Detection of Sotatercept (ACE-011) in human serum by SAR-PAGE and western single blotting

Christian Reichel*, Letizia Farmer, Günter Gmeiner, Katja Walpurgis, Mario Thevis

*Corresponding author for this work

Publication: Contribution to journalJournal articlesResearchpeer-review


A method for the detection of Sotatercept (ACE-011, ACVR2A-Fc) in human serum is presented. The method is a modification of a recently published protocol for Luspatercept (ACE-536, ACVR2B-Fc), another erythropoiesis stimulating fusion protein. Out of 27 tested antibodies against either the extracellular domain of ACVR2A or the full-length protein, only 4 antibodies bound strongly enough to Sotatercept for usage with immunoprecipitation followed by SAR-PAGE and Western single blotting. The adapted protocol allows the detection of 0.1 ng/mL Sotatercept in just 50 μL human serum. None of the 3 commercial ACVR2-ELISAs was able to detect Sotatercept and the 2 tested surrogate proteins, even in the μg/mL range. As for Luspatercept, only IPG-IEF/2D-PAGE generated discrete isoforms. Due to the long serum half-life, the SAR-PAGE method will be able to detect Sotatercept for several weeks and will be very useful in doping testing.

Original languageEnglish
JournalDrug testing and analysis
Issue number6
Pages (from-to)927-937
Number of pages11
Publication statusPublished - 2018

Research areas and keywords

  • Journal Article


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