Abstract
The present studies were undertaken to examine the effects of probucol on the protection against pancreatic beta-cell damage by multiple low-dose streptozotocin (STZ: 40 mg/kg, ip). The degree of hyperglycemia at 7, 14 and 17 days after STZ injection was attenuated by probucol. Serum immunoreactive insulin (IRI) levels were increased in the rats fed probucol containing diet at Day 14 and 17. Serum IRI levels after intraperitoneal injection of 2.0 g/kg glucose was reduced in STZ mice and the reduction of serum IRI levels was attenuated in the rats fed probucol, accompanied with a significant reduction of the degree of hyperglycemia after bolus of glucose. Probucol attenuated the reduction of pancreatic IRI content by STZ. The percentage of Thy 1.2-positive splenocytes was increased by STZ and probucol reduced the percentage of Thy 1.2-positive splenocytes, although there were no differences in the populations of splenocytes, positive with Lyt 2 or L3/T4. These data suggest that probucol has a protective action against pancreatic insulitis by multiple low-dose STZ administration.
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