摘要
最近报导,与精氨酸代谢相关的酶的改变参与阿尔茨海默氏病(AD)。尽管有较强的精氨酸与一氧化氮(NO)通路的变化,β-淀粉样蛋白(Aβ)肽对精氨酸的降解和再合成的影响是未知的。在本研究中我们比较精氨酸酶(ARG1, ARG2)表达水平、神经元、内皮细胞和诱导型一氧化氮合酶亚型(NNOS, ENOS, INOS)、代谢或合成瓜氨酸和精氨酸在大鼠嗜铬细胞瘤相应氨基酸水平的酶(PC12)细胞中过表达的人β-淀粉样蛋白前体蛋白(APPwt细胞)。此外,我们研究负责阿尔茨海默氏病脑内精氨酸代谢调控miRNA的变化。实时PCR分析显示在APPwt细胞ARG1 和 ARG2显著降低是负责裂解成精氨酸鸟氨酸和尿素;减少后显著降低酶的活性。在APPwt细胞中NNOS 和ENOS mRNA升高,而iNOS在细胞系中检测不到。琥珀酸合成酶(ASS)的表达代谢瓜氨酸下调没有琥珀酸裂解酶(ASL)的变化。鸟氨酸脱羧酶(ODC),鸟氨酸脱羧形成腐胺也减少了。精氨酸,为精氨酸酶和一氧化氮合酶的底物, 在APPwt细胞中不变。然而,瓜氨酸浓度明显升高。阿尔茨海默氏病脑组织中发现了miRNA-9 和 miRNA-128a可以分别调节的琥珀酸合成酶和一氧化氮合酶的表达。我们的研究结果表明,β-淀粉样蛋白影响精氨酸代谢,并且这种影响可能在阿尔茨海默氏病的发病机制很重要
关键词: Β-淀粉样蛋白,β淀粉样前体蛋白、精氨酸酶,一氧化氮合酶,鸟氨酸循环、尿素循环
Current Alzheimer Research
Title:Altered Arginine Metabolism in Cells Transfected with Human Wild-Type Beta Amyloid Precursor Protein (βAPP)
Volume: 13 Issue: 9
Author(s): Henryk Jęśko, Anna Wilkaniec, Magdalena Cieślik, Wojciech Hilgier, Magdalena Gąssowska, Walter J. Lukiw, Agata Adamczyk
Affiliation:
关键词: Β-淀粉样蛋白,β淀粉样前体蛋白、精氨酸酶,一氧化氮合酶,鸟氨酸循环、尿素循环
摘要: Alterations of enzymes linked to arginine metabolism have been recently implicated in Alzheimer's disease (AD). Despite strong association of arginine changes with nitric oxide (NO) pathway, the impact of amyloid β (Aβ) peptides on arginine degradation and re-synthesis is unknown. In the present study we compared expression levels of arginases (ARG1, ARG2), neuronal, endothelial and inducible NO synthase isoforms (NNOS, ENOS, INOS), enzymes that metabolize arginine or resynthesize it from citrulline and the levels of corresponding amino acids in rat pheochromocytoma (PC12) cells overexpressing human Aβ precursor protein (APPwt cells). Moreover, we investigated the changes in miRNAs responsible for modulation of arginine metabolism in AD brains. Real-time PCR analysis revealed in APPwt cells significant decreases of ARG1 and ARG2 which are responsible for lysing arginine into ornithine and urea; this reduction was followed by significantly lower enzyme activity. NNOS and ENOS mRNAs were elevated in APPwt cells while iNOS was undetectable in both cell lines. The expression of argininosuccinate synthase (ASS) that metabolizes citrulline was down-regulated without changes in argininosuccinate lyase (ASL). Ornithine decarboxylase (ODC), which decarboxylates ornithine to form putrescine was also reduced. Arginine, the substrate for both arginases and NOS, was unchanged in APPwt cells. However, citrulline concentration was significantly higher. Elevated miRNA-9 and miRNA-128a found in AD brain tissues might modulate the expression of ASS and NOS, respectively. Our results indicate that Aβ affects arginine metabolism and this influence might have important role in the pathomechanism of AD.
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Henryk Jęśko, Anna Wilkaniec, Magdalena Cieślik, Wojciech Hilgier, Magdalena Gąssowska, Walter J. Lukiw, Agata Adamczyk , Altered Arginine Metabolism in Cells Transfected with Human Wild-Type Beta Amyloid Precursor Protein (βAPP), Current Alzheimer Research 2016; 13 (9) . https://dx.doi.org/10.2174/1567205013666160314150348
DOI https://dx.doi.org/10.2174/1567205013666160314150348 |
Print ISSN 1567-2050 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-5828 |
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