The Journal of Experimental Medicine
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© The Rockefeller University Press, 0022-1007/1997/1/165/ $5.00
The Journal of Experimental Medicine, Volume 185, Number 1, January 6, 1997 165-170


Brief Definitive Reports

Follicular Dendritic Cells Specifically Express the Long CR2/CD21 Isoform

Yong-Jun Liu*, Jiangchun Xu{ddagger}, Odette de Bouteiller*, Christi L. Parham{ddagger}, Géraldine Grouard*, Odile Djossou*, Blandine de Saint-Vis*, Serge Lebecque*, Jacques Banchereau*, and Kevin W. Moore{ddagger}

From * Schering-Plough, Laboratory for Immunological Research, 69571 Dardilly Cedex, France; and {ddagger} DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, California, 94304-1104

This paper describes an antibody (mAb 7D6) that specifically recognizes human follicular dendritic cells (FDCs). By expression cloning, a cDNA clone encoding for the long human CR2/ CD21 isoform (CD21L) that contains an additional exon (10a) was isolated. We demonstrated that FDCs selectively express CD21L, while B cells selectively express the short CR2/CD21 lacking exon 10a (CD21S). By screening mouse Ltk cells transfected with the CD21L cDNA, we further showed that the other two anti–human FDC mAbs DRC-1 and KiM4 also recognize CD21L. Thus, CD21L represents the first characterized human FDC-specific molecule, which may confer unique functions of FDCs in germinal center development.


Address correspondence to Dr Yong-Jun Liu, Schering-Plough, Laboratory for Immunological Research, 69571 Dardilly Cedex, France.

The present address of J. Xu is Corixa Corporation, Seattle, WA 88104.


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