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2016 ; 11
(6
): e0156125
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Novel Phospholipid-Protein Conjugates Allow Improved Detection of Antibodies in
Patients with Autoimmune Diseases
#MMPMID27257889
Samuelsen SV
; Maity A
; Nybo M
; Macaubas C
; Lønstrup L
; Balboni IM
; Mellins ED
; Astakhova K
PLoS One
2016[]; 11
(6
): e0156125
PMID27257889
show ga
Reliable measurement of clinically relevant autoimmune antibodies toward
phospholipid-protein conjugates is highly desirable in research and clinical
assays. To date, the development in this field has been limited to the use of
natural heterogeneous antigens. However, this approach does not take structural
features of biologically active antigens into account and leads to low
reliability and poor scientific test value. Here we describe novel
phospholipid-protein conjugates for specific detection of human autoimmune
antibodies. Our synthetic approach includes mild oxidation of synthetic
phospholipid cardiolipin, and as the last step, coupling of the product with
azide-containing linker and copper-catalyzed click chemistry with ?2-glycoprotein
I and prothrombin. To prove utility of the product antigens, we used
enzyme-linked immunosorbent assay and three cohorts of samples obtained from
patients in Denmark (n = 34) and the USA (n = 27 and n = 14). Afterwards we
analyzed correlation of the obtained autoantibody titers with clinical parameters
for each patient. Our results prove that using novel antigens clinically relevant
autoantibodies can be detected with high repeatability, sensitivity and
specificity. Unlike previously used antigens the obtained autoantibody titers
strongly correlate with high disease activity and in particular, with arthritis,
renal involvement, anti-Smith antibodies and high lymphocyte count. Importantly,
chemical composition of antigens has a strong influence on the correlation of
detected autoantibodies with disease activity and manifestations. This confirms
the crucial importance of antigens' composition on research and diagnostic
assays, and opens up exciting perspectives for synthetic antigens in future
studies of autoimmunity.