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在狨猴(Callithrix jacchus)的视网膜中,S-视锥细胞对OFF-侏儒通路没有贡献。

S-cones do not contribute to the OFF-midget pathway in the retina of the marmoset, Callithrix jacchus.

作者信息

Lee Sammy C S, Telkes Ildiko, Grünert Ulrike

机构信息

The National Vision Research Institute of Australia, The University of Melbourne, Carlton VIC 3053, Australia.

出版信息

Eur J Neurosci. 2005 Jul;22(2):437-47. doi: 10.1111/j.1460-9568.2005.04231.x.

Abstract

It is well established that in primate retina both medium- and long-wavelength-sensitive cone types provide input to the midget-parvocellular pathway. The question, however, whether short-wavelength-sensitive (S or 'blue') cones provide input to the OFF-division of the midget-parvocellular pathway is still controversial. In the present study, we investigated the connections of nearly 400 S-cones with OFF-midget bipolar cells in central and peripheral retina of a New World monkey, the marmoset. Horizontal sections or pieces of whole retinae were double-labelled with an antiserum to S-cone opsin to identify S-cones and antibodies to the cell adhesion molecule CD15 to identify OFF-midget bipolar cells. Peanut agglutinin coupled to a fluorescent tag was used to label the cone pedicles of all cone types. Peanut agglutinin was also used to distinguish S-cones from the other cone types. The sections were analysed with deconvolution microscopy. We found that nearly all pedicles of medium- and long-wavelength-sensitive cones are located opposite distinct dendritic clusters formed by OFF-midget bipolar cells. By contrast, the S-cone pedicles are not located opposite dendritic clusters. Instead, S-cones make sparse contacts with CD15-labelled processes. Some of these processes protruded from OFF-midget bipolar clusters, whereas others could be traced to a diffuse bipolar cell type. Thus, in the marmoset retina the midget-parvocellular system does not carry a blue-OFF signal.

摘要

灵长类动物视网膜中,中波和长波敏感视锥细胞类型均为侏儒-小细胞通路提供输入,这一点已得到充分证实。然而,短波长敏感(S或“蓝色”)视锥细胞是否为侏儒-小细胞通路的OFF分支提供输入,这一问题仍存在争议。在本研究中,我们调查了新世界猴狨猴的中央和周边视网膜中近400个S视锥细胞与OFF侏儒双极细胞之间的连接。水平切片或整个视网膜切片用抗S视锥蛋白抗血清进行双重标记以识别S视锥细胞,并用抗细胞粘附分子CD15抗体识别OFF侏儒双极细胞。与荧光标签偶联的花生凝集素用于标记所有视锥细胞类型的视锥小足。花生凝集素也用于区分S视锥细胞与其他视锥细胞类型。切片用去卷积显微镜进行分析。我们发现,中波和长波敏感视锥细胞的几乎所有小足都位于由OFF侏儒双极细胞形成的不同树突簇对面。相比之下,S视锥小足并不位于树突簇对面。相反,S视锥细胞与CD15标记的突起有稀疏接触。其中一些突起从OFF侏儒双极细胞簇伸出,而其他突起可追溯到一种弥散型双极细胞类型。因此,在狨猴视网膜中,侏儒-小细胞系统不传递蓝色-OFF信号。

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