Johnson Anthony C, Greenwood-Van Meerveld Beverley
Oklahoma Center for Neuroscience, University of Oklahoma Health Science Center, Oklahoma City, OK, USA.
Oklahoma Center for Neuroscience, University of Oklahoma Health Science Center, Oklahoma City, OK, USA; Department of Physiology, University of Oklahoma Health Science Center, Oklahoma City, OK, USA; VA Medical Center, University of Oklahoma Health Science Center, Oklahoma City, OK, USA.
Neuropharmacology. 2015 Jun;93:116-23. doi: 10.1016/j.neuropharm.2015.01.018. Epub 2015 Feb 3.
Previously we demonstrated that exposure of the central nucleus of the amygdala (CeA) to elevated corticosterone (CORT) induces nociceptive behaviors that are reversed by glucocorticoid and/or mineralocorticoid (GR/MR) receptor antagonism. Here we test the hypothesis that in a cholesterol (CHOL)-implanted control rat, selective knockdown of GR/MR in the CeA would, via a corticotropin-releasing factor (CRF)-mediated mechanism, replicate the nociceptive behaviors produced by elevated amygdala CORT. Micropellets of CHOL or CORT were stereotaxically placed on the dorsal margin of the CeA. Cannulae were implanted into the CeA for the delivery of vehicle or oligodeoxynucleotide (ODN) of either antisense (ASO) or random sequences (RSO) targeting GR or MR. Visceromotor behavioral response quantified visceral sensitivity in response to colonic distension, while von Frey filaments assessed somatic sensitivity. Receptor expression was determined with qRT-PCR. In CHOL implanted controls, knockdown of GR in the CeA increased both colonic and somatic sensitivity, whereas selective knockdown of MR in the CeA induced colonic hypersensitivity without affecting somatic sensitivity. CRF expression in the CeA was increased in CHOL-implanted rats treated with GR or MR ASO and resembled the augmented CRF expression seen in the CORT-implanted rats. This is the first study to demonstrate that decreasing either GR or MR within the CeA is sufficient to induce visceral hypersensitivity whereas somatic hypersensitivity developed after only GR knockdown. The loss of either GR or MR was associated with an increased CRF expression, and may represent a common mechanism for the development of CeA-mediated nociceptive behaviors.
此前我们证明,杏仁核中央核(CeA)暴露于升高的皮质酮(CORT)会诱发伤害性反应行为,而糖皮质激素和/或盐皮质激素(GR/MR)受体拮抗剂可逆转这些行为。在此,我们测试以下假设:在植入胆固醇(CHOL)的对照大鼠中,CeA中GR/MR的选择性敲低将通过促肾上腺皮质激素释放因子(CRF)介导的机制,重现杏仁核CORT升高所产生的伤害性反应行为。将CHOL或CORT微丸立体定向放置在CeA的背侧边缘。将套管植入CeA,用于递送载体或针对GR或MR的反义(ASO)或随机序列(RSO)的寡脱氧核苷酸(ODN)。内脏运动行为反应量化了对结肠扩张的内脏敏感性,而von Frey细丝评估了躯体敏感性。用qRT-PCR测定受体表达。在植入CHOL的对照中,CeA中GR的敲低增加了结肠和躯体敏感性,而CeA中MR的选择性敲低诱导了结肠超敏反应,而不影响躯体敏感性。在用GR或MR ASO处理的植入CHOL的大鼠中,CeA中的CRF表达增加,类似于在植入CORT的大鼠中观察到的CRF表达增加。这是第一项证明在CeA内降低GR或MR足以诱导内脏超敏反应的研究,而只有在GR敲低后才会出现躯体超敏反应。GR或MR的缺失与CRF表达增加有关,可能代表了CeA介导的伤害性反应行为发展的共同机制。
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