Article
作者: Beaumont, Maribel ; Sicard, Eric ; Van Dyck, Kristien ; Decaesteker, Tatjana ; Scheid, Johannes F ; Higginson-Scott, Nathan ; Nieddu, Garrett ; Paul, Erina ; Sutradhar, Santosh ; Pang, Ling ; Shah, Ketal ; Rottey, Sylvie ; Agarwal, Shiuli ; Mendez, Luis ; Cote, Josee ; Otipoby, Kevin L ; Franco-Dilone, Lucia ; Laethem, Tine ; Wnek, Richard ; Contreras, Alejandra Virginia ; Bueters, Tjerk ; Kim, Nancy ; Viney, Joanne L ; Lemoine, Lieselotte ; Stoch, S Aubrey ; Larson, Patrick ; Sundy, John S ; Kis-Toth, Katalin ; Love-Gregory, Latisha ; Cunningham-Bussel, Kiki ; Baltus, Gretchen A ; Iwamoto, Marian ; Zhao, Xuemei ; Robbins, Jonathan A ; Lai, Eseng
Abstract:MK-6194, an interleukin-2 mutein designed to selectively activate regulatory T cells (Tregs), was evaluated for safety, pharmacokinetics (PK), immunogenicity, and pharmacodynamics in healthy participants. In a single ascending dose trial (N = 56), participants received subcutaneous MK-6194 or placebo (3:1 ratio) across dose levels ranging from 1 to 10 mg. In a multiple ascending dose trial (N = 54), participants received subcutaneous MK-6194 or placebo (3:1 ratio) at dose levels ranging from 0.5 to 5 mg every 2 wk (total 3 doses) as well as 5 mg every 4 wk (total 2 doses). Baseline characteristics were comparable between trials, with participants mostly male with a mean age of 36 yr. There were no serious adverse events or dose-limiting toxicities. The most common adverse events were injection site erythema and eosinophil count elevations (with no indication of severe eosinophilia or eosinophilia-related organ damage). PK showed dose-proportionality and repeated doses of MK-6194 did not result in accumulation or time-dependent PK. Immunogenicity was low with no impact on PK or safety. Treg expansion as assessed by flow cytometry and Treg-specific demethylation region analysis was observed in a dose-dependent manner during both trials and expanded within about 8 d postdose up to about 5-fold and returned to baseline by 14 to 29 d postdose. Minimal impact was observed on other lymphocytes including total T lymphocyte and natural killer cell counts. These findings support the further development of MK-6194 as a potential treatment for autoimmune disorders.