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Immunolocalization of transforming growth factor β during wound repair in rat retina after laser photocoagulation

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Abstract

• Background: Scatter photocoagulation induces regression of retinal neovascularization, but the mechanism of its therapeutic effect is incompletely understood. To elucidate the mechanism of therapeutic effect of photocoagulation is the main focus of our research. We have already demonstrated basic fibroblast growth factor (bFGF) immunolocalization during retinal wound repair following laser photocoagulation. Transforming growth factor beta (TGF β) reportedly inhibits endothelial cell growth and bFGF-induced cell proliferation in vitro. In the present study, we evaluated the immunohistochemical localization of TGF-β1 and -β2 during wound repair in the rat retina following laser photocoagulation. • Methods: Krypton laser photocoagulation was performed on the eyes of pigmented rats. The eyes were then enucleated on day 1, 3, 7, 14, 28 or 56 following the photocoagulation and enrolled into the analysis of immunohistochemical localization of TGF-β1 and -β2. • Results: Immunoreactivity for TGF-β1 and -β2 was present in the ganglion cell layer and photoreceptor outer segments of the normal adult rat retina. The cytoplasm of RPE cells at the photocoagulated lesion showed intense TGF-β1 and -β2 immunoreactivity on day 3 after laser photocoagulation. Macrophages that migrated into the lesion lacked positive staining for TGF-β1 and -β2. TGF-β immunoreactivity in RPE cells continued to be upregulated for more than 1 month compared with that in normal RPE cells. Controls did not exhibit any positive staining. • Conclusion: An elevated expression of TGF-β immunoreactivity for a longer period of time than bFGF was observed in RPE cells at the photocoagulated lesion in vivo. In the late phase of retinal wound repair, TGF-β may inhibit cell proliferation induced by mitogens, introduce an end stage of cellular events, and induce extracellular matrix induction.

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Authors and Affiliations

  1. Department of Ophthalmology, Kansai Medical University, 10-15 Fumizono, Moriguchi, 570, Osaka, Japan

    Chikako Yamamoto, Nahoko Ogata, Xianjin Yi, Kanji Takahashi, Miki Miyashiro, Haruhiko Yamada & Masanobu Uyama

  2. The Third Department of Internal Medicine, Kansai Medical University, Japan

    Kouichi Matsuzaki

Authors
  1. Chikako Yamamoto
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  2. Nahoko Ogata
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  3. Xianjin Yi
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  4. Kanji Takahashi
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  5. Miki Miyashiro
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  6. Haruhiko Yamada
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  7. Masanobu Uyama
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  8. Kouichi Matsuzaki
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Additional information

This study was supported in part by The Science Research Promotion Fund of the Japan Private School Promotion Foundation (Dr. Uyama), and by a Grant-in-Aid for Developmental Scientific Research from the Ministry of Education, Science and Culture of the Japanese Government (Dr. Uyama)

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Yamamoto, C., Ogata, N., Yi, X. et al. Immunolocalization of transforming growth factor β during wound repair in rat retina after laser photocoagulation. Graefe’s Arch Clin Exp Ophthalmol 236, 41–46 (1998). https://doi.org/10.1007/s004170050040

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  • DOI: https://doi.org/10.1007/s004170050040

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