Clinical chemistry · 2009
Heterogeneous nuclear ribonucleoprotein h1, a novel nuclear autoantigen.
СтатьяПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод в очереди
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Van den Bergh Karolien, Hooijkaas Herbert, Blockmans Daniel, Westhovens René, Op De Beéck Katrijn, Verschueren Patrick, Dufour Diana, van de Merwe Joop P, Fijak Monika, Klug Jörg, Michiels Georges, Devogelaere Benoit, De Smedt Humbert, Derua Rita, Waelkens Etienne, Blanckaert Norbert, Bossuyt Xavier
Аннотация
BACKGROUND: Serum samples from patients with autoimmune connective tissue diseases that show a finely speckled antinuclear antibody (ANA) on indirect immune-fluorescence often have antibodies against unknown nuclear target antigens. To search for such autoantigens we applied a proteomic approach using sera from patients with a high ANA titer (>or=640) and finely speckled fluorescence but in whom no antibodies to extractable nuclear antigens (ENA) could be identified.
METHODS: Using an immunoproteomics approach we identified heterogeneous nuclear ribonucleoprotein H1 (hnRNP H1) as a novel nuclear target of autoantibody response.
RESULTS: Recombinant rat hnRNP H1 reacted in Western blot analyses with 48% of 93 sera from patients with primary Sjögren syndrome and with 5.2% of 153 sera from patients with other connective tissue diseases (diseased controls). For comparison, the diagnostic sensitivity and specificity of anti-Sjögren syndrome A (SSA) antibodies for primary Sjögren syndrome in the same patient cohort were 88.2% and 76.3%, respectively. Interestingly, 5 of 11 primary Sjögren syndrome patients with no anti-SSA or anti-SSB antibodies had anti-hnRNP H1 antibodies. Anti-hnRNP H1 antibodies were preabsorbed by hnRNP H1, as demonstrated by indirect immunofluorescence. In an evaluation of the presence of anti-hnRNP H1 antibodies in 188 consecutive samples submitted to the clinical laboratory with positive ANA (titer >or=160), anti-hnRNP H1 antibodies were found in 3 of 7 (2 primary and 5 secondary) Sjögren syndrome patients and in 8.3% of the diseased controls.
CONCLUSIONS: HnRNP H1 is a newly discovered autoantigen that could become an additional diagnostic marker.
METHODS: Using an immunoproteomics approach we identified heterogeneous nuclear ribonucleoprotein H1 (hnRNP H1) as a novel nuclear target of autoantibody response.
RESULTS: Recombinant rat hnRNP H1 reacted in Western blot analyses with 48% of 93 sera from patients with primary Sjögren syndrome and with 5.2% of 153 sera from patients with other connective tissue diseases (diseased controls). For comparison, the diagnostic sensitivity and specificity of anti-Sjögren syndrome A (SSA) antibodies for primary Sjögren syndrome in the same patient cohort were 88.2% and 76.3%, respectively. Interestingly, 5 of 11 primary Sjögren syndrome patients with no anti-SSA or anti-SSB antibodies had anti-hnRNP H1 antibodies. Anti-hnRNP H1 antibodies were preabsorbed by hnRNP H1, as demonstrated by indirect immunofluorescence. In an evaluation of the presence of anti-hnRNP H1 antibodies in 188 consecutive samples submitted to the clinical laboratory with positive ANA (titer >or=160), anti-hnRNP H1 antibodies were found in 3 of 7 (2 primary and 5 secondary) Sjögren syndrome patients and in 8.3% of the diseased controls.
CONCLUSIONS: HnRNP H1 is a newly discovered autoantigen that could become an additional diagnostic marker.
Предметные рубрики MeSH
AdultAgedAged, 80 and overAnimalsAutoantibodiesBlotting, WesternCohort StudiesFemaleFluorescent Antibody Technique, IndirectHeterogeneous-Nuclear Ribonucleoprotein Group F-HHumansMaleMiddle AgedROC CurveRatsRecombinant ProteinsSjogren's SyndromeSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationYoung Adult