Islet Microvasculature Alterations With Loss of Beta-cells in Patients With Type 1 Diabetes

Overview

Journal J Histochem Cytochem

Publisher Sage Publications

Specialty Biochemistry

Date 2018 May 18

PMID 29771178

Citations 27

Authors

Joseph S Canzano

Lith H Nasif

Elizabeth A Butterworth

Dongtao A Fu

Mark A Atkinson

Martha Campbell-Thompson

Affiliations

Soon will be listed here.

Abstract

Islet microvasculature provides key architectural and functional roles, yet the morphological features of islets from patients with type 1 diabetes are poorly defined. We examined islet and exocrine microvasculature networks by multiplex immunofluorescence imaging of pancreases from organ donors with and without type 1 diabetes (=17 and =16, respectively) and determined vessel diameter, density, and area. We also analyzed these variables in insulin-positive and insulin-negative islets of 7 type 1 diabetes donors. Control islet vessel diameter was significantly larger (7.6 ± 1.1 μm) compared with vessels in diabetic islets (6.2 ± 0.8 μm; <0.001). Control islet vessel density (number/islet) was significantly lower (5.3 ± 0.6) versus diabetic islets (9.3 ± 0.2; <0.001). Exocrine vessel variables were not significantly different between groups. Islets with residual beta-cells were comparable to control islets for both vessel diameter and density and were significantly different from insulin-negative islets within diabetic donors (<0.05). Islet smooth muscle actin area had a significant positive correlation with age in both groups (<0.05), which could negatively impact islet transplantation efficiency from older donors. These data underscore the critical relationship of islet beta-cells and islet vessel morphology in type 1 diabetes. These studies provide new knowledge of the islet microvasculature in diabetes and aging.

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