The mechanism by which foreign antigens are taken into antigen-presenting cells (APCs) and broken up. Part of the antigen is then displayed (presented) on the surface of the APC next to a histocompatibility or self-antigen, activating T lymphocytes and cell-mediated immunity. T lymphocytes are unable to recognize or respond to most antigens without APC assistance.
If you have lupus you may have noticed that certain foods tend to lead to lupus flares. A lupus flare is a period when the symptoms of lupus become more active. Kathleen LaPlant, of Cape Cod, Mass., was diagnosed with systemic lupus several years ago. "I have learned to be careful with foods that seem to trigger lupus symptoms. The biggest trigger for me has been fried foods. I have had to eliminate these from my diet," says LaPlant. It is hard to predict which foods may trigger a lupus flare, but you can start by paying close attention to your diet. If a particular type of food repeatedly causes problems, try taking it out of your diet and see if it makes a difference.
While there is no cure for lupus, there are treatments that can help prevent flares, treat symptoms and reduce organ damage. Early diagnosis and treatment is the key to successful management of lupus. Treatment depends on the type and severity of the symptoms. Like all medications, these treatments have potential side effects. It is very important that you communicate with your health care professional about the potential benefits and potential side effects of any treatment.
The immune system must balance between being sensitive enough to protect against infection, and become sensitized to attack the body's own proteins (autoimmunity). During an immune reaction to a foreign stimulus, such as bacteria, virus, or allergen, immune cells that would normally be deactivated due to their affinity for self-tissues can be abnormally activated by signaling sequences of antigen-presenting cells. Thus triggers may include viruses, bacteria, allergens (IgE and other hypersensitivity), and can be aggravated by environmental stimulants such as ultraviolet light and certain drug reactions. These stimuli begin a reaction that leads to destruction of other cells in the body and exposure of their DNA, histones, and other proteins, particularly parts of the cell nucleus. The body's sensitized B-lymphocyte cells will now produce antibodies against these nuclear-related proteins. These antibodies clump into antibody-protein complexes which stick to surfaces and damage blood vessels in critical areas of the body, such as the glomeruli of the kidney; these antibody attacks are the cause of SLE. Researchers are now identifying the individual genes, the proteins they produce, and their role in the immune system. Each protein is a link on the autoimmune chain, and researchers are trying to find drugs to break each of those links.
A member of a group of enzymes that can break down proteins, such as collagen, that are normally found in the spaces between cells in tissues (i.e., extracellular matrix proteins). Because these enzymes need zinc or calcium atoms to work properly, they are called metalloproteinases. Matrix metalloproteinases are involved in wound healing, angiogenesis, and tumor cell metastasis.
Inflammation of the kidneys caused by an autoimmune disease called systemic lupus erythematosus. The condition can cause hematuria and proteinuria, and it may progress to end-stage renal disease. The most severe form of lupus nephritis, called diffuse proliferative nephritis, can cause scars to form in the kidneys. Scars are permanent, and kidney function often declines as more scars form. Early diagnosis and treatment may help prevent long-lasting damage.
Nonsteroidal anti-inflammatory drugs (NSAIDs) are helpful in reducing inflammation and pain in muscles, joints, and other tissues. Examples of NSAIDs include aspirin, ibuprofen (Motrin), naproxen (Naprosyn), and sulindac (Clinoril). Since the individual response to NSAIDs varies, it is common for a doctor to try different NSAIDs to find the most effective one with the fewest side effects. The most common side effects are stomach upset, abdominal pain, ulcers, and even ulcer bleeding. NSAIDs are usually taken with food to reduce side effects. Sometimes, medications that prevent ulcers while taking NSAIDs, such as misoprostol (Cytotec), are given simultaneously.
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Most patients with systemic lupus erythematosus (unless they’re otherwise advised by their rheumatologist) should be taking an oral antimalarial drug — medications originally used to prevent a malaria infection, but that have been found to help with lupus symptoms, says Dr. Kramer. The antimalarial hydroxychloroquine helps prevent lupus flares, minimizes joint inflammation, and controls fever, fatigue, pleurisy (inflammation of the sac surrounding the lungs), and pericarditis (inflammation of the lining around the heart). The drug is also “the backbone of therapy” for most skin rashes associated with lupus, says Kramer. Mouth sores may also be alleviated with this drug. Chloroquine and quinacrine are other antimalarials drugs used to treat lupus. (3)
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