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Am. J. Respir. Crit. Care Med., Volume 163, Number 4, March 2001, 970-976

Interleukin-6 Changes Deformability of Neutrophils and Induces Their Sequestration in the Lung

TATSUSHI SUWA, JAMES C. HOGG, MARIA E. KLUT, JENNIFER HARDS, and STEPHAN F. van EEDEN

Pulmonary Research Laboratory, University of British Columbia, St. Paul's Hospital, Vancouver, British Columbia, Canada

Interleukin-6 (IL-6) is an important mediator of both the hepatic and the bone marrow components of the acute-phase response. Previous studies from our laboratory have shown that cells released into the circulation from the marrow preferentially sequester in the lung. The present study was designed to examine the mechanism of this sequestration using a single dose of recombinant human IL-6 to stimulate the marrow in rabbits. Marrow release was monitored by labeling polymorphonuclear leukocyte (PMN) precursors in the marrow with the thymidine analogue, 5'-bromo-2-deoxyuridine (BrdU), 24 h before IL-6 treatment. This treatment caused a neutrophilia that was associated with the increase of circulating BrdU- labeled PMN (PMNBrdU) and morphometric studies confirmed that PMNBrdU released from the marrow preferentially sequestered in the lung microvessels compared to unlabeled PMN. IL-6 treatment increases PMN F-actin content (p < 0.05) that was not due to cell activation by IL-6. In vitro studies show that IL-6 treatment decreased the deformability of circulating PMN (p < 0.05). These studies confirm that IL-6 treatment causes an accelerated release of PMN from the bone marrow and shows that these newly released PMN have high levels of F-actin, are less deformable, and preferentially sequester in lung microvessels.




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