Washington University

Michelle Becker-Hapak

Ted H Hansen

Gerald Linette

Single chain trimer (SCT) molecules are disclosed, comprising an MHC antigen peptide sequence, a &#x3b2;-microglobulin sequence and a full-length MHC class I heavy chain sequence, joined by linker sequences. Further described are nucleic acids encoding single chain trimers. Methods for expansion of antigen-specific T cell populations using single chain trimer molecules are also disclosed. In some configurations, these methods comprise co-culturing, in a first stage, CD8+ T cells from a donor with antigen presenting cells comprising an MHC antigen peptide, and co-culturing, in a second stage, the CD8+ T cells with cells comprising an SCT which has an MHC antigen peptide sequence identical to the sequence of the antigen peptide in the first stage. The methods can provide 10,000-100,000 fold expansion of antigen-specific CD8+ T cells within about 28 days after establishing culture, and can yield over 1 billion antigen-specific CD8+ T cells expanded from an individual donor.

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St. Louis, MO, United States of America

Michelle Becker-Hapak