Absent Progesterone Signaling in Kisspeptin Neurons Disrupts the LH Surge and Impairs Fertility in Female Mice

被引:82
作者
Stephens, Shannon B. Z. [1 ]
Tolson, Kristen P. [1 ]
Rouse, Melvin L., Jr. [1 ]
Poling, Matthew C. [1 ]
Hashimoto-Partyka, Minako K. [2 ]
Mellon, Pamela L. [1 ]
Kauffman, Alexander S. [1 ]
机构
[1] Univ Calif San Diego, Dept Reprod Med, La Jolla, CA 92093 USA
[2] Univ Calif Los Angeles, Dept Mol Cellular & Dev Biol, Los Angeles, CA 90095 USA
基金
美国国家科学基金会; 美国国家卫生研究院;
关键词
ESTROGEN POSITIVE FEEDBACK; LUTEINIZING-HORMONE SURGE; KISS1; GENE-EXPRESSION; SEXUAL-DIFFERENTIATION; GNRH NEURONS; RECEPTOR; BRAIN; ACTIVATION; MOUSE; ESTRADIOL;
D O I
10.1210/en.2015-1300
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Kisspeptin, encoded by Kiss1, stimulates GnRH neurons to govern reproduction. In rodents, estrogen-sensitive kisspeptin neurons in the anterior ventral periventricular nucleus and neighboring periventricular nucleus are thought to mediate sex steroid-induced positive feedback induction of the preovulatory LH surge. These kisspeptin neurons coexpress estrogen and progesterone receptors and display enhanced neuronal activation during the LH surge. However, although estrogen regulation of kisspeptin neurons has been well studied, the role of progesterone signaling in regulating kisspeptin neurons is unknown. Here we tested whether progesterone action specifically in kisspeptin cells is essential for proper LH surge and fertility. We used Cre-lox technology to generate transgenic mice lacking progesterone receptors exclusively in kisspeptin cells (termed KissPRKOs). Male KissPRKOs displayed normal fertility and gonadotropin levels. In stark contrast, female KissPRKOs displayed earlier puberty onset and significant impairments in fertility, evidenced by fewer births and substantially reduced litter size. KissPRKOs also had fewer ovarian corpora lutea, suggesting impaired ovulation. To ascertain whether this reflects a defect in the ability to generate sex steroid-induced LH surges, females were exposed to an estradiol-positive feedback paradigm. Unlike control females, which displayed robust LH surges, KissPRKO females did not generate notable LH surges and expressed significantly blunted cfos induction in anterior ventral periventricular nucleus kisspeptin neurons, indicating that progesterone receptor signaling in kisspeptin neurons is required for normal kisspeptin neuronal activation and LH surges during positive feedback. Our novel findings demonstrate that progesterone signaling specifically in kisspeptin cells is essential for the positive feedback induction of normal LH surges, ovulation, and normal fertility in females.
引用
收藏
页码:3091 / 3097
页数:7
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