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

作者：Fujisawa Takeshi; Wang Keqing^*; Niu Xi Lin; Egginton Stuart; Ahmad Shakil; Hewett Peter; Kontos Christopher D; Ahmed Asif^*

来源：Cardiovascular Research, 2017, 113(1): 81-89.

DOI：10.1093/cvr/cvw223

• Angiopoietin-1
• Atherosclerosis
• Monocytes

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.

• 出版日期2017-1