Cell rearrangement in transplanted human islets

The major feature of the human pancreatic islet architecture is the organization of endocrine cells into clusters comprising central β cells and peripheral α cells surrounded by vasculature. To have an insight into the mechanisms that govern this unique islet architecture, islet cells were isolated,...

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Bibliographic Details
Published in:The FASEB journal 2016-02, Vol.30 (2), p.748-760
Main Authors: Lavallard, Vanessa, Armanet, Mathieu, Parnaud, Geraldine, Meyer, Jérémy, Barbieux, Charlotte, Montanari, Elisa, Meier, Raphaël, Morel, Philippe, Berney, Thierry, Bosco, Domenico
Format: Article
Language:English
Subjects:
Animals
architecture
extracellular matrix
Extracellular Matrix - metabolism
Extracellular Matrix - pathology
Glucagon-Secreting Cells - metabolism
Glucagon-Secreting Cells - pathology
Heterografts
Humans
Insulin-Secreting Cells - metabolism
Insulin-Secreting Cells - pathology
Islets of Langerhans Transplantation
Male
Mice
Mice, SCID
vascularization
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Summary:The major feature of the human pancreatic islet architecture is the organization of endocrine cells into clusters comprising central β cells and peripheral α cells surrounded by vasculature. To have an insight into the mechanisms that govern this unique islet architecture, islet cells were isolated, and reaggregation of α and β cells into islet‐like structures (pseudoislets) after culture or transplantation into mice was studied by immunohistology. The pseudoislets formed in culture displayed an unusual cell arrangement, contrasting with the transplanted pseudoislets, which exhibited a cell arrangement similar to that observed in native pancreatic islet subunits. The pattern of revascularization and the distribution of extracellular matrix around transplanted pseudoislets were alike to those observed in native pancreatic islets. This organization of transplanted pseudoislets occurred also when revascularization was abolished by treating mice with an anti‐VEGF antibody, but not when contact with extracellular matrix was prevented by encapsulation of pseudoislets within alginate hydrogel. These results indicate that the maintenance of islet cell arrangement is dependent on in vivo features such as extracellular matrix but independent of vascularization.—Lavallard, V., Armanet, M., Parnaud, G., Meyer, J., Barbieux, C., Montanari, E., Meier, R., Morel, P., Berney, T., Bosco, D. Cell rearrangement in transplanted human islets. FASEB J. 30, 748–760 (2016). www.fasebj.org
ISSN:0892-6638
1530-6860
DOI:10.1096/fj.15-273805