Key result
Streptozotocin-induced diabetes reduces cerebral glucose metabolism across all brain regions, with greater reductions in females.
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The neuroimaging literature indicates that brain structure and function both deteriorate with diabetes, but information on sexual dimorphism in diabetes-related brain alterations is limited. This study aimed to ascertain whether brain metabolism is influenced by sex in an animal model of diabetes. Eleven rats (male, n = 5; female, n = 6) received a single intraperitoneal injection of 70 mg/kg streptozotocin (STZ) to develop diabetes. Another 11 rats (male, n = 5; female, n = 6) received the same amount of solvent through a single intraperitoneal injection. Longitudinal positron emission tomography scans were used to assess cerebral glucose metabolism before and 4 weeks after STZ or solvent administration. Before STZ or solvent injections, there was no evidence of sexual dimorphism in cerebral metabolism (p > 0.05). Compared with healthy control animals, rats with diabetes had significantly decreased brain metabolism in all brain regions (all p < 0.05). In addition, female diabetic rats exhibited further reduction in cerebral metabolism, relative to male diabetic rats (p < 0.05). The results of this study may provide some biological evidence, supporting the existence of a sexual dimorphism in diabetes-related complications.
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Wu et al. (2021) studied Experimental diabetes (animal model) (n=22). Streptozotocin (STZ) intraperitoneal injection vs. Solvent intraperitoneal injection was evaluated on Cerebral glucose metabolism measured via longitudinal positron emission tomography (PET) scans (p=<0.05). Streptozotocin-induced diabetes decreased cerebral glucose metabolism across all brain regions vs control (p<0.05), with greater reduction in female vs male diabetic rats (p<0.05).
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