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Abstract #13372 Published in IGR 8-1

Role of angiotensin II receptor subtypes in conjunctival wound healing

Mizoue S; Iwai M; Ide A; Suzuki J; Horiuchi M; Shiraishi A; Ohashi Y
Current Eye Research 2006; 31: 129-136


PURPOSE: To investigate the role of angiotensin II (Ang II) receptor subtypes in subconjunctival injury. METHODS: A wound-healing model was developed by subconjunctival blunt dissection in male wild-type, AT1a receptor-deficient (AT1a KO) and AT2 receptor-deficient (AT2 KO) mice. Collagen deposition and cell infiltration were evaluated histologically. Expression of collagen, matrix metalloproteinase (MMP), and tissue inhibitor of metalloproteinase-1 (TIMP-1) were determined by real-time PCR. RESULTS: Subconjunctival injury increased the infiltration of inflammatory cells, collagen deposition in the subconjunctival space, and the expression of collagen type I and type III, TIMP-1 and MMP2. In AT1a KO mice, collagen deposition, cell infiltration, and expression of collagen and TIMP-1 were inhibited, but MMP2 expression was enhanced. In contrast, in AT2 KO mice, the increase in collagen deposition, cell infiltration, and expression of collagen and TIMP-1 were further enhanced. CONCLUSIONS: These results indicate that AT1a and AT2 receptor stimulation may in addition to other mechanisms be antagonistically involved in the wound-healing process after subconjunctival injury.

Dr. S. Mizoue, Department of Molecular and Cellular Biology, Division of Medical Biochemistry and Cardiovascular Biology, Ehime University School of Medicine, Ehime, Japan


Classification:

12.8.10 Woundhealing antifibrosis (Part of: 12 Surgical treatment > 12.8 Filtering surgery)



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