JCB logo
Quantitative Colocalization Analysis Software
  Home | Help | Feedback | Subscriptions | Archive | Search | Table of Contents

This Article
Right arrow Full Text
Right arrow Full Text (PDF, 738K)
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 Sheets, E. D.
Right arrow Articles by Baird, B.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Sheets, E. D.
Right arrow Articles by Baird, B.
Right arrowPubmed/NCBI databases
*Gene*GEO Profiles
*HomoloGene*UniGene
*Compound via MeSH
*Substance via MeSH
Hazardous Substances DB
*CHOLESTEROL
*L-TYROSINE
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//877 $5.00
The Journal of Cell Biology, Volume 145, Number 4, , 1999 877-887


Regular Articles

Critical Role for Cholesterol in Lyn-mediated Tyrosine Phosphorylation of Fc{varepsilon}RI and Their Association with Detergent-resistant Membranes



Erin D. Sheets, David Holowka, and Barbara Baird

Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853-1301

Tyrosine phosphorylation of the high affinity immunoglobulin (Ig)E receptor (Fc{varepsilon}RI) by the Src family kinase Lyn is the first known biochemical step that occurs during activation of mast cells and basophils after cross-linking of Fc{varepsilon}RI by antigen. The hypothesis that specialized regions in the plasma membrane, enriched in sphingolipids and cholesterol, facilitate the coupling of Lyn and Fc{varepsilon}RI was tested by investigating functional and structural effects of cholesterol depletion on Lyn/Fc{varepsilon}RI interactions. We find that cholesterol depletion with methyl-β-cyclodextrin substantially reduces stimulated tyrosine phosphorylation of Fc{varepsilon}RI and other proteins while enhancing more downstream events that lead to stimulated exocytosis. In parallel to its inhibition of tyrosine phosphorylation, cholesterol depletion disrupts the interactions of aggregated Fc{varepsilon}RI and Lyn on intact cells and also disrupts those interactions with detergent-resistant membranes that are isolated by sucrose gradient ultracentrifugation of lysed cells. Importantly, cholesterol repletion restores receptor phosphorylation together with the structural interactions. These results provide strong evidence that membrane structure, maintained by cholesterol, plays a critical role in the initiation of Fc{varepsilon}RI signaling.

Key Words: methyl-β-cyclodextrin • immunoglobulin E receptor • plasma membrane structure • lipid domains • signal transduction



Abbreviations used in this paper: BSA/BSS, BSA-containing buffered saline solution; DRM, detergent-resistant membrane; GPI, glycosylphosphatidylinositol; HRP, horseradish peroxidase; Lo, liquid-ordered; MβCD, methyl-β-cyclodextrin; TfR, transferrin receptor; TX-100, Triton X-100.

Address correspondence to Barbara Baird or David Holowka, Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, NY 14853-1301. Tel.: (607) 255-4095 or (607) 255-6140. Fax: (607) 255-4137. E-mail: bab13{at}cornell.edu or dah24{at}cornell.edu



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