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Prepublished online as a Blood First Edition Paper on July 5, 2002; DOI 10.1182/blood-2002-02-0638.

Submitted March 1, 2002
Accepted June 13, 2002
Subtractive hybridization reveals the expression of immunoglobulin-like transcript 7, Eph-B1, granzyme B, and three novel transcripts in human plasmacytoid dendritic cells
Marie-Clotilde Rissoan, Thomas Duhen, Jean-Michel Bridon, Nathalie Bendriss-Vermare, Catherine Peronne, Blandine de Saint Vis, Francine Briere*, and Elizabeth E Bates
Laboratory for Immunological Research, Schering-Plough, Dardilly, France
* Corresponding author; email: francine.briere{at}spcorp.com.
Recent studies in human have highlighted the importance of a distinct cellular entity, the plasmacytoid dendritic cell (PDC). To identify genes, the expression of which is restricted to human PDC, a cDNA subtraction technique was applied using cDNA from activated monocyte-derived DC (MDDC) as competitor. In the 650 sequences analyzed, 25% were for B cell transcripts. We also found lymphoid-related genes; immunoglobulin-like transcript 7 (ILT7), granzyme B (GrB), Spi-B, and the receptor tyrosine kinase Eph-B1. Granzyme B was upregulated upon activation, and protein was detected only in PDC. Eph-B1 protein was expressed in the cytoplasm and the nucleus of PDC and MDDC respectively. Interestingly, several novel molecules have been identified that were predicted to encode for a type 2 transmembrane protein (BRI 3), a putative cytokine (C-15, a cysteine-rich secreted protein), and a type I leucine-rich repeat protein (MAPA). The identification of genes expressed in PDC provides new insights on their function and origin.

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