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Cross-presentation, dendritic cells, tolerance and immunity.

W R Heath¹, F R Carbone

¹Immunology Division, The Walter and Eliza Hall Institute, Post Office Royal Melbourne Hospital, Parkville, Victoria 3052, Australia. heath@wehi.edu.au

Annual Review of Immunology

|March 13, 2001

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This review explores how cross-presentation shapes immune tolerance and immunity. It details antigen requirements, antigen-presenting cell phenotypes, and molecular signals influencing immune responses.

Area of Science:

Immunology
Cellular Biology

Background:

Cross-presentation is a critical process where exogenous antigens are presented on MHC class I molecules.
This process is essential for initiating adaptive immune responses, particularly against viral infections and tumors.

Purpose of the Study:

To review the multifaceted role of cross-presentation in establishing immune tolerance and immunity.
To consolidate current knowledge on the cellular and molecular mechanisms governing cross-presentation.

Main Methods:

Literature review synthesizing existing research on cross-presentation.
Analysis of antigenic requirements, antigen-presenting cell (APC) phenotypes, and cellular interactions.
Discussion of molecular signals directing immune outcomes.

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Main Results:

Cross-presentation involves specific antigenic requirements and is performed by specialized antigen-presenting cells (APCs).
Cellular interactions and molecular signals critically determine whether cross-presentation leads to tolerance or immunity.
A comprehensive understanding of the cross-presenting APC is central to this process.

Conclusions:

Cross-presentation is a key regulatory mechanism in adaptive immunity and immune tolerance.
Further research into the cross-presenting APC can elucidate strategies for modulating immune responses.