The Journal of Experimental Medicine
Janeway's Immunobiology 7th Edition
  Home | Help | Feedback | Subscriptions | Archive | Search | Table of Contents

Published online 11 September 2000.
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
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 JEM
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 Nanda, N. K.
Right arrow Articles by Sant, A. J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Nanda, N. K.
Right arrow Articles by Sant, A. J.
Social Bookmarking
 Add to CiteULike   Add to Complore   Add to Connotea   Add to Del.icio.us   Add to Digg   Add to Reddit   Add to Technorati  
What's this?
© The Rockefeller University Press, 0022-1007/2000/9/781/ $5.00
The Journal of Experimental Medicine, Volume 192, Number 6, September 18, 2000 781-788


Original Article

DM Determines the Cryptic and Immunodominant Fate of T Cell Epitopes

Navreet K. Nandaa and Andrea J. Santb
a Department of Microbiology and Immunology, University of Illinois at Chicago, Chicago, Illinois 60612
b Department of Pathology, University of Chicago, Chicago, Illinois 60637

Correspondence to: Navreet K. Nanda, Department of Microbiology and Immunology, 835 South Wolcott Ave., Chicago, IL 60612-7344. Tel:312-413-1446 Fax:312-996-6415 E-mail:navreetn{at}uic.edu.

The ability of the immune system to focus T cell responses against a select number of potential epitopes of a complex antigen is termed immunodominance. Epitopes that trigger potent T cell activation, after in vivo priming, are classified as immunodominant. By contrast, determinants that fail to elicit any response are called cryptic. DM, a major histocompatibility complex (MHC) heterodimer, plays a pivotal role in the presentation of MHC class II–restricted epitopes by catalyzing the exchange of class II–associated invariant chain peptide with the antigen-derived peptides within the MHC class II binding groove. Using L cells transfected with genes for MHC class II, invariant chain, and DM, we have studied the contribution of DM in the presentation of two cryptic (peptide 11–25 and peptide 20–35) and one dominant (peptide 106–116) epitope of hen egg white lysozyme (HEL). Cells lacking DM heterodimers efficiently display the determinants HEL 11–25 and HEL 20–35 to T cells. Strikingly, however, cells expressing DM are severely compromised in their ability to present the cryptic HEL 11–25/Ad and 20–35/Ad epitopes. DM-mediated antagonism of HEL 11–25/Ad and 20–35/Ad presentation could thus be central to 11–25/Ad and 20–35/Ad being cryptic epitopes in the HEL system. Interestingly, the display of the immunodominant epitope of HEL, 106–116/Ed, and of a dominant epitope of sperm whale myoglobin (SWM), 102–118/Ad, is entirely dependent on the expression of DM. Thus, cells lacking DM molecules are unable to efficiently express HEL 106–116/Ed and SWM 102–118/Ad determinants. We conclude that the DM heterodimers direct the immunodominant and cryptic fate of antigenic epitopes in vivo.

Key Words: antigen determinant, antigen processing, H-2M, immunodominance, major histocompatibility complex class II


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 Reddit Reddit   Add to Technorati Technorati    What's this?


This article has been cited by other articles:



  Home | Help | Feedback | Subscriptions | Archive | Search
TABLE OF CONTENTS