Amyloid formation in insulinoma

Local amyloid depositions were investigated with electron microscopy in a functioning beta cell adenoma of the pancreas. Beta granule-containing neoplastic cells adjoining small amyloid depositions were shown to have cellular invaginations containing radiating amyloid bundles, indicating the neoplas...

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Bibliographic Details
Published inArchives of pathology & laboratory medicine (1976) Vol. 102; no. 5; pp. 227 - 232
Main Authors An, T, Kaye, G I
Format Journal Article
LanguageEnglish
Published United States 01.05.1978
Subjects
Adenoma, Islet Cell - metabolism
Adenoma, Islet Cell - ultrastructure
Amyloid - biosynthesis
Amyloidosis - metabolism
Amyloidosis - pathology
Cell Nucleus - ultrastructure
Cytoplasmic Granules - ultrastructure
Female
Humans
Middle Aged
Pancreas - ultrastructure
Pancreatic Neoplasms - metabolism
Pancreatic Neoplasms - ultrastructure
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Summary:Local amyloid depositions were investigated with electron microscopy in a functioning beta cell adenoma of the pancreas. Beta granule-containing neoplastic cells adjoining small amyloid depositions were shown to have cellular invaginations containing radiating amyloid bundles, indicating the neoplastic cells were involved in the formation of amyloid. Seen in the larger mayloid depositions were attenuated, thin, cellular processes of the neoplastic cells, separating the amyloid stroma into globules. The globular separations of the amyloid correlated well with the light-microscopic globular appearance of amyloid stroma. Possible mechanisms are discussed for the amyloid deposition of insulinoma with relation to amyloidogenesis of other types of amyloidosis.
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ISSN:0003-9985