JCB logo
PeproTech: Cell Culture Supplements
  Home | Help | Feedback | Subscriptions | Archive | Search | Table of Contents

This Article
Right arrow Full Text
Right arrow Full Text (PDF, 344K)
Right arrow PPT slides of all figures
Right arrow Alert me when this article is cited
Right arrow Citation Map
Services
Right arrow Email this article
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new content in the JCB
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via CrossRef
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Puertollano, R.
Right arrow Articles by Alonso, M. A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Puertollano, R.
Right arrow Articles by Alonso, M. A.
Social Bookmarking
 Add to CiteULike   Add to Complore   Add to Connotea   Add to Del.icio.us   Add to Digg   Add to Facebook   Add to Reddit   Add to Technorati   Add to Twitter  
What's this?

© The Rockefeller University Press, 0021-9525/1999//141 $5.00
The Journal of Cell Biology, Volume 145, Number 1, , 1999 141-151


Regular Articles

The MAL Proteolipid Is Necessary for Normal Apical Transport and Accurate Sorting of the Influenza Virus Hemagglutinin in Madin-Darby Canine Kidney Cells



Rosa Puertollano*, Fernando Martín-Belmonte*, Jaime Millán*, María del Carmen de Marco*, Juan P. Albar{ddagger}, Leonor Kremer{ddagger}, and Miguel A. Alonso*

* Centro de Biología Molecular "Severo Ochoa," Universidad Autónoma de Madrid and Consejo Superior de Investigaciones Científicas, and {ddagger} Department of Immunology and Oncology, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049-Madrid, Spain

The MAL (MAL/VIP17) proteolipid is a nonglycosylated integral membrane protein expressed in a restricted pattern of cell types, including T lymphocytes, myelin-forming cells, and polarized epithelial cells. Transport of the influenza virus hemagglutinin (HA) to the apical surface of epithelial Madin-Darby canine kidney (MDCK) cells appears to be mediated by a pathway involving glycolipid- and cholesterol- enriched membranes (GEMs). In MDCK cells, MAL has been proposed previously as being an element of the protein machinery for the GEM-dependent apical transport pathway. Using an antisense oligonucleotide-based strategy and a newly generated monoclonal antibody to canine MAL, herein we have approached the effect of MAL depletion on HA transport in MDCK cells. We have found that MAL depletion diminishes the presence of HA in GEMs, reduces the rate of HA transport to the cell surface, inhibits the delivery of HA to the apical surface, and produces partial missorting of HA to the basolateral membrane. These effects were corrected by ectopic expression of MAL in MDCK cells whose endogenous MAL protein was depleted. Our results indicate that MAL is necessary for both normal apical transport and accurate sorting of HA.

Key Words: apical transport • glycolipid-enriched membranes • sorting • Madin-Darby canine kidney cells • proteolipids



Abbreviations used in this paper: d, dog; GEM, glycolipid- and cholesterol-enriched membrane; h, human; HA, hemagglutinin; MDCK, Madin-Darby canine kidney; sulfo-NHS-biotin, sulfo-N-hydroxyl-succinimido-biotin.

R. Puertollano and F. Martín-Belmonte are recipients of predoctoral fellowships from the Comunidad de Madrid. J. Millán and M. de Marco are supported by predoctoral fellowships from the Ministerio de Educación y Cultura. This work was supported by grants from the Dirección General de Enseñanza Superior (PM96-0004) and the Comunidad de Madrid (08.3/ 0020/1998). The Department of Immunology and Oncology is funded and supported by the Consejo Superior de Investigaciones Científicas and Pharmacia & Upjohn. An institutional grant from the Fundación Ramón Areces to Centro de Biología Molecular "Severo Ochoa" is also acknowledged.



Add to CiteULike CiteULike   Add to Complore Complore   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Facebook Facebook   Add to Reddit Reddit   Add to Technorati Technorati   Add to Twitter Twitter    What's this?


This article has been cited by other articles:



  Home | Help | Feedback | Subscriptions | Archive | Search | Table of Contents