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The most useful stain in the diagnosis of amyloid is Congo red, which, combined with polarized light, makes the amyloid proteins appear apple-green on microscopy. Also, thioflavin T stain may be used. [22] A number of imaging techniques such as a Nuclear Medicine PYP scan, DPD scan or SAP scan are also in use. [23]
[2] [3] The term congophilic is sometimes used because the presence of the abnormal aggregations of amyloid can be demonstrated by microscopic examination of brain tissue after staining with Congo red. The amyloid material is only found in the brain and as such the disease is not related to other forms of amyloidosis. [4]
Amyloid shows up as homogeneous pink material in lamina propria and around blood vessels. 20× magnification. Amyloids are aggregates of proteins characterised by a fibrillar morphology of typically 7–13 nm in diameter, a β-sheet secondary structure (known as cross-β) and ability to be stained by particular dyes, such as Congo red. [1]
Example of amyloid deposits under Congo Red staining LECT2 Amyloidosis (ALECT2) is a form of amyloidosis caused by the LECT2 protein. It was found to be the third most common (~3% of total) cause of amyloidosis in a set of more than 4,000 individuals studied at the Mayo Clinic ; the first and second most common forms the disorder were AL ...
One such stain is Congo Red, which binds specifically to the amyloid deposit and can be characterized by various lighting methods. [7] Under polarized light, the amyloid deposits while show pathognomonic apple green birefringence, and under plain light the deposits will appear a light salmon pink color. [7] Familial amyloidosis symptoms are ...
Due to a color change from blue to red at pH 3.0–5.2, Congo red can be used as a pH indicator. Since this color change is an approximate inverse of that of litmus, it can be used with litmus paper in a simple parlor trick: add a drop or two of Congo red to both an acid solution and a base solution. Dipping red litmus paper in the red solution ...
Lattice corneal dystrophy type II. Black and white light micrograph showing deposits of amyloid in cornea. Congo red stain. Diagram depicting gelsolin and the amyloid protein derived from it because of mutations in codon. Lattice corneal dystrophy has three types: [3] type I: with no systemic association.
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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