Abstract: The invention provides compositions and methods for inhibiting fractionation of immunoglobulins comprising a lambda light chain based on the observation that iron, in the presence of histidine, results in increased fragmentation of a recombinant fully human IgG molecule containing a lambda light chain due to cleavage in the hinge region. The invention further provides an aqueous pharmaceutical formulation comprising an antibody, or antigen-binding portion thereof, that binds the p40 subunit of IL-12/IL-23 and a buffer system comprising histidine, wherein the formulation has enhanced stability, including enhanced resistance to fragmentation.

Abstract: The present invention provides compositions of antibodies, e.g., human antibodies, of varying glycosylation structures that serve to achieve desired rates of serum clearance. The invention also provides methods for modulating the pharmacokinetics of antibodies, e.g., human antibodies, and therapeutic compositions containing such antibodies. These methods rely on varying the glycosylation structures of the antibodies, e.g., human antibodies, to achieve desired rates of serum clearance.