Plasmodium-infected erythrocytes induce secretion of IGFBP7 to form type II rosettes and escape phagocytosis

WC Lee, B Russell, RM Sobota, K Ghaffar… - Elife, 2020 - elifesciences.org
WC Lee, B Russell, RM Sobota, K Ghaffar, SW Howland, ZX Wong, AG Maier
Elife, 2020elifesciences.org
In malaria, rosetting is described as a phenomenon where an infected erythrocyte (IRBC) is
attached to uninfected erythrocytes (URBC). In some studies, rosetting has been associated
with malaria pathogenesis. Here, we have identified a new type of rosetting. Using a step-by-
step approach, we identified IGFBP7, a protein secreted by monocytes in response to
parasite stimulation, as a rosette-stimulator for Plasmodium falciparum-and P. vivax-IRBC.
IGFBP7-mediated rosette-stimulation was rapid yet reversible. Unlike type I rosetting that …
In malaria, rosetting is described as a phenomenon where an infected erythrocyte (IRBC) is attached to uninfected erythrocytes (URBC). In some studies, rosetting has been associated with malaria pathogenesis. Here, we have identified a new type of rosetting. Using a step-by-step approach, we identified IGFBP7, a protein secreted by monocytes in response to parasite stimulation, as a rosette-stimulator for Plasmodium falciparum- and P. vivax-IRBC. IGFBP7-mediated rosette-stimulation was rapid yet reversible. Unlike type I rosetting that involves direct interaction of rosetting ligands on IRBC and receptors on URBC, the IGFBP7-mediated, type II rosetting requires two additional serum factors, namely von Willebrand factor and thrombospondin-1. These two factors interact with IGFBP7 to mediate rosette formation by the IRBC. Importantly, the IGFBP7-induced type II rosetting hampers phagocytosis of IRBC by host phagocytes.
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