Monoclonal anti-neutrophil elastase antibody characterisation: ability to block function, detect free versus serpin-complexed enzyme and stain intracellular granules

Davies, Philip Lloyd, Maxwell, Nicola C., Kotecha, Sailesh ORCID: https://orcid.org/0000-0003-3535-7627 and Spiller, Owen Bradley ORCID: https://orcid.org/0000-0002-9117-6911 2008. Monoclonal anti-neutrophil elastase antibody characterisation: ability to block function, detect free versus serpin-complexed enzyme and stain intracellular granules. Journal of Immunological Methods 336 (2) , pp. 175-182. 10.1016/j.jim.2008.04.010

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Abstract

Four commercially available monoclonal antibodies (clones NP57, 256-3K1, 39A and 203) were characterised for their ability to block human neutrophil elastase (HNE) activity; capture free purified HNE or neutralised HNE in complex with alpha-1-antitrypsin (AAT); detect HNE and HNE–AAT by Western blot analysis; and detect intracellular HNE by flow cytometry. The ability to block small substrate cleavage by HNE ranged from 0% (265-3K1) to 15–18% (39A and 203) to 100% (NP57). All antibodies had the ability to capture free HNE with varying degrees of sensitivity, but HNE neutralisation by AAT resulted in complete loss of detection (NP57) to 2–4-fold decreased detection (39A and 203) to a 8-fold increase in detection (265-3K1). None of the monoclonal antibodies could detect 200 ng of free HNE, or HNE in complex with AAT, by Western blot analysis, which was easily detected by polyclonal antibodies. NP57 and 265-3K1 gave 10-fold higher fluorescence when detecting intracellular HNE than 39A and 203, and intracellular fluorescence decreased by 10–28% following maximal stimulation of purified neutrophils with fMLP and cytochalasin B (compared to 40% release determined by functional assay). However, for sub-maximal stimulation of neutrophils intracellular anti-HNE antibody binding increased, likely due to increased accessibility following redistribution of enzyme, indicating that measuring residual intracellular HNE as an index of release is a less reliable method than directly measuring extracellular HNE.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Medicine
Subjects:	R Medicine > R Medicine (General)
Uncontrolled Keywords:	human neutrophil elastase, alpha-1-antitrypsin, SERPINA1, monoclonal antibodies
Publisher:	Elsevier
ISSN:	0022-1759
Last Modified:	06 Nov 2022 13:04
URI:	https://orca.cardiff.ac.uk/id/eprint/26006

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