Lhx9 Is Required for the Development of Retinal Nitric Oxide-Synthesizing Amacrine Cell Subtype.

Lhx9 Is Required for the Development of Retinal Nitric Oxide-Synthesizing Amacrine Cell Subtype.
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DOI:
10.1007/s12035-017-0554-y
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发表时间:
2018-04
影响因子:
5.1
通讯作者:
Gan L
Gan L
中科院分区:
医学2区
文献类型:
--
作者:
Balasubramanian R;Bui A;Dong X;Gan L

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无突细胞是视网膜神经元中最多样化的一组。无突中间神经元的各种亚型介导绝大多数的图像形成和非图像形成的视觉功能。调控个体无毛细胞亚型发育的转录调控尚不清楚。其中一种无毛细胞亚型包括表达无毛细胞(NOACs)的神经元型一氧化氮合酶(nNOS/bNOS/NOS1),其调节一氧化氮(NO)的释放,一氧化氮是一种在视网膜中具有生理和临床意义的神经递质。我们已经确定lim同源结构域转录因子LHX9对NOACs的发生是必要的。在视网膜发育过程中,NOACs表达Lhx9,而Lhx9缺失的视网膜缺乏NOACs。Lhx9-null视网膜内丛状层树突分层也有畸变。我们的细胞谱系追踪研究表明,表达lhx9的细胞产生GAD65和GAD67表达的gaba能无毛细胞亚群。随着发育的进行,Lhx9在gaba能细胞的GAD65亚群中下调,并且主要局限于NOACs所在的无毛细胞的GAD67亚群。综上所述,我们发现Lhx9是一个新的分子标记,它定义了无毛细胞的一个子集,并表明它是无毛细胞NOAC亚型发育所必需的。
Amacrine cells are the most diverse group of retinal neurons. Various subtypes of amacrine interneurons mediate a vast majority of image forming and non-image forming visual functions. The transcriptional regulation governing the development of individual amacrine cell subtypes is not well understood. One such amacrine cell subtype comprises neuronal nitric oxide synthase (nNOS/bNOS/NOS1)-expressing amacrine cells (NOACs) that regulate the release of nitric oxide (NO), a neurotransmitter with physiological and clinical implications in the retina. We have identified the LIM-homeodomain transcription factor LHX9 to be necessary for the genesis of NOACs. During retinal development, NOACs express Lhx9, and Lhx9-null retinas lack NOACs. Lhx9-null retinas also display aberrations in dendritic stratification at the inner plexiform layer. Our cell lineage-tracing studies show that Lhx9-expressing cells give rise to both the GAD65 and GAD67 expressing sub-populations of GABAergic amacrine cells. As development proceeds, Lhx9 is downregulated in the GAD65 sub-population of GABAergic cells and is largely restricted to the GAD67 sub-population of amacrine cells that NOACs are a part of. Taken together, we have uncovered Lhx9 as a new molecular marker that defines a subset of amacrine cells and show that it is necessary for the development of the NOAC subtype of amacrine cells.
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