Detection of autoantibodies against alpha-2-macroglobulin-like 1 in paraneoplastic pemphigus sera utilizing novel green fluorescent protein-based immunoassays.

Bazzini, Cecilia; Begré, Nadja; Favre, Bertand; Hashimoto, Takashi; Hertl, Michael; Schlapbach, Christoph; Borradori, Luca (2020). Detection of autoantibodies against alpha-2-macroglobulin-like 1 in paraneoplastic pemphigus sera utilizing novel green fluorescent protein-based immunoassays. Journal of dermatological science, 98(3), pp. 173-178. Elsevier 10.1016/j.jdermsci.2020.04.005

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BACKGROUND

Paraneoplastic pemphigus (PNP) is a devastating autoimmune multiorgan syndrome associated with autoantibodies against several autoantigens, including the alpha-2-macroglobulin-like-1 (A2ML1). A2ML1 is recognized by up to 70 % of PNP sera. The currently recommended techniques for serological diagnosis of PNP are inadequate to detect anti-A2ML1 antibodies.

OBJECTIVES

To develop novel assays which allow to easily and reliably detect anti-A2ML1 autoantibodies in PNP sera.

METHODS

We produced full-length A2ML1 in fusion with enhanced green fluorescent protein (EGFP-A2ML1) in transfected human embryonic kidney 293 T cells. The recombinant protein was used as fluorescent ligand for immunoprecipitation studies. We further developed an enzyme-linked immunosorbent assay (ELISA) by immobilizing EGFP-A2ML1 on 96-well plates.

RESULTS

A2ML1-positive PNP sera were able to immunoprecipitate EGFP-A2ML1. Direct measurement of fluorescence in immunoprecipitates correlates with the relative levels of anti-A2ML1 antibodies in the PNP sera. By the novel ELISA, based on the determined best cut-off value, 61 % of the tested 36 PNP sera were A2ML1 positive with a specificity of 88.9 % and a sensitivity of 95 %. The 20 tested normal sera (NHS) were negative, while 2 (10 %) of 20 pemphigus vulgaris and 3 (15 %) of 20 bullous pemphigoid sera showed borderline values.

CONCLUSIONS

Our novel immunoassays enable rapid stratification of PNP patients. The novel green fluorescent protein-based ELISA utilizing an active eukaryotic A2ML1 is highly sensitive and reliable and, hence, is useful for a better understanding of the immunological background of PNP. This approach may be easily applied for the rapid detection of antibodies to various other antigens.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Dermatology, Urology, Rheumatology, Nephrology, Osteoporosis (DURN) > Clinic of Dermatology
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > Forschungsbereich Pathologie > Forschungsgruppe Dermatologie

UniBE Contributor:

Bazzini, Cecilia; Begré, Nadja; Schlapbach, Christoph and Borradori, Luca

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0923-1811

Publisher:

Elsevier

Language:

English

Submitter:

Sandra Nyffenegger

Date Deposited:

10 Dec 2020 18:18

Last Modified:

11 Jan 2021 11:36

Publisher DOI:

10.1016/j.jdermsci.2020.04.005

PubMed ID:

32439251

Uncontrolled Keywords:

Alpha-2-macroglobulin-like 1 Autoimmunity Diagnostic immunoassays Paraneoplastic pemphigus

BORIS DOI:

10.7892/boris.148337

URI:

https://boris.unibe.ch/id/eprint/148337

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