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Molecular and Cellular Biology, May 2001, p. 3159-3165, Vol. 21, No. 9
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.9.3159-3165.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Generation and Analysis of Mice Lacking the
Chemokine Fractalkine
Donald N.
Cook,
Shu-Cheng
Chen,
Lee M.
Sullivan,
Denise J.
Manfra,
Maria T.
Wiekowski,
Dina M.
Prosser,
Galya
Vassileva, and
Sergio A.
Lira*
Department of Immunology, Schering-Plough
Research Institute, Kenilworth, New Jersey 07033
Received 25 October 2000/Returned for modification 8 January
2001/Accepted 29 January 2001
Fractalkine (CX3CL1) is the first described
chemokine that can exist either as a soluble protein or as a
membrane-bound molecule. Both forms of fractalkine can mediate
adhesion of cells expressing its receptor, CX3CR1. This
activity, together with its expression on endothelial cells, suggests
that fractalkine might mediate adhesion of leukocytes to
the endothelium during inflammation. Fractalkine is also highly
expressed in neurons, and its receptor, CX3CR1, is
expressed on glial cells. To determine the biologic role of
fractalkine, we used targeted gene disruption to generate fractalkine-deficient mice. These mice did not exhibit overt
behavioral abnormalities, and histologic analysis of their brains did
not reveal any gross changes compared to wild-type mice. In addition, these mice had normal hematologic profiles except for a decrease in the
number of blood leukocytes expressing the cell surface marker F4/80.
The cellular composition of their lymph nodes did not differ
significantly from that of wild-type mice. Similarly, the responses of
fractalkine
/
mice to a variety of
inflammatory stimuli were indistinguishable from those of wild-type mice.
*
Corresponding author. Mailing address: Department of
Immunology, Schering-Plough Research Institute, 2015 Galloping Hill
Rd., Kenilworth, NJ 07033. Phone: (908) 740-3088. Fax: (908) 740-3084. E-mail: sergio.lira{at}spcorp.com.

Present address: Division of Pulmonary and Critical Care Medicine,
Duke University Medical Center, Durham, NC
27710.
Molecular and Cellular Biology, May 2001, p. 3159-3165, Vol. 21, No. 9
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.9.3159-3165.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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