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J. Biol. Chem., Vol. 278, Issue 42, 41282-41293, October 17, 2003
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From the
Department of Biochemistry and Molecular Biology and ¶Oklahoma Center for Medical Glycobiology, University of Oklahoma Health Sciences Center, and **The Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, Oklahoma 73104, the
School of Pharmaceutical Science of Ribeirão Preto-SP, University of São Paulo, Av. do Café sn 14015-900, São Paulo, Brazil, and the ||Department of Biochemistry, Cheju National University Medical School, Cheju 690-756, South Korea
We report that human galectin-1 (dGal-1), a small dimeric
-galactoside-binding protein, induces phosphatidylserine (PS) exposure, measured by Annexin V staining, on human promyelocytic HL-60 cells, T leukemic MOLT-4 cells, and fMet-Leu-Phe-activated, but not resting, human neutrophils. This effect of dGal-1 on HL-60 and MOLT-4 cells is enhanced by pretreatment of the cells with neuraminidase, but treatment of resting neutrophils with neuraminidase does not enhance their sensitivity to dGal-1. Although the induction of staining with Annexin V is often associated with apoptosis, the dGal-1-treated HL-60 cells, MOLT-4 cells, and activated neutrophils do not undergo apoptosis, and there is no detectable DNA fragmentation. HL-60 and MOLT-4 cells treated with dGal-1 continue to grow normally. By contrast, camptothecin-treated HL-60 cells, etoposide-treated MOLT-4 cells, and anti-Fas-treated neutrophils exhibit extensive DNA fragmentation and/or cell death. Lactose inhibits the dGal-1-induced effects, indicating that dGal-1-induced signaling requires binding to cell surface
-galactosides. The dimeric form of Gal-1 is required for signaling, because a monomeric mutant form of Gal-1, termed mGal-1, binds to cells but does not cause these effects. Importantly, dGal-1, but not mGal-1, treatment of HL-60 cells and activated human neutrophils significantly promotes their phagocytosis by activated mouse macrophages. These dGal-1-induced effects are distinguishable from apoptosis, but like apoptotic agents, prepare cells for phagocytic removal. Such effects of dGal-1 may contribute to leukocyte homeostasis.
Received for publication, June 23, 2003 , and in revised form, July 9, 2003.
* This work was supported by National Institutes of Health Grants AI48075 (to R. D. C.) and HL34363 and RR15577 (to R. P. M.). The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

To whom correspondence should be addressed: Dept. of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, 975 N.E. 10th St., BRC417, Oklahoma City, OK 73104. Tel.: 405-271-2481; Fax: 405-271-3910; E-mail: richard-cummings{at}ouhsc.edu.
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