𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Intracellular antibody-mediated immunity and the role of TRIM21

✍ Scribed by William A. McEwan; Donna L. Mallery; David A. Rhodes; John Trowsdale; Leo C. James

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
176 KB
Volume
33
Category
Article
ISSN
0265-9247

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✦ Synopsis

Abstract

Protection against bacterial and viral pathogens by antibodies has always been thought to end at the cell surface. Once inside the cell, a pathogen was understood to be safe from humoral immunity. However, it has now been found that antibodies can routinely enter cells attached to viral particles and mediate an intracellular immune response. Antibody‐coated virions are detected inside the cell by means of an intracellular antibody receptor, TRIM21, which directs their degradation by recruitment of the ubiquitin‐proteasome system. In this article we assess how this discovery alters our view of the way in which antibodies neutralise viral infection. We also consider the antiviral function of TRIM21 in the context of its other reported roles in immune signalling and autoimmunity. Finally, we discuss the conceptual implications of intracellular antibody immunity and how it alters our view of the discrete separation of extracellular and intracellular environments.

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