{"id":68067,"date":"2026-06-23T03:51:55","date_gmt":"2026-06-23T01:51:55","guid":{"rendered":"https:\/\/inmuno.es\/index.php\/2026\/06\/23\/reconsidering-the-immunological-aspects-of-solid-phase-assays-for-antiphospholipid-antibodies-detection\/"},"modified":"2026-06-23T03:51:55","modified_gmt":"2026-06-23T01:51:55","slug":"reconsidering-the-immunological-aspects-of-solid-phase-assays-for-antiphospholipid-antibodies-detection","status":"publish","type":"post","link":"https:\/\/inmuno.es\/index.php\/2026\/06\/23\/reconsidering-the-immunological-aspects-of-solid-phase-assays-for-antiphospholipid-antibodies-detection\/","title":{"rendered":"Reconsidering the immunological aspects of solid-phase assays for antiphospholipid antibodies detection"},"content":{"rendered":"<div>\n<p><b>Curr Opin Immunol<\/b>. 2026 Jun 22;101:102805. doi: 10.1016\/j.coi.2026.102805. Online ahead of print.<\/p>\n<p><b>ABSTRACT<\/b><\/p>\n<p>Solid\u2011phase assays for the detection of antiphospholipid antibodies (aPL) are central to the laboratory evaluation of antiphospholipid syndrome (APS). Growing insights into the molecular immunology underlying these assays challenge traditional interpretations. It is now evident that the antigenic drivers are phospholipids (PL)\u2011binding proteins &#8211; primarily \u03b22-glycoprotein I (\u03b22GPI) and prothrombin (PT). \u03b22-glycoprotein I\u2011dependent aPL represent the dominant subset, recognizing discontinuous conformational epitopes spanning domains I-II (DI-DII). Solid matrices coated with anionic PL or partially oxidized polystyrene amplify DV anchoring through its lysine\u2011rich cationic loop, thereby increasing local antigen density and molecule orientation, ultimately enhancing functional avidity of intrinsically low\u2011affinity aPL. These antibodies contribute to reactivity across all three APS laboratory criteria assays: lupus anticoagulant (LA), anticardiolipin, and anti\u2011\u03b22GPI. Beyond \u03b22GPI, PT\u2011reactive aPL, detected by phosphatidylserine\/prothrombin (aPS\/PT) ELISAs, bind epitopes unveiled only when PT engages anionic PL in a Ca\u00b2\u207a\u2011dependent conformational transition. Distinct antigenic specificities &#8211; type I (open\u2011conformation fragment\u20111 epitope) and type II (C\u2011terminal Gla domain) &#8211; exhibit divergent affinities, matrix\u2011dependent binding behaviors, and heterogeneous LA activity. Antibodies detected through aPS\/PT assays are associated with APS manifestations and often with LA (range 54.8-82.0%). Conversely, a smaller population of &#8216;pure&#8217; lipid\u2011binding aPL, independent of \u03b22GPI or PT, appears to target lysobisphosphatidic acid (LBPA) within the endothelial protein C receptor\/LBPA complex, activating pro\u2011inflammatory\/pro\u2011coagulant pathways. Although these antibodies may contribute to APS pathogenesis in a minority of patients, their detection remains technically challenging and is currently confined to research settings. Understanding the immunological characteristics of aPL subsets is essential for interpreting solid\u2011phase assays and improving APS management.<\/p>\n<p>PMID:<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/42330677\/?utm_source=SimplePie&amp;utm_medium=rss&amp;utm_content=8900118&amp;ff=20260622215154&amp;v=2.20.0\">42330677<\/a> | DOI:<a href=\"https:\/\/doi.org\/10.1016\/j.coi.2026.102805\">10.1016\/j.coi.2026.102805<\/a><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Curr Opin Immunol. 2026 Jun 22;101:102805. doi: 10.1016\/j.coi.2026.102805. Online ahead of print. ABSTRACT Solid\u2011phase assays for the detection of antiphospholipid antibodies (aPL) are central to the laboratory evaluation of antiphospholipid syndrome (APS). Growing insights into the molecular immunology underlying these assays challenge traditional interpretations. It is now evident that the antigenic drivers are phospholipids (PL)\u2011binding &#8230; <a title=\"Reconsidering the immunological aspects of solid-phase assays for antiphospholipid antibodies detection\" class=\"read-more\" href=\"https:\/\/inmuno.es\/index.php\/2026\/06\/23\/reconsidering-the-immunological-aspects-of-solid-phase-assays-for-antiphospholipid-antibodies-detection\/\" aria-label=\"Read more about Reconsidering the immunological aspects of solid-phase assays for antiphospholipid antibodies detection\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[59,42],"tags":[],"class_list":["post-68067","post","type-post","status-publish","format-standard","hentry","category-current-opinion-in-immunology","category-publicaciones"],"_links":{"self":[{"href":"https:\/\/inmuno.es\/index.php\/wp-json\/wp\/v2\/posts\/68067","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/inmuno.es\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/inmuno.es\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/inmuno.es\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/inmuno.es\/index.php\/wp-json\/wp\/v2\/comments?post=68067"}],"version-history":[{"count":0,"href":"https:\/\/inmuno.es\/index.php\/wp-json\/wp\/v2\/posts\/68067\/revisions"}],"wp:attachment":[{"href":"https:\/\/inmuno.es\/index.php\/wp-json\/wp\/v2\/media?parent=68067"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/inmuno.es\/index.php\/wp-json\/wp\/v2\/categories?post=68067"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/inmuno.es\/index.php\/wp-json\/wp\/v2\/tags?post=68067"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}