Neurotensin inversely modulates maternal aggression.

Neurotensin inversely modulates maternal aggression.
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DOI:
10.1016/j.neuroscience.2008.11.045
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发表时间:
2009-02-18
期刊:
影响因子:
3.3
通讯作者:
Stevenson SA
Stevenson SA
中科院分区:
医学3区
文献类型:
--
作者:
Gammie SC;D'Anna KL;Gerstein H;Stevenson SA

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神经降压素(NT)是一种多功能的神经肽,参与镇痛、低温和精神分裂症。虽然NT是从参与社会行为的大脑区域释放并作用于该区域,但它与社会行为无关。我们先前选择了高母性攻击(母性防御),一个重要的社会行为,保护后代的小鼠,并发现显着较低的NT表达在中枢神经系统的高度保护性的女性。我们目前的研究直接测试了NT在母体防御中的作用。侧脑室(icv)注射NT在所有测试剂量(0.05、0.1、1.0和3.0 μg)下,在时间攻击性和攻击次数方面均显著损害防御。其他母体行为,包括幼仔取回,在NT注射(0.05 μg)后相对于媒介物没有改变,表明NT对防御作用的特异性。此外,icv注射NT受体1(NT 1)拮抗剂SR 48692(30 μg),在时间攻击性和攻击次数方面显着增加了母体攻击性。为了了解NT可能调节攻击性的位置,我们在注射0.1 μg NT或溶剂后检查了Fos。26个脑区中有13个表现出显著的Fos增加,包括表达NT 1的区域和先前与母体攻击有关的区域,如外侧隔、终纹床核、室旁核和中央杏仁核。总之,我们的研究结果表明,NT反向调节母体的侵略性,并提供了第一个直接的证据,降低NT信号可以是一种机制,为母体的侵略。据我们所知,这是第一个直接将NT与社会行为联系起来的研究。
Neurotensin (NT) is a versatile neuropeptide involved in analgesia, hypothermia, and schizophrenia. Although NT is released from and acts upon brain regions involved in social behaviors, it has not been linked to a social behavior. We previously selected mice for high maternal aggression (maternal defense), an important social behavior that protects offspring, and found significantly lower NT expression in the CNS of highly protective females. Our current study directly tested NT’s role in maternal defense. Intracerebroventricular (icv) injections of NT significantly impaired defense in terms of time aggressive and number of attacks at all doses tested (0.05, 0.1, 1.0, and 3.0 μg). Other maternal behaviors, including pup retrieval, were unaltered following NT injections (0.05 μg) relative to vehicle, suggesting specificity of NT action on defense. Further, icv injections of the NT receptor 1 (NT1) antagonist, SR 48692 (30 μg), significantly elevated maternal aggression in terms of time aggressive and attack number. To understand where NT may regulate aggression, we examined Fos following injection of either 0.1 μg NT or vehicle. 13 of 26 brain regions examined exhibited significant Fos increases with NT, including regions expressing NT1 and previously implicated in maternal aggression, such as lateral septum, bed nucleus of stria terminalis, paraventricular nucleus, and central amygdala. Together, our results indicate that NT inversely regulates maternal aggression and provide the first direct evidence that lowering of NT signaling can be a mechanism for maternal aggression. To our knowledge, this is the first study to directly link NT to a social behavior.
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