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. 1995 Jan 17;92(2):626–630. doi: 10.1073/pnas.92.2.626

Disregulation of leukosialin (CD43, Ly48, sialophorin) expression in the B-cell lineage of transgenic mice increases splenic B-cell number and survival.

L L Dragone 1, R K Barth 1, K L Sitar 1, G L Disbrow 1, J G Frelinger 1
PMCID: PMC42795  PMID: 7831340

Abstract

Leukosialin (also known as Ly48, CD43, and sialophorin) is a major cell surface sialoglycoprotein found on a variety of hematopoietically derived cells. The precise function of this molecule is poorly understood but it has been implicated in cell proliferation and intercellular adhesion. We developed a transgenic mouse model to assess leukosialin's function in vivo. Our approach was to alter mouse CD43 (mCD43) expression in the B-cell lineage where it is tightly regulated, by expressing it in peripheral B cells where it is normally absent. To drive expression of leukosialin in mature B cells, the immunoglobulin heavy chain enhancer was fused to the mCD43 gene. mCD43-immunoglobulin heavy chain enhancer transgenic mice display splenomegaly due to increased numbers of B cells. Transgenic B cells show a striking increase in their ability to survive in vitro compared to B cells from nontransgenic control mice. This prolonged survival is reflected in a decreased susceptibility to apoptosis. These observations suggest that mCD43 plays an important role in the regulation of B-cell survival. The alteration of the temporal expression, or "disregulation," of a gene in transgenic mice provides a general strategy for elucidating the in vivo role of other molecules involved in cell signaling and adhesion.

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Selected References

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