論文 - 詳細
| RRC ID | 29096 |
|---|---|
| 著者 | Peracino B, Balest A, Bozzaro S. |
| タイトル | Phosphoinositides differentially regulate bacterial uptake and Nramp1-induced resistance to Legionella infection in Dictyostelium. |
| ジャーナル | J Cell Sci |
| Abstract |
Membrane phosphatidylinositides recruit cytosolic proteins to regulate phagocytosis, macropinocytosis and endolysosomal vesicle maturation. Here, we describe effects of inactivation of PI3K, PTEN or PLC on Escherichia coli and Legionella pneumophila uptake by the professional phagocyte Dictyostelium discoideum. We show that L. pneumophila is engulfed by macropinocytosis, a process that is partially sensitive to PI3K inactivation, unlike phagocytosis of E. coli. Both processes are blocked by PLC inhibition. Whereas E. coli is rapidly digested, Legionella proliferates intracellularly. Proliferation is blocked by constitutively expressing Nramp1, an endolysosomal iron transporter that confers resistance against invasive bacteria. Inactivation of PI3K, but not PTEN or PLC, enhances Legionella infection and suppresses the protective effect of Nramp1 overexpression. PI3K activity is restricted to early infection and is not mediated by effects on the actin cytoskeleton; rather L. pneumophila, in contrast to E. coli, subverts phosphoinositide-sensitive fusion of Legionella-containing macropinosomes with acidic vesicles, without affecting Nramp1 recruitment. A model is presented to explain how Legionella escapes fusion with acidic vesicles and Nramp1-induced resistance to pathogens. |
| 巻・号 | 123(Pt 23) |
| ページ | 4039-51 |
| 公開日 | 2010-12-1 |
| DOI | 10.1242/jcs.072124 |
| PII | jcs.072124 |
| PMID | 21045112 |
| MeSH | Cation Transport Proteins / genetics Cation Transport Proteins / metabolism* Dictyostelium / enzymology Dictyostelium / genetics Dictyostelium / microbiology* Dictyostelium / physiology* Escherichia coli / physiology Legionella pneumophila / physiology* Phagocytosis* Phosphatidylinositol 3-Kinases / genetics Phosphatidylinositol 3-Kinases / metabolism Phosphatidylinositols / metabolism* Protozoan Proteins / genetics Protozoan Proteins / metabolism* Type C Phospholipases / genetics Type C Phospholipases / metabolism |
| IF | 4.573 |
| 引用数 | 36 |
| WOS 分野 | CELL BIOLOGY |
| オルトメトリクス指標 |
オルトメトリクス指標項目
|
| 最多言及媒体 | F1000Research |
| 各媒体での言及数の合計 | 1 |
| 過去6か月間でのオルトメトリクス指標の変動値 | 0.0 |
| リソース情報 | |
| 細胞性粘菌 | S00406 S90292 |