Short- and Long-Term Study of the Impact of Focal Blue Light-Emitting Diode-Induced Phototoxicity in Adult Albino Rats.

Abstract

BACKGROUND:

In adult rats we study the short- and long-term effects of focal blue light-emitting diode (LED)-induced phototoxicity (LIP) on retinal thickness and Iba-1+ activation.

METHODS:

The left eyes of previously dark-adapted Sprague Dawley (SD) rats were photoexposed to a blue LED (20 s, 200 lux). In vivo longitudinal monitoring of retinal thickness, fundus images, and optical retinal sections was performed from 1 to 30 days (d) after LIP with SD-OCT. Ex vivo, we analysed the population of S-cone and Iba-1+ cells within a predetermined fixed-size circular area (PCA) centred on the lesion.

RESULTS:

LIP resulted in a circular focal lesion readily identifiable in vivo by fundus examination, which showed within the PCAs a progressive thinning of the outer retinal layer, and a diminution of the S-cone population to 19% by 30 d. In parallel to S-cone loss, activated Iba-1+ cells delineated the lesioned area and acquired an ameboid morphology with peak expression at 3 d after LIP. Iba-1+ cells adopted a more relaxed-branched morphology at 7 d and by 14-30 d their morphology was fully branched.

CONCLUSION:

LIP caused a progressive reduction of the outer retina with loss of S cones and a parallel dynamic activation of microglial cells in the lesioned area.

• Authors: Juan A Miralles de Imperial-Ollero, Alejandro Gallego-Ortega, María Norte-Muñoz, Johnny Di Pierdomenico, José Manuel Bernal-Garro, Francisco J Valiente-Soriano, Manuel Vidal-Sanz
• Journal: International journal of molecular sciences (Int J Mol Sci) Vol. 22 Issue 18 (Sep 09 2021) ISSN: 1422-0067 [Electronic] Switzerland
• PMID: 34575905 (Publication Type: Journal Article)

Chemical References

• Biomarkers

Topics

• Animals
• Biomarkers
• Disease Models, Animal
• Disease Susceptibility
• Fluorescent Antibody Technique
• Light
• Microglia (metabolism, pathology, radiation effects)
• Rats
• Retina (metabolism, pathology, radiation effects)
• Retinal Cone Photoreceptor Cells (metabolism, pathology, radiation effects)
• Retinal Degeneration (diagnostic imaging, etiology, metabolism, pathology)
• Time Factors
• Tomography, Optical Coherence