Oklahoma Center for Neuroscience, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA.
J Pain. 2011 Apr;12(4):486-94. doi: 10.1016/j.jpain.2010.10.007. Epub 2010 Dec 17.
UNLABELLED: Females are disproportionately affected by irritable bowel syndrome (IBS) with menstrual cycle-dependent fluctuations in abdominal pain suggesting a role for ovarian hormones. IBS patients also exhibit greater activation of brain areas involved in pain affect such as the amygdala, yet the role of supraspinal processes in the effects of ovarian hormones on visceral pain is largely unexplored. The goal of the current study was to determine whether sex steroids act at the level of the amygdala to alter colonic pain sensitivity. Ovariectomized rats received implants on the amygdala of progesterone, estradiol, progesterone combined with estradiol, or cholesterol as a control to examine the involvement of the amygdala in ovarian hormone-mediated changes in visceral sensitivity. Visceral sensitivity was quantified as the number of abdominal contractions, a visceromotor response (VMR), in response to graded pressures of colorectal distension (CRD). Somatic sensitivity was also assessed by measuring the mechanical force required to elicit hindpaw withdrawal. Elevated levels of progesterone and/or estradiol on the amygdala heightened the responsiveness to CRD; in contrast, neither estradiol nor progesterone altered somatic sensation. Furthermore, administration of progesterone or estradiol to areas adjacent to the amygdala did not affect visceral sensitivity. Future studies will address the specific steroid receptors mediating the effects of progesterone and estradiol. PERSPECTIVE: To our knowledge, this study represents the first description of a specific brain site mediating the effects of ovarian steroids on visceral sensitivity. These data also suggest that an amygdala-dependent mechanism may be responsible, at least in part, for the exacerbation of visceral symptomatology in females.
未加标注:女性受肠易激综合征(IBS)的影响不成比例,腹部疼痛随月经周期波动,表明卵巢激素起作用。IBS 患者的大脑中与疼痛相关的区域(如杏仁核)也表现出更大的激活,但卵巢激素对内脏疼痛的影响的中枢过程的作用在很大程度上仍未得到探索。本研究的目的是确定甾体激素是否在杏仁核水平上作用,以改变结肠疼痛敏感性。去卵巢大鼠在杏仁核中接受孕激素、雌二醇、孕激素与雌二醇联合或胆固醇(作为对照)的植入,以检查杏仁核在卵巢激素介导的内脏敏感性变化中的作用。内脏敏感性通过对结肠直肠扩张(CRD)的分级压力的腹部收缩(VMR)的数量来量化。躯体敏感性也通过测量引起后足撤回所需的机械力来评估。杏仁核上高水平的孕激素和/或雌二醇增加了对 CRD 的反应性;相比之下,雌二醇和孕激素都不会改变躯体感觉。此外,将孕激素或雌二醇施用于杏仁核附近的区域不会影响内脏敏感性。未来的研究将探讨介导孕激素和雌二醇作用的特定甾体受体。 观点:据我们所知,这项研究首次描述了特定的大脑部位介导卵巢类固醇对内脏敏感性的影响。这些数据还表明,杏仁核依赖的机制至少部分负责女性内脏症状的恶化。
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