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ATP2B1 Gene Silencing Increases NO Production Under Basal Conditions Through the Ca2+/calmodulin/eNOS Signaling

Yang Long1,2, Shao-Wei Chen3, Chen-Lin Gao2

  • 1Experimental Medicine Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, China.

Hypertension Research : Official Journal of the Japanese Society of Hypertension
|February 9, 2018
PubMed

Insights

Silencing the ATP2B1 gene increases nitric oxide (NO) production and endothelial nitric oxide synthase (eNOS) activity in human umbilical vein endothelial cells (HUVECs). This effect is mediated by elevated intracellular calcium levels and depends on the eNOS-calmodulin interaction.

Area of Science:

  • Cardiovascular Biology
  • Molecular Biology
  • Endothelial Cell Function

Background:

  • The ATP2B1 gene and its encoded protein PMCA1 are implicated in blood pressure regulation.
  • Mechanisms involving endothelial nitric oxide synthase (eNOS) activity and nitric oxide (NO) production are suggested but not fully understood.
  • The specific role of ATP2B1 in modulating eNOS and NO production requires further investigation.

Purpose of the Study:

  • To investigate the function of the ATP2B1 gene in regulating eNOS activity and NO production under basal conditions in HUVECs.
  • To elucidate the underlying molecular mechanisms, particularly the involvement of intracellular calcium and calmodulin.

Main Methods:

  • Gene silencing of ATP2B1 using siRNA in HUVECs.
  • Measurement of NO production and eNOS activity.
  • Quantification of intracellular calcium concentrations.
  • Pharmacological inhibition of calcium and calmodulin pathways using BAPTA-AM and W7.

Main Results:

  • ATP2B1 gene silencing led to increased NO production and eNOS activity in HUVECs.
  • Intracellular calcium concentrations were significantly enhanced in ATP2B1-silenced HUVECs.
  • The observed increase in eNOS activity was dependent on calcium/calmodulin signaling, confirmed by BAPTA-AM and W7 treatments.

Conclusions:

  • ATP2B1 gene silencing enhances basal NO production and eNOS activity in HUVECs.
  • This enhancement is mediated by increased intracellular calcium levels.
  • The eNOS-calmodulin interaction is crucial for the ATP2B1-dependent regulation of eNOS activity.

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