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首页> 外文期刊>Journal of Cellular Physiology >D-aspartic acid in the nervous system of Aplysia limacina: possible role in neurotransmission.
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D-aspartic acid in the nervous system of Aplysia limacina: possible role in neurotransmission.

机译:神经系统的d -天门冬氨酸海兔在神经传递limacin:可能的作用。

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摘要

In the marine mollusk Aplysia limacina, a substantial amount of endogenous D-aspartic acid (D-Asp) was found following its synthesis from L-aspartate by an aspartate racemase. Concentrations of D-Asp between 3.9 and 4.6 micromol/g tissue were found in the cerebral, abdominal, buccal, pleural, and pedal ganglia. In non nervous tissues, D-Asp occurred at a very low concentration compared to the nervous system. Immunohistochemical studies conducted on cultured Aplysia neurons using an anti-D-aspartate antibody demonstrated that D-Asp occurs in the soma, dendrites, and in synaptic varicosities. Synaptosomes and synaptic vesicles from cerebral ganglia were prepared and characterized by electron microscopy. HPLC analysis revealed high concentrations of D-Asp together with L-aspartate and L-glutamate in isolated synaptosomes In addition, D-Asp was released from synaptosomes by K+ depolarization or by ionomycin. D-Asp was one of the principal amino acids present in synaptic vesicles representing about the 25% of total amino acids present in these cellular organelles. Injection of D-Asp into live animals or addition to the incubation media of cultured neurons, caused an increase in cAMP content. Taken as a whole, these findings suggest a possible role of D-Asp in neurotransmission in the nervous system of Aplysia limacina.
机译:在海洋软体动物海兔limacin,大量的内生d -天门冬氨酸(D-Asp)被发现后合成由天冬氨酸消旋酶L-aspartate。D-Asp浓度在3.9和4.6之间micromol / g组织中发现了大脑,腹部、颊、胸膜和踏板神经节。非神经组织,D-Asp发生在一个非常低的浓度与神经系统。在培养免疫组织化学研究海兔使用anti-D-aspartate神经元抗体表明D-Asp发生在soma,树突和突触静脉曲张。突触体,从大脑突触囊泡ganglia是准备和特征电子显微镜。浓度的D-Asp L-aspartate在一起和L-glutamate孤立突触体另外,D-Asp从突触体被释放K +去极化或ionomycin。在突触的主要氨基酸存在囊泡约占总量的25%氨基酸在这些细胞的细胞器。注射D-Asp住动物或添加孵化培养神经元的媒体,营内容的增加引起的。总的来说,这些发现表明可能的作用D-Asp在神经系统的神经传递海兔limacin)。

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