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© The Rockefeller University Press, 0022-1007/1999/11/1505/ $5.00
The Journal of Experimental Medicine, Volume 190, Number 10, November 15, 1999 1505-1516


Original Article

Identification and Molecular Characterization of NKp30, a Novel Triggering Receptor Involved in Natural Cytotoxicity Mediated by Human Natural Killer Cells

Daniela Pendea, Silvia Parolinib, Anna Pessinoc, Simona Sivoric, Raffaella Augugliaroc, Luigia Morellic, Emanuela Marcenaroc, Laura Accamea, Angela Malaspinaa, Roberto Biassonia, Cristina Bottinoa, Lorenzo Morettaa,c, and Alessandro Morettac
a Istituto Nazionale per la Ricerca sul Cancro, 16132 Genova, Italy
b Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, 25100 Brescia, Italy
c Dipartimento di Medicina Sperimentale, Università di Genova, 16132 Genova, Italy

Correspondence to: Lorenzo Moretta, Laboratorio di Immunopatologia, Centro Biotecnologie Avanzate, L.go R. Benzi, 10, 16132 Genova, Italy. Tel:39-10-5737217/9 Fax:39-10-354123 E-mail:moretta{at}ermes.cba.unige.it.

Two major receptors involved in human natural cytotoxicity, NKp46 and NKp44, have recently been identified. However, experimental evidence suggested the existence of additional such receptor(s). In this study, by the generation of monoclonal antibodies (mAbs), we identified NKp30, a novel 30-kD triggering receptor selectively expressed by all resting and activated human natural killer (NK) cells. Although mAb-mediated cross-linking of NKp30 induces strong NK cell activation, mAb-mediated masking inhibits the NK cytotoxicity against normal or tumor target cells. NKp30 cooperates with NKp46 and/or NKp44 in the induction of NK-mediated cytotoxicity against the majority of target cells, whereas it represents the major triggering receptor in the killing of certain tumors. This novel receptor is associated with CD3{zeta} chains that become tyrosine phosphorylated upon sodium pervanadate treatment of NK cells. Molecular cloning of NKp30 cDNA revealed a member of the immunoglobulin superfamily, characterized by a single V-type domain and a charged residue in the transmembrane portion. Moreover, we show that NKp30 is encoded by the previously identified 1C7 gene, for which the function and the cellular distribution of the putative product were not identified in previous studies.

Key Words: natural killer cells, triggering receptor, natural cytotoxicity


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