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STAT1 and STAT3 Gain of Function Immune Deficiency Foundation Patient & Family Handbook For Primary Immunodeficiency Diseases Chapter 15 Immune Deficiency Foundation Patient & Family Handbook For Primary Immunodeficiency Diseases 6th Edition The development of this publication was supported by Shire, now Takeda. 110 West Road, Suite 300 Towson, MD 21204 800.296.4433 www.primaryimmune.org [email protected] Chapter 15 Diseases of Immune Dysregulation: STAT1 and STAT3 Gain of Function Jennifer Leiding, MD, University of South Florida, Tampa, Florida, USA Lisa Forbes Satter, MD, Texas Children’s Hospital, Houston, Texas, USA Introduction Clinical Presentation Immune dysregulation occurs when the immune STAT1 GOF system cannot regulate normal control over Individuals with STAT1 GOF will present to a inflammation, leading to severe inflammatory healthcare provider because of chronic or unusual complications. Two of these diseases are called infections or severe autoimmune disease that is STAT1 Gain of Function (GOF) Disease and not easily controlled with standard immune STAT3 Gain of Function (GOF) Disease. STAT suppressing medications. stands for: signal transducer and activator of transcription. There are six STAT proteins. STATs One of the most common manifestations in are important proteins that enhance immune individuals with STAT1 GOF is chronic infections responses, particularly the production of interferon with a fungus that are mostly limited to gamma, another protein that is crucial for defense mucosal surfaces, skin, and nails, also known as against certain infections and for the control of mucocutaneous candidiasis (CMC). This occurs inflammation. Mutations in STAT proteins can lead in more than 90% of individuals. CMC is an to: infection of the mucus membranes of the mouth (called thrush), gastrointestinal tract, skin, and • Loss of function of the protein where it does nails with Candida or other common skin fungus. not function at all, or Presentation of CMC is usually in childhood, with some as young as age of 1 at the time the • Gain of function of the protein where the infections start. CMC can often be difficult to treat, protein functions too much and cannot be requiring oral anti-fungal medication, and likely will turned off. return when anti-fungal medications are stopped. • Gain of function of the STAT1 and STAT3 More rarely, individuals with STAT1 GOF can be proteins cause diseases of immune susceptible to severe invasive fungal infections. dysregulation, autoimmunity, and increased risk These infections include Aspergilllus, Histoplasma, of infections. Coccidiomycosis, and Cryptococcus. Pneumonia, an infection of the lungs, is the most common site of invasive fungal infection. Definition Bacterial infections with common community STAT1 and STAT3 GOF Diseases are genetic acquired bacterial organisms also occur in disorders in which immune cells are over activated. individuals with STAT1 GOF. The infections have a STAT1 and STAT3 are proteins found inside most tendency to occur in the lungs as lower respiratory immune cells that are activated after the immune tract infections, bronchitis, or pneumonia. cell itself is activated by other signaling proteins Bacterial infection of the eye, skin, and nail beds called cytokines, such as interferon gamma and are also common. Individuals with STAT1 GOF IL-6, respectively. Once the cell is stimulated, are also susceptible to Mycobacterial infections. the STAT protein activates and encourages other Mycobacterium is a class of bacteria that typically immune responses to help the cell to kill bacterial, only infect individuals with immunodeficiency or viral, and fungal infections. Overactive STAT1 and those that are immune suppressed. STAT3 lead to dysfunction of both STAT1 and STAT3, and it places individuals at increased risk of infections and autoimmune disease. 74 Chapter 15: Diseases of Immune Dysregulation: STAT1 and STAT3 Gain of Function Viral infections are also a source of concern in these Clinical Presentation individuals. The most common viruses causing infection are Herpes family viruses such as herpes STAT3 GOF simplex virus, the cause of cold sores; varicella zoster Individuals with STAT3 GOF most commonly present virus, the virus that causes chickenpox and shingles; with severe early onset autoimmunity. Individuals Epstein Barr virus (EBV), the cause of mononucleosis; often have more than one autoimmune disease and human papilloma virus (HPV), the cause of warts; the symptoms of autoimmunity are severe and hard and cytomegalovirus (CMV), a virus that typically to control. The most common types of autoimmunity goes unnoticed by people with competent immune involve the endocrine (hormone) system, the systems but causes severe disease in individuals hematologic system (blood cells and platelets), with immune deficiency. These viruses can cause gastrointestinal tract, lungs, and liver. Thyroid disease skin infection, pneumonia, or enter the blood is the most common autoimmune endocrine disorder, stream where they cause widespread infection and treated with thyroid replacement. Hematologic dysfunction of different organ systems. autoimmune disorders include autoimmune destruction of the blood cells and platelets that Most individuals develop some form of autoimmunity can be life threatening and require transfusions of by the third decade of life. The autoimmunity that blood or platelets. Enteropathy due to autoimmune occurs in STAT1 GOF often affects the endocrine destruction of the lining of the intestinal tract as and hematologic systems. Hypothyroidism and early chronic diarrhea can cause severe malabsorption onset diabetes are common. Autoimmune hemolytic of nutrients and failure to thrive. In addition, some anemia and autoimmune thrombocytopenia individuals may have inflammation of the intestine (autoimmune destruction of red blood cells or or colon, termed colitis, that can also lead to poor platelets) can be life threatening and may require weight gain, abdominal pain, chronic diarrhea, and blood or platelet transfusions. A subset of individuals blood in the stool. Autoimmune destruction of the with STAT1 GOF have symptoms very similar liver or lung can lead to organ dysfunction or failure to Immunodysregulation-Polyendocrinopathy- respectively. Other autoimmune disorders, including Enteropathy-X-linked (IPEX). (See IPEX Chapter.) eczema, rheumatoid arthritis, and eye disease, can These individuals will have early onset autoimmunity, also occur. such as diabetes mellitus and hypothyroidism as well. In addition, individuals with STAT1 GOF with similar A major feature of individuals with STAT3 GOF is symptoms to IPEX can have severe enteropathy. the presence of lymphoproliferative disease. In Enteropathy is destruction of the small and large lymphoproliferative disease, immune cells in lymph intestine’s absorptive surface. Individuals with organs grow at an abnormal rate. Lymphoid organs enteropathy have substantial difficulty in absorbing include the spleen, liver, and lymph nodes and when nutrients and have very frequent diarrhea with weight this growth occurs, these organs will expand causing loss and malnutrition. Because of poor nutrition, abnormally large lymph nodes, liver, and/or spleen. individuals will have growth failure. Lymphoproliferation, which is growth of lymphocytes in increased quantities, can ultimately impact the Other clinical features include a susceptibility to the function of the affected organ, and it can prevent development of aneurysms in the brain. An aneurysm the lymph cells from responding appropriately when is an abnormal out-pouching of a blood vessel that there is infection. causes the blood vessel wall to become weak. Small numbers of individuals have learning disabilities. Acute short stature is another common feature in Some individuals also demonstrate susceptibility to individuals with STAT3 GOF. The height of individuals skin, gastrointestinal tract, and throat cancer. is often substantially lower than the expected normal for age, and this persists to adulthood. Individuals The immune features in individuals with STAT1 often are treated with growth hormone replacement, GOF can be very variable. Individuals may have low but this is controversial as to whether there is lymphocyte counts and function including low T cell, any benefit. B cell, and NK cells. Some individuals may also have hypogammaglobulinemia (low IgG, low IgA, or low Immune abnormalities also are very variable in IgM). Susceptibility to infections, particularly viruses individuals with STAT3 GOF. Low T cell and B cell and Mycobacterium, occurs when there are abnormal quantities can occur as can hypogammaglobulinemia lymphocyte counts and/or function. (low IgG). It is often hard to differentiate if the IDF Patient & Family Handbook 75 immune abnormalities are secondary to treatment will dictate whether an individual may need to of the autoimmune features. Infections can occur in receive prophylaxis against bacterial, fungal, or viral STAT3 GOF, but the autoimmune features are the infections. Some individuals receive immunoglobulin more common presentation. Infections, including (Ig) replacement therapy when there is low IgG. bacterial, viral, mycobacterial, and fungal, can be severe, invasive, and life threatening. Prophylaxis The biology that leads to STAT1 and STAT3 against infections is often used especially if activation has afforded the opportunity to use a substantial number of immune suppressing specific therapeutic agents that interfere with the medications are used
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