1. Features of autophagic cell death in Plasmodium liver-stage parasites.
- Author
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Eickel N, Kaiser G, Prado M, Burda PC, Roelli M, Stanway RR, and Heussler VT
- Subjects
- Amino Acid Sequence, Animals, Conserved Sequence, Databases, Protein, Evolution, Molecular, Gene Knockout Techniques, Genetic Complementation Test, Green Fluorescent Proteins metabolism, Hep G2 Cells, Humans, Lipid Metabolism, Mice, Molecular Sequence Data, Parasites ultrastructure, Phagosomes metabolism, Phagosomes ultrastructure, Plasmodium berghei ultrastructure, Protein Transport, Protozoan Proteins metabolism, Saccharomyces cerevisiae metabolism, Schizonts cytology, Schizonts metabolism, Schizonts ultrastructure, Sequence Homology, Amino Acid, Vacuoles metabolism, Autophagy, Life Cycle Stages, Liver parasitology, Parasites cytology, Parasites growth & development, Plasmodium berghei cytology, Plasmodium berghei growth & development
- Abstract
Analyzing molecular determinants of Plasmodium parasite cell death is a promising approach for exploring new avenues in the fight against malaria. Three major forms of cell death (apoptosis, necrosis and autophagic cell death) have been described in multicellular organisms but which cell death processes exist in protozoa is still a matter of debate. Here we suggest that all three types of cell death occur in Plasmodium liver-stage parasites. Whereas typical molecular markers for apoptosis and necrosis have not been found in the genome of Plasmodium parasites, we identified genes coding for putative autophagy-marker proteins and thus concentrated on autophagic cell death. We characterized the Plasmodium berghei homolog of the prominent autophagy marker protein Atg8/LC3 and found that it localized to the apicoplast. A relocalization of PbAtg8 to autophagosome-like vesicles or vacuoles that appear in dying parasites was not, however, observed. This strongly suggests that the function of this protein in liver-stage parasites is restricted to apicoplast biology.
- Published
- 2013
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