VEGF-A-induced chemotaxis of CD16+ monocytes is decreased secondary to lower VEGFR-1 expression.

Abstract:

BACKGROUND:Monocyte recruitment into the vessel wall is a crucial initial step in vascular repair, arteriogenesis and atherogenesis. Two distinct human monocyte subpopulations can be classified according to their CD14/16 surface expression, namely CD14++CD16-monocytes (CD16-mo) and CD14+CD16+ monocytes (CD16+mo). We investigated different functional properties of the two monocyte subsets. METHODS:CD16-/CD16+mo were isolated from human blood by an immunological selection. We assessed monocyte chemokinesis, chemotaxis, adhesion and Vascular-Endothelial Growth Factor (VEGF) receptor expression. Furthermore, generation of reactive oxygen species (ROS) as well as expression of antioxidant enzymes was investigated. RESULTS:Chemokinesis of CD16+mo was decreased compared to CD16-mo (p<0.01). Likewise, adhesion capacity of CD16+mo was weaker (p<0.05). CD16+mo chemotaxis towards the angiogenic ligands vascular endothelial growth factor-A (VEGF-A) and placenta growth factor-1 (PlGF-1) was reduced compared to CD16-mo. VEGFR-1 is the receptor for VEGF-A and PlGF-1 on monocytes. VEGFR-1 protein expression was lower in CD16+mo than in CD16-mo (p<0.05). The impaired VEGF-A- and PlGF-1-induced CD16+mo chemotaxis might therefore be attributed to the reduced VEGFR-1 expression. CD16+mo exhibited less spontaneous ROS production than CD16-mo. Additionally, the antioxidant enzyme manganese superoxide dismutase was expressed at higher levels in CD16+mo (p<0.05); this might partly explain the higher oxidative resistance of CD16+mo. CONCLUSION:These novel functional differences between CD16-mo and CD16+mo may predict different functional roles of both monocyte subsets in vascular repair, arteriogenesis and atherogenesis.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Czepluch FS,Olieslagers S,van Hulten R,Vöö SA,Waltenberger J

doi

10.1016/j.atherosclerosis.2011.01.004

subject

Has Abstract

pub_date

2011-04-01 00:00:00

pages

331-8

issue

2

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(11)00064-5

journal_volume

215

pub_type

杂志文章
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    authors: McLaughlin J,Middaugh J,Boudreau D,Malcom G,Parry S,Tracy R,Newman W

    更新日期:2005-08-01 00:00:00

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    pub_type: 临床试验,杂志文章,随机对照试验

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    pub_type: 杂志文章

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