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Published on: September 14, 2021
TGF-ß1 antisense impacts the SMAD signalling system in fibroblasts from keloid scars
Gregor M Bran1, Ulrich J Sommer, Ulrich R Goessler
1Department of Otolaryngology, University Hospital of Mannheim, Theodor-Kutzer-Ufer 1-3, D-68167 Mannheim, Germany. gregor.bran@umm.de
Aim:
To identify the effect of a TGF-β1 antisense treatment of keloid fibroblasts on the SMAD signalling system.
Material And Methods:
In this cross-sectional study, keloid and adjacent healthy tissue was harvested from 9 patients with keloid scars after otoplasty. Keloid fibroblasts were placed in monolayer cultures. Expression of SMAD2, -3, -4, -6, and SMURF2 were analysed by immunohistochemistry. Analysis of treatment with antisense oligonucleotides was conducted by immunohistochemistry, and RT-PCR.
Results:
Immunohistochemical investigation demonstrated increased expression of SMAD2, -3 and -4, and decreased expression of SMURF2. TGF-β1 antisense therapy significantly down-regulated SMAD2 and SMAD4, up-regulated SMURF2 and showed no effect on SMAD3 and SMAD6.
Conclusion:
TGF-β1 led to elevated levels of the SMAD signalling cascade, indicating an abnormal sensitivity of keloid-derived fibroblasts to this cytokine. Abrogation correlated with potential suppression of the fibro-proliferative progress. There is growing evidence for an abnormal response to this cytokine in the intracellular signal transduction in keloid-derived fibroblasts.
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