Infectious Adenovirus Type 2 Transport Through Early but not Late Endosomes

Traffic - Tập 9 Số 12 - Trang 2265-2278 - 2008
Michele Gastaldelli1, Nicola Imelli1, Karin Boucke1, Beat Amstutz1, Oliver Meier2, Urs F. Greber1
1Institute of Zoology, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
2Current address: Roche Pharma AG, Schoenmattstrasse 2, CH‐4153 Reinach, Switzerland

Tóm tắt

Receptor‐mediated endocytosis is a major gate for pathogens into cells. In this study, we analyzed the trafficking of human adenovirus type 2 and 5 (Ad2/5) and the escape‐defective temperature‐sensitive Ad2‐ts1 mutant in epithelial cancer cells. Ad2/5 and Ad2‐ts1 uptake into endosomes containing transferrin, major histocompatibility antigen 1 and the Rab5 effector early endosome antigen 1 (EEA1) involved dynamin, amphiphysin, clathrin and Eps15. Cointernalization experiments showed that most of the Ad2/5 and Ad2‐ts1 visited the same EEA1‐positive endosomes. In contrast to Ad2/5, Ad2‐ts1 required functional Rab5 for endocytosis and lysosomal transport and was sensitive to the phosphatidyl‐inositol‐3 (PI3)‐kinase inhibitor wortmannin or the ubiquitin‐binding protein Hrs for sorting from early to late endosomes. Endosomal escape of Ad2 was not affected by incubation at 19°C, which blocked membrane sorting in early endosomes and inhibited Ad2‐ts1 transport to lysosomes. Unlike Semliki Forest Virus (SFV), sorting of Ad2‐ts1 to late endosomes was independent of Rab7 and Ad2/5 infection independent of EEA1. The data indicate that Ad2/5 and Ad2‐ts1 use an invariant machinery for clathrin‐mediated uptake to early endosomes. We suggest that the infectious Ad2 particles are either directly released from early endosomes to the cytosol or sorted by a temperature‐insensitive and PI3‐kinase‐independent mechanism to an escape compartment different from late endosomes or lysosomes.

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