US Patent:
20110229489, Sep 22, 2011
Inventors:
Jaume Pons - San Bruno CA, US
Jeffrey Raymond Chabot - Medford MA, US
Javier Fernando Chaparro Riggers - San Mateo CA, US
Bruce Charles Gomes - Ashburnham MA, US
Hong Liang - San Francisco CA, US
Kapil Mayawala - Peabody MA, US
Arvind Rajpal - San Francisco CA, US
David Louis Shelton - Oakland CA, US
International Classification:
A61K 39/395
C07K 16/00
C07K 16/40
C07K 16/42
C07K 16/18
C07H 21/04
A61P 3/06
C40B 40/10
C12N 5/10
C12N 1/00
US Classification:
4241581, 5303871, 5303917, 5303891, 5303872, 5303892, 4241301, 5303873, 536 2353, 506 18, 435325, 435243
Abstract:
The present invention relates to antibodies with pH dependent binding to its antigen such that the affinity for antigen binding at physiological pH (i.e., pH 7.4) is greater than at endosomal pH (i.e., pH 6.0 or 5.5). In other words, the Kor kratio at pH 5.5/pH 7.4 or at pH 6.0/pH 7.4 is more than, or ranges between, 2, 3, 4, 8, 10, 16, 20, 30, 40, or 100 or more. Such pH dependent antibodies preferentially dissociate from the antigen in the endosome. This can increase antibody half life, as compared to antibodies with equivalent Ks at pH 7.4 but with no pH dependent binding, when the antigen is one that undergoes antigen-mediated clearance (e.g., PCSK9). Antibodies with pH dependent binding can decrease total antigen half life when the antigen undergoes reduced clearance when bound to antibody (e.g., IL6). Antibodies with pH dependent binding can also prolong the decrease in antigen which is not antibody-bound. This can be important when antagonizing a target antigen typically present at high levels (e.g., IgE, DKK1, C5 and SOST). In addition, such antibodies can increase antigen half life when the antigen is a receptor and the receptor has increased clearance when bound to antibody (e.g, GMCSF receptor).