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Michael K. Connolly, Andrea S. Bedrosian, Jon Mallen-St. Clair, Aaron P. Mitchell, Junaid Ibrahim, Andrea Stroud, H. Leon Pachter, Dafna Bar-Sagi, Alan B. Frey, George Miller
Published in Volume 119, Issue 11
J Clin Invest. 2009; 119(11):3213–3225 doi:10.1172/JCI37581
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Figure 3
Liver DCs from fibrotic mice induce elevated NK cell–mediated cytotoxicity in vitro via production of TNF-α.

(A) NLDCs or FLDCs were cocultured with splenic NK cells for 24 hours in a 2:1 DC/NK ratio. NK cells were then repurified and plated against 51Cr-labeled Yac-1 lymphoma targets. NK cells cocultured with DCs from fibrotic livers produced markedly high Yac-1 lysis, which was TNF-α dependent, whereas NK cells cultured alone or cocultured with NLDCs induced virtually no target lysis (P < 0.05). (BE) Analysis of cytokine production from DC-NK coculture revealed that FLDCs induced elevated production of (B) TNF-α, (C) IFN-γ, (D) MCP-1, and (E) IL-6 and IL-10 (P < 0.05). However, in each case, TNF-α blockade partially abrogated the elevated cytokine production (P < 0.05). Addition of 5 μM CpG to FLDC-NK coculture wells further markedly enhanced production of (F) IFN-γ and (G) IL-6 (P < 0.05). DC-NK coculture assays were repeated 4 times with similar results.