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Activation-induced colocalisation of SCAMP5 with IFNα in human plasmacytoid dendritic cells
Juliëtte N Pouw1,2, Michel A M Olde Nordkamp3,2, Tom G O'Toole2
1Rheumatology and Clinical Immunology, University Medical Centre Utrecht, Utrecht University, Utrecht, The Netherlands j.n.pouw-3@umcutrecht.nl.
Insights
Secretory carrier membrane protein 5 (SCAMP5) colocalizes with Interferon-alpha (IFNα) in activated plasmacytoid dendritic cells (pDCs). This supports SCAMP5
Area of Science:
- Immunology
- Cell Biology
Background:
- Plasmacytoid dendritic cells (pDCs) are key producers of type I Interferon (IFN) in Systemic Lupus Erythematosus (SLE).
- Secretory carrier membrane protein 5 (SCAMP5) is implicated in the type I IFN secretory pathway.
- The role of SCAMP5 in IFNα secretion by pDCs requires further investigation.
Discussion:
- This study investigated the subcellular distribution of SCAMP5 in human pDCs.
- SCAMP5 expression was measured in peripheral blood mononuclear cells and colocalization with IFNα was assessed in pDCs using ImageStream technology.
Key Insights:
- SCAMP5 is highly expressed by pDCs from peripheral blood.
- SCAMP5 colocalizes with IFNα in activated pDCs, with a mean Bright Detail Similarity (BDS) score of 2.0±0.1.
- 44% of activated pDCs showed a BDS score greater than 2.0 for SCAMP5 and IFNα.
Outlook:
- The findings support a role for SCAMP5 in the secretion of type I IFN by pDCs.
- Further research could explore the precise mechanisms by which SCAMP5 facilitates IFNα secretion.
- Understanding SCAMP5's function may offer new therapeutic targets for SLE and other IFN-mediated diseases.
Introduction:
Plasmacytoid dendritic cells (pDCs) are the main producers of type I interferon (IFN) in SLE. pDCs express high secretory carrier membrane protein 5 (SCAMP5). Recent work in transfected HEK cells connects SCAMP5 to the type I IFN secretory pathway. To further study the role of SCAMP5 in IFNα secretion by pDCs, we focused on the subcellular distribution of SCAMP5 in human pDCs freshly isolated from peripheral blood.
Methods:
We measured SCAMP5 expression by flow cytometry in peripheral blood mononuclear cells of healthy subjects (n=8). Next, we assessed the colocalisation of SCAMP5 with IFNα in pDCs of healthy subjects (n=4) by evaluating bright detail similarity (BDS) scores using ImageStream technology.
Results:
We confirm that SCAMP5 is highly expressed by pDCs derived from peripheral blood. In activated pDCs, we show that SCAMP5 colocalises with IFNα (mean BDS 2.0±0.1; BDS >2.0 in 44% of pDCs).
Conclusion:
SCAMP5 colocalises with IFNα in activated human pDCs, in support of a role of this trafficking protein in the secretion of type I IFN by pDCs.
