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    Conditional Vascular Cell Adhesion Molecule 1 Deletion in Mice

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    Authors
    Koni, Pandelakis A.
    Joshi, Sunil K.
    Temann, Ulla-Angela
    Olson, Dian
    Burkly, Linda
    Flavell, Richard A.
    Issue Date
    2001-03-19
    URI
    http://hdl.handle.net/10675.2/553
    
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    Abstract
    We generated vascular cell adhesion molecule (VCAM)-1 “knock-in” mice and Cre recombinase transgenic mice to delete the VCAM-1 gene ( vcam-1 ) in whole mice, thereby overcoming the embryonic lethality seen with conventional vcam-1 –deficient mice. vcam-1 knock-in mice expressed normal levels of VCAM-1 but showed loss of VCAM-1 on endothelial and hematopoietic cells when interbred with a “TIE2Cre” transgene. Analysis of peripheral blood from conditional vcam-1– deficient mice revealed mild leukocytosis, including elevated immature B cell numbers. Conversely, the bone marrow (BM) had reduced immature B cell numbers, but normal numbers of pro-B cells. vcam-1 –deficient mice also had reduced mature IgD 1 B and T cells in BM and a greatly reduced capacity to support short-term migration of transferred B cells, CD4 1 T cells, CD8 1 T cells, and preactivated CD4 1 T cells to the BM. Thus, we report an until now unappreciated dominant role for VCAM-1 in lymphocyte homing to BM.
    Citation
    J Exp Med. 2001 Mar 19; 193(6):741-754
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