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CD163+ red pulp macrophages interact with marginal metallophilic macrophages during blood-stage malaria to maintain splenic architecture

Immunity·August 4Open Access
ImmunologyPractice changingBlood-Stage MalariaMalariaAnimal Study (Mouse Model)Macrophage BiologyAdultCD163

Summary

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What was studied

This study examined the ontogeny, self-renewal dynamics, and infection-induced fate of splenic CD163-expressing red pulp macrophage (CD163high RPM) subsets in mice, including their role in maintaining marginal zone architecture during and after blood-stage malaria.

Key findings

CD163high RPMs — derived from yolk sac progenitors and largely self-maintaining — were rapidly depleted during blood-stage malaria and failed to recover post-parasite clearance, being replaced by monocyte-derived CD163− RPMs; CD163 deficiency worsened marginal zone disintegration and impaired marginal metallophilic macrophage (MMM) recovery, revealing a CD163-dependent RPM-MMM crosstalk.

Study limitations

Findings are based on mouse models (fate-mapping and genetic knockouts), limiting direct translation to human malaria; long-term post-infection dynamics were assessed in mice, and it is unclear whether similar subset depletion and non-recovery occur in humans; the study does not address functional immune consequences (e.g., susceptibility to re-infection) of the rewired splenic architecture.

Clinical implications

Malaria causes lasting depletion of a specialized yolk sac-derived splenic macrophage subset that does not recover even after parasite clearance, with downstream disruption of marginal zone architecture — clinicians should consider that repeated or severe malaria episodes may cause durable impairment of splenic immune architecture beyond the acute episode.

Related Questions

Explore related topics

How does malaria affect splenic macrophage populations and long-term immune function?What is the role of yolk sac-derived macrophages versus monocyte-derived macrophages in splenic immunity?Can splenic marginal zone architecture recover after malaria, and does this affect susceptibility to reinfection?

Publication Details

Year
2026
Journal
Immunity
Source
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