The proneurotrophin receptor sortilin is required for Mycobacterium tuberculosis control by macrophages
journal contributionposted on 02.10.2020, 15:26 by Cristina L Vázquez, Angela Rodgers, Susanne Herbst, Stephen Coade, Achim Gronow, Carlos A Guzman, Mark S Wilson, Makoto Kanzaki, Anders Nykjaer, Maximiliano G Gutierrez
Sorting of luminal and membrane proteins into phagosomes is critical for the immune function of this organelle. However, little is known about the mechanisms that contribute to the spatiotemporal regulation of this process. Here, we investigated the role of the proneurotrophin receptor sortilin during phagosome maturation and mycobacterial killing. We show that this receptor is acquired by mycobacteria-containing phagosomes via interactions with the adaptor proteins AP-1 and GGAs. Interestingly, the phagosomal association of sortilin is critical for the delivery of acid sphingomyelinase (ASMase) and required for efficient phagosome maturation. Macrophages from Sort1(-/-) mice are less efficient in restricting the growth of Mycobacterium bovis BCG and M. tuberculosis. In vivo, Sort1(-/-) mice showed a substantial increase in cellular infiltration of neutrophils in their lungs and higher bacterial burden after infection with M. tuberculosis. Altogether, sortilin defines a pathway required for optimal intracellular mycobacteria control and lung inflammation in vivo.
Adaptor Proteins, Vesicular TransportAnimalsBacterial LoadDisease Models, AnimalLungMacrophagesMiceMice, KnockoutMicrobial ViabilityMycobacterium bovisMycobacterium tuberculosisPhagosomesTuberculosis, PulmonaryGutierrez FC001092Wilson FC001220GSKHP-ackBRF-ack0601 Biochemistry and Cell Biology0299 Other Physical Sciences