The effect of amphiphilic siloxane oligomers on fibroblast and keratinocyte proliferation and apoptosis

Lynam, Emily, Xie, Yan, Loli, Bree, Dargaville, Tim R., Leavesley, David I., George, Graeme, & Upton, Zee (2010) The effect of amphiphilic siloxane oligomers on fibroblast and keratinocyte proliferation and apoptosis. Journal of Biomedical Materials Research Part A, 95A(2), pp. 620-631.

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The formation of hypertrophic scars is a frequent medical outcome of wound repair and often requires further therapy with treatments such as Silicone Gel Sheets (SGS) or apoptosis-inducing agents, including bleomycin. Although widely used, knowledge regarding SGS and their mode of action is limited. Preliminary research has shown that small amounts of amphiphilic silicone present in SGS have the ability to move into skin during treatment. We demonstrate herein that a commercially available analogue of these amphiphilic siloxane species, the rake copolymer GP226, decreases collagen synthesis upon exposure to cultures of fibroblasts derived from hypertrophic scars (HSF). By size exclusion chromatography, GP226 was found to be a mixture of siloxane species, containing five fractions of different molecular weight. By studies of collagen production, cell viability and proliferation, it was revealed that a low molecular weight fraction (fraction IV) was the most active, reducing the number of viable cells present following treatment and thereby reducing collagen production as a result. Upon exposure of fraction IV to human keratinocytes, viability and proliferation was also significantly affected. HSF undergoing apoptosis after application of fraction IV were also detected via real-time microscopy and by using the TUNEL assay. Taken together, these data suggests that these amphiphilic siloxanes could be potential non-invasive substitutes to apoptotic-inducing chemical agents that are currently used as scar treatments.

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5 citations in Scopus
4 citations in Web of Science®
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ID Code: 33129
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: Fibroblast, Keratinocytes, Silicone, Hypertrophic Scar, Apoptosis
DOI: 10.1002/jbm.a.32844
ISSN: 1549-3296
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomaterials (090301)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute of Health and Biomedical Innovation
Deposited On: 14 Jul 2010 22:12
Last Modified: 10 Jul 2017 23:01

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