Murphy TV, Spurrell BE, Hill MA
Title
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Journal
Related pathway
ko00590 Arachidonic acid metabolism