KIR3DL2/CpG ODN interaction mediates Sézary syndrome malignant T cell apoptosis.

Fiche publication


Date publication

janvier 2015

Journal

The Journal of investigative dermatology

Auteurs

Membres identifiés du Cancéropôle Est :
Pr BENSUSSAN Armand


Tous les auteurs :
Ghazi B, Thonnart N, Bagot M, Bensussan A, Marie-Cardine A

Résumé

We previously identified the NK cell receptor KIR3DL2 as a valuable diagnostic and prognostic marker for the detection of the tumoral T cell burden of Sézary syndrome (SS) patients. However, the function of this receptor on the malignant T lymphocyte population remained unexplored. We here demonstrate that engagement of KIR3DL2 by its recently identified ligand CpG oligodeoxynucleotide (ODN) induces the internalization of the receptor and leads to a caspase-dependent apoptosis of malignant T cells. This process of cellular death is correlated to a dephosphorylation of the transcription factor STAT3 (signal transducer and activator of transcription 3), which is found constitutively phosphorylated and activated in Sézary cells. Our results indicate that KIR3DL2 can directly promote SS malignant cell death through the use of CpG ODN.

Mots clés

Apoptosis, drug effects, CD4-Positive T-Lymphocytes, drug effects, Cells, Cultured, Humans, Ligands, Mycosis Fungoides, immunology, Oligodeoxyribonucleotides, immunology, Phosphorylation, drug effects, Receptors, KIR3DL2, immunology, STAT3 Transcription Factor, immunology, Sezary Syndrome, immunology, Signal Transduction, drug effects, Skin Neoplasms, immunology

Référence

J Invest Dermatol. 2015 01;135(1):229-237