Role of vitamin A in the healing process of alkali caused corneal injury of adult male albino rat: Histological and immunohistochemical study | ||||
| Journal of Medical Histology | ||||
| Article 6, Volume 1, Issue 1, June 2017, Page 57-68 PDF (2.12 MB) | ||||
| Document Type: Review article | ||||
| DOI: 10.21608/jmh.2017.1020.1014 | ||||
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| Authors | ||||
| Soha Abdelwahab1; Nalaa Abd El-Hameed1; Entesar Saber2; Ahmed Sayed1 | ||||
| 1Histology Department, Faculty of Medicine, Minia University, Minia, Egypt | ||||
| 2Histology Department, Faculty of Medicine, Minia, Egypt, Delegated to Deraya University,New Minia, Egypt. | ||||
| Abstract | ||||
| Background and Aim: Alkali burn of the cornea is considered as the most dangerous injury to the eye. It causes corneal infection, ulceration, perforation, neovascularization (NV) and opacification. Vitamin A is necessary for the normal growth and differentiation of epithelium; it is expected to promote the mechanical repair of corneal epithelial defects The present study is planned to investigate the effect of vitamin A eyegel on wound healing of the corneal alkali burn in rats. Materials and Methods: A total of thirty male albino rats were used. Rats were divided randomly into four groups: Group I,the control group; included three rats, received distilled water. Each of group II, III, IV included 9 rats: their central corneas of the right eyes were injured by contacting them with filter paper saturated with 0.01 m NaOH for 45 seconds. Group II, the non-treated group, injured and received distilled water. Group III, the antibiotic treated group, received antibiotic eye drops (lincomycin hydrochloride eye drops) 3 times per day for 3 days. Group IV, vitamin A treated group, received the same course of antibiotic and vitamin A eye gel (Hypotear gel 1000 IU/g) three times per day. for 3 days. The eyeball was taken out, rapidly fixed and processed for light microscopic, immunohistochemical and morphometric studies. Specimens were taken after 24,48 and 72 hr. post-injury for tissue preparation and study of structural changes and immuno-histochemical analysis using Ki67 (detection of cellular proliferation) and transforming growth factor – beta (TGF-β) which is one of the most critical growth factors in establishing the pathologic lesion after corneal alkali burn. Results: Hematoxylin and eosin stained sections showed rapid healing of corneal ulcer in vitamin A treated group, with absence of neo-vasculariztion and inflammatory cellular infiltration. Immunohistochemical results showed that the use of vitamin A enhance cell proliferation (detected with Ki67) and decrease the expression of TGF-β which is one of the most critical growth factors in establishing the pathological lesion after corneal alkali burn. Conclusions: Vitamin A eye gel helped rapid healing of corneal alkali burn. This effect may be due to its anti-inflammatory effect and stimulation of cell proliferation. | ||||
| Keywords | ||||
| alkali burn; cornea; vitamin A | ||||
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