Faculty Research 1970 - 1979

Exocrine pancreatic insufficiency syndrome in CBA/J mice. Ultrastructural study.

Document Type

Article

Publication Date

1977

Keywords

Cytoplasmic-Granules: ul, Endoplasmic-Reticulum: ul, Enzyme-Precursors: me, Mice, Mice-Inbred-CBA, Pancreas: ul, Pancreatic-Diseases: pa, ve, Rodent-Diseases: mi, pa, SUPPORT-U-S-GOVT-P-H-S, Trypsin: ph, Virus-Diseases: co

First Page

17

Last Page

30

JAX Location

41,848

JAX Source

Am-J-Pathol. 1977 Jan; 86(1):17-30.

Abstract

The pathogenesis of a spontaneously occurring exocrine pancreatic insufficiency (EPI) syndrome in CBA/J mice was studied at the ultrastructural level. Initial cytologic manifestations of this syndrome are seen as a progressive digestion of the zymogen granules, beginning at the periphery and proceeding toward the granule interior. Granule membrane breakdown, fusion of neighboring granules, and a release of zymogen contents into the cytoplasm are frequently observed in later stages; in some cases the entire granule contents appear digested before membrane breakdown is observed. In either case, pathologic changes are subsequently observed in mitochondria and rough endoplasmic reticulum. Remnants of lysed cells are then engulfed by invading macrophages, and infiltration by fat cells is observed. Secretory ducts and islets of Langerhans show no pathologic changes even after total autolysis of the exocrine pancreas. Morphologic evidence showing zymogen granule destabilization, coupled with biochemical evidence presented in an accompanying paper, indicate that intracellular autodigestion is the mechanism of exocrine cell death.

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