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J Am Soc Nephrol. 2017 Feb;28(2):520-531. doi: 10.1681/ASN.2016010050. Epub 2016 Jul 19.

An Indirect Immunofluorescence Method Facilitates Detection of Thrombospondin Type 1 Domain-Containing 7A-Specific Antibodies in Membranous Nephropathy.

Author information

1
III Medizinische Klinik.
2
Boston University School of Medicine, Boston, Massachusetts; and.
3
Institut für Pathologie, and.
4
Institute of Experimental Immunology, Euroimmun AG, Lubeck, Germany.
5
Nierenregister, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany.
6
III Medizinische Klinik, rstahl@uke.de.

Abstract

Thrombospondin type 1 domain-containing 7A (THSD7A) is a target antigen identified in adult membranous nephropathy (MN) along with the major antigen phospholipase A2 receptor 1 (PLA2R1). The prevalence of THSD7A-Ab-positive patients is unknown, and it is unclear whether the clinical presentation differs between patients positive for PLA2R1-Ab or THSD7A-Ab. We screened serum samples of 1276 patients with MN from three different cohorts for the presence of THSD7A-Ab by Western blot analysis and a newly developed indirect immunofluorescence test (IFT). Compared with Western blot analysis, the IFT had a 92% sensitivity and a 100% specificity. The prevalence of THSD7A-associated MN in a prospective cohort of 345 patients with MN was 2.6%, and most were women. In this cohort, the percentage of patients with THSD7A-associated MN and malignant disease significantly exceeded that of patients with PLA2R1-associated MN and malignant disease. In all cohorts, we identified 40 patients with THSD7A-associated MN, eight of whom developed a malignancy within a median time of 3 months from diagnosis of MN. In one patient with THSD7A-associated MN and metastases of an endometrial carcinoma, immunohistochemistry showed THSD7A expression on the metastatic cells and within follicular dendritic cells of the metastasis-infiltrated lymph node. We conclude that the IFT allows sensitive and specific measurement of circulating THSD7A-Ab in patients with MN. Patients with THSD7A-associated MN differ in their clinical characteristics from patients with PLA2R1-associated MN, and more intensive screening for the presence of malignancies may be warranted in those with THSD7A-associated MN.

KEYWORDS:

THSD7A Antibodies; membranous nephropathy; nephrotic syndrome

PMID:
27436855
PMCID:
PMC5280014
DOI:
10.1681/ASN.2016010050
[Indexed for MEDLINE]
Free PMC Article

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