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Arterioscler Thromb Vasc Biol. 2009 Nov;29(11):1794-801. doi: 10.1161/ATVBAHA.109.194019. Epub 2009 Sep 4.

Bone marrow-derived cell-specific chemokine (C-C motif) receptor-2 expression is required for arteriolar remodeling.

Author information

1
Department of Biomedical Engineering, University of Virginia, Charlottesville, VA 22908, USA.

Abstract

OBJECTIVE:

Bone marrow-derived cells (BMCs) and inflammatory chemokine receptors regulate arteriogenesis and angiogenesis. Here, we tested whether arteriolar remodeling in response to an inflammatory stimulus is dependent on BMC-specific chemokine (C-C motif) receptor 2 (CCR2) expression and whether this response involves BMC transdifferentiation into smooth muscle.

METHODS AND RESULTS:

Dorsal skinfold window chambers were implanted into C57Bl/6 wild-type (WT) mice, as well as the following bone marrow chimeras (donor-host): WT-WT, CCR2(-/-)-WT, WT-CCR2(-/-), and EGFP(+)-WT. One day after implantation, tissue MCP-1 levels rose from "undetectable" to 463 pg/mg, and the number of EGFP(+) cells increased more than 4-fold, indicating marked inflammation. A 66% (28 microm) increase in maximum arteriolar diameter was observed over 7 days in WT-WT mice. This arteriolar remodeling response was completely abolished in CCR2(-/-)-WT mice but largely rescued in WT-CCR2(-/-) mice. EGFP(+) BMCs were numerous throughout the tissue, but we found no evidence that EGFP(+) BMCs transdifferentiate into smooth muscle, based on examination of >800 arterioles and venules.

CONCLUSIONS:

BMC-specific CCR2 expression is required for injury/inflammation-associated arteriolar remodeling, but this response is not characterized by the differentiation of BMCs into smooth muscle.

PMID:
19734197
PMCID:
PMC2766019
DOI:
10.1161/ATVBAHA.109.194019
[Indexed for MEDLINE]
Free PMC Article

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