Recent evidence indicates that integrin engagement results in the activation of biochemical signaling events important for regulating different cell functions, such as migration, adhesion, proliferation, differentiation, apoptosis, and specific gene expression. Here, we report that β1 integrin ligation on human natural killer (NK) cells results in the activation of Ras/mitogen-activated protein kinase pathways. Formation of Shc–growth factor receptor–bound protein 2 (Grb2) and Shc–proline-rich tyrosine kinase 2–Grb2 complexes are the receptor-proximal events accompanying the β1 integrin–mediated Ras activation. In addition, we demonstrate that ligation of β1 integrins results in the stimulation of interferon γ (IFN-γ) production, which is under the control of extracellular signal–regulated kinase 2 activation. Overall, our data indicate that β1 integrins, by delivering signals capable of triggering IFN-γ production, may function as NK-activating receptors.
Integrin-mediated Ras–Extracellular Regulated Kinase (ERK) Signaling Regulates Interferon γ Production in Human Natural Killer Cells
Address correspondence to Fabrizio Mainiero, Department of Experimental Medicine and Pathology, University of Rome “La Sapienza,” viale Regina Elena, 324, 00161 Rome, Italy. Phone: 39-6-4468448; Fax: 39-6-4468448; E-mail: [email protected]
This work was partially supported by grants from the Italian Association for Cancer Research (AIRC), Istituto Superiore di Sanità Italy-USA “Therapy of Tumors” Program, Ministero dell'Università e della Ricerca Scientifica e Tecnologica (MURST) 40% and 60%, Ministero della Sanità, and by a Consiglio Nazionale delle Ricerche special project on Biotechnologies.
Fabrizio Mainiero, Angela Gismondi, Alessandra Soriani, Marco Cippitelli, Gabriella Palmieri, Jordan Jacobelli, Mario Piccoli, Luigi Frati, Angela Santoni; Integrin-mediated Ras–Extracellular Regulated Kinase (ERK) Signaling Regulates Interferon γ Production in Human Natural Killer Cells . J Exp Med 5 October 1998; 188 (7): 1267–1275. doi: https://doi.org/10.1084/jem.188.7.1267
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