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代谢型谷氨酸受体7亚型在大鼠中枢神经系统内的分布 |
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n in the olfactory bulb,anterior olfactory nucleus,piriform cortex,septofimbrial nucleus,bed nucleus of the strial terminalis,lateral hypothalamic area,paraventricular hypothalamic nucleus,supramammillary nucleus,medial and lateral mammillary nuclei,most part of the thalamus,medial and lateral geniculate bodies,nucleus of the optic tract,red nucleus,substantia nigra,interpeduncular nucleus,pontine nuclei,lateral parabrachial nucleus,superior olivary complex,nucleus of the trapezoid body,motor nucleus of the trigeminal nerve,facial nucleus,ambiguus nucleus,cochlear nucleus,vestibular nuclei,nucleus of the solitary tract,hypoglossal nucleus,prepositus hypoglossal nucleus,medullary reticular formation,Purkinje cells of the cerebellum,nucleus raphe obscurus,intermediolateral nucleus of the spinal cord,Onuf′s nucleus and lamina X of the spinal cord.In addition,weak mGluR7-LI was detected in some other regions of the brain and spinal cord.Conclusion The present results indicate that mGluR7 is widely distributed in the central nervous system of the rat,and suggest that mGluR7 might play an important role in the excitatory synaptic transmission induced by glutamate. 【Key words】 Metabotropic glutamate receptor 7 subtype; Glutamate; Brain; Spinal cord; Immunohistochemistry; Rat
众所周知,谷氨酸(Glu)是广泛存在于哺乳动物中枢神经系统内的一种兴奋性神经递质,与快速兴奋性突触传递、神经元的发育和死亡、突触的可塑性以及某些神经疾病的发病密切相关[1]。长期以来人们一直认为Glu是通过激活了配体门控性阳离子通道而发挥作用,此类受体被称为离子型谷氨酸受体。近年来,大量生理学和药理学实验表明,Glu还可通过与G蛋白偶联的一类受体来调节兴奋性突触的活动和神经元的兴奋性,此类受体被命名为代谢型谷氨酸受体(metabotropic glutamate receptors,mGluRs)。目前应用分子生物学技术已成功地克隆出mGluR的8种亚型(mGluR1-8)[2~7]。按照各亚型间氨基酸序列的同源性和偶联的细胞内第二信使及对激动剂的选择性,将mGluR1-8分为3组:(1)mGluR1和mGluR5;(2)mGluR2和mGluR3;(3)mGluR4、mGluR6、mGluR7和mGluR8。第3组的特征是可以抑制细胞内腺苷酸环化酶的活性使细胞内cAMP的含量降低,并对激动剂L-2氨基-4-磷酰丁酸(1-2-amino-4-phosphonobutyrate,L-AP4)具有高度亲合力[8]。这组受体中的mGluR7为含874个氨基酸残基膜蛋白,并具有G蛋白偶联受体的7次跨膜结构特征[7]。原位杂交组织化学研究发现mGluR7广泛分布在大鼠中枢神经系统内[9]。但原位杂交组织化学只能用于研究神经元是否表达mGluR7 mRNA,不能用于受体蛋白的定位研究。而受体蛋白的定位研究对了解受体的功能是不可缺少的。此外,已有的药理学研究上一页 [1] [2] [3] 下一页 上一个医学论文: 大鼠大脑运动皮质与脑干面口部运动前神经元的突触联系 下一个医学论文: 贵州省1994 1998年人口死因及潜在减寿年数分析
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