scholarly journals Cutting Edge: Pulmonary Legionella pneumophila Is Controlled by Plasmacytoid Dendritic Cells but Not Type I IFN

2010 ◽  
Vol 184 (10) ◽  
pp. 5429-5433 ◽  
Author(s):  
Desmond K. Y. Ang ◽  
Clare V. L. Oates ◽  
Ralf Schuelein ◽  
Michelle Kelly ◽  
Fiona M. Sansom ◽  
...  
Keyword(s):  
Dendritic Cells ◽  
Legionella Pneumophila ◽  
Plasmacytoid Dendritic Cells ◽  
Cutting Edge ◽  
Type I ◽  
Type I Ifn

scholarly journals Cutting Edge: BCAP Promotes Lupus-like Disease and TLR-Mediated Type I IFN Induction in Plasmacytoid Dendritic Cells

2019 ◽  
Vol 202 (9) ◽  
pp. 2529-2534 ◽  
Author(s):  
Talyn Chu ◽  
Minjian Ni ◽  
Chunmo Chen ◽  
Shreeram Akilesh ◽  
Jessica A. Hamerman
Keyword(s):  
Dendritic Cells ◽  
Plasmacytoid Dendritic Cells ◽  
Cutting Edge ◽  
Type I ◽  
Type I Ifn

PLASMACYTOID DENDRITIC CELLS FUNCTION IN HIV INFECTION

2008 ◽  
Vol 31 (4) ◽  
pp. 13
Author(s):  
Martin Hyrcza ◽  
Mario Ostrowski ◽  
Sandy Der
Keyword(s):  
Dendritic Cells ◽  
Influenza Virus ◽  
Hiv Infection ◽  
Gene Transcription ◽  
Sendai Virus ◽  
Plasmacytoid Dendritic Cells ◽  
Type I Interferons ◽  
Interferon Response ◽  
Type I ◽  
Type I Ifn

Plasmacytoid dendritic cells (pDCs) are innate immune cells able to produce large quantities of type I interferons (IFN) when activated. Human immunodeficiency virus (HIV)-infected patients show generalized immune dysfunction characterized in part by chronic interferon response. In this study we investigated the role of dendritic cells inactivating and maintaining this response. Specifically we compared the IFN geneactivity in pDCs in response to several viruses and TLR agonists. We hypothesized that 1) the pattern of IFN gene transcription would differ in pDCs treated with HIV than with other agents, and 2) that pDCs from patients from different stages of disease would respond differently to the stimulations. To test these hypotheses, we obtained pDCs from 15 HIV-infected and uninfected individuals and treated freshly isolated pDCs with either HIV (BAL strain), influenza virus (A/PR/8/34), Sendai virus (Cantell strain), TLR7 agonist(imiquimod), or TLR9 agonist (CpG-ODN) for 6h. Type I IFN gene transcription was monitored by real time qPCRfor IFNA1, A2, A5, A6, A8,A17, B1, and E1, and cytokine levels were assayed by Cytometric Bead Arrays forTNF?, IL6, IL8, IL10, IL1?, and IL12p70. pDC function as determined by these two assays showed no difference between HIV-infected and uninfected patients or between patients with early or chronic infection. Specifically, HIV did notinduce type I IFN gene expression, whereas influenza virus, Sendai virus and imiquimod did. Similarly, HIV failed to induce any cytokine release from pDCs in contrast to influenza virus, Sendai virus and imiquimod, which stimulatedrelease of TNF?, IL6, or IL8. Together these results suggest that the reaction of pDCs to HIV virus is quantitatively different from the response to agents such as virus, Sendai virus, and imiquimod. In addition, pDCs from HIV-infected persons have responses similar to pDCs from uninfected donors, suggesting, that the DC function may not be affected by HIV infection.

scholarly journals STING-Licensed Macrophages Prime Type I IFN Production by Plasmacytoid Dendritic Cells in the Bone Marrow during Severe Plasmodium yoelii Malaria

2016 ◽  
Vol 12 (10) ◽  
pp. e1005975 ◽  
Author(s):  
Emily Spaulding ◽  
David Fooksman ◽  
Jamie M. Moore ◽  
Alex Saidi ◽  
Catherine M. Feintuch ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Dendritic Cells ◽  
Plasmodium Yoelii ◽  
Plasmacytoid Dendritic Cells ◽  
Type I ◽  
Type I Ifn ◽  
Prime Type

scholarly journals Type I Interferon Inhibition and Dendritic Cell Activation during Gammaherpesvirus Respiratory Infection

2007 ◽  
Vol 81 (18) ◽  
pp. 9778-9789 ◽  
Author(s):  
Janet L. Weslow-Schmidt ◽  
Nancy A. Jewell ◽  
Sara E. Mertz ◽  
J. Pedro Simas ◽  
Joan E. Durbin ◽  
...  
Keyword(s):  
Dendritic Cells ◽  
Dendritic Cell ◽  
Cell Activation ◽  
Type I Interferon ◽  
Plasmacytoid Dendritic Cells ◽  
The Body ◽  
Type I ◽  
Type I Ifn ◽  
Dendritic Cell Activation ◽  
Murine Gammaherpesvirus

ABSTRACT The respiratory tract is a major mucosal site for microorganism entry into the body, and type I interferon (IFN) and dendritic cells constitute a first line of defense against viral infections. We have analyzed the interaction between a model DNA virus, plasmacytoid dendritic cells, and type I IFN during lung infection of mice. Our data show that murine gammaherpesvirus 68 (γHV68) inhibits type I IFN secretion by dendritic cells and that plasmacytoid dendritic cells are necessary for conventional dendritic cell maturation in response to γHV68. Following γHV68 intranasal inoculation, the local and systemic IFN-α/β response is below detectable levels, and plasmacytoid dendritic cells are activated and recruited into the lung with a tissue distribution that differs from that of conventional dendritic cells. Our results suggest that plasmacytoid dendritic cells and type I IFN have important but independent roles during the early response to a respiratory γHV68 infection. γHV68 infection inhibits type I IFN production by dendritic cells and is a poor inducer of IFN-α/β in vivo, which may serve as an immune evasion strategy.

scholarly journals Dysregulated miRNome of plasmacytoid dendritic cells from patients with Sjögren’s syndrome is associated with processes at the centre of their function

Rheumatology ◽  
2019 ◽  
Vol 58 (12) ◽  
pp. 2305-2314 ◽  
Author(s):  
Maarten R Hillen ◽  
Eleni Chouri ◽  
Maojie Wang ◽  
Sofie L M Blokland ◽  
Sarita A Y Hartgring ◽  
...  
Keyword(s):  
Cell Death ◽  
Dendritic Cells ◽  
Mammalian Target Of Rapamycin ◽  
Plasmacytoid Dendritic Cells ◽  
Type I ◽  
Large Set ◽  
Type I Ifn ◽  
Stable Isotope Labelling ◽  
Proteomic Approach ◽  
Novel Targets

Abstract Objective A considerable body of evidence supports a role for type-I IFN in the pathogenesis of primary SS (pSS). As plasmacytoid dendritic cells (pDCs) are a major source of type-I IFN, we investigated their molecular regulation by measuring expression of a large set of miRNAs. Methods pDCs were isolated from peripheral blood of pSS patients (n = 30) and healthy controls (n = 16) divided into two independent cohorts (discovery and replication). Screening of 758 miRNAs was assessed by an OpenArray quantitative PCR-based technique; replication of a set of identified miRNAs was performed by custom array. Functional annotation of miRNA targets was performed using pathway enrichment. Novel targets of miR-29a and miR-29c were identified using a proteomic approach (stable isotope labelling with amino acids in cell culture). Results In the discovery cohort, 20 miRNAs were differentially expressed in pSS pDCs compared with healthy control pDCs. Of these, differential expression of 10 miRNAs was confirmed in the replication cohort. The dysregulated miRNAs were involved in phosphoinositide 3-kinase-Ak strain transforming and mammalian target of rapamycin signalling, as well as regulation of cell death. In addition, a set of novel protein targets of miR-29a and miR-29c were identified, including five targets that were regulated by both miRs. Conclusion The dysregulated miRNome in pDCs of patients with pSS is associated with aberrant regulation of processes at the centre of pDC function, including type-I IFN production and cell death. As miR-29a and miR-29c are pro-apoptotic factors and several of the novel targets identified here are regulators of apoptosis, their downregulation in patients with pSS is associated with enhanced pDC survival.

CS16-6. Plasmacytoid Dendritic Cells are infected by Epstein Barr virus and induces TLR- dependent type I IFN production

Cytokine ◽  
2011 ◽  
Vol 56 (1) ◽  
pp. 106
Author(s):  
Martina Severa ◽  
Elena Giacomini ◽  
Eleni Anastasiadou ◽  
Valerie Gafa ◽  
Fabiana Rizzo ◽  
...  
Keyword(s):  
Dendritic Cells ◽  
Epstein Barr Virus ◽  
Plasmacytoid Dendritic Cells ◽  
Type I ◽  
Type I Ifn ◽  
Barr Virus ◽  
Epstein Barr ◽  
Dependent Type

scholarly journals Cutting Edge: Critical Role of IκB Kinase α in TLR7/9-Induced Type I IFN Production by Conventional Dendritic Cells

2010 ◽  
Vol 184 (7) ◽  
pp. 3341-3345 ◽  
Author(s):  
Katsuaki Hoshino ◽  
Izumi Sasaki ◽  
Takahiro Sugiyama ◽  
Takahiro Yano ◽  
Chihiro Yamazaki ◽  
...  
Keyword(s):  
Dendritic Cells ◽  
Critical Role ◽  
Cutting Edge ◽  
Type I ◽  
Type I Ifn ◽  
Iκb Kinase

scholarly journals Plasmacytoid dendritic cells control TLR7 sensitivity of naive B cells via type I IFN

2005 ◽  
Vol 174 (9) ◽  
pp. 5884b-5884
Author(s):  
Isabelle Béatrice Berkeredjian-Ding ◽  
Moritz Wagner ◽  
Veit Hornung ◽  
Thomas Giese ◽  
Max Schnurr ◽  
...  
Keyword(s):  
Dendritic Cells ◽  
B Cells ◽  
Plasmacytoid Dendritic Cells ◽  
Type I ◽  
Type I Ifn
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