Histopathology of neovascular tissue from eyes with proliferative diabetic retinopathy after intravitreal bevacizumab injection

Ri Ichiro Kohno, Yasuaki Hata, Yasutaka Mochizuki, Ryoichi Arita, Shuhei Kawahara, Takeshi Kita, Masanori Miyazaki, Toshio Hisatomi, Yasuhiro Ikeda, Lloyd Paul Aiello, Tatsuro Ishibashi

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51 Citations (Scopus)

Abstract

Purpose: To examine the histopathologic effect of a single intravitreal injection of bevacizumab on newly formed vessels in eyes with proliferative diabetic retinopathy (PDR). Design: Interventional case series and laboratory investigation. Methods: Two days after intravitreal injection of bevacizumab (1.25 mg/eye), pars plana vitrectomy or trabeculectomy was performed for the treatment of PDR or neovascular glaucoma (NVG) associated with PDR. Ten surgically removed preretinal proliferative tissues and 6 deep scleral flaps containing trabecular meshwork were fixed in 2% glutaraldehyde or 4% paraformaldehyde and were subjected to transmission electron microscopic analysis, immunohistochemical analysis, and terminal deoxyuridiine triphosphate (dUTP) nick-end labeling staining. Two surgically removed preretinal proliferative tissues and 2 deep scleral flaps from patients with PDR and NVG, but without preoperative intravitreal injection of bevacizumab (IVB), served as controls. Results: In control tissues, vascular endothelial cells possessed many fenestrations and were accompanied by pericytes. Apoptotic vascular endothelial cells frequently were observed in tissue after intravitreal injection of bevacizumab, whereas they were not observed in control tissues. Additionally, no apparent fenestration was observed in newly formed vessels from either proliferative tissue or trabecular meshwork after intravitreal injection of bevacizumab. In both PDR and NVG tissues after intravitreal injection of bevacizumab, overexpression of smooth muscle actin was observed in newly formed vessels, suggesting that the treatment may have increased pericytes on the vasculature as compared with control tissue. Conclusions: Intravitreal injection of bevacizumab may induce changes in immature, newly formed vessels of PDR or NVG tissue, leading to endothelial apoptosis with vascular regression, while inducing normalization of premature vessels by increasing pericyte coverage and reducing vessel fenestration.

Original languageEnglish
Pages (from-to)223-229.e1
JournalAmerican journal of ophthalmology
Volume150
Issue number2
DOIs
Publication statusPublished - Aug 2010

All Science Journal Classification (ASJC) codes

  • Ophthalmology

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    Kohno, R. I., Hata, Y., Mochizuki, Y., Arita, R., Kawahara, S., Kita, T., Miyazaki, M., Hisatomi, T., Ikeda, Y., Aiello, L. P., & Ishibashi, T. (2010). Histopathology of neovascular tissue from eyes with proliferative diabetic retinopathy after intravitreal bevacizumab injection. American journal of ophthalmology, 150(2), 223-229.e1. https://doi.org/10.1016/j.ajo.2010.03.016