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Published online before print September 2, 2003
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* UMDNJ-New Jersey Medical School,
UMDNJGraduate School for Biomedical Sciences, Newark, NJ 07103;
The Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins School of Medicine, Baltimore, MD 21231; and the
Cancer Institute of New Jersey
3Correspondence: UMDNJ-New Jersey Medical School, Dept. Pathology and Lab. Medicine, 185 So. Orange Ave., Newark, NJ 07103. E-mail: bocarsly{at}umdnj.edu; also, Dr. Paula Pitha, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins and The Cancer Research Building, Baltimore, MD 21231. E-mail: parowe{at}jhmi.edu;
Plasmacytoid dendritic cells (PDC) produce high levels of type I IFN upon stimulation with viruses, while monocytes and monocyte-derived dendritic cells (MDDC) produce significantly lower levels. To find what determines the high production of type I IFN in PDC, we examined the relative levels of IRF transcription factors, some of which play critical roles in the induction of IFN. Furthermore, to determine whether the differences could result from expression of distinct IFNA subtypes, the profile of IFNA genes expressed was examined. PDC responded equally well to stimulation with HSV-1 and Sendai virus (SV) by producing high levels of type I IFN, whereas the MDDC and monocyte response to SV were lower, and neither responded well to HSV-1. All three populations constitutively expressed most of the IRF genes. However, real-time RT-PCR demonstrated increased levels of IRF-7 transcripts in PDC compared with monocytes. As determined by intracellular flow cytometry, the PDC constitutively expressed significantly higher levels of IRF-7 protein than the other populations while IRF-3 levels were similar among populations. Analysis of the profile of IFNA genes expressed in virus-stimulated PDC, monocytes and MDDC demonstrated that each population expressed IFNA1 as the major subtype but that the range of the subtypes expressed in PDC was broader, with some donor and stimulus-dependent variability. We conclude that PDC but not MDDC are uniquely preprogrammed to respond rapidly and effectively to a range of viral pathogens with high levels of IFN-
production due to the high levels of constitutively expressed IRF-7.
Key Words: IRF-7 interferon producing cells PDC
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