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Amyloid, the aggregation, or clumping, of proteins, is resistant to degradation by the body. Amyloids are mostly fibrils, while also containing a P component, apolipoprotein, collagen, fibronectin, and laminin. [2] The P component, a pentameric protein, stabilizes the fibrils of the amyloid, which reduces their clearance from the body. [1]
To date, 37 human proteins have been found to form amyloid in pathology and be associated with well-defined diseases. [2] The International Society of Amyloidosis classifies amyloid fibrils and their associated diseases based upon associated proteins (for example ATTR is the group of diseases and associated fibrils formed by TTR). [3]
Amyloid light-chain (AL) amyloidosis, also known as primary amyloidosis, is the most common form of systemic amyloidosis. [1] The disease is caused when a person's antibody -producing cells do not function properly and produce abnormal protein fibers made of components of antibodies called light chains .
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Amyloid light chains deposition in shoulder joint causes enlarged shoulders, also known as "shoulder pad sign". [18] Amyloid light chain depositions can also cause bilateral symmetric polyarthritis. [18] The deposition of amyloid proteins in the bone marrow without causing plasma cell dyscrasias is called amyloidoma. It is commonly found in ...
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Due to this resistance to degradation, when amyloid fibrils accumulate in the heart's walls, specifically the left ventricle, rigidity prevents the heart from properly relaxing and refilling with blood: this is called diastolic dysfunction which can ultimately lead to heart failure. [2]