Discovery of new glomerular disease-relevant genes by translational profiling of podocytes in vivo.

Discovery of new glomerular disease-relevant genes by translational profiling of podocytes in vivo.
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DOI:
10.1038/ki.2014.204
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发表时间:
2014-12
影响因子:
19.6
通讯作者:
--
中科院分区:
医学1区
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确定新的生物标志物和治疗靶点的足细胞病变,如局灶节段性肾小球硬化症(FSGS),需要在疾病过程中的足细胞的转录变化的详细分析。在这里,我们使用翻译核糖体亲和纯化(TRAP)分离和配置文件足细胞特异性mRNA在两个不同的模型FSGS。在胶原蛋白1α1启动子的控制下,足细胞中表达的eGFP标记的核糖体蛋白L10 a能够在疾病过程中以一步过程分离足细胞特异性mRNA。该TRAP方案稳健地富集了已知的足细胞特异性mRNA。我们将col 1 α1-L10 a小鼠与actn 4 −/−和actn 4 +/K256 E FSGS模型杂交,并分析了2、6和44周龄时的足细胞转录谱。在FSGS患者的活检组织中,发现小鼠FSGS中两个上调的足细胞基因(CXCL 1和DMPK)在蛋白水平上上调,验证了这种方法。在疾病期间,足细胞特异性转录物没有稀释。这些是衰老过程中和两种FSGS模型中的第一个足细胞特异性RNA表达数据集。这种方法鉴定了在FSGS中上调的新的足细胞蛋白,并有助于定义人类肾小球疾病的新生物标志物和治疗靶点。
Identifying new biomarkers and therapeutic targets for podocytopathies such as focal segmental glomerulosclerosis (FSGS) requires a detailed analysis of transcriptional changes in podocytes over the course of disease. Here we used translating ribosome affinity purification (TRAP) to isolate and profile podocyte-specific mRNA in two different models of FSGS. Expressed eGFP-tagged ribosomal protein L10a in podocytes under the control of the Collagen-1α1 promoter enabled podocyte-specific mRNA isolation in a one-step process over the course of disease. This TRAP protocol robustly enriched known podocyte-specific mRNAs. We crossed col1α1-L10a mice with the actn4−/− and actn4+/K256E models of FSGS and analyzed podocyte transcriptional profiles at 2, 6 and 44 weeks of age. Two upregulated podocyte genes in murine FSGS (CXCL1 and DMPK) were found to be upregulated at the protein level in biopsies from patients with FSGS, validating this approach. There was no dilution of podocyte-specific transcripts during disease. These are the first podocyte-specific RNA expression datasets during aging and in two models of FSGS. This approach identified new podocyte proteins that are upregulated in FSGS and help define novel biomarkers and therapeutic targets for human glomerular disease.
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