Systemic Lupus Erythematosus (SLE)
- Author: Christie M Bartels, MD, MS; Chief Editor: Herbert S Diamond, MD more...
Background
Systemic lupus erythematosus (SLE) is a chronic inflammatory disease that has protean manifestations and follows a relapsing and remitting course. It is characterized by an autoantibody response to nuclear and cytoplasmic antigens. SLE can affect any organ system, but mainly involves the skin, joints, kidneys, blood cells, and nervous system (see Clinica l).
The diagnosis of SLE must be based on the proper constellation of clinical findings and laboratory evidence. American College of Rheumatology (ACR) criteria summarize features necessary for diagnosis. (See Workup.) Management depends on disease severity and organ involvement. Periodic follow-up and laboratory testing are imperative to detect signs and symptoms of new organ-system involvement and to monitor the response or adverse reactions to therapies. (See Treatment.)
Pathophysiology
SLE is an autoimmune disorder characterized by multisystem microvascular inflammation with the generation of autoantibodies. Although the specific cause of SLE is unknown, multiple factors are associated with the development of the disease, including genetic, racial, hormonal, and environmental factors.[1, 2, 3] Many immune disturbances, both innate and acquired, occur in SLE (see the image below).
In systemic lupus erythematosus (SLE), many genetic-susceptibility factors, environmental triggers, antigen-antibody responses, B-cell and T-cell interactions, and immune clearance processes interact to generate and perpetuate autoimmunity. One longstanding proposed mechanism for the development of autoantibodies involves a defect in apoptosis that causes increased cell death and a disturbance in immune tolerance.[4, 5, 2, 6] The redistribution of cellular antigens during necrosis/apoptosis leads to a cell-surface display of plasma and nuclear antigens in the form of nucleosomes. Subsequently, dysregulated (intolerant) lymphocytes begin targeting normally protected intracellular antigens. Recent genetic studies point to disruptions in lymphocyte signalling, interferon response, clearance of complement and immune complexes, apoptosis, and DNA methylation.[7]
Many clinical manifestations of SLE are mediated via circulating immune complexes in various tissues or the direct effects of antibodies to cell surface components. Immune complexes form in the microvasculature, leading to complement activation and inflammation. Moreover, antibody-antigen complexes deposit on the basement membranes of skin and kidneys. In active SLE, this process has been confirmed by demonstration of complexes of nuclear antigens such as DNA, immunoglobulins, and complement proteins at these sites.
Serum antinuclear antibodies (ANAs) are found in nearly all individuals with active SLE. Antibodies to native double-stranded DNA (dsDNA) are relatively specific for the diagnosis of SLE. Whether polyclonal B-cell activation or a response to specific antigens exists is unclear, but much of the pathology involves B cells, T cells, and dendritic cells. Cytotoxic T cells and suppressor T cells (which would normally down-regulate immune responses) are decreased. The generation of polyclonal T-cell cytolytic activity is impaired. Helper (CD4+) T cells are increased. A lack of immune tolerance is observed in animal lupus models. Recent reports pointing to important roles of interferon alpha, transcription factors, and signaling variations also point to a central role for neutrophils.[8]
Etiology
Although the specific cause of SLE is unknown, multiple genetic predispositions and gene-environment interactions have been identified (see chart below). This complex situation perhaps explains the variable clinical manifestations in persons with SLE.
In systemic lupus erythematosus (SLE), many genetic-susceptibility factors, environmental triggers, antigen-antibody responses, B-cell and T-cell interactions, and immune clearance processes interact to generate and perpetuate autoimmunity. Some studies have synthesized what is known about the mechanisms of SLE disease and genetic associations.[2, 7, 9] At least 35 genes are known to increase the risk of SLE.[7] A genetic predisposition is supported by the 40% concordance among monozygotic twins. If a mother has SLE, her daughter's risk of developing the disease has been estimated at 1:40 and her son's risk is 1:250.
Studies of human leukocyte antigens (HLA) reveal that HLA-A1, B8, and DR3 are more common in persons with SLE than in the general population. The presence of the null complement alleles and congenital deficiencies of complement (especially C4, C2, and other early components) are also associated with an increased risk of SLE.
Numerous studies have investigated the role of infectious etiologies that may also perpetuate autoimmunity.[10] Patients with SLE have higher titers of antibodies to Epstein-Barr virus (EBV), have increased circulating EBV viral loads, and make antibodies to retroviruses, including to protein regions homologous to nuclear antigens. Viruses may stimulate specific cells in the immune network. Chronic infections may induce anti-DNA antibodies or even lupuslike symptoms, and acute lupus flares often follow bacterial infections.
Environmental and exposure-related causes of SLE are less clear. Silica dust and cigarette smoking may increase the risk of developing SLE. Administration of estrogen to postmenopausal women appears to increase the risk of developing SLE. Breastfeeding is associated with a decreased risk of developing SLE. Photosensitivity is clearly a precipitant of skin disease.
The results of one study suggest that low vitamin D levels increase autoantibody production in healthy individuals; vitamin D deficiency was also linked to B-cell hyperactivity and interferon-alpha activity in patients with SLE.[11]
Epidemiology
United States statistics
In the United States, the annual incidence of SLE averages 5.1 per 100,000 population. The reported prevalence is 52 cases per 100,000 population.[12] According to a 2008 report from the National Arthritis Data Working Group, approximately 250,000 Americans have SLE.[13] The frequency of SLE could be increasing due to milder forms of the disease that are now being recognized.
The frequency of SLE varies by race and ethnicity, with higher rates reported among black and Hispanic people. The prevalence of SLE is approximately 40 per 100,000 whites in Rochester, Minnesota, versus 100 per 100,000 Hispanic persons in Nogales, Arizona.[14, 15] The incidence of SLE in black women is approximately 4 times higher than in white women. SLE is also more frequent in Asian women than in white women.[14]
International statistics
Worldwide, the prevalence of SLE varies. The highest prevalences have been reported in Italy, Spain, Martinique, and the United Kingdom Afro-Caribbean population.[12] Although the prevalence of SLE is high in black persons in the United Kingdom, the disease is rarely reported among blacks who live in Africa, suggesting that there may be an environmental trigger as well as a genetic basis for their disease.[16]
Race-, sex-, and age-related demographics
Worldwide, the prevalence of SLE appears to vary by race. However, different prevalence rates occur among people of the same race in different geographical locations. The contrast between low reported rates of SLE in Africa and high rates among black women in the United Kingdom suggests the importance of environmental influences.[16] In general, black women have a higher rate of SLE than any other race, followed by Asians, then white women.[12] In the United States, black women are 4 times more likely to have SLE than white women.[12]
SLE frequently starts in women of childbearing age, and the use of exogenous hormones has been associated with lupus onset and flares, suggesting a role for hormonal factors in the pathogenesis of the disease.[17] The risk of SLE development in men is similar to that in prepubertal or postmenopausal women. Interestingly, SLE is more common in men with Klinefelter syndrome (ie, genotype XXY) than in men without the syndrome, also supporting a hormonal hypothesis.
The female-to-male ratio peaks at 11:1 during the childbearing years.[18] A correlation between age and incidence of SLE mirrors peak years of female sex hormone production. Onset of SLE is usually after puberty, typically in the 20s and 30s, with 20% of all cases diagnosed during the first 2 decades of life.[19] The prevalence of SLE is highest among women aged 14-64 years. SLE does not have an age predilection in males, although it should be noted that among older adults, the female-to-male ratio falls.[20]
Prognosis
SLE carries a highly variable prognosis for individual patients. The natural history of SLE ranges from relatively benign disease to rapidly progressive and even fatal disease. SLE often waxes and wanes in affected individuals throughout life, and features of the disease vary greatly between individuals. The disease course is milder and survival rate higher among persons with isolated skin and musculoskeletal involvement than in those with renal[21] and CNS disease.[22] A recent consortium report of 298 SLE patients followed for 5.5 years noted falls in SLE Disease Activity Index 2000 (SLEDAI-2K) scores after the first year of clinical follow up and gradual increases in cumulative mean Systemic Lupus International Collaborating Clinics (SLICC) damage index scores.[23]
Mortality in patients with SLE has decreased over the past 20 years.[24] Prior to 1955, the 5-year survival rate in SLE was less than 50%; currently, the average 10-year survival rate exceeds 90%,[25, 22] and the 15-year survival rate is approximately 80%.[26] Ten-year survival rates in other countries within Asia and Africa are significantly lower, ranging from 60-70%,[27, 28] but may reflect detection bias of severe cases only.
Decreased mortality rates associated with SLE can be attributed to earlier diagnosis (including milder cases), improvement in disease-specific treatments, and advances in general medical care. Yet, according to the Centers for Disease Control and Prevention, however, one third of SLE-related deaths in the United States occur in patients younger than 45 years, making this a serious issue despite declining overall mortality rates.[29]
In 1976, Urowitz first reported bimodal mortality in early versus late SLE, noting that SLE-related deaths usually occur within the first 5-10 years of symptom onset.[30] Mortality in the first few years of illness is typically from severe SLE disease (eg, CNS, renal, or cardiovascular involvement) or infection related to immunosuppressive treatment. Infections account for 29% of all deaths in these patients.[31]
Late deaths (after age 35 years) are generally from myocardial infarction or stroke secondary to accelerated atherosclerosis.[24, 32, 25, 33] Manzi et al reported that women aged 35-44 years with SLE were 50 times more likely to develop myocardial ischemia than healthy Framingham control women.[32] The presence of lupus nephritis may increase these risks.[34]
Causes of accelerated coronary artery disease in persons with SLE are likely multifactorial. They include endothelial dysfunction, inflammatory mediators, corticosteroid-induced atherogenesis, and dyslipidemia.
The influence of race on prognosis has been widely debated. The LUMINA study group examined SLE among black, white, and Hispanic patients in the United States (including Puerto Rico) and reported that both disease activity and poverty predicted higher mortality among racial and ethnic minorities.[35]
Patient Education
Stress the importance of adherence with medications and follow-up appointments for detection and control of SLE disease. Instruct patients with SLE to seek medical care for evaluation of new symptoms, including fever. Advise them regarding their hightened risks for infection and cardiovascular disease. Educate patients with SLE regarding aggressive lipid and blood pressure goals to minimize the risk of coronary artery disease.
Instruct patients with SLE to avoid exposure to sunlight and ultraviolet light. Encourage them to receive nonlive vaccines during stable periods of disease, to quit smoking, and to carefully plan pregnancies.
For patient education information, see the Arthritis Center, as well as Lupus (Systemic Lupus Erythematosus.
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| Definite Association | |
| Chlorpromazine | Methyldopa |
| Hydralazine | Procainamide |
| Isoniazid | Quinidine |
| Possible Association | |
| Beta-blockers | Methimazole |
| Captopril | Nitrofurantoin |
| Carbamazepine | Penicillamine |
| Cimetidine | Phenytoin |
| Ethosuximide | Propylthiouracil |
| Hydrazines | Sulfasalazine |
| Levodopa | Sulfonamides |
| Lithium | Trimethadione |
| Unlikely Association | |
| Allopurinol | Penicillin |
| Chlorthalidone | Phenylbutazone |
| Gold salts | Reserpine |
| Griseofulvin | Streptomycin |
| Methysergide | Tetracyclines |
| Oral contraceptives | |
| *Data from Tierney et al.[51] | |
| Criterion | Definition |
| 1. Malar rash | Fixed erythema, flat or raised, over the malar eminences, tending to spare the nasolabial folds |
| 2. Discoid rash | Erythematous raised patches with adherent keratotic scaling and follicular plugging (Atrophic scarring may occur in older lesions) |
| 3. Photosensitivity | Skin rash as a result of unusual reaction to sunlight, by patient history or physician observation |
| 4. Oral ulcers | Oral or nasopharyngeal ulceration, usually painless, observed by a physician |
| 5. Arthritis | Nonerosive arthritis involving ≥2 peripheral joints, characterized by tenderness, swelling, or effusion |
| 6. Serositis | (A) Pleuritis: Convincing history of pleuritic pain or rub heard by a physician or evidence of pleural effusion or |
| (B) Pericarditis: Documented by ECG or rub or evidence of pericardial effusion | |
| 7. Renal disorder | (A) Persistent proteinuria >0.5 g/d or >3+ if quantitation not performed or |
| (B) Cellular casts: May be red blood cell, hemoglobin, granular, tubular, or mixed | |
| 8. Neurologic disorder | (A) Seizures: In the absence of offending drugs or known metabolic derangements (eg, uremia, ketoacidosis, electrolyte imbalance) or |
| (B) Psychosis: In the absence of offending drugs or known metabolic derangements (eg, uremia, ketoacidosis, electrolyte imbalance) | |
| 9. Hematologic disorder | (A) Hemolytic anemia: With reticulocytosis or |
| (B) Leukopenia: < 4000/mm3 total on ≥2 occasions or | |
| (C) Lymphopenia: < 1500/mm3 on ≥2 occasions or | |
| (D) Thrombocytopenia: < 100,000/mm3 in the absence of offending drugs | |
| 10. Immunologic disorder | (A) Anti-DNA: Antibody to native DNA in abnormal titer or |
| (B) Anti-Sm: Presence of antibody to Sm nuclear antigen or | |
| (C) Positive finding of antiphospholipid antibodies based on (1) an abnormal serum level of IgG or IgM anticardiolipin antibodies, (2) a positive test result for lupus anticoagulant using a standard method, or (3) a false-positive serologic test for syphilis known to be positive for at least 6 months and confirmed by Treponema pallidum immobilization or fluorescent treponemal antibody absorption tests | |
| 11. Antinuclear antibody | An abnormal titer of antinuclear antibody by immunofluorescence or an equivalent assay at any point in time and in the absence of drugs known to be associated with drug-induced lupus syndrome |
| SLE can be diagnosed if any 4 or more of the 11 criteria are present, serially or simultaneously, during any interval of observation. |
| Class | Classification | Features |
| Class I | Minimal mesangial | Normal light microscopy findings; abnormal electron microscopy findings |
| Class II | Mesangial proliferative | Hypercellular on light microscopy |
| Class III | Focal proliferative | < 50% of glomeruli involved |
| Class IV | Diffuse proliferative | >50% of glomeruli involved; classified segmental or global; treated aggressively |
| Class V | Membranous | Predominantly nephrotic disease |
| Class VI | Advanced sclerosing | Chronic lesions and sclerosis |

