Annexin A1 regulates neutrophil clearance by macrophages in the mouse bone marrow
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
19/08/2013
19/08/2013
01/01/2012
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Resumo |
Under homeostatic conditions, a proportion of senescent CXCR4(hi) neutrophils home from the circulation back to the bone marrow, where they are phagocytosed by bone marrow macrophages. In this study, we have identified an unexpected role for the anti-inflammatory molecule annexin A1 (AnxA1) as a critical regulator of this process. We first observed that AnxA1(-/-) mice have significantly increased neutrophil numbers in their bone marrow while having normal levels of GM and G colony-forming units, monocytes, and macrophages. Although AnxA1(-/-) mice have more neutrophils in the bone marrow, a greater proportion of these cells are senescent, as determined by their higher levels of CXCR4 expression and annexin V binding. Consequently, bone marrow neutrophils from AnxA1(-/-) mice exhibit a reduced migratory capacity in vitro. Studies conducted in vitro also show that expression of AnxA1 is required for bone marrow macrophages, but not peritoneal macrophages, to phagocytose apoptotic neutrophils. Moreover, in vivo experiments indicate a defect in clearance of wild-type neutrophils in the bone marrow of AnxA1(-/-) mice. Thus, we conclude that expression of AnxA1 by resident macrophages is a critical determinant for neutrophil clearance in the bone marrow.-Dalli, J., Jones, C. P., Cavalcanti, D. M., Farsky, S. H., Perretti, M., Rankin, S. M. Annexin A1 regulates neutrophil clearance by macrophages in the mouse bone marrow. FASEB J. 26, 387-396 (2012). www.fasebj.org Wellcome Trust Wellcome Trust [086867/Z/08, 0851851/Z/08] William Harvey Research Foundation William Harvey Research Foundation National Institute for Health Research (UK) National Institute for Health Research (UK) |
Identificador |
FASEB JOURNAL, BETHESDA, v. 26, n. 1, supl. 1, Part 6, pp. 387-396, JAN, 2012 0892-6638 http://www.producao.usp.br/handle/BDPI/32617 10.1096/fj.11-182089 |
Idioma(s) |
eng |
Publicador |
FEDERATION AMER SOC EXP BIOL BETHESDA |
Relação |
FASEB JOURNAL |
Direitos |
closedAccess Copyright FEDERATION AMER SOC EXP BIOL |
Palavras-Chave | #CXCR4 #NEUTROPHIL HOMEOSTASIS #APOPTOTIC NEUTROPHILS #DEPENDENT PHAGOCYTOSIS #VITRONECTIN RECEPTOR #NULL MACROPHAGES #GENE-EXPRESSION #IN-VITRO #CELLS #INFLAMMATION #PHOSPHATIDYLSERINE #HETEROGENEITY #BIOCHEMISTRY & MOLECULAR BIOLOGY #BIOLOGY #CELL BIOLOGY |
Tipo |
article original article publishedVersion |