Transient decrease in human peripheral blood myeloid dendritic cells following influenza vaccination correlates with...

Area of Science:

• Immunology
• Vaccinology

Background:

• Dendritic cells (DCs) are key initiators of adaptive immunity.
• While tissue-resident and monocyte-derived DCs are well-studied, the role of peripheral blood dendritic cells (PBDCs) in homeostasis is less understood.

Purpose of the Study:

• To investigate the behavior of PBDC populations following influenza vaccination.
• To determine if PBDC dynamics correlate with immune response markers.

Main Methods:

• Flow cytometry was used to analyze myeloid (CD11c+CD303-) and plasmacytoid (CD11c-CD303+) DC subsets in peripheral blood.
• Samples were collected from individuals receiving a seasonal trivalent inactivated influenza vaccine.

Main Results:

• A transient decrease in CD11c+CD1c- myeloid DC subsets (including CD141+ and CD141-) was observed 5-10 days post-vaccination.
• Plasmacytoid DCs remained stable, while myeloid subsets rebounded by 1 month.
• The magnitude of CD141+ myeloid DC reduction correlated significantly with influenza-specific antibody induction at 1 month.

Conclusions:

• Influenza vaccination induces mobilization of peripheral blood myeloid DCs.
• Specific PBDC subsets may serve as potential biomarkers for assessing vaccine-induced immune responses.