Regulation of Dendritic Cell Function by NK Cells: Mechanisms Underlying the Synergism in the Combination Therapy of IL-12 and 4-1BB Activation

Ping Ying Pan, Peidi Gu, Qingsheng Li, Dongping Xu, Kaare Weber, Shu Hsia Chen

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

The interactions between NK cells and dendritic cells (DCs) have been previously demonstrated in vitro. In this report, the in vivo cross-regulation between NK cells and DCs was studied in tumor-bearing mice treated with adenoviral vector expressing IL-12 and agonistic anti-4-1BB Abs. NK cells are essential for both tumor rejection and CTL development in the combination therapy (IL-12 plus anti-4-1BB). The numbers and functional activities of both NK cells and DCs in tumor-infiltrating leukocytes were synergistically increased in the IL-12 plus anti-4-1BB-treated mice compared with treatment with either reagent alone. NK depletion in vivo resulted in a significant decrease in the number of DCs in tumor-infiltrating leukocytes, strongly suggesting that NK cells are involved in the activation and expansion of DCs. The mechanism by which IL-12-activated NK cells regulate DC functions is, in part, mediated through the secretion of IFN-γ that leads to the up-regulation of 4-1BB by DCs. Furthermore, 4-1BB activation in conjunction with IL-12 gene delivery increased tumor infiltration of green fluorescence protein-labeled DCs and enhanced their MHC class II expression. The activation of DCs by NK cells and the subsequent development of antitumoral CTL responses facilitated by 4-1BB-activated DCs may account for the synergistic effects observed in the combination therapy in comparison to adenoviral vector expressing IL-12 or anti-4-1BB treatment alone.

Original languageEnglish (US)
Pages (from-to)4779-4789
Number of pages11
JournalJournal of Immunology
Volume172
Issue number8
DOIs
StatePublished - Apr 15 2004

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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