MPTP Neurotoxicity and Testosterone Induce Dendritic Remodeling of Striatal Medium Spiny Neurons in the C57Bl/6 Mouse.

MPTP Neurotoxicity and Testosterone Induce Dendritic Remodeling of Striatal Medium Spiny Neurons in the C57Bl/6 Mouse.
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DOI:
10.4061/2011/138471
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发表时间:
2011
期刊:
Parkinson's disease
影响因子:
--
通讯作者:
Wood RI
Wood RI
中科院分区:
其他
文献类型:
--
作者:
Antzoulatos E;Jakowec MW;Petzinger GM;Wood RI

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黑质纹状体损伤在男性相对于女性增加。虽然雌激素在女性中具有神经保护作用,但对睾酮在男性中的潜在保护作用知之甚少。 我们确定了去势是否会增强1-甲基-4-苯基-1,2,3,6-四氢吡啶(MPTP)对神经元的损伤。注射MPTP(4 × 20 mg/kg)或生理盐水(n = 11-12/组)后1周处死去势或假去势小鼠。 对右侧纹状体进行酪氨酸羟化酶(TH)免疫染色。 左半球由高尔基考克斯染色,以量化背外侧纹状体的中型多刺神经元(MSN)中的神经元形态。 MPTP降低TH,但没有去势效应,也没有相互作用。 对于MSN树突形态,MPTP降低了最高分支顺序,并增加了第2级树突上的棘密度。去势雄性的第5级树突较短。 然而,性腺状态和MPTP之间没有相互作用。 因此,去势和MPTP施加不重叠的MSN形态与去势作用于远端树突和MPTP近端。
Nigrostriatal damage is increased in males relative to females. While estrogen is neuroprotective in females, less is known about potential protective effects of testosterone in males. We determined if castration enhances neuronal injury to 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP). Castrates or sham-castrated mice were sacrificed 1 week following injection of MPTP (4 × 20 mg/kg) or saline (n = 11-12/group). The right striatum was immunostained for tyrosine hydroxylase (TH). The left hemisphere was stained by Golgi Cox to quantify neuronal morphology in medium spiny neurons (MSNs) of the dorsolateral striatum. MPTP reduced TH, but there was no effect of castration and no interaction. For MSN dendritic morphology, MPTP decreased the highest branch order and increased spine density on 2nd-order dendrites. Castrated males had shorter 5th-order dendrites. However, there was no interaction between gonadal status and MPTP. Thus, castration and MPTP exert nonoverlapping effects on MSN morphology with castration acting on distal dendrites and MPTP acting proximally.
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