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Inducible mechanisms of disease tolerance provide an alternative strategy of acquired immunity to malaria.

Wiebke Nahrendorf | Alasdair Ivens | Philip J Spence
eLife | 2021

Immunity to malaria is often considered slow to develop but this only applies to defense mechanisms that function to eliminate parasites (resistance). In contrast, immunity to severe disease can be acquired quickly and without the need for improved pathogen control (tolerance). Using Plasmodium chabaudi, we show that a single malaria episode is sufficient to induce host adaptations that can minimise inflammation, prevent tissue damage and avert endothelium activation, a hallmark of severe disease. Importantly, monocytes are functionally reprogrammed to prevent their differentiation into inflammatory macrophages and instead promote mechanisms of stress tolerance to protect their niche. This alternative fate is not underpinned by epigenetic reprogramming of bone marrow progenitors but appears to be imprinted within the remodelled spleen. Crucially, all of these adaptations operate independently of pathogen load and limit the damage caused by malaria parasites in subsequent infections. Acquired immunity to malaria therefore prioritises host fitness over pathogen clearance.

Pubmed ID: 33752799

Antibodies used in this publication

Associated grants

  • Agency: Medical Research Council, United Kingdom
    Id: MR/K001744/1
  • Agency: Wellcome Trust, United Kingdom
    Id: 107668/Z/15/Z
  • Agency: Biotechnology and Biological Sciences Research Council, United Kingdom
    Id: BB/J004243/1
  • Agency: Wellcome Trust, United Kingdom

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