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Developmental Immunology
Volume 5 (1997), Issue 2, Pages 115-120
Short Communication

Both IFN-γ and IL-4 Induce MHC Class II Expression at the Surface of Mouse Pro-B Cells

1Laboratoire de Génétique Moléculaire des Eucaryotes du CNRS et Unité 184 de ľ INSERM, Institut de Chimie Biologique, 11 rue Humann, Strasbourg 67085, France
2Basel Institute for Immunology, 487 Grenzacherstrasse, Basel CH-4005, Switzerland

Received 4 December 1995; Accepted 20 November 1996

Copyright © 1997 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Pro-B cells are early B-cell progenitors that retain macrophage potential. We have studied MHC class II molecules and invariant chain inducibility on four class II negative mouse pro- B-cell clones. We analyzed the effects of IL-4 and IFN-γ, which represent the major inducers of class II in the B-lymphoid and monocytic/macrophage lineages, respectively. After 48 h of treatment with either cytokine, three pro-B-cell clones (C2.13, A1.5, and F2.2) expressed intracellular invariant chain and cell-surface class II molecules. One clone (D2.1) remained negative. As already reported, more differentiated 70Z/3 pre-B cells were inducible by IL-4 only. These data suggest that the induction of class II and invariant-chain genes are subject to regulation throughout B-cell differentiation.