What role does Alpha-1-antitrypsin play in the disease?

Disorders of this protein include alpha-1 antitrypsin deficiency, an autosomal codominant hereditary disorder in which a deficiency of alpha-1 antitrypsin leads to a chronic uninhibited tissue breakdown. This causes the degradation especially of lung tissue and eventually leads to characteristic manifestations of pulmonary emphysema. Evidence has shown that cigarette smoke can result in oxidation of methionine 358 of α1-antitrypsin (382 in the pre-processed form containing the 24 amino acid signal peptide), a residue essential for binding elastase; this is thought to be one of the primary mechanisms by which cigarette smoking (or second-hand smoke) can lead to emphysema. Because A1AT is expressed in the liver, certain mutations in the gene encoding the protein can cause misfolding and impaired secretion, which can lead to liver cirrhosis.

An extremely rare form of Pi, termed PiPittsburgh, functions as an antithrombin (a related serpin), due to a mutation (Met358Arg). One person with this mutation has been reported to have died of a bleeding diathesis.

A liver biopsy will show abundant PAS-positive globules within periportal hepatocytes.

Patients with rheumatoid arthritis (RA) have been found to make autoantibodies toward the carbamylated form of A1AT in the synovial fluid. This suggests that A1AT may play an anti-inflammatory or tissue-protecting role outside the lungs. These antibodies are associated with a more severe disease course, can be observed years before disease onset, and may predict the development of RA in arthralgia patients. Consequently, carbamylated A1AT is currently being developed as an antigenic biomarker for RA.

Explanation:

https://en.wikipedia.org/wiki/Alpha-1_antitrypsin

https://www.creativebiomart.net/therapeutic-proteins/hematopathy/

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