An eGFP-expressing subpopulation of growth hormone secretagogue receptor cells are distinct from kisspeptin, tyrosine hydroxylase, and RFamide-related peptide neurons in mice.

An eGFP-expressing subpopulation of growth hormone secretagogue receptor cells are distinct from kisspeptin, tyrosine hydroxylase, and RFamide-related peptide neurons in mice.
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在小鼠中,表达EGFP的表达生长激素分泌受体细胞的亚群不同,与Kisspeptin,酪氨酸羟化酶和与RFAMIDE相关的肽神经元不同。

DOI:
10.1016/j.peptides.2013.06.012
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发表时间:
2013-09
期刊:
影响因子:
3
通讯作者:
Andrews ZB
Andrews ZB
中科院分区:
医学3区
文献类型:
--
作者:
Smith JT;Reichenbach A;Lemus M;Mani BK;Zigman JM;Andrews ZB

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Ghrelin作用于大脑中的生长激素促分泌素受体(GHSR)以引起生理功能的变化。它与食欲和新陈代谢的神经控制有关,但中枢ghrelin也影响生育能力。大鼠中枢ghrelin注射抑制促黄体生成激素(LH)浓度和脉冲频率。虽然生长激素释放肽抑制LH和调节kisspeptin mRNA在前腹侧脑室周围/脑室周围核(AVPV/Pen),有没有神经解剖学证据GHSR神经回路kisspeptin神经元。在这项研究中,我们首先确定GHSR和GnRH神经元的共表达使用GHSR-eGFP报告小鼠系。使用双标记免疫组织化学,我们没有看到共表达。AVPV/PeN中存在表达GHSR-eGFP的细胞,其中90%以上表达雌激素受体α(ERα)。尽管如此,我们没有观察到GHSR-eGFP/kisspeptin共表达神经元在AVPV/PeN的证据。为了进一步检查AVPV/PeN中GHSR-eGFP细胞的表型,我们确定了与酪氨酸羟化酶(TH)的共表达,并且显示在AVPV/PeN中几乎没有共表达(<2%)。我们还观察到下丘脑背内侧核中没有GHSR-eGFP和RFamide相关肽-3(RFRP 3)神经元的共表达。重要的是,我们观察到AVPV中大约一半的GHSR-eGFP细胞共表达Ghsr mRNA(通过原位杂交确定),因此这些数据应相应地解释。虽然ghrelin影响下丘脑生殖轴,但我们使用GHSR-eGFP报告基因的数据表明ghrelin调节表达ERα的神经元,但不直接作用于GnRH、kisspeptin、TH或RFRP 3神经元,因为观察到很少或没有GHSR-eGFP共表达。
Ghrelin acts on the growth hormone secretagogue receptor (GHSR) in the brain to elicit changes in physiological functions. It is associated with the neural control of appetite and metabolism, however central ghrelin also affects fertility. Central ghrelin injection in rats suppresses luteinizing hormone (LH) concentrations and pulse frequency. Although ghrelin suppresses LH and regulates kisspeptin mRNA in the anteroventral periventricular/periventricular nucleus (AVPV/PeN), there is no neuroanatomical evidence linking GHSR neural circuits to kisspeptin neurons. In this study, we first determined coexpression of GHSR and GnRH neurons using a GHSR-eGFP reporter mouse line. Using dual-label immunohistochemistry, we saw no coexpression. GHSR-eGFP expressing cells were present in the AVPV/PeN and over 90% of these expressed estrogen receptor-α (ERα). Despite this, we observed no evidence of GHSR-eGFP/kisspeptin coexpressing neurons in the AVPV/PeN. To further examine the phenotype of GHSR-eGFP cells in the AVPV/PeN, we determined coexpression with tyrosine hydroxylase (TH) and showed virtually no coexpression in the AVPV/PeN (<2%). We also observed no coexpression of GHSR-eGFP and RFamide-related peptide-3 (RFRP3) neurons in the dorsomedial hypothalamic nucleus. Importantly, we observed that approximately half of the GHSR-eGFP cells in the AVPV coexpressed Ghsr mRNA (as determined by in situ hybridization) so these data should be interpreted accordingly. Although ghrelin influences the hypothalamic reproductive axis, our data using a GHSR-eGFP reporter suggests ghrelin regulates neurons expressing ERα but does not directly act on GnRH, kisspeptin, TH, or RFRP3 neurons, as little or no GHSR-eGFP coexpression was observed.
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