Islet amyloid polypeptide (amylin) and insulin are differentially expressed in chronic diabetes induced by streptozotocin in rats.

Abstract:

:Islet amyloid polypeptide (IAPP) is overexpressed relative to insulin under several experimental conditions relevant to diabetes mellitus, including the immediate phase (7 days) following induction of streptozotocin diabetes. In the present study, IAPP and insulin gene expression were examined in chronic streptozotocin diabetes (3 weeks) in rats. Quantitative in situ hybridization, determining grain areas and optical densities of mRNA labelling, revealed that IAPP and insulin expression were reduced at the islet level at both low and high streptozotocin doses, partly due to reduced beta-cell mass. In contrast, the cellular levels of IAPP mRNA were either increased or unaffected at the low and high streptozotocin doses, respectively, whereas those of insulin mRNA were unaffected or reduced. When dexamethasone was administered to rats given the low streptozotocin dose, IAPP expression was increased, whereas that of insulin was markedly reduced. Immunocytochemistry revealed that IAPP predominantly occurred in insulin cells and to a lesser extent in somatostatin cells at all treatments examined. Our findings demonstrate that IAPP and insulin gene expression are differentially regulated; the over-expression of IAPP relative to insulin is augmented when the beta-cell insult is aggravated, in our experiments represented by massive beta-cell destruction (high streptozotocin dose) or a combination of moderate beta-cell damage and peripheral insulin resistance (low streptozotocin dose and dexamethasone). An over-expression of IAPP relative to insulin may therefore be involved in diabetes pathogenesis, contributing to its metabolic perturbations, possibly through the capacity of IAPP to restrain insulin release and action and to form islet amyloid.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Mulder H,Ahrén B,Sundler F

doi

10.1007/BF00418536

subject

Has Abstract

pub_date

1996-06-01 00:00:00

pages

649-57

issue

6

eissn

0012-186X

issn

1432-0428

journal_volume

39

pub_type

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