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Experimental stroke in the female diabetic, db/db, mouse
S J Vannucci1, L B Willing, S Goto
1Department of Pediatrics, Milton S. Hershey Medical Center, Pennsylvania State University College of Medicine, Hershey 17033, USA.
Summary
Female diabetic mice show greater resistance to hypoxic-ischemic brain damage than males, despite higher hyperglycemia and acidosis. This suggests a unique pathophysiology in the female diabetic brain.
Area of Science:
- Neuroscience
- Endocrinology
- Pathophysiology
Background:
- Diabetic hyperglycemia exacerbates brain damage from cerebral ischemia.
- Gender differences in ischemic tolerance are known but unstudied in diabetes.
Purpose of the Study:
- To investigate the combined effects of diabetes and gender on hypoxic-ischemic (HI) brain damage.
- To analyze mortality, infarct volume, and tissue damage in diabetic and control mice of both genders.
Main Methods:
- Utilized a mouse model of Type II diabetes (db/db) subjected to unilateral carotid artery ligation and systemic hypoxia.
- Assessed mortality, infarct volume, and tissue damage via light microscopy.
- Measured regional cerebral blood flow (CBF) and cerebral energy reserves.
Main Results:
- Both gender and diabetes significantly impacted HI mortality and brain damage.
- Female mice exhibited greater resistance to HI damage than males, with severity ranking: male diabetics > female diabetics > male controls > female controls.
- Cerebral blood flow and energy reserve depletion were similar across groups, despite female diabetics having higher hyperglycemia and prolonged acidosis.
Conclusions:
- The study reveals a unique pathophysiology of hypoxia-ischemia in the female diabetic brain.
- Gender plays a crucial role in modulating brain injury severity in diabetes.