The effects of hormone replacement therapy on hypothalamic neuropeptide gene expression in a primate model of menopause

被引:82
作者
Abel, TW
Voytko, ML
Rance, NE [1 ]
机构
[1] Univ Arizona, Coll Med, Dept Pathol, Tucson, AZ 85724 USA
[2] Univ Arizona, Coll Med, Dept Cell Biol & Anat, Tucson, AZ 85724 USA
[3] Univ Arizona, Coll Med, Dept Neurol, Tucson, AZ 85724 USA
[4] Wake Forest Univ, Sch Med, Dept Comparat Med, Winston Salem, NC 27157 USA
关键词
D O I
10.1210/jc.84.6.2111
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Menopause is associated with increased neurokinin B (NKB) gene expression and decreased proopiomelanocortin (POMC) gene expression in the human hypothalamus. In the present study, young, ovariectomized cynomolgus monkeys were used in a model of menopause to examine the effects of hormone replacement therapy (HRT) on hypothalamic neuropeptide gene expression. A secondary goal was to determine whether HRT produces signs of estrogen toxicity in the primate hypothalamus by examining POMC neurons and microglial cells. In situ hybridization was performed using synthetic, radiolabeled, 48-base oligonucleotide probes. alpha-napthyl butyrate esterase histochemistry was used to visualize microglial cells. Both estrogen and estrogen plus progesterone treatments produced a marked suppression of the number of infundibular neurons expressing NKB gene transcripts. In contrast, HRT had no effect on the POMC system of neurons or the number of microglial cells in the infundibular nucleus. These results provide strong support for the hypothesis that the increased NKB gene expression in the hypothalamus of postmenopausal women is secondary to estrogen withdrawal. Conversely, these data suggest that the dramatic decline in the numbers of neurons expressing POMC gene transcripts in older women is caused by factors other than ovarian failure. Finally, we found no evidence that HRT, in doses designed to mimic currently prescribed regimens, produces signs of estrogen toxicity in the primate infundibular nucleus.
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页码:2111 / 2118
页数:8
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