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Related Experiment Video

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Scaffold-supported Transplantation of Islets in the Epididymal Fat Pad of Diabetic Mice
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Cell rearrangement in transplanted human islets.

Vanessa Lavallard1, Mathieu Armanet2, Géraldine Parnaud2

  • 1*Cell Isolation and Transplantation Center, Department of Surgery, Geneva University Hospitals and University of Geneva, Geneva, Switzerland; Cell Therapy Unit, Hôpital Saint Louis, Assistance Publique-Hôpitaux de Paris, and University Paris 7, Paris, France; and Institut National de la Santé et de la Recherche Médicale, Unité Mixte de Recherche Scientifique 1138, Centre de Recherches des Cordeliers, Paris, France vanessa.lavallard@unige.ch.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|November 5, 2015
PubMed
Summary
This summary is machine-generated.

Human pancreatic islet architecture relies on extracellular matrix, not vascularization, for proper cell arrangement. Transplanted pseudoislets mimic native islet structure in vivo, revealing key organizational cues.

Keywords:
architectureextracellular matrixvascularization

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Area of Science:

  • Endocrinology
  • Cell Biology
  • Tissue Engineering

Background:

  • Human pancreatic islets feature a specific architecture with central beta (β) cells and peripheral alpha (α) cells, surrounded by vasculature.
  • Understanding the mechanisms governing this unique islet organization is crucial for regenerative medicine and diabetes research.

Purpose of the Study:

  • To investigate the factors responsible for the characteristic cell arrangement in pancreatic islets.
  • To compare the organization of reaggregated islet cells (pseudoislets) formed in culture versus those formed after transplantation in vivo.

Main Methods:

  • Isolation of human islet cells and their reaggregation into pseudoislets.
  • Immunohistological analysis of pseudoislets cultured in vitro and transplanted into mice.
  • Assessment of revascularization and extracellular matrix distribution around transplanted pseudoislets.
  • Inhibition of vascularization using anti-VEGF antibodies and prevention of extracellular matrix contact via alginate encapsulation.

Main Results:

  • Pseudoislets formed in culture showed disorganized cell arrangement.
  • Transplanted pseudoislets exhibited an organization similar to native pancreatic islet subunits.
  • Revascularization and extracellular matrix distribution in transplanted pseudoislets mirrored native islets.
  • Pseudoislet organization was maintained even without vascularization but was disrupted when extracellular matrix contact was prevented.

Conclusions:

  • The maintenance of pancreatic islet cell arrangement is primarily dependent on in vivo extracellular matrix interactions.
  • Vascularization is not essential for achieving the native-like cellular organization within pancreatic islets.
  • These findings highlight the critical role of the microenvironment, particularly the extracellular matrix, in governing islet architecture.