A Zebrafish Acromegaly Model Elevates DNA Damage and Impairs DNA Repair Pathways.

A Zebrafish Acromegaly Model Elevates DNA Damage and Impairs DNA Repair Pathways.
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DOI:
10.3390/biology7040047
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发表时间:
2018-10-17
期刊:
影响因子:
4.2
通讯作者:
Kinoshita S
Kinoshita S
中科院分区:
生物学3区
文献类型:
--
作者:
Elbialy A;Asakawa S;Watabe S;Kinoshita S

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肢端肥大症是一种由于生长激素(GH)分泌过多而导致的病理状况。肢端肥大症患者的健康状况恶化,并出现许多相关并发症,如心血管问题、关节炎、肾脏疾病、肌肉无力和结肠癌。由于这些并发症普遍存在于全身,我们研究了 GH 过量对细胞完整性的影响。在这里,我们建立了稳定的肢端肥大症模型斑马鱼品系,该品系过表达罗非鱼 GH 和红色荧光蛋白 (RFP) 报告基因,用于跟踪世代中 GH 基因的表达,并对不同器官进行 RNA-Seq 数据分析。有趣的是,热图和表达激酶 (X2K) 分析揭示了不同器官中 DNA 损伤标记物的富集。此外,肢端肥大症斑马鱼幼虫和成体肢端肥大症模型大脑和肌肉的 H2A.X 免疫染色分析显示,DNA 损伤细胞的数量大幅增加。使用基因集富集分析(GSEA),我们发现肢端肥大症斑马鱼模型肝脏中的DNA修复途径受损,例如双链断裂(DSB)、同源重组修复(HRR)、非同源末端连接(NHEJ)、核苷酸切除修复(NER)和跨损伤合成(TLS)。有趣的是,DNA修复受损在肢端肥大症模型中比老年斑马鱼(三岁)更为突出。因此,我们的研究表明,细胞完整性的影响是肢端肥大症的特征。
Acromegaly is a pathological condition due to excess growth hormone (GH) secretion. Acromegaly patients exhibit a deterioration of health and many associated complications, such as cardiovascular issues, arthritis, kidney diseases, muscular weakness, and colon cancer. Since these complications are generalized throughout the body, we investigated the effect of GH excess on cellular integrity. Here, we established stable acromegaly model zebrafish lines that overexpress tilapia GH and the red fluorescence protein (RFP) reporter gene for tracking GH gene expression throughout generations, and performed RNA-Seq data analysis from different organs. Intriguingly, heatmap and Expression2Kinases (X2K) analysis revealed the enrichment of DNA damage markers in various organs. Moreover, H2A.X immunostaining analysis in acromegaly zebrafish larvae and the adult acromegaly model brain and muscle showed a robust increase in the number of DNA-damaged cells. Using Gene Set Enrichment Analysis (GSEA), we found that the acromegaly zebrafish model had impaired DNA repair pathways in the liver, such as double-strand break (DSB), homologous recombination repair (HRR), non-homologous end joining (NHEJ), nucleotide excision repair (NER), and translesion synthesis (TLS). Interestingly, the impairment of DNA repair was even more prominent in acromegaly model than in aged zebrafish (three years old). Thus, our study demonstrates that affection of cellular integrity is characteristic of acromegaly.
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