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Dose-dependent pro- or anti-scar-preventing responses of freeze-dried amniotic membrane extract in relation to suppression of connective tissue growth factor and α-smooth muscle actin

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Abstract

Purpose

Dose-dependent pro- or anti-scar-preventing effects of amniotic membrane extract (AME) are unclear. This study investigated the dose-dependent effects of freeze-dried AME on connective tissue growth factor (CTGF) and α-smooth muscle action (α-SMA) (key determinants of excessive scarring) expression in an attempt to develop medication for scarless wound healing.

Methods

The inhibitory effect of freeze-dried AME on α-SMA was visualized through immunofluorescence confocal microscopy. The suppressive effect of 10 different concentrations of AME (0.0025–0.25 µg/mL) on CTGF and α-SMA was determined, and rates of collagen lattice contraction were measured.

Results

AME inhibited the trans-differentiation of fibroblasts to myofibroblasts, a hallmark of scar formation. AME downregulated CTGF and α-SMA in a dose-dependent manner; supplementation of 0.0175 µg/mL of AME in cell culture media downregulated CTGF (by 49%; p < 0.05) and α-SMA (by 33%; p < 0.05) relative to control values, the effect saturating with a subsequent increase in AME levels to 0.025 µg/mL. Collagen lattice contraction was maximally inhibited (75 ± 8%) upon treatment with 0.0175 µg/mL AME relative to the control (44 ± 6%).

Conclusion

AME downregulates α-SMA and inhibits the trans-differentiation of fibroblasts to myofibroblasts in a dose-dependent manner. Treatment of cells with high AME concentrations retained high α-SMA concentration levels. A delicate balance between the wound healing properties and pro-fibrotic abilities of AME should be considered for selecting an appropriate therapeutic dose.

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Change history

  • 08 May 2021

    The original version of this article has been revised: The second author's name has been corrected.

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Acknowledgements

This work was supported in part by the Duksung Women’s University Research Grants 2018. We thank Professor Kyung Chan Park, Department of Dermatology, School of Medicine, Seoul National University for providing human primary dermal fibroblasts and his scientific inputs.

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Correspondence to Ae-Ri Cho Lee.

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All authors (M. Kang and A.-R. Cho Lee) declare no conflict of interest with any person or any organization.

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The original version of this article has been revised: The second author’s name has been corrected.

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Kang, M., Cho Lee, AR. Dose-dependent pro- or anti-scar-preventing responses of freeze-dried amniotic membrane extract in relation to suppression of connective tissue growth factor and α-smooth muscle actin. J. Pharm. Investig. 51, 327–336 (2021). https://doi.org/10.1007/s40005-021-00518-y

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