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[Early induction of diabetes in NOD mice by streptozotocin]
Abstract:
To clarify whether the non-obese diabetes prone (NOD) mouse has an unusual pancreatic sensitivity to damage, mice were administered streptozotocin in high dose (direct beta cell toxic) or multiple low-dose (autoimmune-insulitis generating) regimen. NOD mice were found to be less sensitive to the diabetogenic effects of high-dose streptozotocin than C57BL/6 mice, but were exquisitely responsive to the multiple low dose regimen when compared to C57BL/6 or C3H/HeJ mice. These results suggest that the basic defect in NOD mice resides in the immune system and that the NOD mouse may be a useful model to investigate the relationships between environmental factors and intrinsic genetic predisposition to diabetes.
Insights
Non-obese diabetes prone (NOD) mice show reduced sensitivity to direct beta cell toxins but heightened responsiveness to autoimmune triggers. This indicates their diabetes predisposition stems from immune system defects, not pancreatic issues.
Area of Science:
- Immunology
- Endocrinology
- Genetics
Background:
- The non-obese diabetes prone (NOD) mouse is a model for autoimmune diabetes.
- Its pancreatic sensitivity to damage is not fully understood.
Purpose of the Study:
- To investigate the pancreatic sensitivity of NOD mice to beta cell toxins and autoimmune triggers.
- To elucidate the underlying defect in NOD mice.
Main Methods:
- Administration of high-dose streptozotocin (direct beta cell toxic) to NOD and C57BL/6 mice.
- Administration of multiple low-dose streptozotocin (autoimmune-insulitis generating) to NOD, C57BL/6, and C3H/HeJ mice.
Main Results:
- NOD mice exhibited less sensitivity to high-dose streptozotocin compared to C57BL/6 mice.
- NOD mice were highly responsive to multiple low-dose streptozotocin, unlike C57BL/6 or C3H/HeJ mice.
Conclusions:
- The primary defect in NOD mice lies within the immune system, not pancreatic beta cells.
- NOD mice are a valuable model for studying environmental factors and genetic predisposition in diabetes development.