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Endogenous Annexin-A1 Regulates Haematopoietic Stem Cell Mobilisation and Inflammatory Response Post Myocardial Infarction in Mice In Vivo.

Endogenous Annexin-A1 Regulates Haematopoietic Stem Cell Mobilisation and Inflammatory Response Post Myocardial Infarction in Mice In Vivo.
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Qin CX, Finlayson SB, Ai-Sharea A, Tate M, De Blasio MJ, Deo M, Rosli S, Prakoso D, Thomas CJ, Kiriazis H, Gould E, Yang YH, Morand EF, Perretti M, Murphy AJ, Du XJ, Gao XM, Ritchie RH,


Qin CX, Finlayson SB, Ai-Sharea A, Tate M, De Blasio MJ, Deo M, Rosli S, Prakoso D, Thomas CJ, Kiriazis H, Gould E, Yang YH, Morand EF, Perretti M, Murphy AJ, Du XJ, Gao XM, Ritchie RH, (click to view)

Qin CX, Finlayson SB, Ai-Sharea A, Tate M, De Blasio MJ, Deo M, Rosli S, Prakoso D, Thomas CJ, Kiriazis H, Gould E, Yang YH, Morand EF, Perretti M, Murphy AJ, Du XJ, Gao XM, Ritchie RH,

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Scientific reports 2017 11 307(1) 16615 doi 10.1038/s41598-017-16317-1
Abstract

Endogenous anti-inflammatory annexin-A1 (ANX-A1) plays an important role in preserving left ventricular (LV) viability and function after ischaemic insults in vitro, but its long-term cardioprotective actions in vivo are largely unknown. We tested the hypothesis that ANX-A1-deficiency exaggerates inflammation, haematopoietic stem progenitor cell (HSPC) activity and LV remodelling in response to myocardial ischaemia in vivo. Adult ANX – A1 -/- mice subjected to coronary artery occlusion exhibited increased infarct size and LV macrophage content after 24-48 h reperfusion compared with wildtype (WT) counterparts. In addition, ANX – A1 -/- mice exhibited greater expansion of HSPCs and altered pattern of HSPC mobilisation 8 days post-myocardial infarction, with increased circulating neutrophils and platelets, consistent with increased cardiac inflammation as a result of increased myeloid invading injured myocardium in response to MI. Furthermore, ANX – A1 -/- mice exhibited significantly increased expression of LV pro-inflammatory and pro-fibrotic genes and collagen deposition after MI compared to WT counterparts. ANX-A1-deficiency increased cardiac necrosis, inflammation, hypertrophy and fibrosis following MI, accompanied by exaggerated HSPC activity and impaired macrophage phenotype. These findings suggest that endogenous ANX-A1 regulates mobilisation and differentiation of HSPCs. Limiting excessive monocyte/neutrophil production may limit LV damage in vivo. Our findings support further development of novel ANX-A1-based therapies to improve cardiac outcomes after MI.

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