Long-term characterization of retinal degeneration in royal college of surgeons rats using spectral-domain optical coherence tomography

Renee C. Ryals, Michael D. Andrews, Shreya Datta, Aaron S. Coyner, Cody M. Fischer, Yuquan Wen, Mark Pennesi, Trevor McGill

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

PURPOSE. Prospective treatments for age-related macular degeneration and inherited retinal degenerations are commonly evaluated in the Royal College of Surgeons (RCS) rat before translation into clinical application. Historically, retinal thickness obtained through postmortem anatomic assessments has been a key outcome measure; however, utility of this measurement is limited because it precludes the ability to perform longitudinal studies. To overcome this limitation, the present study was designed to provide a baseline longitudinal quantification of retinal thickness in the RCS rat by using spectral-domain optical coherence tomography (SD-OCT). METHODS. Horizontal and vertical linear SD-OCT scans centered on the optic nerve were captured from Long-Evans control rats at P30, P60, P90 and from RCS rats between P17 and P90. Total retina (TR), outer nuclear layer+ (ONL+), inner nuclear layer (INL), and retinal pigment epithelium (RPE) thicknesses were quantified. Histologic sections of RCS retina obtained from P21 to P60 were compared to SD-OCT images. RESULTS. In RCS rats, TR and ONL+ thickness decreased significantly as compared to Long- Evans controls. Changes in INL and RPE thickness were not significantly different between control and RCS retinas. From P30 to P90 a subretinal hyperreflective layer (HRL) was observed and quantified in RCS rats. After correlation with histology, the HRL was identified as disorganized outer segments and the location of accumulated debris. CONCLUSIONS. Retinal layer thickness can be quantified longitudinally throughout the course of retinal degeneration in the RCS rat by using SD-OCT. Thickness measurements obtained with SD-OCT were consistent with previous anatomic thickness assessments. This study provides baseline data for future longitudinal assessment of therapeutic agents in the RCS rat.

Original languageEnglish (US)
Pages (from-to)1378-1386
Number of pages9
JournalInvestigative Ophthalmology and Visual Science
Volume58
Issue number3
DOIs
StatePublished - Mar 1 2017

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Retinal Degeneration
Optical Coherence Tomography
Retina
Retinal Pigment Epithelium
Surgeons
Long Evans Rats
Macular Degeneration
Optic Nerve
Longitudinal Studies
Histology
Outcome Assessment (Health Care)

Keywords

  • Animal models
  • Inherited retinal degeneration
  • MERTK
  • Royal College of Surgeons Rat
  • Spectral-domain optical coherence tomography

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

Cite this

Long-term characterization of retinal degeneration in royal college of surgeons rats using spectral-domain optical coherence tomography. / Ryals, Renee C.; Andrews, Michael D.; Datta, Shreya; Coyner, Aaron S.; Fischer, Cody M.; Wen, Yuquan; Pennesi, Mark; McGill, Trevor.

In: Investigative Ophthalmology and Visual Science, Vol. 58, No. 3, 01.03.2017, p. 1378-1386.

Research output: Contribution to journalArticle

Ryals, Renee C. ; Andrews, Michael D. ; Datta, Shreya ; Coyner, Aaron S. ; Fischer, Cody M. ; Wen, Yuquan ; Pennesi, Mark ; McGill, Trevor. / Long-term characterization of retinal degeneration in royal college of surgeons rats using spectral-domain optical coherence tomography. In: Investigative Ophthalmology and Visual Science. 2017 ; Vol. 58, No. 3. pp. 1378-1386.
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AU - Datta, Shreya

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AU - Fischer, Cody M.

AU - Wen, Yuquan

AU - Pennesi, Mark

AU - McGill, Trevor

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AB - PURPOSE. Prospective treatments for age-related macular degeneration and inherited retinal degenerations are commonly evaluated in the Royal College of Surgeons (RCS) rat before translation into clinical application. Historically, retinal thickness obtained through postmortem anatomic assessments has been a key outcome measure; however, utility of this measurement is limited because it precludes the ability to perform longitudinal studies. To overcome this limitation, the present study was designed to provide a baseline longitudinal quantification of retinal thickness in the RCS rat by using spectral-domain optical coherence tomography (SD-OCT). METHODS. Horizontal and vertical linear SD-OCT scans centered on the optic nerve were captured from Long-Evans control rats at P30, P60, P90 and from RCS rats between P17 and P90. Total retina (TR), outer nuclear layer+ (ONL+), inner nuclear layer (INL), and retinal pigment epithelium (RPE) thicknesses were quantified. Histologic sections of RCS retina obtained from P21 to P60 were compared to SD-OCT images. RESULTS. In RCS rats, TR and ONL+ thickness decreased significantly as compared to Long- Evans controls. Changes in INL and RPE thickness were not significantly different between control and RCS retinas. From P30 to P90 a subretinal hyperreflective layer (HRL) was observed and quantified in RCS rats. After correlation with histology, the HRL was identified as disorganized outer segments and the location of accumulated debris. CONCLUSIONS. Retinal layer thickness can be quantified longitudinally throughout the course of retinal degeneration in the RCS rat by using SD-OCT. Thickness measurements obtained with SD-OCT were consistent with previous anatomic thickness assessments. This study provides baseline data for future longitudinal assessment of therapeutic agents in the RCS rat.

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