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2015 ; 3
(9
): e520
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Tissue Inhibitor of Metalloproteinase-2 Suppresses Collagen Synthesis in Cultured
Keloid Fibroblasts
#MMPMID26495233
Dohi T
; Miyake K
; Aoki M
; Ogawa R
; Akaishi S
; Shimada T
; Okada T
; Hyakusoku H
Plast Reconstr Surg Glob Open
2015[Sep]; 3
(9
): e520
PMID26495233
show ga
BACKGROUND: Keloids are defined as a kind of dermal fibroproliferative disorder
resulting from the accumulation of collagen. In the remodeling of extracellular
matrix, the balance between matrix metalloproteinases (MMPs) and the tissue
inhibitors of metalloproteinases (TIMPs) is as critical as the proper production
of extracellular matrix. We investigate the role of TIMPs and MMPs in the
pathogenesis of keloids and examine the therapeutic potential of TIMP-2. METHODS:
The expression of TIMPs and MMPs in most inflamed parts of cultured keloid
fibroblasts (KFs) and peripheral normal skin fibroblasts (PNFs) in the same
individuals and the reactivity of KFs to cyclic mechanical stretch were analyzed
by quantitative real-time polymerase chain reaction and enzyme-linked
immunosorbent assay (n = 7). To evaluate the effect of treating KFs with TIMP-2,
collagen synthesis was investigated by quantitative real-time polymerase chain
reaction and enzyme-linked immunosorbent assay, and microscopic analysis was used
to examine the treatment effects of TIMP-2 on ex vivo cultures of keloid tissue
(n = 6). RESULTS: TIMP-2 was downregulated in cultured KFs compared with PNFs in
the same individuals, and the reduction in TIMP-2 was exacerbated by cyclic
mechanical stretch. Administration of TIMP-2 (200 or 300 ng/mL) significantly
suppressed expression of Col1A2 and Col3A1 mRNA and collagen type I protein in
KFs. TIMP-2 also significantly reduced the skin dermal and collagen bundle
thickness in ex vivo cultures of keloid tissue. CONCLUSION: These results
indicated that downregulation of TIMP-2 in KFs is a crucial event in the
pathogenesis of keloids, and the TIMP-2 would be a promising candidate for the
treatment of keloids.