{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,24]],"date-time":"2026-10-24T00:49:07Z","timestamp":1792802947436,"version":"4.5.0"},"reference-count":57,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"7","funder":[{"name":"National Kidney Foundation of Utah & Idaho","award":["51006060"],"award-info":[{"award-number":["51006060"]}],"id":[{"id":"https:\/\/ror.org\/01n45xa04","id-type":"ROR","asserted-by":"crossref"}]},{"DOI":"10.13039\/100007504","name":"Boston Medical Center","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100007504","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["lww.com","ovid.com"],"crossmark-restriction":true},"short-container-title":["JASN"],"published-print":{"date-parts":[[2021,7]]},"abstract":"<jats:sec>\n                    <jats:title>Significance Statement<\/jats:title>\n                    <jats:p>Membranous nephropathy (MN) is a glomerular disease that often leads to nephrotic syndrome and is caused by autoantibodies that target podocyte proteins. Recent work has identified new targets in this disease, although many cases remain untyped, making clinical monitoring difficult. A combination of conventional and more novel techniques reveals a new target podocyte antigen in MN, serine protease HTRA1. Fourteen patients were identified in a demographic group with mean age of 67.3 years. The titer of circulating anti-HTRA1 antibodies appears to correlate with the disease course, suggesting serial monitoring could facilitate diagnostic and therapeutic decisions. Study of the function of HTRA1 may provide important clues to podocyte biology and the underlying pathogenesis of this type of MN.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Identification of target antigens PLA2R, THSD7A, NELL1, or Semaphorin-3B can explain the majority of cases of primary membranous nephropathy (MN). However, target antigens remain unidentified in 15%\u201320% of patients.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>A multipronged approach, using traditional and modern technologies, converged on a novel target antigen, and capitalized on the temporal variation in autoantibody titer for biomarker discovery. Immunoblotting of human glomerular proteins followed by differential immunoprecipitation and mass spectrometric analysis was complemented by laser-capture microdissection followed by mass spectrometry, elution of immune complexes from renal biopsy specimen tissue, and autoimmune profiling on a protein fragment microarray.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>These approaches identified serine protease HTRA1 as a novel podocyte antigen in a subset of patients with primary MN. Sera from two patients reacted by immunoblotting with a 51-kD protein within glomerular extract and with recombinant human HTRA1, under reducing and nonreducing conditions. Longitudinal serum samples from these patients seemed to correlate with clinical disease activity. As in PLA2R- and THSD7A- associated MN, anti-HTRA1 antibodies were predominantly IgG4, suggesting a primary etiology. Analysis of sera collected during active disease versus remission on protein fragment microarrays detected significantly higher titers of anti-HTRA1 antibody in active disease. HTRA1 was specifically detected within immune deposits of HTRA1-associated MN in 14 patients identified among three cohorts. Screening of 118 \u201cquadruple-negative\u201d (PLA2R-, THSD7A-, NELL1-, EXT2-negative) patients in a large repository of MN biopsy specimens revealed a prevalence of 4.2%.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Conventional and more modern techniques converged to identify serine protease HTRA1 as a target antigen in MN.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1681\/asn.2020101395","type":"journal-article","created":{"date-parts":[[2021,5,5]],"date-time":"2021-05-05T15:55:45Z","timestamp":1620230145000},"page":"1666-1681","update-policy":"https:\/\/doi.org\/10.1097\/lww.0000000000001000","source":"Crossref","is-referenced-by-count":106,"title":["Serine Protease HTRA1 as a Novel Target Antigen in Primary Membranous Nephropathy"],"prefix":"10.1681","volume":"32","author":[{"given":"Laith Farah","family":"Al-Rabadi","sequence":"first","affiliation":[{"name":"Division of Nephrology and Hypertension, Department of Internal Medicine, University of Utah Health, Salt Lake City, Utah"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tiffany","family":"Caza","sequence":"additional","affiliation":[{"name":"Arkana Laboratories, Little Rock, Arkansas"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claire","family":"Trivin-Avillach","sequence":"additional","affiliation":[{"name":"Section of Nephrology, Department of Medicine, Boston Medical Center and Boston University School of Medicine, Boston, Massachusetts"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9202-2378","authenticated-orcid":false,"given":"Aylin R.","family":"Rodan","sequence":"additional","affiliation":[{"name":"Division of Nephrology and Hypertension, Department of Internal Medicine, University of Utah Health, Salt Lake City, 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Internal Medicine Department, University of Arkansas for Medical Science, Little Rock, Arkansas"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aaron","family":"Storey","sequence":"additional","affiliation":[{"name":"Nephrology Division, Internal Medicine Department, University of Arkansas for Medical Science, Little Rock, Arkansas"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rick","family":"Edmondson","sequence":"additional","affiliation":[{"name":"Nephrology Division, Internal Medicine Department, University of Arkansas for Medical Science, Little Rock, Arkansas"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ronald","family":"Sjoberg","sequence":"additional","affiliation":[{"name":"Division of Affinity Proteomics, Department of Protein Science, KTH Royal Institute of Technology, SciLifeLab, Stockholm, 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