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- W1556222047 abstract "Abstract Pertussis toxin (PTx), an exotoxin of Bordetella pertussis has been used as a molecular probe to study stimulus-response coupling in a wide variety of cells. We have previously shown that PTx activates the same signal transduction pathways as Ag or mAb directed against the CD3-T cell Ag receptor complex in human T cells. Because the EC50 for mitogenic stimulation by PTx was 1.7 nM, we suspected that the toxin was specifically interacting with a membrane protein or receptor. We have used both chemical cross-linking and Western blotting techniques to demonstrate that PTx shows specific binding to a 43 kDa-membrane protein on cells that respond to PTx by rapid second messenger production. The PTx receptor can be detected in both the E6-1 Jurkat cell line and a CD3-TCR-negative Jurkat line, demonstrating that it is not coordinately expressed with the Ag receptor complex. The 43 kDa-protein is also found in the HPB-ALL human T cell line and PBL, but not in a murine T cell hybridoma or human neutrophils, both of which are unresponsive to PTx activation. These data suggest that the biochemical basis for the mitogenic activity of PTx may lie in its binding to a specific membrane receptor that is capable of transmitting an activation signal." @default.
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- W1556222047 date "1990-07-15" @default.
- W1556222047 modified "2023-09-25" @default.
- W1556222047 title "Identification of a 43-kilodalton human T lymphocyte membrane protein as a receptor for pertussis toxin." @default.
- W1556222047 doi "https://doi.org/10.4049/jimmunol.145.2.678" @default.
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