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T-type Ca(2+) channels facilitate NO-formation, vasodilatation and NO-mediated modulation of blood pressure

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Authors:
  • Svenningsen, Per ;
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    Orcid logo0000-0001-6590-7103
    Kardiovaskulær og Renal Forskning, Department of Molecular Medicine, Faculty of Health Sciences, SDU
  • Andersen, Kenneth ;
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    Kardiovaskulær og Renal Forskning, Department of Molecular Medicine, Faculty of Health Sciences, SDU
  • Thuesen, Anne D ;
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    Orcid logo0000-0001-5954-2689
    Kardiovaskulær og Renal Forskning, Department of Molecular Medicine, Faculty of Health Sciences, SDU
  • Shin, Hee-Sup ;
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    unknown
  • Vanhoutte, Paul M ;
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    Kardiovaskulær og Renal Forskning, Department of Molecular Medicine, Faculty of Health Sciences, SDU
  • Skøtt, Ole ;
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    Dean, Faculty of Health Sciences, Faculty Secretariat, Faculty of Health Sciences, SDU
  • Jensen, Boye L ;
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    Kardiovaskulær og Renal Forskning, Department of Molecular Medicine, Faculty of Health Sciences, SDU
  • Hill, Caryl ;
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    unknown
  • Hansen, Pernille B L
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    Kardiovaskulær og Renal Forskning, Department of Molecular Medicine, Faculty of Health Sciences, SDU
DOI:
10.1007/s00424-014-1492-4
Abstract:
Voltage-gated calcium channels are involved in the vascular excitation-contraction mechanism and regulation of arterial blood pressure. It was hypothesized that T-type channels promote formation of nitric oxide from the endothelium. The present experiments determine the involvement of T-type channels in depolarization-dependent dilatation of mesenteric arteries and blood pressure regulation in Cav3.1 knock-out mice. Nitric oxide-dependent vasodilatation following depolarization-mediated vasoconstriction was reduced significantly in mesenteric arteries from Cav3.1(-/-) compared to wild type mice. Four days of systemic infusion of a nitric oxide (NO)-synthase-inhibitor to conscious wild type elicited a significant increase in mean arterial blood pressure that was absent in Cav3.1(-/-) mice. Immunoprecipitation and immunofluorescence labeling showed co-localization of Cav3.1 and endothelial nitric oxide synthase (eNOS) in arteries from wild type mice. Nitric oxide release measured as DAF fluorescence and cGMP levels were significantly lower in depolarized Cav3.1(-/-) compared to wild type arteries. In summary, the absence of T-type Cav3.1 channels attenuates NO-dependent dilatation in mesenteric arteries in vitro, as well as the hypertension after L-NAME infusion in vivo. Furthermore, Cav3.1 channels cluster with eNOS and promote formation of nitric oxide by the endothelium. The present findings suggest that this mechanism is important for the systemic impact of NO on peripheral resistance.
Type:
Journal article
Language:
English
Published in:
Pflügers Archiv - European Journal of Physiology, 2014, Vol 466, Issue 12, p. 2205-2214
Main Research Area:
Medical science
Publication Status:
Published
Review type:
Peer Review
Submission year:
2014
Scientific Level:
Scientific
ID:
272721617

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