Abstract
The soluble epoxide hydrolase (sEH) is a potential pharmacological target for treating hypertension, vascular inflammation, pain, cancer, and other diseases. However, there is not a simple, inexpensive, and reliable method to estimate levels of active sEH in tissues. Toward developing such an assay, a polyclonal variable domain of heavy chain antibody (VHH) sandwich immunoassay was developed. Ten VHHs, which are highly selective for native human sEH, were isolated from a phage-displayed library. The ten VHHs have no significant cross-reactivity with human microsomal epoxide hydrolase, rat and mouse sEH, and denatured human sEH. There is a high correlation between protein levels of the sEH determined by the enzyme-linked immunosorbent assay (ELISA) and the catalytic activity of the enzyme in S9 fractions of human tissues (liver, kidney, and lung). The VHH-based ELISA appears to be a new reliable method for monitoring the sEH and may be useful as a diagnostic tool for diseases influenced by sEH. This study also demonstrates the broad utility of VHH in biochemical and pharmacological research.
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Acknowledgments
This work was supported by the National Institute of Environmental Health Sciences (NIEHS) Superfund Research Program grant P42 ES04699, NIEHS R01 ES02710, FCE 6812 ANII (Agencia Nacional de Investigación e Innovación, Uruguay) and TW05718 Fogarty Center NHI. MR is a recipient of scholarships from ANII and CSIC, Uruguay.
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Cui, Y., Li, D., Morisseau, C. et al. Heavy chain single-domain antibodies to detect native human soluble epoxide hydrolase. Anal Bioanal Chem 407, 7275–7283 (2015). https://doi.org/10.1007/s00216-015-8889-6
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DOI: https://doi.org/10.1007/s00216-015-8889-6