As with all autoimmune conditions, lupus is a disease of the immune system. Your immune system has a very sophisticated mechanism for keeping you safe that it uses to identify the foreign substances that you come into contact with every day, such as allergens, toxins, infections, and even food. If your immune system deems anything dangerous, it will produce antibodies to ward off the harmful intruders.
An increase in the size of an organ, structure, or the body due to growth rather than tumor formation. This term is generally restricted to an increase in size or bulk that results not from an increase in the number of cells but from an increase in a cellular component, e.g., proteins. It applies to any increase in size as a result of functional activity.
Gene regulation is the process of turning genes on and off. During early development, cells begin to take on specific functions. Gene regulation ensures that the appropriate genes are expressed at the proper times. Gene regulation can also help an organism respond to its environment. Gene regulation is accomplished by a variety of mechanisms including chemically modifying genes and using regulatory proteins to turn genes on or off.
A. A healthy, young patient of mine once asked me what the chances were that she might one day develop a "terrible disease." When I asked her what she meant by "terrible disease," she surprised me: she didn't say a disease that could be fatal, but rather a disease that could attack every part of her body. By that definition, systemic lupus erythematosus (lupus for short) is, indeed, a terrible disease.
Erythrocyte Sedimentation Rate: This is a blood test that is used to determine the rate at which red blood cells settle to the bottom of a tube in one hour’s time. If the rate is faster than normal, it may be an indication of a systemic disease, like lupus. It is important to note that this sedimentation rate, or rate of settling, does not specifically indicate lupus, but can be elevated if other inflammatory conditions are present like cancer or an infection.
Synovitis is an inflammation of the joint lining, called synovium. The symptoms are often of short duration and may change location although when caused by overuse tend to remain in one joint. The pain is usually more severe than expected based on the appearance of the joint on examination. In fact, sometimes there is pain without swelling or even tenderness in the joint, in which case the symptom is called “arthralgias” (literally meaning “joint pain” in Greek). Although synovitis has many different causes, the most common cause in an active healthy person is overuse.
Heart: If inflammation affects the heart, it can result in myocarditis and endocarditis. It can also affect the membrane that surrounds the heart, causing pericarditis. Chest pain or other symptoms may result. Endocarditis can damage the heart valves, causing the valve surface to thicken and develop. This can result in growths that can lead to heart murmurs.
Angiogenesis is the growth of blood vessels from the existing vasculature. It occurs throughout life in both health and disease, beginning in utero and continuing on through old age. No metabolically active tissue in the body is more than a few hundred micrometers from a blood capillary, which is formed by the process of angiogenesis. Capillaries are needed in all tissues for diffusion exchange of nutrients and metabolites. Changes in metabolic activity lead to proportional changes in angiogenesis and, hence, proportional changes in capillarity. Oxygen plays a pivotal role in this regulation. Hemodynamic factors are critical for survival of vascular networks and for structural adaptations of vessel walls.
The Accelerating Medicines Partnership (AMP) is a bold new venture between the NIH, 10 biopharmaceutical companies and several non-profit organizations to transform the current model for developing new diagnostics and treatments by jointly identifying and validating promising biological targets of disease. The ultimate goal is to increase the number of new diagnostics and therapies for patients and reduce the time and cost of developing them.
In its simplest definition, the CBC is used to measure red and white blood cell count, the total amount of hemoglobin in the blood, hematocrit (the amount of blood composed of red blood cells), and mean corpuscular volume (the size of red blood cells). The CBC can also count additional blood cell types like neutrophils, eosinophils, basophils, lymphocytes, monocytes, and platelets.
Kidney involvement in people with lupus is potentially life threatening and may occur in up to half of lupus patients. Kidney problems may become apparent when lupus patients feel ill with arthritis, have a rash, fever and weight loss. Less often, kidney disease may occur when there are no other symptoms of lupus. Kidney disease itself usually does not produce symptoms until it is in the advanced stages. It is important that kidney disease be diagnosed early and treated appropriately. The earliest signs of kidney disease are apparent from a urinalysis.
Corticosteroids are more potent than NSAIDs in reducing inflammation and restoring function when the disease is active. Corticosteroids are particularly helpful when internal organs are affected. Corticosteroids can be given by mouth, injected directly into the joints and other tissues, or administered intravenously. Unfortunately, corticosteroids have serious side effects when given in high doses over prolonged periods, and the doctor will try to monitor the activity of the disease in order to use the lowest doses that are safe. Side effects of corticosteroids include weight gain, thinning of the bones and skin, infection, diabetes, facial puffiness, cataracts, and death (necrosis) of the tissues in large joints.
The erythrocyte sedimentation rate (ESR) test is a blood test that measures inflammation in your body and is used to help diagnose conditions associated with acute and chronic inflammation, including lupus. It is usually used in conjunction with other tests, as the test itself is nonspecific. In other words, it can detect increases in inflammation, but it doesn't pinpoint where the inflammation is or point to a specific disease. Other conditions can affect outcomes of the test as well. The test is one that is usually conducted several times over a certain period to measure changes in inflammation.
Research has demonstrated evidence that a key enzyme's failure to dispose of dying cells may contribute the development of systemic lupus erythematosus. The enzyme, DNase1, normally eliminates what is called "garbage DNA" and other cellular debris by chopping them into tiny fragments for easier disposal. Researchers turned off the DNase1 gene in mice. The mice appeared healthy at birth, but after six to eight months, the majority of mice without DNase1 showed signs of systemic lupus erythematosus. Thus, a genetic mutation in a gene that could disrupt the body's cellular waste disposal may be involved in the initiation of systemic lupus erythematosus.
Blood clots are seen with increased frequency in lupus. Clots often occur in the legs (a vein clot, called deep venous thrombosis), lungs (a lung clot, called pulmonary embolus), or brain (stroke). Blood clots that develop in lupus patients may be associated with the production of antiphospholipid antibodies. These antibodies are abnormal proteins that may increase the tendency of the blood to clot.
Only one population-based screening study13 of systemic lupus erythematosus was identified. This study reported a prevalence of 200 cases per 100,000 women (18 to 65 years of age) in England. One review14 estimated the overall U.S. prevalence of definite systemic lupus erythematosus plus incomplete systemic lupus erythematosus (disease meeting only some diagnostic requirements for systemic lupus erythematosus) to be 40 to 50 cases per 100,000 persons.
Over half of the people with SLE develop a characteristic red, flat facial rash over the bridge of their nose. Because of its shape, it is frequently referred to as the "butterfly rash" of SLE. The rash is painless and does not itch. The facial rash, along with inflammation in other organs, can be precipitated or worsened by exposure to sunlight, a condition called photosensitivity. This photosensitivity can be accompanied by worsening of inflammation throughout the body, called a "flare" of the disease.
Antimalarials are another type of drug commonly used to treat lupus. These drugs prevent and treat malaria, but doctors have found that they also are useful for lupus. A common antimalarial used to treat lupus is hydroxychloroquine. It may be used alone or in combination with other drugs and generally is used to treat fatigue, joint pain, skin rashes, and inflammation of the lungs. Clinical studies have found that continuous treatment with antimalarials may prevent flares from recurring.
This gene encodes an adapter protein that acts as a substrate of the T cell antigen receptor (TCR)-activated protein tyrosine kinase pathway. The encoded protein associates with growth factor receptor bound protein 2, and is thought to play a role TCR-mediated intracellular signal transduction. A similar protein in mouse plays a role in normal T-cell development and activation. Mice lacking this gene show subcutaneous and intraperitoneal fetal hemorrhaging, dysfunctional platelets and impaired viability.
Since other diseases and conditions appear similar to lupus, adherence to classification can greatly contribute to an accurate diagnosis. However, the absence of four of these criteria does not necessarily exclude the possibility of lupus. When a physician makes the diagnosis of SLE, s/he must exclude the possibility of conditions with comparable symptoms, including rheumatoid arthritis, systemic sclerosis (scleroderma), vasculitis, dermatomyositis and arthritis caused by a drug or virus.
Lupus disease, especially when active, could lead to accelerated atherosclerosis (clogging of the arteries) which can develop in young women and could also lead to heart attacks, heart failure, and strokes. Thus, it is vital that patients with lupus, in addition to controlling their disease, exercise and lower other risk factors for heart disease, such as smoking, high blood pressure, and high cholesterol.
This axial, T2-weighted brain magnetic resonance image (MRI) demonstrates an area of ischemia in the right periventricular white matter of a 41-year-old woman with long-standing systemic lupus erythematosus (SLE). She presented with headache and subtle cognitive impairments but no motor deficits. Faintly increased signal intensity was also seen on T1-weighted images, with a trace of enhancement following gadolinium that is too subtle to show on reproduced images. Distribution of the abnormality is consistent with occlusion of deep penetrating branches, such as may result from local vasculopathy, with no clinical or laboratory evidence of lupus anticoagulant or anticardiolipin antibody. Cardiac embolus from covert Libman-Sacks endocarditis remains less likely due to distribution.
Any of a diverse group of plasma polypeptides that bind antigenic proteins and serve as one of the body’s primary defenses against disease. Two different forms exist. The first group of immunoglobulins lies on the surface of mature B cells, enabling them to bind to thousands of antigens. When the antigens are bound, the B plasma cells secrete the second type of immunoglobulins, antigen-specific antibodies, which circulate in the blood and accumulate in lymphoid tissue, esp. the spleen and lymph nodes, binding and destroying specific foreign antigens and stimulating other immune activity. Antibodies also activate the complement cascade, neutralize bacterial toxins and viruses, and function as opsonins, stimulating phagocytosis.
Donna Jackson Nakazawa, researcher, writer, and author of The Autoimmune Epidemic, says "patients with lupus do better if they follow an 'anti-autoimmune diet,' which means consuming whole foods, rather than processed foods. This means lamb, chicken, or turkey; fish with low mercury content; hormone-free eggs; organic vegetables and fresh fruits; whole grains from gluten-free sources; nuts and seeds; and olive, sesame, and flaxseed oils. It also means avoiding highly processed foods, including preserved bread products, cereals and snacks, preserved meats, and other foods that are often full of chemicals, preservatives, and additives."
When the kidneys or central nervous systems are affected immunosuppressive drugs such as cyclophosphamide (Cytoxan) and mycophenolate mofetil (CellCept) may be used. These drugs restrain the overactive immune system by blocking production of immune cells. Side effects may include nausea, vomiting, hair loss, bladder problems, decreased fertility, and increased risk of cancer and infection. The risks increase with the length of treatment.
The first mechanism may arise genetically. Research indicates SLE may have a genetic link. SLE does run in families, but no single causal gene has been identified. Instead, multiple genes appear to influence a person's chance of developing lupus when triggered by environmental factors. HLA class I, class II, and class III genes are associated with SLE, but only classes I and II contribute independently to increased risk of SLE. Other genes which contain risk variants for SLE are IRF5, PTPN22, STAT4, CDKN1A, ITGAM, BLK, TNFSF4 and BANK1. Some of the susceptibility genes may be population specific.
Acute cutaneous: This is the type of skin flare that occurs when your SLE is active. Lesions associated with acute cutaneous lupus appear as flattened areas of red skin on the face, reminiscent of a sunburn—the telltale butterfly rash. These lesions can appear on the arms, legs, and body, and are photosensitive. Though the lesions may discolor the skin, they don't scar. Lesions typically appear during a flare or after sun exposure.
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