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Distribution and synaptic organization of substance P-like immunoreactive neurons in the mouse retina

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Abstract

Substance P (SP), a neuroprotective peptidergic neurotransmitter, is known to have immunoreactivity (IR) localized to amacrine and/or ganglion cells in a variety of species’ retinas, but it has not yet been studied in the mouse retina. Thus, we investigated the distribution and synaptic organization of SP-IR by confocal and electron microscopy immunocytochemistry in the mouse retina. SP-IR was distributed in the inner nuclear layer (INL), inner plexiform layer (IPL), and ganglion cell layer (GCL). Most of the SP-IR somas belonged to amacrine cells (2.5% of all) in the INL and their processes stratified into the S1, S3, and S5 layers of the IPL, with the most intense band in the S5 layer. Some SP-IR somas can also be observed in the GCL, which were identified as displaced amacrine cells (82%, 1269/1550) and ganglion cells (18%, 281/1550) by antibodies against AP2α and RBPMS, respectively. Such SP-IR ganglion cells (1.2% of all RGCs) can be further divided into 3 subgroups expressing SP/α-Synuclein (α-Syn), SP/GAD67, and/or SP/GAD67/α-Syn. Possible physiological and pathological roles of these ganglion cells are discussed. Further, electron microscopy evidence demonstrates that SP-IR amacrine cells receive major inputs from other SP-IR amacrine cell processes (146/242 inputs) and output mostly to SP-negative amacrine cell processes (291/673 outputs), suggesting series inhibition among amacrine cells. These results reveal for the first time an explicit distribution, novel ganglion cell features, and synaptic organization of SP-IR in the mouse retina, which is important for the future use of mouse models to study the roles of SP in healthy and diseased (including Parkinson’s disease) retinal states.

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The data used to support the findings of this study are available from the corresponding author upon request but not publicly available due to ethical or privacy reasons.

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Acknowledgements

We thank Miss Yizhen Zhang for significant comments and helpful discussion.

Funding

This work was supported in part by Grants from National Key Research and Development Program of China (2022YFA1105503), State Key Laboratory of Neuroscience (SKLN-202103), Zhejiang Natural Science Foundation of China (Y21H120019), Zhejiang Provincial Health Commission Foundation of China (2021KY809).

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Contributions

JZ designed and supervised the experiments. FLW, WHZ, QWY performed immuno-electron microscopy and immunofluorescence. FLW and WHZ wrote the draft of the manuscript. WNZ and XQL performed sectioning and part immunofluorescence. BLR and XL participated in the design of the experiments. JZ, FLW, and WHZ conducted data analysis. JZ wrote the final manuscript. All authors approved the final manuscript.

Corresponding author

Correspondence to Jun Zhang.

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The authors do not report any conflicts of interests.

Ethical approval

This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Ethics Committee of Wenzhou Medical University in accordance with the ARVO guidelines.

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Wang, F., Zhong, W., Yang, Q. et al. Distribution and synaptic organization of substance P-like immunoreactive neurons in the mouse retina. Brain Struct Funct 228, 1703–1724 (2023). https://doi.org/10.1007/s00429-023-02688-x

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  • DOI: https://doi.org/10.1007/s00429-023-02688-x

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