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 Blood, 15 October 2006, Vol. 108, No. 8, pp. 2821-2826.
Prepublished online as a Blood First Edition Paper on June 27, 2006; DOI 10.1182/blood-2006-04-018184.

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PHAGOCYTES

Timing of neutrophil tissue repopulation predicts restoration of innate immune protection in a murine bone marrow transplantation model

Chrisovalantou Cheretakis, Roland Leung, Chun Xiang Sun, Yigal Dror, and Michael Glogauer

From the Canadian Institutes of Health Research (CIHR) Group in Matrix Dynamics, University of Toronto; and the Department of Hematology/Oncology, Hospital for Sick Children, Toronto, ON, Canada.

It has been suggested that neutrophil tissue repopulation following bone marrow transplantation (BMT) serves as an earlier and more relevant marker of susceptibility to infection than circulating neutrophil counts. In a previous study using an oral rinse protocol, we found that oral neutrophil recovery always preceded blood neutrophil engraftment and that the day of oral neutrophil detection served as a predictor of patient susceptibility to infection after BMT. Consequently, we have developed and validated a mouse BMT model which uses bone marrow transplants containing enhanced green fluorescent protein-expressing neutrophils to follow neutrophil tissue repopulation after BMT. Using this in vivo cell migration model, we assessed the significance of neutrophil tissue recruitment kinetics with neutrophil functionality and in vivo bacterial killing after BMT. Using the animal model, we have demonstrated that protection against bacterial infection is conferred at the time of neutrophil tissue delivery, which always occurs before neutrophils are detected in the blood. We therefore conclude that neutrophil tissue recovery is an early measure of the restoration of cellular innate immune function after BMT. This model will help us better understand the factors regulating neutrophil recruitment to the tissues.


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Related Article in Blood Online:

Supplying neutrophils from the bone marrow to the tissues
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Blood 2006 108: 2503. [Full Text] [PDF]





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