Ectopic retinal ON bipolar cell synapses in the OFF inner plexiform layer: contacts with dopaminergic amacrine cells and melanopsin ganglion cells.

Ectopic retinal ON bipolar cell synapses in the OFF inner plexiform layer: contacts with dopaminergic amacrine cells and melanopsin ganglion cells.
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外丛状层中的双极细胞突触上的异位视网膜:与多巴胺能小链氨酸细胞和黑色素蛋白神经节细胞的接触。

DOI:
10.1002/cne.22158
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发表时间:
2009-11-10
期刊:
The Journal of comparative neurology
影响因子:
--
通讯作者:
Berson DM
Berson DM
中科院分区:
其他
文献类型:
--
作者:
Dumitrescu ON;Pucci FG;Wong KY;Berson DM

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视网膜组织的一个关键原理是,不同的开和关通道由不同的双极细胞群传递到内丛状层(IPL)的不同亚层。在双极细胞上,轴突被认为仅在内侧IPL(On亚板)与On型无长突细胞和神经节细胞的树突上突触。然而,表达M1黑素的神经节细胞和多巴胺能无长突(DA)细胞显然违反了这一教义。两者都是由ON双极细胞驱动的,但它们的树突分层分布在最外层的IPL,在Off亚板内。在小鼠视网膜上,我们发现一些锥体双极细胞在最外层的下层形成带状突触,在那里它们与M1和DA细胞的树突共层并接触。全细胞记录和视网膜切片中的染料填充表明,视锥双极上的6型在通道输入上提供了一些这种异位。对分离的双极细胞的成像研究表明,这些异位带状突触能够囊泡释放。因此,在外部IPL中的子层上有附件。
A key principle of retinal organization is that distinct ON and OFF channels are relayed by separate populations of bipolar cells to different sublaminae of the inner plexiform layer (IPL). ON bipolar cell axons have been thought to synapse exclusively in the inner IPL (the ON sublamina) onto dendrites of ON-type amacrine and ganglion cells. However, M1 melanopsin-expressing ganglion cells and dopaminergic amacrine (DA) cells apparently violate this dogma. Both are driven by ON bipolar cells, but their dendrites stratify in the outermost IPL, within the OFF sublamina. Here, in the mouse retina, we show that some ON cone bipolar cells make ribbon synapses in the outermost OFF sublayer, where they costratify with and contact the dendrites of M1 and DA cells. Whole-cell recording and dye filling in retinal slices indicate that Type 6 ON cone bipolars provide some of this ectopic ON channel input. Imaging studies in dissociated bipolar cells show that these ectopic ribbon synapses are capable of vesicular release. There is thus an accessory ON sublayer in the outer IPL.
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