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Core 7: Vascular Disease: Biology and Clinical Science (Non-interventional)

Abstract 5536: Strain-dependent Susceptibility for Hypertension in Mice Resides in the Natural Killer Gene Complex

Zhila Taherzadeh, Ed VanBavel, Judith de Vos, Hanke Matlung, Gert van Montfrans, Lizzy Brewster, Leonard Seghers, Paul H.A. Quax, Erik N.T.P. Bakker
Circulation. 2009;120:S1111
Zhila Taherzadeh
Univ of Amsterdam, Amsterdam, Netherlands
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Ed VanBavel
Univ of Amsterdam, Amsterdam, Netherlands
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Judith de Vos
Univ of Amsterdam, Amsterdam, Netherlands
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Hanke Matlung
Univ of Amsterdam, Amsterdam, Netherlands
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Gert van Montfrans
Univ of Amsterdam, Amsterdam, Netherlands
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Lizzy Brewster
Univ of Amsterdam, Amsterdam, Netherlands
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Leonard Seghers
Leiden Univ Med Cntr, Leiden, Netherlands
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Paul H.A. Quax
Leiden Univ Med Cntr, Leiden, Netherlands
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Erik N.T.P. Bakker
Univ of Amsterdam, Amsterdam, Netherlands
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Abstract

Hypertension is accompanied by vascular remodeling and inflammation. We tested the hypothesis that the sensitivity to develop hypertension and vascular remodeling depends on the immunological background.

Methods: Blood pressure, vascular remodeling and expression of inflammatory cytokines were determined in mice with a genetically determined difference in immune background: C57BL/6 mice and BALB/c mice; and additionally BALB.B6-Cmv1r mice, a congenic strain where the natural killer (NK) gene complex of C57BL/6 mice is introduced in BALB/c background. Mice were treated for 4 weeks with L-NAME (NG-nitro-L-arginine methyl ester). Systemic and local inflammatory responses were quantified in spleen and mesenteric arteries respectively.

Results: L-NAME treatment induced a significant increase in mean arterial blood pressure in C57BL/6 mice, from 101±4 mmHg (n=7) to 154±5 mmHg (n=5, P<0.001). This was accompanied by a highly significant increase in vessel wall-to-lumen ratio, from 0.104±0.002 (n= 6) to 0.126±0.003 in L-NAME treated mice (n=6, P<0.001). In BALB/c mice the blood pressure (117±3 mmHg for untreated vs. 126±6 mmHg for L-NAME treated mice) and wall to lumen ratio (0.104±0.003 in untreated vs. 0.113±0.003 in L-NAME treated mice) were not altered after 4 weeks of L-NAME treatment. The congenic BALB.B6-Cmv1r mice showed a similar sensitivity to develop hypertension and vascular remodeling as C57Bl/6 mice: blood pressure increased from 111±11 mmHg to 155±7 mmHg (P<0.01). The wall to lumen ratio increased from 0.107±0.003 to 0.125±0.008 (P<0.05). Expression of inflammatory markers such as IFNγ, IL1, IL10 and CD68 (macrophages) was similar in C57BL/6 and BALB/c, with exception of CD11b, which increased in vessels of C57BL/6 mice only. Confocal microscopy showed that CD11b co-localized with NK1.1, and reflected the recruitment of natural killer cells in C57BL/6 mice.

Conclusions: These data show that vascular remodeling and hypertension are strain dependent. We have identified the NK gene complex as important determinant in the genetically determined sensitivity to develop hypertension in mice.

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Circulation
November 3, 2009, Volume 120, Issue Suppl 18
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    Abstract 5536: Strain-dependent Susceptibility for Hypertension in Mice Resides in the Natural Killer Gene Complex
    Zhila Taherzadeh, Ed VanBavel, Judith de Vos, Hanke Matlung, Gert van Montfrans, Lizzy Brewster, Leonard Seghers, Paul H.A. Quax and Erik N.T.P. Bakker
    Circulation. 2009;120:S1111, originally published January 5, 2016

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    Abstract 5536: Strain-dependent Susceptibility for Hypertension in Mice Resides in the Natural Killer Gene Complex
    Zhila Taherzadeh, Ed VanBavel, Judith de Vos, Hanke Matlung, Gert van Montfrans, Lizzy Brewster, Leonard Seghers, Paul H.A. Quax and Erik N.T.P. Bakker
    Circulation. 2009;120:S1111, originally published January 5, 2016
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