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The role of the bone marrow in neutrophil clearance under homeostatic conditions in the mouse
Author(s) -
Furze Rebecca C.,
Rankin Sara M.
Publication year - 2008
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fj.08-109876
Subject(s) - bone marrow , granulocyte , stromal cell , haematopoiesis , spleen , chemokine , chemistry , in vivo , clearance , immunology , myelopoiesis , biology , inflammation , medicine , pathology , microbiology and biotechnology , stem cell , urology
In humans, 10 11 neutrophils are released from the bone marrow per day, and these cells have a half‐life in the blood of only ~6.5 h. Although it is generally believed that neutrophils are cleared from the circulation via the liver and spleen, in this study using 111 In‐labeled senescent neutrophils, we show that in mice, 32% of neutrophils are cleared from the circulation via the bone marrow. We have previously shown that senescent neutrophils home to the bone marrow in a CXCR4‐dependent manner, and we show here that pretreatment of neutrophils with pertussis toxin significantly inhibits neutrophil clearance via the bone marrow (75%), consistent with a role for chemokines in this process. By labeling senescent neutrophils with inert fluorescent microspheres, we have tracked their fate and shown that in vivo, they are ultimately phagocytosed by bone marrow stromal macrophages. Finally, we show that under noninflammatory conditions, circulating levels of neutrophils are regulated by granulocyte‐colony stimulating factor (G‐CSF), but not interleukin‐17. Interestingly, we report that the uptake of apoptotic neutrophils by bone marrow macrophages stimulates their production of G‐CSF in vitro. Taken together, these data provide evidence that the bone marrow represents a major site of neutrophil clearance in mice.—Furze, R. C., Rankin, S. M. The role of the bone marrow in neutrophil clearance under homeostatic conditions in the mouse. FASEB J. 22, 3111–3119 (2008)