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Apoptotic cell death and microglial cell responses in cultured rat retina

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Abstract

Background

Optic nerve transection results in degeneration of axotomized retinal ganglion cells followed by the activation of resident microglial cells.

Methods

An organotypic culture of neonatal rat retina was used to examine the temporal aspect of retinal ganglion cell death and microglial cell recruitment. Retinas were fixed at various times after explantation and prepared for immunohistochemistry and lectin staining.

Results

Terminal deoxytransferase dUTP nick-end labeling (TUNEL) and immunohistochemistry for cleaved caspase-3 demonstrated a massive cascade of cell death in the ganglion cell layer (GCL) within hours after explantation. The rate of cell death in this layer was high and continued over a period of 48 h. In contrast, the rate of cell death was low in the outer nuclear layer (ONL) and apoptotic cells were evident after 6 days in vitro. Increases in the density of microglial cells in the GCL appeared to be recruited by proliferation within hours after explantation. In parallel, resident microglial cells also acquired an activated morphology as revealed by isolectin B4 staining. Microglial cell activation in the GCL also included an upregulated expression for the lysosomal protein ED-1 and the cysteine protease inhibitor cystatin C. After 1 week of culture, immunolabeling for ED-1 demonstrated the presence of activated microglial cells also in the ONL.

Conclusion

These data show rapid microglial cell recruitment and activation following the axotomy-induced cell death of differentiated ganglion cells. The processes of microglial cell activation and cell death are slower in the outer retina.

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Acknowledgements

The Swedish Medical Research Council (13012–01A and 14X-2321), the Foundation Fighting Blindness, and Crown Princess Margret’s Committee for the Blind supported this study, as did the Knut and Alice Wallenberg Foundation, the Crafoord Foundation and the Faculty of Medicine, Lund University.

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Authors and Affiliations

  1. Wallenberg Retina Center, Department of Ophthalmology, University of Lund, BMC B13, 221 84 , Lund, Sweden

    Karl Engelsberg, Berndt Ehinger, Johan Wassélius & Kjell Johansson

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  1. Karl Engelsberg
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  2. Berndt Ehinger
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  3. Johan Wassélius
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  4. Kjell Johansson
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Correspondence to Kjell Johansson.

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Engelsberg, K., Ehinger, B., Wassélius, J. et al. Apoptotic cell death and microglial cell responses in cultured rat retina. Graefe's Arch Clin Exp Ophthalmol 242, 229–239 (2004). https://doi.org/10.1007/s00417-003-0780-z

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  • DOI: https://doi.org/10.1007/s00417-003-0780-z

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