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Visual cortex damage in a ferret model of ocular hypertension

  • Laboratory Investigation
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Abstract

Purpose

We aimed to analyze the changes in the visual cortex of a ferret model of ocular hypertension (OH) using cytochrome oxidase (CO) staining.

Study design

Experimental.

Methods

OH was induced in 9 ferrets by means of injection of cultured conjunctival cells into the anterior chamber of the right eye. Three ferrets were used as the controls. CO staining was performed to assess the metabolic intensity at the II-III and IVC layers of the visual cortex.

Results

The intensities of CO staining in the right and left II-III layers of the primary visual cortex (V1) in the OH ferrets were 39.8 ± 10.3 and 41.9 ± 9.2 arbitrary units, respectively. In the control ferrets, the intensity was 88.1 ± 8.1 arbitrary units. The intensity of CO staining of the II-III layers obtained from the OH eyes was significantly lower than that from the control eyes (unpaired t test, P < .01). The intensities of CO staining in the right and left IVC layers of V1 in the OH ferrets were 60.3 ± 12.8 and 60.0 ± 13.5 arbitrary units, respectively. In the control ferrets, the intensity was 111.4 ± 9.6 arbitrary units. The CO staining intensity of the IVC layer obtained from the OH eyes was significantly lower than that from the control eyes (unpaired t test, P < .01).

Conclusion

The CO staining intensity was reduced in the visual cortex from OH eyes. This study revealed that OH causes metabolic change in the visual cortex.

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Acknowledgments

This research was funded by the Japan Society for the Promotion of Science, kakenhi grant number JP 19K09946.

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Authors and Affiliations

  1. Department of Ophthalmology, University of Tokyo School of Medicine, 7-3-1 Hongo Bunkyoku, Tokyo, 113-8655, Japan

    Takashi Fujishiro, Megumi Honjo & Makoto Aihara

  2. Department of Medical Neuroscience, Graduate School of Medicine, Kanazawa University, 13-1 Takaramachi, Kanazawashi, Kanazawa, Japan

    Hiroshi Kawasaki

Authors
  1. Takashi Fujishiro
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  2. Megumi Honjo
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  3. Hiroshi Kawasaki
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  4. Makoto Aihara
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Correspondence to Makoto Aihara.

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T. Fujishiro, None; M. Honjo, None; H. Kawasaki, None; M. Aihara, None.

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Corresponding Author: Makoto Aihara

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Fujishiro, T., Honjo, M., Kawasaki, H. et al. Visual cortex damage in a ferret model of ocular hypertension. Jpn J Ophthalmol 66, 205–212 (2022). https://doi.org/10.1007/s10384-022-00901-8

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  • DOI: https://doi.org/10.1007/s10384-022-00901-8

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