Angiopoietin-1 promotes atherosclerosis by increasing the proportion of circulating Gr1+ monocytes.

Journal Article (Journal Article)

AIMS: Atherosclerosis is a chronic inflammatory disease occurring within the artery wall. A crucial step in atherogenesis is the infiltration and retention of monocytes into the subendothelial space of large arteries induced by chemokines and growth factors. Angiopoietin-1 (Ang-1) regulates angiogenesis and reduces vascular permeability and has also been reported to promote monocyte migration in vitro. We investigated the role of Ang-1 in atherosclerosis-prone apolipoprotein-E (Apo-E) knockout mouse. METHODS AND RESULTS: Apo-E knockout (Apo-E-/-) mice fed a western or normal chow diet received a single iv injection of adenovirus encoding Ang-1 or control vector. Adenovirus-mediated systemic expression of Ang-1 induced a significant increase in early atherosclerotic lesion size and monocyte/macrophage accumulation compared with control animals receiving empty vector. Ang-1 significantly increased plasma MCP-1 and VEGF levels as measured by ELISA. FACS analysis showed that Ang-1 selectively increased inflammatory Gr1+ monocytes in the circulation, while the cell-surface expression of CD11b, which mediates monocyte emigration, was significantly reduced. CONCLUSIONS: Ang-1 specifically increases circulating Gr1+ inflammatory monocytes and increases monocyte/macrophage retention in atherosclerotic plaques, thereby contributing to development of atherosclerosis.

Full Text

Duke Authors

Cited Authors

  • Fujisawa, T; Wang, K; Niu, X-L; Egginton, S; Ahmad, S; Hewett, P; Kontos, CD; Ahmed, A

Published Date

  • January 2017

Published In

Volume / Issue

  • 113 / 1

Start / End Page

  • 81 - 89

PubMed ID

  • 28069704

Pubmed Central ID

  • PMC5220674

Electronic International Standard Serial Number (EISSN)

  • 1755-3245

Digital Object Identifier (DOI)

  • 10.1093/cvr/cvw223


  • eng

Conference Location

  • England