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Striated muscle antibodies are associated with late-onset myasthenia gravis (MG), an autoimmune disease caused by antibodies attaching to the acetylcholine receptor. These antibodies bind in a cross-striational pattern to skeletal and heart muscle tissue sections. They are also useful in the diagnosis of thymoma, especially in patients with an onset of MG at ages less than or equal to 45 years. Striational autoantibodies in myasthenia gravis patients recognize I-band titin epitopes. Isolated cases of striated muscle antibodies may be seen in patients with certain autoimmune diseases, rheumatic fever, myocardial infarction, and following some cardiotomy procedures.
| Characteristics | Values |
|---|---|
| Alternative Name | Muscle Skeletal (Striated) Antibodies |
| Associated Diseases | Myasthenia Gravis, Thymoma, Nuclear Hepatitis, Acute Viral Infections, Rheumatic Fever, Myocardial Infarction |
| Antibody Type | IgG |
| Sample Material | Serum |
| Minimum Sample Volume | 0.5 mL |
| Binding Pattern | Cross-striational pattern to skeletal and heart muscle tissue sections |
| Recognized Epitopes | Titin, Ryanodine Receptor (RyR), Kv1.4 (alpha subunit of voltage-gated potassium channel) |
| Testing Methods | Indirect Immunofluorescence (IIF) |
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What You'll Learn
- Striated muscle antibodies are associated with late-onset myasthenia gravis
- They bind in a cross-striational pattern to skeletal and heart muscle tissue sections
- They recognise epitopes on three major muscle proteins
- Striational autoantibodies in myasthenia gravis patients recognise I-band titin epitopes
- Striated muscle antibodies may be seen in patients with certain autoimmune diseases
Striated muscle antibodies are associated with late-onset myasthenia gravis
Striated muscle antibodies, also known as striational antibodies, are associated with late-onset myasthenia gravis (MG). Myasthenia gravis is an autoimmune disease caused by antibodies attaching to the acetylcholine receptor. In most cases, these antibodies bind in a cross-striational pattern to skeletal and heart muscle tissue sections.
Striational antibodies are frequently found in MG patients with late-onset disease and thymoma. They react with epitopes on three major muscle proteins: titin, ryanodine receptor (RyR), and Kv1.4 (a type of voltage-gated potassium channel). Anti-titin antibodies, in particular, are closely associated with older-onset MG. A recent study found that 32% of late-onset MG cases without thymoma were positive for anti-titin antibodies when the cutoff age between early- and late-onset MG was defined as 50 years.
The detection of these three types of striational antibodies can provide specific clinical information and is associated with the subtypes of MG patients. For example, anti-Kv1.4 antibodies have been found in 12-15% of all MG patients, and their presence is a useful marker for the potential development of lethal autoimmune myocarditis and response to calcineurin inhibitors. Additionally, MG patients with anti-Kv1.4 antibodies are at an increased risk for lethal arrhythmias, including ventricular tachycardia and complete atrial ventricular block.
The presence of striational antibodies is also associated with a more severe form of the disease in all MG subgroups. Cytometric cell-based assays with titin, ryanodine receptor, and voltage-gated Kv1.4 have been used to identify anti-striational antibodies in MG patients with myositis and/or myocarditis. These assays have demonstrated that anti-striational antibodies are biomarkers of MG with myositis and/or myocarditis.
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They bind in a cross-striational pattern to skeletal and heart muscle tissue sections
Striated muscle antibodies bind in a cross-striational pattern to skeletal and heart muscle tissue sections. This binding is associated with late-onset myasthenia gravis (MG), an autoimmune disease caused mostly by antibodies attaching to the acetylcholine receptor. In the presence of acetylcholine receptor (AChR) antibodies, striated muscle antibodies can be found in patients with myasthenia gravis. This suggests the presence of thymoma.
Striated muscle antibodies recognise epitopes on three major muscle proteins: titin, ryanodine receptor (RyR), and Kv1.4 (an alpha subunit of the voltage-gated potassium channel [VGKC]). These antibodies are also associated with certain autoimmune diseases, rheumatic fever, myocardial infarction, and cardiotomy procedures.
Striational autoantibodies in myasthenia gravis patients recognise I-band titin epitopes. This is reflected in the research of Lübke E et al. (J Neuroimmunol, 1998) and Romi F et al. (J Neurol, 2000). These studies found muscle autoantibodies in subgroups of myasthenia gravis patients.
The presence of striated muscle antibodies in patients with myasthenia gravis can be useful in diagnosis, especially in older patients when anti-acetylcholine receptor antibodies are negative. It can also aid in the diagnosis of thymoma, particularly in patients with an onset of myasthenia gravis at a younger age (less than or equal to 45 years).
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They recognise epitopes on three major muscle proteins
Striated muscle antibodies recognise epitopes on three major muscle proteins: titin, ryanodine receptor (RyR), and Kv1.4 (an alpha subunit of the voltage-gated potassium channel [VGKC]).
An epitope, also known as an antigenic determinant, is the part of an antigen that is recognised by the immune system, specifically by antibodies, B cells, or T cells. Epitopes are usually non-self proteins, but they can also be sequences derived from the host that can be recognised in autoimmune diseases. The epitopes of protein antigens are divided into two categories: conformational epitopes and linear epitopes. Conformational epitopes are formed by the 3D conformation adopted by the interaction of discontiguous amino acid residues. On the other hand, linear epitopes are determined by a single amino-acid sequence, or the primary structure, rather than the tertiary structure.
There are two main methods of epitope mapping: structural and functional studies. Structural mapping methods include X-ray crystallography, nuclear magnetic resonance, and electron microscopy. Functional mapping methods often use binding assays such as western blot, dot blot, and/or ELISA to determine antibody binding.
B-cell epitopes can be used for the development of antibody therapeutics, peptide-based vaccines, and immunodiagnostic tools. Epitopes are also used in proteomics and the study of other gene products. For example, genetic sequences coding for epitopes recognised by common antibodies can be fused to a gene, allowing the antibody to find the protein or gene product and enabling techniques for localisation, purification, and further molecular characterisation.
Striated muscle antibodies are associated with late-onset myasthenia gravis (MG), an autoimmune disease caused by antibodies attaching to the acetylcholine receptor. Isolated cases of striated muscle antibodies may also be seen in patients with certain autoimmune diseases, rheumatic fever, myocardial infarction, and following some cardiotomy procedures.
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Striational autoantibodies in myasthenia gravis patients recognise I-band titin epitopes
Myasthenia gravis (MG) is an autoimmune disease characterised by muscle weakness, specifically in striated muscles. This muscle weakness is caused by the binding of autoantibodies to the nicotinic acetylcholine receptor (AChR) in the motor endplates, which results in the destruction of the receptor's functional arrangement. While the presence of AChR antibodies is essential for the disease, some MG patients also develop antibodies against non-AChR striated muscle antigens, including titin, an elastic protein of the myofibrillar cytoskeleton.
Striational autoantibodies in MG patients recognise I-band titin epitopes. Immunofluorescence microscopy on single myofibrils has revealed that around 40% of the sera from 18 MG/thymoma patients and 8 late-onset MG patients with thymus atrophy contain antibodies that bind to a more central I-band titin region. This region is composed of homologous immunoglobulin domains and is known to be differentially spliced depending on the muscle type. Notably, all patients with I-band titin antibodies also exhibited antibodies against the main immunogenic region (MIR) of titin.
The occurrence of I-band titin antibodies does not appear to correlate with the severity of MG. However, it has been suggested that there may be an initial immunoreactivity to titin's MIR, followed by reactivity along the titin molecule as the disease progresses. The presence of I-band titin antibodies in MG patients highlights the complex nature of autoantibody responses in this disease and underscores the need for further research to fully understand the role of these antibodies in the disease process.
The detection of striational autoantibodies in MG patients is of clinical significance. The presence of these antibodies, particularly those targeting the I-band region of titin, can provide valuable insights into the pathophysiology of MG and help guide diagnosis and treatment strategies. Furthermore, the identification of specific autoantibody targets, such as titin, offers potential therapeutic avenues for the development of targeted immunotherapies to modulate the immune response and improve patient outcomes.
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Striated muscle antibodies may be seen in patients with certain autoimmune diseases
Striated muscle antibodies are associated with myasthenia gravis (MG), an autoimmune disease caused by antibodies attaching to the acetylcholine receptor. In most cases, patients with myasthenia gravis have antibodies that bind in a cross-striational pattern to skeletal and heart muscle tissue sections. These are known as striational antibodies.
Striated muscle antibodies are also useful in the diagnosis of thymoma, especially in patients with an onset of myasthenia gravis at or below 45 years of age. They can also be used to monitor the efficacy of immunosuppressive treatment in patients with myasthenia gravis.
Isolated cases of striated muscle antibodies may be seen in patients with certain autoimmune diseases, rheumatic fever, myocardial infarction, and following some cardiotomy procedures. IgM anti-striated muscle antibodies may also occur in some patients with nuclear hepatitis and acute viral infections.
Striational antibodies in myasthenia gravis patients recognize I-band titin epitopes. These antibodies are primarily associated with late-onset myasthenia gravis but can also be seen in thymoma.
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Frequently asked questions
Striated muscle antibodies are associated with late-onset myasthenia gravis (MG) and are found in patients with thymoma.
Striated muscle antibodies recognise epitopes on three major muscle proteins: titin, ryanodine receptor (RyR) and Kv1.4 (an alpha subunit of the voltage-gated potassium channel).
Muscle Skeletal (Striated) Antibodies.
Striated muscle antibodies are useful in the diagnosis of myasthenia gravis (MG), especially when anti-acetylcholine receptor antibodies are negative.
The sample material is serum, with a minimum volume of 0.5 mL.
