Rab11A regulates dense granule transport and secretion during Toxoplasma gondii invasion of host cells and parasite replication.

Abstract:

:Toxoplasma gondii possesses an armada of secreted virulent factors that enable parasite invasion and survival into host cells. These factors are contained in specific secretory organelles, the rhoptries, micronemes and dense granules that release their content upon host cell recognition. Dense granules are secreted in a constitutive manner during parasite replication and play a crucial role in modulating host metabolic and immune responses. While the molecular mechanisms triggering rhoptry and microneme release upon host cell adhesion have been well studied, constitutive secretion remains a poorly explored aspect of T. gondii vesicular trafficking. Here, we investigated the role of the small GTPase Rab11A, a known regulator of exocytosis in eukaryotic cells. Our data revealed an essential role of Rab11A in promoting the cytoskeleton driven transport of dense granules and the release of their content into the vacuolar space. Rab11A also regulates transmembrane protein trafficking and localization during parasite replication, indicating a broader role of Rab11A in cargo exocytosis at the plasma membrane. Moreover, we found that Rab11A also regulates extracellular parasite motility and adhesion to host cells. In line with these findings, MIC2 secretion was altered in Rab11A-defective parasites, which also exhibited severe morphological defects. Strikingly, by live imaging we observed a polarized accumulation of Rab11A-positive vesicles and dense granules at the apical pole of extracellular motile and invading parasites suggesting that apically polarized Rab11A-dependent delivery of cargo regulates early secretory events during parasite entry into host cells.

journal_name

PLoS Pathog

journal_title

PLoS pathogens

authors

Venugopal K,Chehade S,Werkmeister E,Barois N,Periz J,Lafont F,Tardieux I,Khalife J,Langsley G,Meissner M,Marion S

doi

10.1371/journal.ppat.1008106

subject

Has Abstract

pub_date

2020-05-28 00:00:00

pages

e1008106

issue

5

eissn

1553-7366

issn

1553-7374

pii

PPATHOGENS-D-19-01732

journal_volume

16

pub_type

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