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Genomic DNA released by dying cells induces the maturation of APCs
1Section of Retroviral Immunology, Center for Biologics and Evaluation Research, Food and Drug Administration, Bethesda, MD 20892, USA.
Abstract:
Mature APCs play a key role in the induction of Ag-specific immunity. This work examines whether genomic DNA released by dying cells provides a stimulus for APC maturation. Double-stranded but not single-stranded genomic DNA triggered APC to up-regulate expression of MHC class I/II and various costimulatory molecules. Functionally, dsDNA enhanced APC function in vitro and improved primary cellular and humoral immune responses in vivo. These effects were dependent on the length and concentration of the dsDNA but were independent of nucleotide sequence. The maturation of APC induced by dsDNA may promote host survival by improving immune surveillance at sites of tissue injury/infection.
Insights
Genomic DNA from dying cells, specifically double-stranded DNA (dsDNA), stimulates antigen-presenting cells (APCs) to mature. This maturation enhances immune responses, potentially improving host survival during infection or injury.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Mature antigen-presenting cells (APCs) are crucial for initiating antigen-specific immune responses.
- The role of genomic DNA released from dying cells as a potential immune stimulus for APCs remains to be fully elucidated.
Purpose of the Study:
- To investigate whether genomic DNA released by dying cells acts as a stimulus for APC maturation.
- To determine the characteristics of genomic DNA that trigger APC maturation and subsequent immune enhancement.
Main Methods:
- Treatment of APCs with varying forms (single-stranded vs. double-stranded) and concentrations of genomic DNA.
- Analysis of APC surface marker expression (MHC class I/II, costimulatory molecules) via flow cytometry.
- Assessment of APC function in vitro and evaluation of primary cellular and humoral immune responses in vivo.
Main Results:
- Double-stranded DNA (dsDNA), but not single-stranded DNA, significantly upregulated MHC class I/II and costimulatory molecule expression on APCs.
- dsDNA exposure enhanced APC function in vitro and improved cellular and humoral immunity in vivo.
- The observed effects were dependent on dsDNA length and concentration, but not nucleotide sequence.
Conclusions:
- Genomic dsDNA released by dying cells serves as a potent endogenous stimulus for APC maturation.
- dsDNA-induced APC maturation enhances immune surveillance, potentially contributing to host survival at sites of tissue damage or infection.