Tracer coupling of intrinsically photosensitive retinal ganglion cells to amacrine cells in the mouse retina.

Tracer coupling of intrinsically photosensitive retinal ganglion cells to amacrine cells in the mouse retina.
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DOI:
10.1002/cne.22490
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发表时间:
2010-12-01
影响因子:
2.5
通讯作者:
Baldridge, William H.
Baldridge, William H.
中科院分区:
医学3区
文献类型:
--
作者:
Muller, Luis Perez de Sevilla;Do, Michael Tri H.;Yau, King-Wai;He, Shigang;Baldridge, William H.

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本质光敏视网膜神经节细胞 (ipRGC) 是哺乳动物视网膜中神经节细胞的一种亚型,表达感光色素、黑视蛋白,并驱动非成像视觉功能。 ipRGC 的三种形态亚型(M1、M2 和 M3)已根据其在内丛状层(IPL)中的树突分层进行了描述,但它们通过电耦合的潜在相互作用的问题仍未解决。在这项研究中,我们通过将示踪剂 Neurobiotin 注射到用荧光蛋白 tdTomato 基因标记的 ipRGC 中,解决了小鼠视网膜中的这个问题。我们根据 ipRGC 不同的树突分层证实了 ipRGC 的 M1-M3 亚型的存在。所有三种亚型均与位于神经节细胞层 (GCL) 但不位于内核层 (INL) 内的推定无长突细胞示踪偶联。与 M1 和 M2 细胞示踪剂偶联的细胞被证明是广域 GABA 免疫反应性无长突细胞。我们没有发现 ipRGC 的同源示踪偶联或与其他类型神经节细胞异源偶联的证据。
Intrinsically photosensitive retinal ganglion cells (ipRGCs) are a subtype of ganglion cell in the mammalian retina that expresses the photopigment, melanopsin, and drives non-image-forming visual functions. Three morphological subtypes of ipRGCs (M1, M2 and M3) have been described based on their dendritic stratifications in the inner plexiform layer (IPL), but the question of their potential interactions via electrical coupling remains unsettled. In this study, we have addressed this question in the mouse retina, by injecting the tracer Neurobiotin into ipRGCs that were genetically labelled with the fluorescent protein, tdTomato. We confirmed the presence of the M1-M3 subtypes of ipRGCs based on their distinct dendritic stratifications. All three subtypes were tracer-coupled to putative amacrine cells situated within the ganglion cell layer (GCL) but not the inner nuclear layer (INL). The cells tracer-coupled to the M1 and M2 cells were shown to be wide-field GABA-immunoreactive amacrine cells. We found no evidence of homologous tracer-coupling of ipRGCs or heterologous coupling to other types of ganglion cells.
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