Abstract

Silicone oil (SO) is an intraocular surgical adjuvant that reduces the surgical complications in refractory retinal diseases, although membrane and cellular proliferation is often seen even in SO-filled eyes. We hypothesised that the fluid in the space between the SO and the retina, named the “sub-silicone oil fluid (SOF)”, enhances these biological responses. We proposed a safe method for SOF extraction. We also analysed inflammatory cytokine expressions and SOF osmotic pressures from eyes with rhegmatogenous retinal detachment (RRD), proliferative diabetic retinopathy (PDR), proliferative vitreoretinopathy (PVR) and macular hole-associated retinal detachment (MHRD). Interleukin (IL)-10, IL-12p40, IL-6, monocyte chemotactic protein-1, and vascular endothelial growth factor (VEGF) in the SOF with PVR were significantly higher than in those with RRD or MHRD. Fibroblast growth factor-2, IL-10, IL-12p40, IL-8, VEGF, and transforming growth factor beta 1 levels in eyes with exacerbated PDR indicated a significantly higher expression than those with simple PDR. IL-6 and tumour necrosis factor alpha in eyes with exacerbated PVR demonstrated a significantly higher expression than in those with simple PVR. However, there was no difference in SOF osmotic pressure between group of each disease. These studies indicate that disease-specific SOF is a significant reflection of disease status.

Highlights

  • Silicone oil (SO) is an intraocular surgical adjuvant that reduces the surgical complications in refractory retinal diseases, membrane and cellular proliferation is often seen even in SO-filled eyes

  • We highlighted the importance of silicone oil fluid (SOF) in demonstrating the disease status in patients with refractory retinal diseases

  • Lewis et al and Zilis et al reported that SO enhanced peri-silicone proliferation and formation of the preretinal membrane after using SO for advanced PVR16, 17

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Summary

Introduction

Silicone oil (SO) is an intraocular surgical adjuvant that reduces the surgical complications in refractory retinal diseases, membrane and cellular proliferation is often seen even in SO-filled eyes. We analysed inflammatory cytokine expressions and SOF osmotic pressures from eyes with rhegmatogenous retinal detachment (RRD), proliferative diabetic retinopathy (PDR), proliferative vitreoretinopathy (PVR) and macular hole-associated retinal detachment (MHRD). In 2004, Asaria et al.[15] named the fluid “retro-oil fluid” and they studied cytokine levels from 13 eyes with PVR While their idea was very innovative, their sample size was small and only three cytokine parameters were reviewed: fibroblast growth factor-2 (FGF-2), interleukin (IL)-6 and transforming growth factor-β2 (TGFβ2). We examined multiple inflammatory cytokine levels and osmotic pressures of SOF and of original vitreous fluid from the same eyes with representative severe retinal diseases including RD, PVR, PDR, and macular hole-associated retinal detachment (MHRD)

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