With variants known as discoid lupus, subacute cutaneous lupus, and systemic lupus erythematosus, lupus is one of several disorders of the immune system considered “autoimmune” in nature. These diseases occur when the immune system malfunctions and turns its infection-defense capabilities against the body, producing antibodies against healthy cells and tissues. These antibodies promote chronic inflammation and can damage organs and tissues. In lupus, these antibodies are known as antinuclear antibodies (ANA) because they target parts of the cell’s nucleus. Experts don’t yet fully understand all of the factors and triggers that cause inflammation and tissue damage in lupus, and research is ongoing.
B cells obtain help from T cells in the antibody response by acting as antigen-specific antigen presenting cells. A direct signal through binding of antigen to membrane Ig can enhance B cell antigen presentation and T-dependent B cell activation, but is not required for a productive interaction between a small resting B cell and a differentiated helper T cell.
The 19th century's research into lupus continued with the work of Sir William Osler who, in 1895, published the first of his three papers about the internal complications of erythema exudativum multiforme. Not all the patient cases in his paper had SLE but Osler's work expanded the knowledge of systemic diseases and documented extensive and critical visceral complications for several diseases including lupus. Noting that many people with lupus had a disease that not only affected the skin but many other organs in the body as well, Osler added the word "systemic" to the term lupus erythematosus to distinguish this type of disease from discoid lupus erythematosus. Osler's second paper noted that reoccurrence is a special feature of the disease and that attacks can be sustained for months or even years. Further study of the disease led to a third paper, published in 1903, documenting afflictions such as arthritis, pneumonia, the inability to form coherent ideas, delirium, and central nervous system damage as all affecting patients diagnosed with SLE.
For instance, a dermatologist for cutaneous lupus (skin disease), a cardiologist for heart disease, a nephrologist for kidney disease, a neurologist for brain and nervous system disease, or a gastroenterologist for gastrointestinal tract disease. A woman with lupus who is considering a pregnancy needs an obstetrician who specializes in high-risk pregnancies.
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