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De Spiegeleer, Bart; Vergote, Valentijn; Pezeshki, Adel; Peremans, Kathelijne; Burvenich, Christian
Analytical biochemistry, 05/2008, Letnik: 376, Številka: 2Journal Article
Following several conflicting publications, the inability to reproduce the original findings on in vitro obestatin binding and activation of GPR39 receptors was recently reported by its discoverers, and several hypotheses to rationalize these findings were proposed. Based on one of these postulations ( i.e., presence of impurities), peptide identity and impurity profiles were thoroughly evaluated on obestatin peptides obtained from five different manufacturers, as used by the different research groups. We found that one of the products examined was in reality a totally different peptide and that the quality of two-thirds of the other peptides was insufficient for in vitro and in vivo experiments ( i.e., peptide purity less than 95% and/or individual impurities exceeding 1%). These observations question the divergent conclusions reported in the literature about the activity of obestatin. Therefore, we strongly recommend appropriate quality control testing before using any peptides for biomedical research purposes.
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