The routes used by antigen-presenting cells (APC) to convert the transmembrane fusion glycoprotein (F) of measles virus (MV) to HLA class I and class II presentable peptides have been examined, using cloned cytotoxic T lymphocytes in functional assays. Presentation by Epstein-Barr virus-transformed B lymphoblastoid cell lines was achieved using live virus, ultraviolet light-inactivated virus, and purified MV-F delivered either as such or incorporated in immunostimulating complexes (MV-F-ISCOM). Only live virus and MV-F-ISCOM allow presentation by class I molecules, while all antigen preparations permit class II-restricted presentation. We observe presentation of MV-F from live virus and as MV-F-ISCOM by class II molecules in a fashion that is not perturbed by chloroquine. Our studies visualize novel presentation pathways of type I transmembrane proteins.

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The Journal of Experimental Medicine
Erasmus MC: University Medical Center Rotterdam

van Binnendijk, R., van Baalen, C., Poelen, M., de Vries, P., Boes, J., Cerundolo, V., … Uytdehaag, F. (1992). Measles virus transmembrane fusion protein synthesized de novo or presented in iscom is endogenously processed for HLA class I- and class II-restricted cytotoxic T cell recognition. The Journal of Experimental Medicine, 176, 119–128. Retrieved from