Abstract:
AIMS/HYPOTHESIS:Diabetes is induced by multiple low doses of streptozotocin (MLD-STZ) in male mice of susceptible strains. In this model beta-cell injury and T-cell-mediated inflammatory reactions are induced. Probably, reactive oxygen species (ROS) participate in the destruction of beta cells. The effects of ROS can be counterbalanced by several antioxidant systems. One of these is metallothionein (MT), cytosolic proteins that are induced by zinc ions (Zn2+) and scavenge hydroxyl radicals (OH). The effect of Zn2+ on MLD-STZ-diabetes was studied. METHODS:We gave C57BL/6 and (C57BL/6 x SJL)F1 hybrid mice either MLD-STZ or in addition Zn2+-enriched drinking water. We analysed metallothionein ex vivo in pancreatic islets for protein and mRNA concentration for the isoforms 1 and 2. Pancreatic sections were examined by immunohistochemistry for metallothionein and histologically for insulitis. RESULTS:In both strains, Zn2+-enriched drinking water significantly up-regulated metallothionein and prevented MLD-STZ-diabetes and loss of beta-cell function. In the F1 hybrid mice a variant of MLD-STZ-diabetes was observed. These mice developed hyperglycaemia 10 weeks after the first injection of STZ (in contrast to 2 weeks observed in other mouse strains) and pronounced insulitis. The mRNA of the metallothionein isoforms 1 and 2 were constitutively expressed and slightly up-regulated by Zn2+-enriched drinking water. All islets cells stained for metallothionein. CONCLUSIONS/INTERPRETATIONS:Drinking water enriched with Zn2+ significantly up-regulated metallothionein production in pancreatic islets of mice and prevented diabetes induced with MLD-STZ.
journal_name
Diabetologiajournal_title
Diabetologiaauthors
Ohly P,Dohle C,Abel J,Seissler J,Gleichmann Hdoi
10.1007/s001250050009subject
Has Abstractpub_date
2000-08-01 00:00:00pages
1020-30issue
8eissn
0012-186Xissn
1432-0428journal_volume
43pub_type
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