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• W2024654139 abstract "Sex differences in Parkinson's disease (PD) have been reported in humans and rodent models, with a higher incidence in men and increased severity in male rodents. The current study examined sex differences and the effects of gonadal steroid hormones in the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-lesioned mouse model of PD. Male (n=51) and female (n=50) mice were gonadectomized and received physiologic replacement with testosterone or estrogen (Experiment 1), or no hormones (Experiment 2). Two weeks later, mice received either MPTP (10 mg/kg per day for 5 days) or saline. Higher doses killed female mice. Mice were tested one week after MPTP for motor performance using rotarod, pole and gait tests. In hormone-treated mice, males significantly outperformed females in all three tests (p<0.05). Compared with females, males had a greater overall rotarod performance (ORP: 1317.1+/-98.3 vs. 988.1+/-95.6), descended a pole faster (7.1+/-0.6 vs. 9.6+/-0.7s), and had longer stride lengths (hindlimb 7.3+/-0.1 vs. 6.8+/-0.1cm). By contrast, ovariectomized female mice receiving saline outperformed castrated males on the rotarod (1296.6+/-83.3 vs. 811.2+/-113.7, p<0.05) and descended a pole faster (9.7+/-2.0 vs. 15.6+/-1.9s, p<0.05). MPTP significantly impaired ORP (p<0.05) in hormone-treated males (703.7+/-65.5) and females (432.8+/-88.6, p<0.05). After MPTP, stride length was selectively decreased in males (hindlimb 6.6+/-0.1 cm, p<0.05), and pole test performance was unimpaired in either sex. After gonadectomy, MPTP did not decrease motor performance in males (p>0.05) but significantly reduced ORP in females (975.9+/-110.3 vs. saline females, p<0.05). Our results show that small, chronic doses of MPTP produce subtle, sexually-dimorphic impairments in motor performance, but without a loss of tyrosine hydroxylase-positive neurons in the substantia nigra. In gonadectomized mice, this sex difference is reversed." @default.
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• W2024654139 date "2010-06-01" @default.
• W2024654139 modified "2023-09-27" @default.
• W2024654139 title "Sex differences in motor behavior in the MPTP mouse model of Parkinson's disease" @default.
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• W2024654139 doi "https://doi.org/10.1016/j.pbb.2010.03.009" @default.
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