Example 12
C5 inhibitory activity was assessed by enzyme immunoassay (EIA). Inhibition of the production of C5a and the membrane attack complex (MAC) were measured by MicroVue EIA kits (Quidel Corporation, San Diego, Calif.).
C5a EIA
Supernatant from a human RBC hemolysis assay of R3002 (SEQ ID NO: 3) and R3008 (SEQ ID NO: 9) was diluted 1:50 and assayed by C5a EIA (FIG. 1). Both polypeptides inhibited the formation of C5a. R3002 (SEQ ID NO: 3) had an IC50 of 5.4 nM, R3008 (SEQ ID NO: 9) had an IC50 of 54.5 nM.
Membrane Attack Complex (MAC) EIA
The MAC EIA was performed on the diluted supernatant (1:5) of R3008 (SEQ ID NO: 9) from a human RBC hemolysis assay (FIG. 2). This polypeptide was shown to inhibit the formation of the MAC with an IC50 of 33 nM.
US10106579B2. Modulation of complement activity (2018-10-23). Ra Pharmaceuticals, Inc. [US]. Inventors: Michelle Denise Hoarty [US], Ketki Ashok Dhamnaskar [US], Daniel Elbaum [US], Kristopher Josephson [US], Kelley Cronin Larson [US], Zhong Ma [US], Nathan Ezekiel Nims [US], Alonso Ricardo [US], Kathleen Seyb [US], Guo-Qing Tang [US], Douglas A. Treco [US], Zhaolin Wang [US], Ping Ye [US], Hong Zheng [US], Sarah Jacqueline Perlmutter [US], Robert Paul Hammer [US].