Abstract:
:Autophagy has recently been implicated in the host defense against the intracellular protozoan pathogen, Toxoplasma gondii, a major opportunistic pathogen of the central nervous system in immunosuppressed individuals. In both IFN gamma-activated macrophages and astrocytes, the p47 GTPases traffic to the T. gondii parasitophorous vacuole, followed by vacuolar disruption, parasite killing and clearance of the dead parasites. In macrophages, it is relatively well established that autophagy is involved in parasite elimination and killing. The role of autophagy in parasite elimination in astrocytes, a dominant host cell in the central nervous system, is much less clear. Our studies indicate that in IFN gamma-stimulated astrocytes, autophagy of disrupted vacuoles and/or dead parasites does not occur but rather that degradation of the parasite occurs in the host cytoplasm. However, recent studies indicate autophagy may be involved in the elimination of the degraded parasite material from the astrocyte host cell cytoplasm and suggest that autophagous removal of degraded parasite material may be necessary for survival of the host cell. Delivery of parasite antigen from the cytosol to the endolysosomal compartments in astrocytes is of importance as it suggests a pathway by which astrocytes could present Toxoplasma antigens via the MHC Class II pathway and function as an antigen-presenting cell for the parasite in the brain.
journal_name
Autophagyjournal_title
Autophagyauthors
Halonen SKdoi
10.4161/auto.5.2.7637subject
Has Abstractpub_date
2009-02-01 00:00:00pages
268-9issue
2eissn
1554-8627issn
1554-8635pii
7637journal_volume
5pub_type
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