The Journal of Experimental Medicine
ThymUS '08
  Home | Help | Feedback | Subscriptions | Archive | Search | Table of Contents

Published online 13 November 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 Heibein, J. A.
Right arrow Articles by Bleackley, R. C.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Heibein, J. A.
Right arrow Articles by Bleackley, R. C.
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, 0022-1007/2000/11/1391/ $5.00
The Journal of Experimental Medicine, Volume 192, Number 10, November 20, 2000 1391-1402


Original Article

Granzyme B–mediated Cytochrome c Release Is Regulated by the Bcl-2 Family Members Bid and Bax

Jeffrey A. Heibeina, Ing Swie Gopinga, Michele Barryb, Michael J. Pinkoskic, Gordon C. Shored, Douglas R. Greenc, and R. Chris Bleackleya
a Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada
b Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta T6G 2H7, Canada
c Division of Cellular Immunology, La Jolla Institute for Allergy and Immunology, San Diego, California 92121
d Department of Biochemistry, McGill University, Montreal, Quebec H3G 1Y6, Canada

Correspondence to: R. Chris Bleackley, Dept. of Biochemistry, 463 Medical Sciences Bldg., University of Alberta, Edmonton, Alberta T6G 2H7, Canada. Tel:780-492-3968 Fax:780-492-0886

Cytotoxic T lymphocytes (CTLs) destroy target cells through a mechanism involving the exocytosis of cytolytic granule components including granzyme B (grB) and perforin, which have been shown to induce apoptosis through caspase activation. However, grB has also been linked with caspase-independent disruption of mitochondrial function. We show here that cytochrome c release requires the direct proteolytic cleavage of Bid by grB to generate a 14-kD grB-truncated product (gtBid) that translocates to mitochondria. In turn, gtBid recruits Bax to mitochondria through a caspase-independent mechanism where it becomes integrated into the membrane and induces cytochrome c release. Our results provide evidence for a new pathway by which CTLs inflict damage and explain the caspase-independent mechanism of mitochondrial dysfunction.

Key Words: cytotoxic T lymphocyte, granzyme B, Bcl-2, Bid, Bax


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