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| Clustering and redistribution of late endocytic compartments in response to Helicobacter pylori vacuolating toxin |
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| Author(s): Li Y, Wandinger-Ness A, Goldenring JR, Cover TL |
| Source: MOLECULAR BIOLOGY OF THE CELL Volume: 15 Issue: 4 Pages: 1946-1959 Published: APR 2004 |
| Times Cited: 25 References: 66 |
| Abstract: Helicobacter pylori VacA is a secreted protein toxin that may contribute to the pathogenesis of peptic ulcer disease and gastric adenocarcinoma. When added to cultured mammalian cells in the presence of weak bases (e.g., ammonium chloride), VacA induces the formation of large cytoplasmic vacuoles. Here, we report a previously unrecognized capacity of VacA to induce clustering and perinuclear redistribution of late endocytic compartments. In contrast to VacA-induced cell vacuolation, VacA-induced clustering and redistribution of late endocytic compartments are not dependent on the presence of weak bases and are not inhibited by bafilomycin A1. VacA mutant toxins defective in the capacity to form anion-selective membrane channels fail to cause clustering and redistribution. VacA-induced clusters of late endocytic compartments undergo transformation into vacuoles after the addition of ammonium chloride. VacA-induced clustering and redistribution of late endocytic compartments occur in cells expressing wild-type or constitutively active Rab7, but not in cells expressing dominant-negative mutant Rab7. In VacA-treated cells containing clustered late endocytic compartments, overexpression of dominant-negative Rab7 causes reversion to a nonclustered distribution. Redistribution of late endocytic compartments to the perinuclear region requires a functional microtubule cytoskeleton, whereas clustering of these compartments and vacuole formation do not. These data provide evidence that clustering of late endocytic compartments is a critical mechanistic step in the process of VacA-induced cell vacuolation. We speculate that VacA-induced alterations in late endocytic membrane traffic contribute to the capacity of H. pylori to persistently colonize the human gastric mucosa. |
| Document Type: Article |
| Language: English |
| Reprint Address: Cover, TL (reprint author), Vanderbilt Univ, Sch Med, Dept Microbiol & Immunol, 221 Kirkland Hall, Nashville, TN 37232 USA |
Addresses:
1. Vanderbilt Univ, Sch Med, Dept Microbiol & Immunol, Nashville, TN 37232 USA
2. Vanderbilt Univ, Sch Med, Dept Surg, Nashville, TN 37232 USA
3. Vanderbilt Univ, Sch Med, Dept Cell & Dev Biol, Nashville, TN 37232 USA
4. Vanderbilt Univ, Sch Med, Dept Med, Nashville, TN 37232 USA
5. Vet Affairs Med Ctr, Nashville, TN 37212 USA
6. Univ New Mexico, Sch Med, Dept Pathol, Albuquerque, NM 87131 USA |
| Publisher: AMER SOC CELL BIOLOGY, 8120 WOODMONT AVE, STE 750, BETHESDA, MD 20814-2755 USA |
| Subject Category: Cell Biology |
| IDS Number: 806RK |
| ISSN: 1059-1524 |
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