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Journal of Clinical Endocrinology & Metabolism, Vol 80, 3196-3200, Copyright © 1995 by Endocrine Society
ARTICLES |
M Kuroda, T Oka, Y Oka, T Yamochi, K Ohtsubo, S Mori, T Watanabe, R Machinami and S Ohnishi
Department of Pathology, Faculty of Medicine, University of Tokyo, Japan.
Previously, we found that the islet of pancreas stained with a antibody against the vascular permeability factor (VPF; also known as vascular endothelial growth factor, VEGF) protein. To determine how common this reaction was and whether it was a specific reaction for the islet, we examined its expression and specific cellular localization. Two different antibodies directed against VPF/VEGF peptide revealed an intense reaction for beta-cells in the human islets of Langerhans, and several human beta-cell tumors (insulinomas), but no reaction, were detectable in the vascular endothelium. In the fetal pancreas (second and third trimesters), the VPF/VEGF peptide was detected in immature islets. Northern blot analysis of cell lines derived from rodent insulinomas revealed expression of VPF/VEGF messenger ribonucleic acid. Western blot analysis of conditioned medium from one of these cell lines showed the presence of the released VPF/VEGF protein. These findings indicate that beta-cells have a specific role other than endocrine function in the pancreas. VPF/VEGF in beta-cells may be involved in the maintenance and control of permeability within the islet capillary system.
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