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Role of chymase in the local renin-angiotensin system in keloids: inhibition of chymase may be an effective therapeutic approach to treat keloids #MMPMID26357464
Wang R; Chen J; Zhang Z; Cen Y
Drug Des Devel Ther 2015[]; 9 (ä): 4979-88 PMID26357464show ga
Background: Histologically, keloids contain excess fibroblasts and an overabundance of dermal collagen. Recently, it was reported that chymase induced a profibrotic response via transforming growth factor-?1 (TGF-?1)/Smad activation in keloid fibroblasts (KFs). However, the role of chymase in the local renin-angiotensin system (RAS) in keloids has not been elucidated. This study aims to determine whether chymase plays an important role in the local RAS in keloids. Methods: We compared the expression and activity of chymase in keloids and normal skin tissues using Western blotting and radioimmunoassay, and studied the expression of TGF-?1, interleukin-1?, collagen I, hydroxyproline, and angiotensin II in KFs after chymase and inhibitors? treatment. Results: The results revealed an increased activity of chymase in keloid tissues, and that chymase enhanced the expression of angiotensin II, collagen I, TGF-?1, and interleukin-1? in KFs. Blockade of the chymase pathway involved in the local RAS lowered the expression of these signaling factors. Conclusion: This research suggests that inhibition of chymase might be an effective therapeutic approach to improve the clinical treatment of keloids.