Small RNAs Take on the Big Task of Helping Skin Wounds Heal Better and Faster with Minimal Scarring

New findingsopens in new tab/window in The American Journal of Pathologyopens in new tab/window, published by Elsevier, report that a class of small RNAs (microRNAs), microRNA-29, can restore normal skin structure rather than producing a wound closure by a connective tissue (scar). Any improvement of normal skin repair would benefit many patients affected by large-area or deep wounds prone to dysfunctional scarring.

Because the burden of non-healing wounds is so significant, it is sometimes called a “silent pandemic.” Worldwide, costs associated with wound care are expected to reach US$15 to 22 billion per year by 2024, exceeding the cost of managing obesity-related health problems in some parts of the world.

Lead investigator Svitlana Kurinna, PhD, Division of Cell Matrix Biology and Regenerative Medicine, FBMH, University of Manchester, explained, “We had data showing that microRNAs can regulate skin growth. microRNAs do not code for proteins, so it wasn’t clear exactly how such small molecules can make changes to the skin. We therefore studied underlying mechanisms that could be targeted to improve cutaneous wound healing.”

The molecular events during early wound healing stages of inflammation and tissue formation have been well described using single cell sequencing and proteomic approaches. microRNAs are important factors in healing and may regulate functions in skin repair; however, the mechanisms underlying tissue remodeling are unclear. Scientists studying wound healing in microRNA-29 gene knockout transgenic mice suggest that the release of microRNA-29 targets promotes wound healing by regulating skin regeneration by binding long RNAs coding for structural protein laminin C2 (LAMC2) of the skin. This restores the normal skin structure rather than creating a connective tissue scar.

In the current study, researchers noted that wild type wounded mice healed quite well, but the skin of transgenic mice devoid of microRNA-29 regenerated even better. To understand the reasons, they conducted in-depth microscopic analysis of the transgenic wounds. They observed deposition of LAMC2—usually found in one of the skin layers in wild mice—around blood vessels inside the wounds of microRNA-29–deficient transgenic mice. This observation indicates that microRNA-29 may be inhibiting the expression of LAMC2, and deletion in the transgenic mice relieved the inhibition, which resulted in faster wound healing.

Dr. Kurinna noted, “These processes are likely mediated by microRNA-29 target microRNAs released upon removal of microRNA-29 to improve cell matrix adhesion. These results further suggest a link between LAMC2, improved angiogenesis, and re-epithelialization. We had expected a different change in skin regeneration; we thought the removal of microRNA-29 would help outer layers of the skin to grow faster, but it was the deep matrix of the wound that showed an improvement.“

These findings in both mice and humans demonstrate the role of microRNA-29 in epidermal repair and suggest that the release of microRNA-29 targets, particularly LAMC2, promotes wound healing. The inhibition of microRNA-29 and/or overexpression of LAMC2 may be a new and effective strategy for improving wound healing.

Dr Kurinna concluded, “Our findings are of particular interest because they show the mechanism to restore normal skin structure rather than a wound closure by a connective tissue (scar). Any improvement of normal skin repair would therefore help many patients affected by large-area or deep wounds prone to dysfunctional scarring.”

Notes for editors

The article is “Release of miR-29 Target Laminin C2 Improves Skin Repair,” by Connor J. Robinson, Lalitha Thiagarajan, Rebecca Maynard, Maneesha Aruketty, Jeremy Herrera, Lewis Dingle, Adam Reid, Jason Wong, Heng Cao, James Dooley, Adrian Liston, Daniela Müllhaupt, Paul Hiebert, Hayley Hiebert, and Svitlana Kurinna (https://doi.org/10.1016/j.ajpath.2023.11.002opens in new tab/window). It appears in The American Journal of Pathology, volume 194, issue 2 (February 2024), published by Elsevier.

The article is openly available at https://ajp.amjpathol.org/article/S0002-9440(23)00422-4/fulltextopens in new tab/window.

Full text of the article is also available to credentialed journalists upon request. Contact Eileen Leahy at +1 732 406 1313 or [email protected]opens in new tab/window to request a PDF of the article. To request an interview with the authors please contact Mike Addelman, News and Media Relations Officer, University of Manchester, at +44 7717 881567 (mobile) or [email protected]opens in new tab/window.

This project was funded by the Medical Research Council Career Development Award, MR/P009700/1.

About The American Journal of Pathology

The American Journal of Pathologyopens in new tab/window, official journal of the American Society for Investigative Pathologyopens in new tab/window, published by Elsevier, seeks high-quality original research reports, reviews, and commentaries related to the molecular and cellular basis of disease. The editors will consider basic, translational, and clinical investigations that directly address mechanisms of pathogenesis or provide a foundation for future mechanistic inquiries. Examples of such foundational investigations include data mining, identification of biomarkers, molecular pathology, and discovery research. High priority is given to studies of human disease and relevant experimental models using molecular, cellular, and organismal approaches. https://ajp.amjpathol.orgopens in new tab/window

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