|Young woman with the typical "butterfly rash" found in systemic lupus erythematosus|
|Specialty||Rheumatology, immunology, gastroenterology, neurology, dermatology|
|Symptoms||Depends on the condition. Commonly low grade fever, feeling tired|
|Types||List of autoimmune diseases (alopecia areata, celiac disease, diabetes mellitus type 1, Graves' disease, inflammatory bowel disease, multiple sclerosis, psoriasis, rheumatoid arthritis, systemic lupus erythematosus, others)|
|Medication||Nonsteroidal anti-inflammatory drugs, immunosuppressants, intravenous immunoglobulin|
|Frequency||24 million / 7% (USA)|
An autoimmune disease is a condition arising from an abnormal immune response to a functioning body part. There are at least 80 types of autoimmune diseases. Nearly any body part can be involved. Common symptoms include low grade fever and feeling tired. Often symptoms come and go.
The cause is generally unknown. Some autoimmune diseases such as lupus run in families, and certain cases may be triggered by infections or other environmental factors. Some common diseases that are generally considered autoimmune include celiac disease, diabetes mellitus type 1, Graves' disease, inflammatory bowel disease, multiple sclerosis, psoriasis, rheumatoid arthritis, and systemic lupus erythematosus. The diagnosis can be difficult to determine.
Treatment depends on the type and severity of the condition. Nonsteroidal anti-inflammatory drugs (NSAIDs) and immunosuppressants are often used. Intravenous immunoglobulin may also occasionally be used. While treatment usually improves symptoms, they do not typically cure the disease.
About 24 million (7%) people in the United States are affected by an autoimmune disease. Women are more commonly affected than men. Often they start during adulthood. The first autoimmune diseases were described in the early 1900s.
Signs and symptoms
Autoimmune diseases present similar symptoms across the more than eighty different types. The appearance and severity of these signs and symptoms depends on the location and type of autoimmune response that occurs. An individual may also have more than one autoimmune disease simultaneously, and display symptoms of multiple diseases. Signs and symptoms presented, and the disease itself, can be influenced by various other factors such as age, hormones, and environmental factors. In general, the common symptoms are:
- Low grade fever
- General feeling of unwell (malaise)
- Muscle aches and joint pain
- Rash on different areas of the skin
The appearance of these signs and symptoms can fluctuate, and when they reappear, it is known as a flare-up. Such signs and symptoms may aid in diagnosis by supporting the results from biologic markers of autoimmune diseases.
There are several areas that are commonly impacted by autoimmune diseases. These areas include: blood vessels, underlying connective tissues, joints and muscles, red blood cells, skin, and endocrine glands, like thyroid or pancreas glands.
These diseases tend to have characteristic pathological effects which characterize them as an autoimmune disease. Such features include damage to or destruction of tissues where there is an abnormal immune response, altered organ growth, and altered organ function depending on the location of the disease. Some diseases are organ specific and are restricted to affecting certain tissues, while others are systemic diseases that impact many tissues throughout the body. Signs and symptoms may vary depending on which of these categories an individual’s disease falls under.
Research suggests an overall correlation between autoimmune diseases and cancer, in that having an autoimmune disease increases the risk or likelihood of developing certain cancers. Autoimmune diseases cause inflammation through a variety of mechanisms, however, the way in which inflammation is created does not greatly influence cancer risk. Rather, the cancer risk is largely dependent on the fact that all autoimmune diseases increase chronic inflammation which has been linked to cancer. Below are some autoimmune diseases most commonly linked to cancer including celiac disease, inflammatory bowel disease (Crohn's disease and ulcerative colitis), multiple sclerosis, rheumatoid arthritis, and systemic lupus erythematosus.
The cause is generally unknown. Some autoimmune diseases such as lupus run in families, and certain cases may be triggered by infections or other environmental factors. There are more than 100 autoimmune diseases. Some common diseases that are generally considered autoimmune include celiac disease, diabetes mellitus type 1, Graves' disease, inflammatory bowel disease, multiple sclerosis, psoriasis, rheumatoid arthritis, and systemic lupus erythematosus.
Autoimmune diseases are conditions in which the human immune system attacks healthy human tissues within the body. The exact genes responsible for causing each autoimmune disease have not been completely isolated. However, several experimental methods such as the genome-wide association scans have been used to identify certain genetic risk variants. Research focusing on both genome scanning and family trait inheritance analysis has enabled scientists to further understand the etiology of autoimmune diseases such as Type 1 diabetes and Rheumatoid arthritis.
- Type 1 diabetes is a condition in which pancreatic β-cells are targeted and destroyed by the immune system. The condition is a result of neo-natal mutations to the insulin gene (INS) which is responsible for mediating the production of the insulin in the pancreas. The INS gene is located on the short arm of chromosome 11p15.5 in between the genes for tyrosine hydroxylase and insulin-like growth factor II. In addition to chromosome 11, a genetic determinant of type 1 diabetes is a locus called the major histocompatibility complex (MHC) located on chromosome 6p21.
- Rheumatoid arthritis: Although there is no complete genetic mapping for this condition, several genes are thought to play a role in causing RA. The genes that influence the human immune system contain a TNF receptor associated factor 1(TRAF1). This TRAF1 is located on chromosome 9q33-34. In addition, B1 genes in the human genome contain an increased concentration of HLA-DRB1 alleles that are most commonly seen in RA patients. RA can vary in severity as a consequence of polymorphisms within the genome.
A range of environmental factors have been recognized as either having a direct role in development, or being a catalyst to many autoimmune diseases. Current studies indicate up to seventy percent of autoimmune disease are due to environmental factors, including: chemicals, infection, diet, and gut dysbiosis. A single set of steps has been identified to be the most likely theory for autoimmune disease onset.
- Environmental triggers
- Reduced oral tolerance
- Gut dysbiosis
- Enhanced gut permeability
- Increased immune reactivity
Chemicals can be found within the direct environment or in the form of drugs, including: hydrazines, hair dyes, trichloroethylene, tartrazines, hazardous wastes, and industrial emissions.
UV radiation is found to be a possible cause of development of the autoimmune disease dermatomyositis, exposure to pesticides plays a role in rheumatoid arthritis development, and vitamin D has been found to be a key in preventing immune dysfunctions in older populations. Infectious agents are considered T cell activators, a step needed for activation of autoimmune diseases. These mechanisms are relatively unknown, but are one of the current theories to explain autoimmune diseases triggered by infection such as Guillain-Barre syndrome and rheumatic fever.
Following are the few examples of autoimmune diseases.
Coeliac disease presents the strongest associations to gastrointestinal and lymphoproliferative cancers. In coeliac disease, the autoimmune reaction is caused by the body’s loss of immune tolerance to ingested gluten, found primarily in wheat, barley, and rye. This explains the increased risk of gastrointestinal cancers, as the gastrointestinal tract includes the esophagus, stomach, small intestine, large intestine, rectum, and anus, all areas that the ingested gluten would traverse in digestion. The incidence of gastrointestinal cancer can be partially reduced or eliminated if a patient removes gluten from their diet. Additionally, celiac disease is correlated with lymphoproliferative cancers.
Inflammatory bowel disease
Inflammatory bowel disease is associated with cancers of the gastrointestinal tract and some lymphoproliferative cancers. Inflammatory bowel disease (IBD) can be further categorized as Crohn's disease or ulcerative colitis. In both cases, individuals with IBD lose immune tolerance for normal bacteria present in the gut microbiome. In this case, the immune system attacks the bacteria and induces chronic inflammation, which has been linked to increased cancer risk.
Multiple sclerosis is associated with decreased risk of cancer overall but an increased risk of central nervous system cancer, primarily in the brain. Multiple sclerosis is a neurodegenerative disease in which T-cells – a specific type of immune cells – attack the important myelin sheath in brain neurons. This reduces the nervous system function, creating inflammation and subsequent cancer of the brain.
Rheumatoid arthritis presents mild, yet significant associations with focal cancers all throughout the body as well as lymphoproliferative cancers. In rheumatoid arthritis, cells that make up the body’s joints and cartilages become invasive and induce local inflammation. Additionally, the chronic inflammation and over-activation of the immune system creates an environment that favors further malignant transformation of other cells. This can explain the associations to cancer of the lungs and skin as well as the increased risk of other hematologic cancers none of which are directly affected by the inflammation of joints.
Systemic lupus erythematosus is associated with focal cancers throughout the body and lymphoproliferative cancers. Systemic lupus erythematosus affects multiple organ systems and is characterized by a widespread loss of immune tolerance. The chronic inflammation throughout the entire body promotes the malignant transformation of other cells which contributes to the increased risk of systemic and lymphoproliferative cancers. Conversely, systemic lupus erythematosus is correlated with a decrease in some cancers. This is best explained by increased immunosurveillance in these areas, however, the mechanism for why these areas experience lower incidence is poorly understood.
In aplastic anemia the body fails to produce blood cells in sufficient numbers. Blood cells are produced in the bone marrow by stem cells that reside there. Aplastic anaemia causes a deficiency of all blood cell types: red blood cells, white blood cells, and platelets.
The human immune system typically produces both T cells and B cells that are capable of being reactive with self-antigens, but these self-reactive cells are usually either killed prior to becoming active within the immune system, placed into a state of anergy (silently removed from their role within the immune system due to over-activation), or removed from their role within the immune system by regulatory cells. When any one of these mechanisms fail, it is possible to have a reservoir of self-reactive cells that become functional within the immune system. The mechanisms of preventing self-reactive T cells from being created take place through negative selection process within the thymus as the T cell is developing into a mature immune cell.
Some infections, such as Campylobacter jejuni, have antigens that are similar (but not identical) to our own self-molecules. In this case, a normal immune response to C. jejuni can result in the production of antibodies that also react to a lesser degree with gangliosides of myelin sheath surrounding peripheral nerves' axons (i.e., Guillain–Barré). A major understanding of the underlying pathophysiology of autoimmune diseases has been the application of genome-wide association scans that have identified a degree of genetic sharing among the autoimmune diseases.
Autoimmunity, on the other hand, is the presence of self-reactive immune response (e.g., auto-antibodies, self-reactive T cells), with or without damage or pathology resulting from it. This may be restricted to certain organs (e.g. in autoimmune thyroiditis) or involve a particular tissue in different places (e.g. Goodpasture's disease which may affect the basement membrane in both the lung and the kidney).
There are many theories as to how an autoimmune disease state arises. Some common ones are listed below.
- Direct evidence from transfer of disease-causing antibody or disease-causing T lymphocyte white blood cells
- Indirect evidence based on reproduction of the autoimmune disease in experimental animals
- Circumstantial evidence from clinical clues
Symptoms of early autoimmune disease are often the exact same as common illnesses, including: fatigue, fever, malaise, joint pain, and rash. Due to the fact symptoms vary for affected location, disease causing agents, and individuals, it is difficult for proper diagnosis. Typically, diagnosis begins with looking into a patient’s family's history for genetic predisposition. This is combined with various tests, as no single test can identify an autoimmune disease.
A test used to identify abnormal proteins, known as antinuclear antibodies, produced when the body attacks its own tissues. It may test positive in several disorders. This test is most useful for diagnosing systemic lupus erythematosus, having a 95% positive test rate.
Complete blood count
A test taking measurements on maturity levels, count, and size of blood cells. Targeted cells include: red blood cells, white blood cells, hemoglobin, hematocrit, and platelets. Based on increased or decreased numbers in these counts, underlying medical conditions may be present; typically, autoimmune disease is represented by low white blood cell count (Leukopenia). For proper diagnosis, further testing is needed.
C reactive protein
Erythrocyte sedimentation rate
If these tests are indicative antibody abnormalities and inflammation, further tests will be conducted to identify the autoimmune disease present.
Treatment depends on the type and severity of the condition. The majority of the autoimmune diseases are chronic and there is no definitive cure, but symptoms can be alleviated and controlled with treatment. Overall, the aim of the various treatment methods is to lessen the presented symptoms for relief and manipulate the body’s autoimmune response, while still preserving the ability of the patient to combat diseases that they may encounter. Traditional treatment options may include immunosuppressant drugs to weaken the overall immune response, such as:
- Non-steroidal anti-inflammatory drugs (NSAIDs) to reduce inflammation
- Glucocorticoids to reduce inflammation
- Disease-modifying anti-rheumatic drugs (DMARDs) to decrease the damaging tissue and organ effects of the inflammatory autoimmune response
Other standard treatment methods include:
- Vitamin or hormone supplements for what the body is lacking due to the disease (insulin, vitamin B12, thyroid hormone, etc.)
- Blood transfusions if the disease is blood related
- Physical therapy if the disease impacts bones, joints, or muscles
Because these drugs aim to reduce the immune response against the body’s own tissues, there are side effects of these traditional treatment methods, such as being more vulnerable to infections that can potentially be life threatening. There are new advancements in medicine for the treatment of autoimmune diseases that are currently being researched, developed, and used today, especially when traditional treatment options fail. These methods aim to either block the activation of pathogenic cells in the body, or alter the pathway that suppresses these cells naturally. The goal for these advancements is to have treatment options available that are less toxic to the patient, and have more specific targets. Such options include:
- Monoclonal antibodies that can be used to block pro-inflammatory cytokines
- Antigen-specific immunotherapy which allows immune cells to specifically target the abnormal cells that cause autoimmune disease
- Co-stimulatory blockade that works to block the pathway that leads to the autoimmune response
- Regulatory T cell therapy that utilizes this special type of T cell to suppress the autoimmune response
The first estimate of US prevalence for autoimmune diseases as a group was published in 1997 by Jacobson, et al. They reported US prevalence to be around 9 million, applying prevalence estimates for 24 diseases to a US population of 279 million. Jacobson's work was updated by Hayter & Cook in 2012. This study used Witebsky's postulates, as revised by Rose & Bona, to extend the list to 81 diseases and estimated overall cumulative US prevalence for the 81 autoimmune diseases at 5.0%, with 3.0% for males and 7.1% for females. The estimated community prevalence, which takes into account the observation that many people have more than one autoimmune disease, was 4.5% overall, with 2.7% for males and 6.4% for females.
In both autoimmune and inflammatory diseases, the condition arises through aberrant reactions of the human adaptive or innate immune systems. In autoimmunity, the patient's immune system is activated against the body's own proteins. In chronic inflammatory diseases, neutrophils and other leukocytes are constitutively recruited by cytokines and chemokines, resulting in tissue damage.
Mitigation of inflammation by activation of anti-inflammatory genes and the suppression of inflammatory genes in immune cells is a promising therapeutic approach. There is a body of evidence that once the production of autoantibodies has been initialized, autoantibodies have the capacity to maintain their own production.
Stem cell transplantation is being studied and has shown promising results in certain cases.
Altered glycan theory
According to this theory, the effector function of the immune response is mediated by the glycans (polysaccharides) displayed by the cells and humoral components of the immune system. Individuals with autoimmunity have alterations in their glycosylation profile such that a proinflammatory immune response is favored. It is further hypothesized that individual autoimmune diseases will have unique glycan signatures.
According to the hygiene hypothesis, high levels of cleanliness expose children to fewer antigens than in the past, causing their immune systems to become overactive and more likely to misidentify own tissues as foreign, resulting in autoimmune or allergic conditions such as asthma.
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