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The Journal of Immunology, Vol 143, Issue 7 2328-2335, Copyright © 1989 by American Association of Immunologists

ARTICLES

Murine cell lines stably expressing the influenza virus hemagglutinin gene introduced by a recombinant retrovirus vector are constitutive targets for MHC class I- and class II-restricted T lymphocytes

KB Eager, CJ Hackett, WU Gerhard, J Bennink, LC Eisenlohr, J Yewdell and RP Ricciardi
Wistar Institute of Anatomy and Biology, Philadelphia, PA 19104.

A retrovirus vector containing the hemagglutinin (HA) gene of influenza virus was constructed and used to infect murine cell lines of fibroblast, mastocytoma and B cell lineages which are able to present antigens to MHC-restricted T cells. Stable cell lines were selected in which the retrovirus vector integrated as a single copy in almost all of the individual cell clones examined. The HA mRNA was shown to be of the expected length by Northern blot analysis, but the levels varied among the cell clones. Although the HA transcript was difficult to detect in any of the retrovirus-infected cell clones derived from fibroblasts, HA Ag was easily detected on the cell surface by cytofluorographic analysis. Significantly, retrovirus-infected clones derived from each cell type were recognized by HA-specific class I and class II MHC-restricted T lymphocytes. HA produced in these cells was able to be acquired, processed, and presented to class II-restricted T cells by additional, non-HA-expressing APC. This indicates that HA endogenously synthesized within these cell lines is available for Ag processing by an exogenous route.


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