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Photodynamic therapy inhibits the formation of hypertrophic scars in rabbit ears by regulating metalloproteinases and tissue inhibitor of metalloproteinase‐1
Author(s) -
Wang Q.,
Dong Y.,
Geng S.,
Su H.,
Ge W.,
Zhen C.
Publication year - 2014
Publication title -
clinical and experimental dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 78
eISSN - 1365-2230
pISSN - 0307-6938
DOI - 10.1111/ced.12265
Subject(s) - matrix metalloproteinase , fibroblast , tissue inhibitor of metalloproteinase , extracellular matrix , metalloproteinase , hypertrophic scar , photodynamic therapy , wound healing , scars , pathogenesis , pathology , medicine , cancer research , matrix metalloproteinase inhibitor , chemistry , immunology , biochemistry , in vitro , organic chemistry
Summary Background Hypertrophic scarring ( HS ) is a chronic skin condition, and inhibition of normal fibroblast ageing plays an important role in its pathogenesis. Photodynamic therapy ( PDT ) is known to inhibit synthesis of collagen proliferation in blood vessels and fibroblasts in scar tissue, with no significant adverse reactions reported. Aim To investigate the effect of PDT in the rabbit ear model of HS , and the specific mechanism of action of PDT . Methods We assessed the clinical and histopathological appearance of rabbit ears with HS with and without PDT. In addition, mRNA levels of matrix metalloproteinase (MMP)‐2, MMP‐3, MMP‐9 and tissue inhibitor of metalloproteinase (TIMP)‐1, and concentration of β‐galactose were all measured to confirm cell senescence. Results Our data indicate that PDT can accelerate fibroblast ageing by increasing the ratio of MMP s to TIMP , in addition to promoting degradation of collagen and extracellular matrix, thereby inhibiting HS formation. These effects lasted for up to 60 days, and induced no significant adverse local or systemic reactions. The efficacy of the treatment can be maximized by applying an appropriately high concentration of aminolaevulinic acid. Conclusions PDT can induce senescence in fibroblasts, and may constitute a useful treatment for pathological scarring.