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- W1803149178 abstract "Background and Objectives The occurrence of thromboembolic events (TEEs) with intravenous immunoglobulin lots (IVIGs) raised the question of the causative agent for these adverse events. We investigated the predominant plasma proteases in 19 IVIG lots from five manufacturers including three lots associated with adverse events. Material and Methods The inhibitor profile of the amidolytic activity in IVIG lots was investigated with substrates S‐2302 and S‐2288. In immunocapture assays, prekallikrein and FXI antigen and respective active proteases were quantified. Non‐activated partial thromboplastin time (NAPTT) and a modified FXIa PTT served as global and FXIa‐specific clotting assays, respectively. Results Kallikrein was identified as one major contaminant activity in IVIGs. A second activity was seen in some IVIGs with substrate S‐2288, but not with S‐2302. Inhibition studies excluded FXIIa, thrombin or plasmin as contaminant activity. FXI antigen was seen in all 19 IVIG lots, and FXIa activity was found as second major impurity in some IVIGs, including all lots involved in TEEs. FXIa highly correlated with a short clotting time in NAPTT. Conclusions Kallikrein and FXIa are the major contaminants in IVIGs. FXIa was highly procoagulant, with highest level in TEE‐associated IVIGs. Since the NAPTT unambiguously identified FXIa procoagulant activity in IVIGs, its implementation as a release test would improve the safety of IVIGs." @default.
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- W1803149178 date "2011-05-05" @default.
- W1803149178 modified "2023-10-16" @default.
- W1803149178 title "Identification of kallikrein and FXIa as impurities in therapeutic immunoglobulins: implications for the safety and control of intravenous blood products" @default.
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- W1803149178 doi "https://doi.org/10.1111/j.1423-0410.2011.01502.x" @default.
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