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Quantitative control of MHC class II expression by the transactivator CIITA

✍ Scribed by Luc Alain Otten; Viktor Steimle; Séverine Bontron; Bernard Mach

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
125 KB
Volume
28
Category
Article
ISSN
0014-2980

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✦ Synopsis

Activation of T lymphocytes is quantitatively controlled by the level of expression of MHC class II molecules. Both constitutive and inducible expression of MHC class II genes is regulated by the transactivator CIITA, which is itself tightly regulated. Since the level of MHC class II molecules expressed is a functionally essential parameter, it was of interest to explore whether MHC class II expression is quantitatively controlled by the level of the transactivator. This report shows that in a variety of experimental conditions one does indeed observe, in both mouse and man, a quantitative control of MHC class II expression by the level of CIITA. This relationship between the regulator gene, which behaves as a rate-limiting factor, and its target genes clarifies our understanding of the quantitative modulation of MHC class II expression, and thus of T lymphocyte activation.

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