Abstract:
:Leishmania parasites cycle between the alimentary tract of a sandfly vector as free-living promastigotes and the acidified phagolysosomes of the vertebrate host macrophage as aflagellated amastigotes. The differentiation process can be mimicked in host-free culture by switching promastigotes (e.g. 25 degrees C, neutral pH) to a phagolysosomal-like environment (e.g. 37 degrees C, acidic pH and 5% CO(2)) for certain, but not all Leishmania species. Axenically grown amastigotes have been shown to share several morphological and biochemical characteristics with macrophage-derived intracellular amastigotes. In this study, we used a DNA oligonucleotide full-genome array to compare global RNA expression profiling of Leishmania infantum axenic amastigotes to intracellular amastigotes derived from infected macrophages. In general, 40% more genes (518 genes vs. 309 genes) were found upregulated in axenic amastigotes compared to intracellular amastigotes. Comparisons in expression profiling between axenic amastigotes and intracellular amastigotes revealed substantial differences in regulated mRNA abundance. Remarkably, among the differentially upregulated transcripts only 12% were common to both amastigote preparations. The major differences between axenic and intracellular amastigotes were observed in metabolic process, especially in fatty acid metabolism, in intracellular transport and membrane vesicular fusion, in proteolysis, in the number and type of protein kinases and RNA binding proteins and in the response to oxidative stress. These findings highlight the importance of the host macrophage in driving the parasite to specific adaptations, which consequently result in highly regulated changes in gene expression.
journal_name
Mol Biochem Parasitoljournal_title
Molecular and biochemical parasitologyauthors
Rochette A,Raymond F,Corbeil J,Ouellette M,Papadopoulou Bdoi
10.1016/j.molbiopara.2008.12.012subject
Has Abstractpub_date
2009-05-01 00:00:00pages
32-47issue
1eissn
0166-6851issn
1872-9428pii
S0166-6851(09)00005-Xjournal_volume
165pub_type
杂志文章abstract::A family of Schistosoma mansoni proteins (18-22 kDa, pI 5.3-5.8) are biosynthesized in juvenile worms and immunoprecipitated by antibodies uniquely present in protective Fischer rat antiserum. A cDNA clone, lambda gt11-40, expressing epitopes common to this protein family was used to obtain a genomic DNA clone, by hyb...
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doi:10.1016/0166-6851(91)90132-p
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journal_title:Molecular and biochemical parasitology
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更新日期:2006-11-01 00:00:00
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journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/j.molbiopara.2007.12.004
更新日期:2008-05-01 00:00:00
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pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:2020-07-01 00:00:00
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journal_title:Molecular and biochemical parasitology
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pub_type: 杂志文章
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更新日期:2008-08-01 00:00:00
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journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
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更新日期:2010-10-01 00:00:00
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journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
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更新日期:2000-02-05 00:00:00
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pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:1995-10-01 00:00:00
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更新日期:2004-10-01 00:00:00
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pub_type: 杂志文章
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更新日期:2012-02-01 00:00:00
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pub_type: 杂志文章
doi:10.1016/s0166-6851(99)00101-2
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pub_type: 杂志文章,评审
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
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更新日期:2008-12-01 00:00:00
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journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
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更新日期:2005-12-01 00:00:00
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更新日期:1981-12-31 00:00:00