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Blood, 15 August 2001, Vol. 98, No. 4, pp. 1226-1230
PHAGOCYTES
Role of the liver in regulating numbers of circulating
neutrophils
Jialan Shi,
Gary E. Gilbert,
Yoshihiro Kokubo, and
Takashi Ohashi
From the Department of Medicine, Brigham and Women's
Hospital and Harvard Medical School, Boston, Massachusetts;
Department of Epidemiology, Department of Immunotherapeutics,
Tokyo Medical and Dental University, Tokyo, Japan.
Neutrophils (polymorphonuclear leukocytes [PMNs]) carry
potent destructive enzymes that can destroy invasive bacteria or damage normal tissue. PMNs have a half-life of only 6 hours in the blood, but
the details of this homeostasis are unknown. In a rat model of
endotoxemia, P-selectin was selectively up-regulated in hepatic sinusoids and veins where it was necessary for phagocytosis of PMNs by
Kupffer cells in the liver, as opposed to the spleen or the lungs.
Apoptotic PMNs appeared in the lungs and spleen only after inactivation
of Kupffer cells by gadolinium chloride (GdCl3). Blocking
of Fas protein reduced the number of apoptotic cells in the liver;
binding of annexin V to phosphatidylserine (PS) reduced the number of
PMNs phagocytosed by Kupffer cells. The results support a clearance
pathway in which apoptosis and phagocytosis are effected by Kupffer
cells after P-selectin-mediated sequestration.

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