Details

Autor(en) / Beteiligte

• Murphy, Melissa
• Suliman, Sara
• Briel, Libby
• Veldtsman, Helen
• Khomba, Nondumiso
• Africa, Hadn
• Steyn, Marcia
• Snyders, Candice I.
• van Rensburg, Ilana C.
• Walzl, Gerhard
• Chegou, Novel N.
• Hatherill, Mark
• Hanekom, Willem A.
• Scriba, Thomas J.
• Nemes, Elisa

Titel

Newborn bacille Calmette-Guérin vaccination induces robust infant interferon-γ-expressing natural killer cell responses to mycobacteria

Ist Teil von

• International journal of infectious diseases, 2023-05, Vol.130, p.S52-S62

Ort / Verlag

Canada: Elsevier Ltd

Erscheinungsjahr

2023

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• •Bacille Calmette-Guérin (BCG) vaccination did not modulate myeloid functional responses to BCG.•BCG vaccination induced natural killer (NK) cell functional responses to BCG.•NK responses correlate with pro-inflammatory mediators only in vaccinated infants.•BCG-induced NK cell responses may contribute to immunity against mycobacteria. The bacille Calmette-Guérin (BCG) vaccine is usually administered at birth to protect against severe forms of tuberculosis in children. BCG also confers some protection against other infections, possibly mediated by innate immune training. We investigated whether newborn BCG vaccination modulates myeloid and natural killer (NK) cell responses to mycobacteria. BCG vaccination was either administered at birth or delayed to 6 or 10 weeks of age in 130 South African infants. Whole blood was stimulated with BCG and clusters of differentiation (CD)4+ T, myeloid, and NK cell responses were measured by flow cytometry; the levels of secreted cytokines were measured by a multiplex bead array. Newborn BCG vaccination was associated with significantly higher frequencies of BCG-reactive, cytokine-expressing CD4+ T cells, and interferon (IFN)-γ-expressing NK cells than in unvaccinated infants but no differences in cytokine-expressing CD33+ myeloid cells were observed. The induction of BCG-reactive IFN-γ-expressing NK cells was not associated with the markers of NK cell maturation, differentiation, or cytokine receptor expression. BCG-reactive NK cell responses correlated directly with the levels of secreted interleukin (IL)-2 and IFN-γ and the innate pro-inflammatory cytokines IL-6, IL-1β, and tumor necrosis factor (TNF) in BCG-vaccinated infants only. We showed that BCG-reactive IFN-γ-expressing NK cells are strongly induced by BCG vaccination in infants and are likely amplified through bystander cytokines.