Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 108, Issue 2, Pages 728-732Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1012356108
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Funding
- Istituto Superiore di Sanita
- Programma nazionale di ricerca sull'AIDS, Accordi di collaborazione scientifica [40G.41, 45G.11]
- Italian Concerted Action for AIDS vaccine
- Accordo di collaborazione scientifica [40D61]
- Associazione Italiana per la Ricerca sul Cancro
- Ministero dell'Istruzione, dell'Universita e della Ricerca MIUR-FIRB [RBLA039LSF-001]
- Ministero della Salute [RO strategici 3/07]
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The two major functions of human natural killer (NK) cells are conventionally associated with distinct cell subsets. Thus, cytolytic activity is mostly confined to the CD56(dim)CD16(+) subset, whereas cytokine production is generally assigned to CD56(bright)CD16(+/-) cells. In this study, we reevaluated the functional capabilities of these NK subsets with regard to the production of IFN-gamma at different time points after cell triggering via NKp46 and NKp30 activating receptors. Different from previous studies, cytokine production was also assessed at early intervals. We show that CD56(dim) NK cells produce IFN-gamma already at 2 to 4 h, whereas no cytokine production is detected beyond 16 h. In contrast, CD56(bright) cells release IFN-gamma only at late time intervals (> 16 h after stimulation). The rapid IFN-gamma production by CD56(dim) NK cells is in line with the presence of IFN-gamma mRNA in freshly isolated cells. Rapid IFN-gamma production was also induced by combinations of IL-2, IL-12, and IL-15. Our data indicate that not only cytolytic activity but also early IFN-gamma production is a functional property of CD56(dim) NK cells. Thus, this subset can assure a rapid and comprehensive NK cell intervention during the early phases of innate responses.
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