Modified binding molecules specific for T or B lymphocytes and their use as in vivo immune modulators

US6106835A · kind A · utility

Assignee

• TANOX, INC. · US

Inventor

• Tse-Wen Chang · Houston, US

Key dates

• Filing date: Jan 28, 1993
• Grant date: Aug 22, 2000
• Expiry date: Jan 28, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07K2317/74
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Several forms of immunoregulatory substances are derived from monoclonal antibodies (MAbs) that are specific for a T or B cell surface antigen, such as CD3, TCR, CD4, or CD8 on T cells or membrane-bound immunoglobulins on B cells. The substances include: a mixture of F(ab').sub.2 fragments (or other divalent binding molecules which lack Fc) which each bind noncompetitively to different monovalent antigenic epitopes on the same antigen; the F(ab').sub.2 fragment (or other divalent binding molecules which lack Fc) of a bispecific antibody which has each of its binding sites derived from one of the two MAbs that bind noncompetitively to monovalent antigenic epitopes on the same antigen; a conjugate including a polymeric backbone, such as polyethylene glycol ("PEG"), cellulose, dextran, agarose, or an amino acid copolymer or a liposome, that is coupled with the binding molecules, e.g., Fv, Fab, or F(ab').sub.2, which bind noncompetitively to monovalent antigenic epitopes on the same antigen.