The immune system has the remarkable ability to defend againstdiverse microbial pathogens and yet not to respond to self.T cells are key mediators of the immune response, and theiractivation is tightly regulated to prevent autoreactivity. Theprocesses of T-cell activation and self-tolerance are thereforepotential targets for manipulation by drugs hence, therecent phase 1 trial of a "superagonistic" monoclonal anti-CD28antibody that was conducted in Britain on behalf of the Germanfirm TeGenero, with the unexpected and devastating results describedby Suntharalingam et al. in this issue of the Journal (pages10181028).
This article was published at www.nejm.org on August 14, 2006.
Dr. Sharpe is a professor of pathology at Harvard Medical School, Boston. Dr. Abbas is a professor and chair of the Department of Pathology at the University of California, San Francisco, San Francisco.
Related Letters:
T-Cell Costimulation
Wise M. P., Gallimore A., Godkin A., Colaco C. A.L.S., Sharpe A., Abbas A.
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N Engl J Med 2006;
355:2594-2595, Dec 14, 2006.
Correspondence
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