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Significance of the peri-insular extracellular matrix for islet isolation from the pancreas of rat, dog, pig, and man.
van Deijnen, J H; Hulstaert, C E; Wolters, G H; van Schilfgaarde, R.
Afiliação
  • van Deijnen JH; Department of Surgery, University of Groningen, The Netherlands.
Cell Tissue Res ; 267(1): 139-46, 1992 Jan.
Article em En | MEDLINE | ID: mdl-1735110
ABSTRACT
The presence and distribution in the peri-insular region of extracellular matrix, and in particular basement membrane, was investigated in a comparative study comprising pancreata of rat, dog, pig, and man. Basement membrane markers, collagen type-IV and laminin, were determined immunohistochemically. Additional information pertaining to the structural relationships between endocrine and exocrine pancreas, in particular cell-to-cell and cell-to-matrix contacts, was obtained by electron microscopy. In pig, very little peri-insular capsule is present, and the structural integration of the porcine islet in the exocrine pancreas almost exclusively depends on cell-to-cell adhesion. In the canine pancreas, the islets are almost completely encapsulated with very little direct exocrine-to-endocrine cell-to-cell contact. In rat and man, the situation is intermediate with a tendency towards predominance of cell-to-matrix adhesion. The intra-insular adhesion mechanisms depend largely on cell-to-cell adhesion in all four species. The ultrastructural results suggest that collagenase preparations employed in islet isolation procedures should be of high purity as to preserve the protease-sensitive intra-islet cell-to-cell adhesion. Under these conditions, however, the endocrine-to-exocrine cell-to-cell contacts will be conserved also, resulting in an exocrine-tissue contamination of the islets of Langerhans. Consequently, additional steps for the effective removal of exocrine tissue and the purification of islets are required.
Assuntos
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Transplante das Ilhotas Pancreáticas / Ilhotas Pancreáticas Limite: Adult / Animals / Female / Humans / Male Idioma: En Revista: Cell Tissue Res Ano de publicação: 1992 Tipo de documento: Article País de afiliação: Holanda
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Transplante das Ilhotas Pancreáticas / Ilhotas Pancreáticas Limite: Adult / Animals / Female / Humans / Male Idioma: En Revista: Cell Tissue Res Ano de publicação: 1992 Tipo de documento: Article País de afiliação: Holanda