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Subset-dependent modulation of dendritic cell activity by circovirus type 2.
Isabelle E Vincent1, Carlos P Carrasco, Laurence Guzylack-Piriou
1Institute of Virology and Immunoprophylaxis, CH-3147 Mittelhäusern, Switzerland. isabelle.vincent@ivi.admin.ch
Immunology
|June 11, 2005
Summary
Porcine circovirus type 2 (PCV2) infects dendritic cells (DCs) without replication, impairing natural interferon-producing cell (NIPC) function. This PCV2 interaction disrupts immune responses, potentially favoring secondary infections.
Area of Science:
- Immunology
- Virology
- Cell Biology
Background:
- Dendritic cells (DCs) are crucial for immune defense against viral infections.
- Porcine circovirus type 2 (PCV2), a single-stranded DNA virus, interacts with DCs in pigs and humans.
- Understanding viral-DC interactions is key to immune defense strategies.
Purpose of the Study:
- To investigate the interaction between Porcine circovirus type 2 (PCV2) and dendritic cells (DCs).
- To elucidate the mechanism of PCV2 internalization by DCs.
- To determine the immunomodulatory effects of PCV2 on DC function, particularly NIPCs.
Main Methods:
- Observed PCV2 internalization in various DC subsets (myeloid, plasmacytoid/NIPCs, precursors).
- Assessed DC differentiation and maturation using specific cocktails (IFN-alpha/TNF-alpha).
- Investigated PCV2 uptake mechanisms (wortmannin, cytochalasin D, chlorpromazine, bafilomycin) and NIPC response to CpG-ODN.
Main Results:
- PCV2 was internalized by both mature and immature DCs via a non-macropinocytic pathway.
- PCV2 did not affect DC differentiation or maturation induced by IFN-alpha/TNF-alpha.
- PCV2 impaired NIPC costimulatory function by inhibiting IFN-alpha and TNF-alpha production in response to CpG-ODN.
Conclusions:
- PCV2's immunomodulatory activity stems from disrupting NIPC function.
- This disruption impairs myeloid DC maturation and the recognition of danger signals.
- PCV2's interaction with DCs may favor the establishment of secondary infections.