Lupus is a chronic autoimmune condition in which the immune system attacks the body’s own healthy tissue and organs. Depending on the specific patient, lupus can cause high levels of persistent inflammation that can negatively affect various parts of the body. Lupus patients often experience tissue damage that affects the heart, joints, brain, kidneys, lungs and endocrine glands (such as the adrenals and thyroid gland). Although it’s not completely known why this happens, lupus risk factors are believed to include: (2)
Lupus band test. Microphotograph of a histologic section of human skin prepared for direct immunofluorescence using an anti-IgG antibody. The skin is from a patient with systemic lupus erythematosus and shows IgG deposit at 2 different places: the first is a band-like deposit along the epidermal basement membrane ("lupus band test" is positive); the second is within the nuclei of the epidermal cells (anti-nuclear antibodies).
A genetic disorder is a disease caused in whole or in part by a change in the DNA sequence away from the normal sequence. Genetic disorders can be caused by a mutation in one gene (monogenic disorder), by mutations in multiple genes (multifactorial inheritance disorder), by a combination of gene mutations and environmental factors, or by damage to chromosomes (changes in the number or structure of entire chromosomes, the structures that carry genes).
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.
Drug-induced lupus erythematosus (DIL) Some drugs can cause lupus, resulting in symptoms such as rash, arthritis, hair loss, and fever. “Once medications are discontinued, the symptoms go away,” says Roberto Caricchio, MD, the interim section chief of rheumatology at Temple University Hospital in Philadelphia and the director of the Temple Lupus Clinic at the Lewis Katz School of Medicine.
Gluten can also lead to what’s known as molecular mimicry. The gluten protein, gliadin, resembles many of your body’s own tissues, particularly thyroid tissue. If you have Celiac disease, gluten intolerance, or a leaky gut, your immune system releases gliadin antibodies every time you eat gluten. Because gliadin looks so similar to your own tissues, sometimes these antibodies mistakenly attack other organs and systems, from the skin to the thyroid to the brain. This case of mistaken identity often leads to full-blown autoimmune disease.
Tingible body macrophages (TBMs) – large phagocytic cells in the germinal centers of secondary lymph nodes – express CD68 protein. These cells normally engulf B cells that have undergone apoptosis after somatic hypermutation. In some people with SLE, significantly fewer TBMs can be found, and these cells rarely contain material from apoptotic B cells. Also, uningested apoptotic nuclei can be found outside of TBMs. This material may present a threat to the tolerization of B cells and T cells. Dendritic cells in the germinal center may endocytose such antigenic material and present it to T cells, activating them. Also, apoptotic chromatin and nuclei may attach to the surfaces of follicular dendritic cells and make this material available for activating other B cells that may have randomly acquired self-specificity through somatic hypermutation. Necrosis, a pro-inflammatory form of cell death, is increased in T lymphocytes, due to mitochondrial dysfunction, oxidative stress, and depletion of ATP.
Lupus is diagnosed when a person has several features of the disease (including symptoms, findings on examination, and blood test abnormalities). The American College of Rheumatology has devised criteria to assist doctors in making the correct diagnosis of lupus. A person should have at least four of the following 11 criteria, either at the same time or one after the other, to be classified as having lupus. These criteria include:
Regulatory T cells (Tregs) are a population of CD4+ T cells with a unique role in the immune response. Tregs are crucial in suppressing aberrant pathological immune responses in autoimmune diseases, transplantation, and graft-vs-host disease after allogeneic hematopoietic stem cell transplantation. Tregs are activated through the specific T-cell receptor, but their effector function is nonspecific and they regulate the local inflammatory response through cell-to-cell contact and cytokine secretion. Tregs secrete interleukin (IL)-9 (IL-9), IL-10, and transforming growth factor-beta 1 (TGF-beta 1), which aid in the mediation of immunosuppressive activity.
There is no single diagnostic test for systemic lupus. The test you will hear most about is called the antinuclear antibody (ANA) test. This is not a specific test for lupus, however. In fact, a variety of laboratory tests are used to detect physical changes or conditions in your body that can occur with lupus. Each test result adds more information to the picture your doctor is forming of your illness.
Lupus, a chronic autoimmune disorder that causes inflammation, creates a wide range of signs and symptoms. Systemic lupus erythematosus, the most common form of the condition, can potentially involve any major organ system of the body, says Neil Kramer, MD, co-medical director at the Institute for Rheumatic and Autoimmune Diseases at Overlook Medical Center in Summit, New Jersey. “Therefore, the first signs and symptoms vary from patient to patient.”
More serious organ involvement with inflammation occurs in the brain, liver, and kidneys. White blood cells can be decreased in SLE (referred to as leukopenia or leucopenia). Also, low blood-clotting factors called platelets (thrombocytopenia) can be caused by lupus. Leukopenia can increase the risk of infection, and thrombocytopenia can increase the risk of bleeding. Low red blood cell counts (hemolytic anemia) can occur.
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.
Research and documentation of the disease continued in the neoclassical period with the work of Ferdinand von Hebra and his son-in-law, Moritz Kaposi. They documented the physical effects of lupus as well as some insights into the possibility that the disease caused internal trauma. Von Hebra observed that lupus symptoms could last many years and that the disease could go "dormant" after years of aggressive activity and then re-appear with symptoms following the same general pattern. These observations led Hebra to term lupus a chronic disease in 1872.
In addition to helping with lupus nephritis, these drugs may be prescribed to reduce inflammation of the heart and the lining surrounding the lungs. Disease-modifying antirheumatic drugs (DMARDs) used for rheumatoid arthritis treatment, such as methotrexate, may be an effective and well-tolerated option for reducing swelling in patients with severe arthritis, adds Caricchio. DMARDs are another type of immunosuppressant.
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