The disclosure provides compositions and methods relating to or derived from anti-
activin A binding proteins, including antibodies. In particular embodiments, the disclosure provides fully human, humanized, and chimeric anti-
activin A antibodies that bind human
activin A, activin A-binding fragments and derivatives of such antibodies, and activin A-binding polypeptides comprising such fragments. Other embodiments provide nucleic acids encoding such antibodies,
antibody fragments and derivatives and polypeptides, cells comprising such polynucleotides, methods of making such antibodies,
antibody fragments and derivatives and polypeptides, and methods of using such antibodies,
antibody fragments and derivatives and polypeptides, including methods of treating or diagnosing subjects having activin A-related disorders or conditions including
cachexia related to gonadal
cancer, other cancers,
rheumatoid arthritis, and other diseases.