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Diabetes, Vol 45, Issue 9 1161-1167, Copyright © 1996 by American Diabetes Association
Vulnerability of islets in the immediate posttransplantation period. Dynamic changes in structure and function
AM Davalli, L Scaglia, DH Zangen, J Hollister, S Bonner-Weir and GC Weir
E.P. Joslin Laboratories, Joslin Diabetes Center, Boston, MA 02215, USA.
To learn more about islet vulnerability in the immediate posttransplant
period, 400 syngeneic islets were transplanted under the kidney capsule of
B6AF1 mice. Three groups of recipients were used: normal mice (normal),
streptozotocin (STZ)-diabetic (diabetic), and STZ-diabetic kept hypo- or
normoglycemic with insulin pellets (diabetic-normalized). Normoglycemia was
achieved in all three groups 14 days after transplantation; however, in the
diabetic and diabetic-normalized groups, blood glucose levels throughout
the posttransplantation period were respectively higher and lower than in
the normal group. Grafts were harvested 1, 3, 7, and 14 days after
transplantation and analyzed for morphology, beta-cell death, beta-cell
mass, insulin content, and insulin mRNA expression. In all groups,
substantial damage in islet grafts was found on days 1 and 3 with apoptotic
nuclei and necrotic cores; on day 3, beta-cell death was significantly
higher in the diabetic group than in the other groups. Tissue remodelling
occurred in all groups with stable graft appearance on day 14; the actual
beta-cell mass of the grafts was lowest in the diabetic group. Graft
insulin content decreased in all groups on day 1 and fell even further on
days 3 and 7. Insulin mRNA levels of grafts retrieved from both the
diabetic and diabetic-normalized group were lower than those from the
normal group already by day 1 and remained lower on day 14. In conclusion,
the first few days of islet transplantation, even under the most
advantageous circumstances of excellent metabolic control, are
characterized by dynamic changes, with substantial islet cell dysfunction
and death followed by tissue remodelling and then stable engraftment.

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In vitro and in vivo evaluation of insulin-producing beta TC6-F7 cells in microcapsules
Am J Physiol Cell Physiol,
May 1, 1998;
274(5):
C1356 - C1362.
[Abstract]
[Full Text]
[PDF]
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