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Published in: Diabetologia 7/2008

01-07-2008 | Article

Blood vessels of human islets of Langerhans are surrounded by a double basement membrane

Authors: I. Virtanen, M. Banerjee, J. Palgi, O. Korsgren, A. Lukinius, L.-E. Thornell, Y. Kikkawa, K. Sekiguchi, M. Hukkanen, Y. T. Konttinen, T. Otonkoski

Published in: Diabetologia | Issue 7/2008

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Abstract

Aims/hypothesis

Based on mouse study findings, pancreatic islet cells are supposed to lack basement membrane (BM) and interact directly with vascular endothelial BM. Until now, the BM composition of human islets has remained elusive.

Methods

Immunohistochemistry with specific monoclonal and polyclonal antibodies as well as electron microscopy were used to study BM organisation and composition in human adult islets. Isolated islet cells and function-blocking monoclonal antibodies and recombinant soluble Lutheran peptide were further used to study islet cell adhesion to laminin (Lm)-511. Short-term cultures of islets were used to study Lutheran and integrin distribution.

Results

Immunohistochemistry revealed a unique organisation for human Lm-511/521 as a peri-islet BM, which co-invaginated into islets with vessels, forming an outer endocrine BM of the intra-islet vascular channels, and was distinct from the vascular BM that additionally contained Lm-411/421. These findings were verified by electron microscopy. Lutheran glycoprotein, a receptor for the Lm α5 chain, was found prominently on endocrine cells, as identified by immunohistochemistry and RT-PCR, whereas α3 and β1 integrins were more diffusely distributed. High Lutheran content was also found on endocrine cell membranes in short-term culture of human islets. The adhesion of dispersed beta cells to Lm-511 was inhibited equally effectively by antibodies to integrin and α3 and β1 subunits, and by soluble Lutheran peptide.

Conclusions/interpretation

The present results disclose a hitherto unrecognised BM organisation and adhesion mechanisms in human pancreatic islets as distinct from mouse islets.
Appendix
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Metadata
Title
Blood vessels of human islets of Langerhans are surrounded by a double basement membrane
Authors
I. Virtanen
M. Banerjee
J. Palgi
O. Korsgren
A. Lukinius
L.-E. Thornell
Y. Kikkawa
K. Sekiguchi
M. Hukkanen
Y. T. Konttinen
T. Otonkoski
Publication date
01-07-2008
Publisher
Springer-Verlag
Published in
Diabetologia / Issue 7/2008
Print ISSN: 0012-186X
Electronic ISSN: 1432-0428
DOI
https://doi.org/10.1007/s00125-008-0997-9

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