Lycium barbarum polysaccharides rescue neurodegeneration in an acute ocular hypertension rat model under pre- and posttreatment conditions

Yamunadevi Lakshmanan, Francisca Siu Yin Wong, Wing Yan Yu, Serena Zhe Chuang Li, Kai Yip Choi, Kwok Fai So, Henry Ho Lung Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)

Abstract

PURPOSE. To investigate the posttreatment neuronal rescue effects of Lycium barbarum polysaccharides (LBP) in an acute ocular hypertensive (AOH) model. METHODS. Intraocular pressure (IOP) was elevated manometrically to 80 mm Hg (AOH) or 15 mm Hg (sham) for 120 minutes in adult Sprague-Dawley rats. Five experimental groups were considered: Three AOH groups were pretreated with PBS (vehicle) (n = 9), LBP 1 mg/kg (n = 8), or 10 mg/kg (n = 13), and one AOH group was posttreated with LBP 10 mg/kg (n = 8), once daily. The sham cannulation group (n = 5) received no treatment. Pretreatments commenced 7 days before and posttreatment 6 hours after AOH, and continued up through postcannulation day 28. All the animals underwent optical coherence tomography and electroretinogram measurements at baseline and postcannulation days 10 and 28. The ganglion cell layer (GCL) densities were quantified at day 28. RESULTS. Both inner retinal layer thickness (IRLT) and positive scotopic threshold response (pSTR) underwent significant reduction (≥50% of thickness and amplitude) in the vehicle group (P < 0.05). Pretreatment with LBP 1 and 10 mg/kg retained 77 ± 11% and 89 ± 8% of baseline IRLT, respectively, and preserved pSTR functions. The posttreatment group showed a significant reduction in IRLT (-35 ± 8%, P < 0.001) and pSTR (~48% of baseline, P < 0.001) on day 10. By day 28, there was an improvement in functional pSTR (~72% of baseline, P > 0.05) with no significant further thinning (-40 ± 8%, P = 0.15) relative to day 10. GCL density was reduced in vehicle control (P = 0.0001), but did not differ between sham and pre- and posttreated AOH groups. CONCLUSIONS. The rescue effect of LBP posttreatment was observed later, which arrested the secondary degeneration and improved the retinal function.

Original languageEnglish
Pages (from-to)2023-2033
Number of pages11
JournalInvestigative Ophthalmology and Visual Science
Volume60
Issue number6
DOIs
Publication statusPublished - May 2019

Keywords

  • Acute ocular hypertension
  • Lycium barbarum polysaccharides
  • Neuronal rescue
  • Posttreatment
  • Rat model

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

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