| 摘要 |
The disclosure relates to a monovalent polypeptide domain which specifically binds CD28, as well as to an antagonist of CD28, where the antagonist comprises a monovalent polypeptide domain which specifically binds CD28. This disclosure encompasses monovalent polypeptide domains comprising an antibody single variable domain that monovalently binds CD28. An antibody single variable domain that is monovalent for binding of CD28 can inhibit CD28 activity. In one aspect, a monovalent anti-CD28 antibody single variable domain consists of or comprises an antibody single variable domain that specifically binds and antagonizes the activity of CD28, in an aspect, without substantially agonizing CD28 activity. In another aspect, the monovalent anti-CD28 antibody single variable domain is a human antibody single variable domain. The disclosure further encompasses methods of antagonizing CD80 and/or CD86 interactions with CD28 in an individual and methods of treating diseases or disorders involving CD80 and/or CD86 interactions with CD28, the methods involving administering a monovalent anti-CD28 antibody single variable domain to the individual.
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