Research On Involvemen Of Notch Signaling In The Formation Of Hypertrophic Scar

Objective To investigate the effects of Notch signaling on scars in a rabbit ear model of hypertrophic scarring.Methods The hypertrophic scar of rabbits' ears was reproduced. The left rabbit's ear wounds as the N-[N-(3,5-difluorophenacetyl-L-alanyl)]-(S)- phenylglycine t-butyl ester (DAPT) treated group were treated intradermally with theγ-secretase inhibitor DAPT to inhibit the activation of Notch at 1, 3, 7 and 14 day time points. The right ears as the control group were treated with normal saline at the same time points. Experimental and control wounds were harvested on days 14, 21, 28 and 35 post wounding, and then examined histologically to quantify hypertrophic index and fibroblasts. The expression of epidermal differentiation markers-keratin 14 (K14), keratin 19 (K19), Involucrin and Notch downstream molecules-P21, P63 were examined and analyzed with immunohistochemistry staining.Results Both hypertrophic index(1.93±0.32,1.82±0.36,1.79±0.25)and number of fibroblasts [(4.08±0.88),(3.30±0.53),(3.19±0.73)×103/mm2]in the DAPT treated group were significantly reduced on days 21, 28 and 35, compared with the control group [2.56±0.29,2.61±0.30,2.58±0.39 and(5.45±0.99),(4.80±1.13),(4.43±1.17)×103/mm2, P<0.01)]. The K19,K14 and P63 increased their expression in the DAPT treated group (28.6%±5.7%,53.1%±4.5%,57.0%±5.8%) relative to the control group (10.1%±2.8%,30.8%±4.9%,16.5%±2.2%, P<0.01) on day 14 post wounding, while the Involucrin and P21 decreased their expression in the DAPT treated group (12.3%±1.9%,11.0%±1.7%) relative to the control group (29.3%±4.6%,44.3%±3.5%, P<0.01).Conclusion Inactivation of Notch signaling will inhibit scar epidermis to over-differentiation, and thereby inhibit proliferation of hypertrophic scars in the rabbit ears.