COMPOSITION OF AMYLOID
Amyloidosis
is a group of diseases characterized by the deposition of an extracellular
protein that has specific properties.
·
Individual molecular subunits form β-pleated sheets. Amorphous eosinophilic extracellular
deposits of amyloid are seen on the H&E stain. These deposits stain red
with the Congo red stain, and apple green birefringence of the amy-loid is seen
on the Congo red stain under polarized light.
·
The fibrillary protein of amyloid
varies with each disease. Also present in amy-loid are serum amyloid P (SAP)
and glycosaminoglycans (heparan sulfate).
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