Dominic Stone
Celiac disease is an autoimmune disease that affects the small intestine, and it is triggered by the consumption of gluten. Smooth muscle antibodies (SMA) are one of the most prevalent non-organ-specific autoantibodies found in the serum of celiac disease patients. SMA is commonly associated with type 1 autoimmune hepatitis, and its presence can indicate the severity of intestinal injury in celiac patients. While the frequency of autoantibodies specific to other autoimmune diseases may not be elevated in patients with celiac disease, there is an increased frequency of autoimmune diseases in individuals with celiac disease. This text will explore the relationship between celiac disease and elevated smooth muscle antibodies, discussing the clinical implications and providing insights into the mechanisms underlying this association.
| Characteristics | Values |
|---|---|
| Smooth muscle antibody (SMA) | One of the most prevalent non-organ specific autoantibodies in the serum of celiac disease (CD) patients |
| IgA type AAA | Detected in CD patients at significantly higher values than controls |
| SMA-positive patients | Had significantly higher values of AAA, increased number of autoimmune disorders, delayed menarche, lower hemoglobin levels, increased fecal a-I antitrypsin clearance, and more severe diarrhea |
| Antimicrofilament IgA | Present in 27% of coeliacs |
| IgA anti-MF antibodies | A common finding in patients with untreated CD |
| SMA-T/G | Detected by indirect immunofluorescence (IFL) on kidney sections and associated with type 1 autoimmune hepatitis (AIH) |
| Anti-actin IgA antibodies | Found in sera of coeliacs |
| AAA | Highly correlated with tissue transglutaminase, antigliadin antibodies, and severity of intestinal injury |
| SMA | Detected in the sera of 35 consecutive CD patients |
| Autoimmune diseases | Increased frequency in individuals with celiac disease |
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What You'll Learn
- Smooth muscle antibody (SMA) is prevalent in celiac disease (CD) patients
- SMA is a marker of type I autoimmune hepatitis
- SMA is associated with increased autoimmune disorders
- SMA is detected in the sera of CD patients
- SMA is identified using different techniques like immunofluorescence and enzyme-linked immunosorbent assay (ELISA)
Smooth muscle antibody (SMA) is prevalent in celiac disease (CD) patients
Smooth muscle antibody (SMA) is one of the most prevalent non-organ-specific autoantibodies in the serum of celiac disease (CD) patients. SMA is commonly regarded as a marker of type I autoimmune hepatitis, and its presence in CD patients indicates a disturbed architecture of intestinal epithelial cells.
In a study, SMA was detected in the sera of 35 consecutive CD patients. At diagnosis, SMA-positive patients exhibited significantly higher values of AAA (anti-actin autoantibodies), increased numbers of autoimmune disorders, delayed menarche, lower haemoglobin levels, increased faecal a-I antitrypsin clearance, and more severe diarrhoea.
Another study investigated the levels of various autoantibodies, including SMA, in patients with celiac disease, healthy controls, and autoimmune hypothyroid patients. This study did not find a significant increase in SMA levels in patients with celiac disease compared to healthy controls.
The presence of SMA in CD patients may be explained by the association between celiac disease and autoimmune hepatitis. Celiac disease has been linked to autoimmune diseases of the hepatobiliary system, and SMA is a known marker of type I autoimmune hepatitis.
Furthermore, the gluten challenge in CD patients can cause a rapid distortion of the microvillus structure and disorganization of the actin network on the intestinal mucosa. This disruption of the cytoskeleton network, which is essential for the ultrastructural architecture of enterocytes, may contribute to the prevalence of SMA in CD patients.
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SMA is a marker of type I autoimmune hepatitis
Smooth muscle antibody (SMA) is a marker of type 1 autoimmune hepatitis. SMA is one of the most prevalent non-organ-specific autoantibodies in the serum of celiac disease (CD) patients. SMA tests are used to help find out if autoimmune hepatitis could be the cause of liver damage. SMA is a highly sensitive marker of the disturbed architecture of intestinal epithelial cells of CD patients.
SMA tests are usually carried out after the results of liver function tests indicate potential liver damage. SMA is a sign of a chronic liver condition called autoimmune hepatitis, which is an autoimmune disease. In this disease, the immune system produces autoantibodies that attack the body's healthy cells and organs, in this case, the liver. SMA mainly attacks certain proteins found in smooth muscle, such as those in the intestines, stomach, and blood vessels.
Autoimmune hepatitis (AIH) is a rare disorder that can lead to fatal liver dysfunction. It is characterized by chronic and progressive inflammation of the liver from an unknown cause. The disease typically affects young women but can occur in people of all ages. AIH often presents with non-specific clinical symptoms such as malaise, anorexia, jaundice, and arthralgias. In older patients, liver cirrhosis may be present at the time of diagnosis.
The diagnosis of type 1 AIH is facilitated by an AIH scoring system and serological tests. A positive anti-SMA serology, along with antinuclear antibody (ANA) and anti-liver kidney microsomal type 1 antibodies (anti-LKM-1), are the serologic markers required for the diagnosis of AIH. Type 1 AIH is distinguished by the presence of SMA with or without ANA. Treatment for AIH often involves medications that decrease immune system activity, such as immunosuppressive therapy.
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SMA is associated with increased autoimmune disorders
Smooth muscle antibody (SMA) is one of the most prevalent non-organ-specific autoantibodies in the serum of celiac disease (CD) patients. SMA is detected in the sera of consecutive CD patients. SMA-positive patients have significantly higher values of AAA, an increased number of autoimmune disorders, delayed menarche, lower hemoglobin levels, increased fecal a-I antitrypsin clearance, and more severe diarrhea.
SMA is also associated with spinal muscular atrophy, a neuromuscular disorder characterised by motor neuron degeneration. SMA is the most common genetic cause of mortality in infants. SMA patients have a higher susceptibility to infection and exacerbated disease progression caused by neuroinflammation.
SMA is also associated with chronic C hepatitis, systemic lupus erythematosus, and Hodgkin's disease.
Celiac disease is associated with an increased frequency of autoimmune disease. An association between celiac disease and autoimmune hepatitis and primary biliary cirrhosis, which are autoimmune diseases of the hepatobiliary system, has been shown.
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SMA is detected in the sera of CD patients
Smooth muscle antibody (SMA) is one of the most prevalent non-organ-specific autoantibodies in the serum of celiac disease (CD) patients. SMA is detected in the sera of CD patients and is specific for the protein actin, a major component of the cytoskeleton of epithelial cells.
SMA-positive patients had significantly higher values of AAA, an increased number of autoimmune disorders, delayed menarche, lower hemoglobin levels, increased fecal a-I antitrypsin clearance, and more severe diarrhea. The presence of increased IgA AAA serum levels is a highly sensitive marker of the disturbed architecture of intestinal epithelial cells of CD patients.
SMA-T/G and anti-MF antibodies are present in about 80% of patients with AIH-1, and similar anti-MF antibodies belonging to the IgA class have also been reported in CD. In untreated CD, IgA anti-MF antibodies are a common finding. IFL on fibroblasts was the most sensitive method for the detection of anti-actin antibodies in CD.
In a study of individuals with celiac disease, Utiyema et al. did not find statistically different frequencies of positivity between individuals with celiac disease and healthy controls. The frequency of autoantibodies specific to other autoimmune diseases was not elevated in patients with celiac disease. However, an increased frequency of autoimmune disease was observed in individuals with celiac disease compared to other groups.
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SMA is identified using different techniques like immunofluorescence and enzyme-linked immunosorbent assay (ELISA)
Smooth muscle antibody (SMA) is one of the most prevalent non-organ-specific autoantibodies in the serum of celiac disease (CD) patients. SMA can be identified using different techniques such as immunofluorescence and enzyme-linked immunosorbent assay (ELISA).
SMA can be detected using immunofluorescence, which involves processing cells with antibodies and staining them with dyes to visualise the antibodies under a microscope. For example, in one study, cells were fixed with paraformaldehyde and processed for immunofluorescence with antibodies recognising phosphorylated FAK and α-SMA. Another study detected SMA using indirect immunofluorescence on a primate oesophagus substrate.
ELISA is a widely used technique for detecting and quantifying antibodies, antigens, proteins, and other substances. It involves immobilising the antigen on a solid surface, such as a microplate, and then adding a sample containing the antibody of interest. After washing away unbound components, an enzyme-labelled antibody is added, forming a complex. The presence of the antibody-antigen complex can be detected by measuring the activity of the reporter enzyme, often through the addition of a substrate that produces a measurable product.
In the context of celiac disease, ELISA assays have been used to detect IgA anti-actin antibodies (AAA) and SMA. One study found significantly higher AAA values in CD patients compared to controls using a modified commercial ELISA assay. Another study detected SMA in the sera of consecutive CD patients. These studies highlight the utility of ELISA in diagnosing and understanding the clinical relevance of SMA in celiac disease.
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Frequently asked questions
Smooth muscle antibodies (SMA) are non-organ specific autoantibodies that target actin, a major component of the cytoskeleton of epithelial cells.
Smooth muscle antibodies in patients with celiac disease can be detected using different techniques such as enzyme-linked immunosorbent assay (ELISA) and indirect immunofluorescence on kidney sections or primate esophagus substrate.
Elevated smooth muscle antibodies in celiac disease may indicate intestinal epithelial cell damage and are associated with increased autoimmune disorders, delayed menarche, lower hemoglobin levels, severe diarrhea, and more severe complications.
