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Benyamine A, Bertin D, Resseguier N, Heim X, Bermudez J, Launay D, Dubucquoi S, Hij A, Farge D, Lescoat A, Bahon-Riedinger I, Benmostefa N, Mouthon L, Harlé JR, Kaplanski G, Rossi P, Bardin N, Granel B. Quantification of Antifibrillarin (anti-U3 RNP) Antibodies: A New Insight for Patients with Systemic Sclerosis. Diagnostics (Basel) 2021; 11:diagnostics11061064. [PMID: 34207757 PMCID: PMC8226926 DOI: 10.3390/diagnostics11061064] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 05/19/2021] [Accepted: 05/26/2021] [Indexed: 12/04/2022] Open
Abstract
Background: The detection of additional autoantibodies is of great concern in systemic sclerosis (SSc) when those included in the ACR/EULAR classification are negative. In this context, the interest of antifibrillarin (anti-U3RNP) autoantibodies (AFAs) in the routine evaluation of SSc remains unclear. We aimed to assess the relevance of AFAs and their clinical association in SSc patients. Methods: In a multicenter observational retrospective study, we collected immunological and clinical data associated with AFA positivity in SSc (n = 42) and non-SSc patients (n = 13). Patients with SSc negative for AFAs (n = 83) were considered as a control group. AFAs were detected by indirect immunofluorescence (IIF) using HEp-2 cells, EliA or immunoblot techniques. Results: We confirmed a typical nuclear IIF pattern and showed that AFAs are mostly exclusive towards SSc conventional autoantibodies. Although also observed in non-SSc patients, high levels of AFAs with the ELiA technique allowed the diagnosis of SSc. Compared to AFA-negative SSc patients, AFA-positive SSc patients more frequently exhibited visceral involvements. They more frequently suffered from the diffuse cutaneous form and had a higher global severity of the disease. Conclusions: We demonstrate the usefulness of quantifying AFAs in the immunological exploration of SSc, especially when patients are seronegative for SSc conventional autoantibodies and display a typical IIF pattern. AFAs might constitute an interesting marker of SSc severity.
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Affiliation(s)
- Audrey Benyamine
- Internal Medicine Department, North Hospital of Marseilles, Public Assistance Hospital of Marseilles (AP-HM), 13015 Marseilles, France; (P.R.); (B.G.)
- Aix Marseilles University (AMU), INSERM, INRA, C2VN, 13005 Marseilles, France; (X.H.); (J.B.); (G.K.); (N.B.)
- Correspondence: ; Tel.: +33-4-91-96-87-11; Fax: +33-4-91-96-80-80
| | - Daniel Bertin
- Immunology Laboratory, La Conception Hospital, Public Assistance Hospital of Marseilles (AP-HM), 13005 Marseilles, France;
| | - Noémie Resseguier
- Epidemiology and Health Economics, La Timone Hospital, AP-HM, Aix Marseilles University (AMU), 13005 Marseilles, France;
| | - Xavier Heim
- Aix Marseilles University (AMU), INSERM, INRA, C2VN, 13005 Marseilles, France; (X.H.); (J.B.); (G.K.); (N.B.)
- Immunology Laboratory, La Conception Hospital, Public Assistance Hospital of Marseilles (AP-HM), 13005 Marseilles, France;
| | - Julien Bermudez
- Aix Marseilles University (AMU), INSERM, INRA, C2VN, 13005 Marseilles, France; (X.H.); (J.B.); (G.K.); (N.B.)
| | - David Launay
- Univ. Lille, U1286-INFINITE—Institute for Translational Research in Inflammation, F-59000 Lille, France;
- Inserm, F-59000 Lille, France
- CHU Lille, Internal Medicine and Clinical Immunology Department, Center of Reference for Rare Autoimmune and Systemic Diseases of North and North-West France (CeRAINO), F-59000 Lille, France
| | - Sylvain Dubucquoi
- Immunology Institute, Hospital University Center of Lille, 59037 Lille, France;
| | - Adrian Hij
- Public Assistance Hospital of Paris, Saint-Louis Hospital, Autoimmune and Vascular Disease Unit, Internal Medicine (UF04), Center of reference for rare systemic autoimmune diseases (FAI2R), Université de Paris, EA 3518, Paris, France; (A.H.); (D.F.)
| | - Dominique Farge
- Public Assistance Hospital of Paris, Saint-Louis Hospital, Autoimmune and Vascular Disease Unit, Internal Medicine (UF04), Center of reference for rare systemic autoimmune diseases (FAI2R), Université de Paris, EA 3518, Paris, France; (A.H.); (D.F.)
- Department of Medicine, McGill University, Montreal, QC H3G 2M1, Canada
| | - Alain Lescoat
- Internal Medicine and Clinical Immunology Department, Hospital University Center of Rennes, 35000 Rennes, France;
| | | | - Nouria Benmostefa
- Internal Medicine Department, Center of reference for rare systemic autoimmune diseases of Ile de France, Cochin Hospital, Public Assistance Hospital of Paris (AP-HP), 75014 Paris, France; (N.B.); (L.M.)
| | - Luc Mouthon
- Internal Medicine Department, Center of reference for rare systemic autoimmune diseases of Ile de France, Cochin Hospital, Public Assistance Hospital of Paris (AP-HP), 75014 Paris, France; (N.B.); (L.M.)
| | - Jean-Robert Harlé
- Internal Medicine Department, La Timone Hospital, Public Assistance Hospital of Marseilles (AP-HM), 13005 Marseilles, France;
| | - Gilles Kaplanski
- Aix Marseilles University (AMU), INSERM, INRA, C2VN, 13005 Marseilles, France; (X.H.); (J.B.); (G.K.); (N.B.)
- Internal Medicine and Clinical Immunology Department, La Conception Hospital, Public Assistance Hospital of Marseilles (AP-HM), 13005 Marseilles, France
| | - Pascal Rossi
- Internal Medicine Department, North Hospital of Marseilles, Public Assistance Hospital of Marseilles (AP-HM), 13015 Marseilles, France; (P.R.); (B.G.)
- Aix Marseilles University (AMU), INSERM, INRA, C2VN, 13005 Marseilles, France; (X.H.); (J.B.); (G.K.); (N.B.)
| | - Nathalie Bardin
- Aix Marseilles University (AMU), INSERM, INRA, C2VN, 13005 Marseilles, France; (X.H.); (J.B.); (G.K.); (N.B.)
- Immunology Laboratory, La Conception Hospital, Public Assistance Hospital of Marseilles (AP-HM), 13005 Marseilles, France;
| | - Brigitte Granel
- Internal Medicine Department, North Hospital of Marseilles, Public Assistance Hospital of Marseilles (AP-HM), 13015 Marseilles, France; (P.R.); (B.G.)
- Aix Marseilles University (AMU), INSERM, INRA, C2VN, 13005 Marseilles, France; (X.H.); (J.B.); (G.K.); (N.B.)
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