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Liver kidney microsomal type 1 antibody (anti-LKM1) is an autoantibody associated with autoimmune hepatitis (AIH). [1] Specifically, its presence in AIH defines type 2 AIH, [ 2 ] [ 3 ] although it has been proposed that anti-liver cytosol type 1 autoantibody without detectable anti-LKM1 can be seen in type 2 AIH. [ 4 ]
An anti-LKM antibody (anti–liver-kidney microsomal antibody or LKM antibody) is any of several autoantibodies that are detected in the serum of patients with different types of acute or chronic liver disease. These antibodies are targeted against antigens of the cytochrome P450 system.
In 1956 the anti-Tg antibody was detected in similar cases, elucidating the autoimmune cause of these characteristics. Later the same year, activating TSH receptor antibodies were discovered. Thyroid microsomal antibodies were discovered in 1964, which were subsequently renamed anti-TPO antibodies due to the identification of their autoantigen. [1]
A number of specific antibodies found in the blood (antinuclear antibody (ANA), anti-smooth muscle antibody (SMA), anti-liver kidney microsomal antibodies (LKM-1, LKM-2, LKM-3), anti soluble liver antigen (SLA), liver–pancreas antigen (LP), and anti-mitochondrial antibody (AMA)) are of use, as is finding an increased immunoglobulin G level.
Thyroid antibodies – both antithyroid peroxidase antibodies (anti-TPO, antithyroid microsomal antibodies, anti-M) and antithyroglobulin antibodies (anti-Tg) – in the disease are elevated, but their levels do not correlate with the severity. [citation needed]
Each autoantibody result should be considered individually and as part of the group. Some disorders, such as systemic lupus erythematosus (SLE) may be more likely if several autoantibodies are present, while others, such as mixed connective tissue disease (MCTD) may be more likely if a single autoantibody, ribonucleic protein (RNP), is the only ...
Anti-mitochondrial antibodies (AMA) are autoantibodies, consisting of immunoglobulins formed against mitochondria, [1] primarily the mitochondria in cells of the liver.. The presence of AMA in the blood or serum of a person may be indicative of the presence of, or the potential to develop, the autoimmune disease primary biliary cholangitis (PBC; previously known as primary biliary cirrhosis).
Antibodies such as anti-smooth muscle antibodies, anti-liver/kidney microsomal antibodies, and the antinuclear antibody are sometimes positive however, this may be due to comorbid autoimmune disorders as appose to autoimmune enteropathy. [54]