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Influence of phenylalanine and its derivatives on intracellular free calcium of embryonic rat cortical neurons
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- Author:
- No author available
- Journal Title:
- JOURNAL OF THE FOURTH MILITARY MEDICAL UNIVERSITY
- Issue:
- 20
- DOI:
- 10.3321/j.issn:1000-2790.2004.20.005
- Key Word:
- 苯丙酮尿症;钙成像;苯丙氨酸
Abstract： 目的:探讨苯丙酮尿症患者脑损伤的病理生理机制,分析苯丙氨酸和胞质游离钙有无关系.方法:用钙成像技术检测氨基酸及其衍生物对胚鼠皮层未成熟神经元胞质游离钙浓度的影响.结果:高浓度苯丙氨酸降低胞质游离钙,苯乙酸使胞质内钙浓度降低后升高最后又降低,苯乳酸使胞质内钙降低更明显.使用无钙离子无钠离子的细胞外液,苯乳酸降低胞质内钙的作用无明显影响;使用Thapsigargin阻断内质网上钙泵,苯乙酸虽仍能降低胞质内钙,但没有降低后又升高的现象.当苯丙氨酸、苯乙酸和苯乳酸相同浓度时,苯乙酸、苯乳酸较苯丙氨酸的作用更强.结论:结合我们以前的观察结果,苯丙氨酸可能激活plasma membrane Ca2+-ATPase,促进神经元胞质内钙外排,进而导致神经元胞质内钙浓度降低.
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