Clinical and Diagnostic Value of Ribosomal p2 Autoantibodies in Systemic Lupus Erythematosus

Study Overview
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Brief Summary
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Systemic lupus erythematosus (SLE) is a chronic autoimmune disorder characterized by production of autoantibodies directed against nuclear and cytoplasmic antigens. Clinically, this disorder is characterized by periods of remission and relapse (1). The early and accurate diagnosis of SLE is challenging (2). The SLE pathogenesis involves multiple cellular components of the innate and immune systems, presence of autoantibodies and immune complexes, engagement of the complement system and cytokine dysregulation (3). About 180 autoantibodies have been identified in SLE patients, 102 of which are reported to have an organ-specific correlation with SLE disease identified in SLE patients, with SLE disease activity (4). However, with the exception of autoantibodies such as antinuclear antibody (ANA), anti double stranded DNA (dsDNA), anti-smith and antiphospholipid antibodies, currently proposed by the American college of rheumatology (ACR) (5)

Detailed Description
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systemic lupus international collaborating clinics (SLICC) (6) for the diagnosis of SLE, most of these autoantibodies lack sufficient sensitivity and/or specificity for use in clinical diagnosis. Discovery of additional autoantibodies with high sensitivity and specificity is important for early diagnosis and assessment of the prognosis of SLE (7). Anti-ribosomal P(Anti-Rib-P) antibody, routinely tested in SLE, targets a homologous 22-amino acid C-terminal (C-22) sequence shared by three ribosomal phosphoproteins known as P0, P1, and P2 (8). The prevalence of anti-Rib-P antibody is about 15-40% in SLE patients and varies with the ethnicity, disease activity and detection method (9). Studies have disclosed that anti-P antibodies react with activated T cells but not with B cells, suggesting possible direct effects of anti-P antibodies on immune regulation (10).

Official Title
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Clinical and Diagnostic Value of Ribosomal p2 Autoantibodies in Systemic Lupus Erythematosus: Case Control Study

Conditions
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Systemic Lupus Erythematosus

Intervention / Treatment
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* Diagnostic Test: Ribosomal p2 Autoantibodies as a Serum marker


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients who fulfilled the 2012 SLICC criteria (6). SLE Patients >= 18 years old. Exclusion Criteria: 1-SLE Patients < 18 years old. 2- Patients with other autoimmune diseases or malignancy.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 75 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| SLE patients group<br>The study will include 50 patients suffering from SLE, all patients with SLE should fulfill 2012 SLICC criteria | Diagnostic Test: Ribosomal p2 Autoantibodies as a Serum marker<br>* Using serum marker<br>|
| Healthy control group<br>Control group of 40 healthy volunteers with age and gender-matched with SLE patients. | Diagnostic Test: Ribosomal p2 Autoantibodies as a Serum marker<br>* Using serum marker<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| a. Primary (main): Assessment of diagnostic value (sensitivity and specificity) of serum ribosomal p2 autoantibody level in SLE patients in comparison to healthy controls | The importance of Ribosomal p2 autoantibodies in diagnosis of SLE | Baseline | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| b. Secondary (subsidiary): correlation between serum ribosomal p2 autoantibody level and SLE clinical, laboratory data, disease activity and severity. | The relation between rib p2 level in serum and determination of disease severity and prognosis | Baseline |