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Temporal and spatial differences in expression of TrkB isoforms in rat retina during constant light exposure
Nobuharu Asai1, Toshiaki Abe, Takae Saito
1Division of Clinical Cell Therapy, Center for Translational and Advanced Animal Research, Tohoku University, Graduate School of Medicine, 1-1 Seiryoumachi, Aobaku, Sendai, Miyagi 980-8574, Japan.
Experimental Eye Research
|July 21, 2007
Summary
Brain-derived neurotrophic factor (BDNF) signaling via TrkB receptor isoforms in Mueller cells may protect the retina from light-induced damage. These protective mechanisms are activated before significant cell death occurs.
Area of Science:
- Neuroscience
- Ophthalmology
- Cell Biology
Background:
- Brain-derived neurotrophic factor (BDNF) offers neuroprotection to retinal cells, including those without TrkB receptors.
- Understanding BDNF and TrkB isoform expression is crucial for comprehending retinal cell rescue mechanisms.
Purpose of the Study:
- To investigate the retinal localization and temporal expression patterns of BDNF and its TrkB receptor isoforms (TrkB-FL, TrkB-T1) following light-induced retinal damage.
- To correlate the expression of BDNF and TrkB isoforms with the presence of TUNEL-positive cells, indicating cell death.
Main Methods:
- Sprague-Dawley rats were subjected to continuous light exposure for varying durations.
- BDNF, TrkB-FL, and TrkB-T1 expression were analyzed using Western blot, real-time PCR, immunohistochemistry, and in situ hybridization.
- TUNEL assays were performed to quantify cell death.
Main Results:
- TUNEL-positive cells peaked between 48-72 hours of light exposure.
- TrkB-T1 gene expression significantly increased at 24 hours.
- TrkB-FL was found in various retinal layers, with transient changes in the IPL and later increases on Mueller cell processes.
- TrkB-T1 was localized in the INL, OPL, and RPE, with upregulation on Mueller cells at 24 hours.
- TrkB-FL gene expression upregulated in the INL at 48 hours, coinciding with peak cell death.
- TrkB-T1 gene upregulation preceded or coincided with the appearance of TUNEL-positive cells.
Conclusions:
- BDNF utilizes distinct TrkB receptor isoforms (TrkB-FL and TrkB-T1) for signal transduction in retinal cells.
- Mueller cells play a key role, expressing TrkB isoforms in a temporally and spatially regulated manner during light-induced retinal degeneration.
- The differential expression of TrkB isoforms on Mueller cells suggests a protective role against light-induced retinal damage.
