Profoundly Reduced CD1c + Myeloid Dendritic Cell HLA-DR and CD86 Expression and Increased Tumor Necrosis Factor Production in Experimental Human Blood-Stage Malaria Infection

Author:

Loughland Jessica R.1,Minigo Gabriela1,Burel Julie2,Tipping Peta E.1,Piera Kim A.1,Amante Fiona H.2,Engwerda Christian R.2,Good Michael F.3,Doolan Denise L.2,Anstey Nicholas M.14,McCarthy James S.2,Woodberry Tonia1

Affiliation:

1. Menzies School of Health Research, Darwin, Australia, and Charles Darwin University, Darwin, Australia

2. QIMR Berghofer Medical Research Institute and University of Queensland, Brisbane, Australia

3. Griffith University, Gold Coast, Queensland, Australia

4. Royal Darwin Hospital, Darwin, Australia

Abstract

ABSTRACT Dendritic cells (DCs) are sentinels of the immune system that uniquely prime naive cells and initiate adaptive immune responses. CD1c (BDCA-1) myeloid DCs (CD1c + mDCs) highly express HLA-DR, have a broad Toll-like receptor (TLR) repertoire, and secrete immune modulatory cytokines. To better understand immune responses to malaria, CD1c + mDC maturation and cytokine production were examined in healthy volunteers before and after experimental intravenous Plasmodium falciparum infection with 150- or 1,800-parasite-infected red blood cells (pRBCs). After either dose, CD1c + mDCs significantly reduced HLA-DR expression in prepatent infections. Circulating CD1c + mDCs did not upregulate HLA-DR after pRBC or TLR ligand stimulation and exhibited reduced CD86 expression. At peak parasitemia, CD1c + mDCs produced significantly more tumor necrosis factor (TNF), whereas interleukin-12 (IL-12) production was unchanged. Interestingly, only the 1,800-pRBC dose caused a reduction in the circulating CD1c + mDC count with evidence of apoptosis. The 1,800-pRBC dose produced no change in T cell IFN-γ or IL-2 production at peak parasitemia or at 3 weeks posttreatment. Overall, CD1c + mDCs are compromised by P. falciparum exposure, with impaired HLA-DR and CD86 expression, and have an increased capacity for TNF but not IL-12 production. A first prepatent P. falciparum infection is sufficient to modulate CD1c + mDC responsiveness, likely contributing to hampered effector T cell cytokine responses and assisting parasite immune evasion.

Publisher

American Society for Microbiology

Subject

Infectious Diseases,Immunology,Microbiology,Parasitology

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