A high-sensitivity electrochemiluminescence-based ELISA for the measurement of the oxidative stress biomarker, 3-nitrotyrosine, in human blood serum and cells.

2.50
Hdl Handle:
http://hdl.handle.net/11287/620664
Title:
A high-sensitivity electrochemiluminescence-based ELISA for the measurement of the oxidative stress biomarker, 3-nitrotyrosine, in human blood serum and cells.
Authors:
Knight, A. R.; Taylor, E. L.; Lukaszewski, R.; Jensen, K. T.; Jones, H. E.; Carré, J. E.; Isupov, M. N.; Littlechild, J. A.; Bailey, S. J.; Brewer, Emily; McDonald, Timothy J. ( 0000-0003-3559-6660 ) ; Pitt, A. R.; Spickett, C. M.; Winyard, P.G.
Abstract:
The generation of 3-nitrotyrosine, within proteins, is a post-translational modification resulting from oxidative or nitrative stress. It has been suggested that this modification could be used as a biomarker for inflammatory diseases. Despite the superiority of mass spectrometry-based determinations of nitrotyrosine, in a high-throughput clinical setting the measurement of nitrotyrosine by an enzyme-linked immunosorbent assay (ELISA) is likely to be more cost-effective. ELISAs offer an alternative means to detect nitrotyrosine, but many commercially available ELISAs are insufficiently sensitive to detect nitrotyrosine in healthy human serum. Here, we report the development, validation and clinical application of a novel electrochemiluminescence-based ELISA for nitrotyrosine which provides superior sensitivity (e.g. a 50-fold increase in sensitivity compared with one of the tested commercial colorimetric ELISAs). This nitrotyrosine ELISA has the following characteristics: a lower limit of quantitation of 0.04 nM nitrated albumin equivalents; intra- and inter-assay coefficients of variation of 6.5% and 11.3%, respectively; a mean recovery of 106 ± 3% and a mean linearity of 0.998 ± 0.001. Far higher nitration levels were measured in normal human blood cell populations when compared to plasma. Mass spectrometry was used to validate the new ELISA method. The analysis of the same set of chemically modified albumin samples using the ELISA method and mass spectrometry showed good agreement for the relative levels of nitration present in each sample. The assay was applied to serum samples from patients undergoing elective surgery which induces the human inflammatory response. Matched samples were collected before and one day after surgery. An increase in nitration was detected following surgery (median (IQR): 0.59 (0.00-1.34) and 0.97 (0.00-1.70) nitrotyrosine (fmol of nitrated albumin equivalents/mg protein) for pre- and post-surgery respectively. The reported assay is suitable for nitrotyrosine determination in patient serum samples, and may also be applicable as a means to determine oxidative stress in primary and cultured cell populations.
Citation:
A high-sensitivity electrochemiluminescence-based ELISA for the measurement of the oxidative stress biomarker, 3-nitrotyrosine, in human blood serum and cells. 2018, 120:246-254 Free Radic. Biol. Med.
Publisher:
Elsevier
Journal:
Free radical biology & medicine
Issue Date:
17-Mar-2018
URI:
http://hdl.handle.net/11287/620664
DOI:
10.1016/j.freeradbiomed.2018.03.026
PubMed ID:
29555590
Additional Links:
https://linkinghub.elsevier.com/retrieve/pii/S0891-5849(18)30129-1
Type:
Journal Article
Language:
en
ISSN:
1873-4596
Appears in Collections:
Exeter Clinical Laboratory International (Blood Sciences, Genetics, Cellular Pathology & Microbiology); 2018 RD&E publications

Full metadata record

DC FieldValue Language
dc.contributor.authorKnight, A. R.en
dc.contributor.authorTaylor, E. L.en
dc.contributor.authorLukaszewski, R.en
dc.contributor.authorJensen, K. T.en
dc.contributor.authorJones, H. E.en
dc.contributor.authorCarré, J. E.en
dc.contributor.authorIsupov, M. N.en
dc.contributor.authorLittlechild, J. A.en
dc.contributor.authorBailey, S. J.en
dc.contributor.authorBrewer, Emilyen
dc.contributor.authorMcDonald, Timothy J.en
dc.contributor.authorPitt, A. R.en
dc.contributor.authorSpickett, C. M.en
dc.contributor.authorWinyard, P.G.en
dc.date.accessioned2018-05-03T13:33:37Z-
dc.date.available2018-05-03T13:33:37Z-
dc.date.issued2018-03-17-
dc.identifier.citationA high-sensitivity electrochemiluminescence-based ELISA for the measurement of the oxidative stress biomarker, 3-nitrotyrosine, in human blood serum and cells. 2018, 120:246-254 Free Radic. Biol. Med.en
dc.identifier.issn1873-4596-
dc.identifier.pmid29555590-
dc.identifier.doi10.1016/j.freeradbiomed.2018.03.026-
dc.identifier.urihttp://hdl.handle.net/11287/620664-
dc.description.abstractThe generation of 3-nitrotyrosine, within proteins, is a post-translational modification resulting from oxidative or nitrative stress. It has been suggested that this modification could be used as a biomarker for inflammatory diseases. Despite the superiority of mass spectrometry-based determinations of nitrotyrosine, in a high-throughput clinical setting the measurement of nitrotyrosine by an enzyme-linked immunosorbent assay (ELISA) is likely to be more cost-effective. ELISAs offer an alternative means to detect nitrotyrosine, but many commercially available ELISAs are insufficiently sensitive to detect nitrotyrosine in healthy human serum. Here, we report the development, validation and clinical application of a novel electrochemiluminescence-based ELISA for nitrotyrosine which provides superior sensitivity (e.g. a 50-fold increase in sensitivity compared with one of the tested commercial colorimetric ELISAs). This nitrotyrosine ELISA has the following characteristics: a lower limit of quantitation of 0.04 nM nitrated albumin equivalents; intra- and inter-assay coefficients of variation of 6.5% and 11.3%, respectively; a mean recovery of 106 ± 3% and a mean linearity of 0.998 ± 0.001. Far higher nitration levels were measured in normal human blood cell populations when compared to plasma. Mass spectrometry was used to validate the new ELISA method. The analysis of the same set of chemically modified albumin samples using the ELISA method and mass spectrometry showed good agreement for the relative levels of nitration present in each sample. The assay was applied to serum samples from patients undergoing elective surgery which induces the human inflammatory response. Matched samples were collected before and one day after surgery. An increase in nitration was detected following surgery (median (IQR): 0.59 (0.00-1.34) and 0.97 (0.00-1.70) nitrotyrosine (fmol of nitrated albumin equivalents/mg protein) for pre- and post-surgery respectively. The reported assay is suitable for nitrotyrosine determination in patient serum samples, and may also be applicable as a means to determine oxidative stress in primary and cultured cell populations.en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0891-5849(18)30129-1en
dc.rightsArchived with thanks to Free radical biology & medicineen
dc.subjectWessex Classification Subject Headings::Clinical pathologyen
dc.titleA high-sensitivity electrochemiluminescence-based ELISA for the measurement of the oxidative stress biomarker, 3-nitrotyrosine, in human blood serum and cells.en
dc.typeJournal Articleen
dc.identifier.journalFree radical biology & medicineen
dc.type.versionIn press (epub ahead of print)en
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