Transcriptional induction of slit diaphragm genes by Lmx1b is required in podocyte differentiation.

Transcriptional induction of slit diaphragm genes by Lmx1b is required in podocyte differentiation.
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Lmx1b 诱导裂隙基因转录是足细胞分化所必需的。

DOI:
10.1172/jci13954
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发表时间:
2002
期刊:
The Journal of clinical investigation
影响因子:
--
通讯作者:
Lee,Brendan
Lee,Brendan
中科院分区:
--
文献类型:
--
作者:
Miner,JeffreyH;Morello,Roy;Andrews,KayaL;Li,Cong;Antignac,Corinne;Shaw,AndreyS;Lee,Brendan

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LMX 1B编码一个LIM同源域转录因子。LMX 1B基因突变可导致甲-髌骨综合征,这是一种常染色体显性遗传疾病,伴有骨骼异常、甲发育不全和肾病。Lmx 1b-/-小鼠肾小球基底膜(GBM)胶原表达减少,提示肾小球肾炎的一个基础。在这里,我们发现Lmx 1b-/-足细胞的足突数量减少,发育不良,缺乏典型的狭缝隔膜,表明发育停滞。使用对足细胞功能重要的足细胞蛋白的抗体,我们发现Lmx 1b-/-足细胞表达接近正常水平的nephrin、synaptopodin、ZO-1、α3整合素和GBM层粘连蛋白。然而,CD 2AP和podocin的mRNA和蛋白质水平大大降低,表明这些分子在足突和狭缝隔膜形成中的协同作用。我们在CD 2AP和NPHS 2(podocin)的假定调控区中鉴定了几个LMX 1B结合位点,并证明LMX 1B在体外与这些序列结合,并在共转染试验中通过它们激活转录。因此,LMX 1B调节多种足细胞基因的表达,这些基因对足细胞分化和功能至关重要。我们的研究结果表明,与足突和肾小球裂膜相关的蛋白质水平降低可能与肾小球基底膜胶原水平降低沿着导致肾小球肾炎相关的肾病。
LMX1Bencodes a LIM-homeodomain transcription factor. Mutations inLMX1Bcause nail-patella syndrome (NPS), an autosomal dominant disease with skeletal abnormalities, nail hypoplasia, and nephropathy. Expression of glomerular basement membrane (GBM) collagens is reduced inLmx1b–/–mice, suggesting one basis for NPS nephropathy. Here, we show thatLmx1b–/–podocytes have reduced numbers of foot processes, are dysplastic, and lack typical slit diaphragms, indicating an arrest in development. Using antibodies to podocyte proteins important for podocyte function, we found thatLmx1b–/–podocytes express near-normal levels of nephrin, synaptopodin, ZO-1, α3 integrin, and GBM laminins. However, mRNA and protein levels for CD2AP and podocin were greatly reduced, suggesting a cooperative role for these molecules in foot process and slit diaphragm formation. We identified several LMX1B binding sites in the putative regulatory regions of bothCD2APandNPHS2(podocin) and demonstrated that LMX1B binds to these sequences in vitro and can activate transcription through them in cotransfection assays. Thus,LMX1Bregulates the expression of multiple podocyte genes critical for podocyte differentiation and function. Our results indicate that reduced levels of proteins associated with foot processes and the glomerular slit diaphragm likely contribute, along with reduced levels of GBM collagens, to the nephropathy associated with NPS.
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期刊: Development (Cambridge, England)
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