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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

Authors Wang R, Chen J, Zhang Z, Cen Y

Received 3 May 2015

Accepted for publication 22 May 2015

Published 28 August 2015 Volume 2015:9 Pages 4979—4988


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 3

Editor who approved publication: Prof. Dr. Wei Duan

Ru Wang, Junjie Chen, Zhenyu Zhang, Ying Cen

Department of Burn and Plastic Surgery, West China Hospital of Sichuan University, Chengdu, People’s Republic of China

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-β1 (TGF-β1)/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-β1, interleukin-1β, 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-β1, and interleukin-1β 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.

Keywords: pathological scar, chymase, angiotensin II, therapy

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