Estradiol and dehydroepiandrosterone potentiate levodopa-induced locomotor activity in 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine monkeys

被引:15
作者
Bélanger, N
Grégoire, L
Bédard, PJ
Di Paolo, T
机构
[1] Univ Laval, Mol Endocrinol & Oncol Res Ctr, Med Ctr, CHUL, Quebec City, PQ G1V 4G2, Canada
[2] Univ Laval, Fac Pharm, Quebec City, PQ, Canada
[3] Univ Laval, Neurosci Res Unit, Med Ctr, CHUL, Quebec City, PQ G1V 4G2, Canada
[4] Univ Laval, Dept Med, Quebec City, PQ G1K 7P4, Canada
基金
加拿大健康研究院;
关键词
estradiol; dehydroepiandrosterone; 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine; monkeys; Parkinson disease; levodopa; circling;
D O I
10.1385/ENDO:21:1:97
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Six monkeys were rendered hemiparikinsonian with a unilateral injection of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine. These monkeys displayed ipsilateral circling under basal conditions, and after dopaminergic stimulation with levodopa they decreased their ipsilateral circling and started turning to the contralateral side of their lesion. The effect of 17beta-estradiol and dehydroepiandrosterone (DHEA) was investigated in these animals. 17beta-Estradiol (0.1 mg/kg) added to a threshold dose of levodopa significantly potentiated contralateral circling (mean/30 min) compared to saline or threshold levodopa treatment whereas the duration of circling remained unchanged. DHEA (1-15 mg/kg) alone induced contralateral circling, compared to saline treatment, for 90 min. In addition, DHEA (11 -15 mg/kg) potentiated the contralateral circling (mean/30 min) induced by a threshold dose of levodopa and did not change the duration of levodopa circling. A maximal response was observed with 1 or 5 mg/kg of DHEA combined with levodopa depending on the monkey. No correlation was found between the dose for the maximal DHEA response and baseline circling or threshold dose of levodopa. These results suggest that 17beta-estradiol or DHEA is able to potentiate locomotor activity of hemiparkinsonian monkeys. The DHEA doses investigated are similar to those presently used in humans. DHEA may be an alternative to 17beta-estradiol to modulate dopaminergic activity.
引用
收藏
页码:97 / 101
页数:5
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