The super super-healing MRL mouse strain

Abstract

The Murphy Roths Large (MRL/MpJ) mice provide unique insights into wound repair and regeneration. These mice and the closely related MRL/MpJ-Fas^lpr/J and Large strains heal wounds made in multiple tissues without production of a fibrotic scar. The precise mechanism of this remarkable ability still eludes researchers, but some data has been generated and insights are being revealed. For example, MRL cells reepithelialize over dermal wound sites faster than cells of other mouse strains. This allows a blastema to develop beneath the protective layer. The MRL mice also have an altered basal immune system and an altered immune response to injury. In addition, MRL mice have differences in their tissue resident progenitor cells and certain cell cycle regulatory proteins. The difficulty often lies in separating the causative differences from the corollary differences. Remarkably, not every tissue in these mice heals scarlessly, and the specific type of wound and priming affect regeneration ability as well. The MRL/MpJ, MRL/MpJ-Fas^lpr/J, and Large mouse strains are also being investigated for their autoimmune characteristic. Whether the two phenotypes of regeneration and autoimmunity are related remains an enigma.

Keywords

MRL / wound healing / regeneration

References

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ACKNOWLEGMENTS

I thank Susan T. Varghese, Jenan Holley-Cuthrell, Ann F. Kuenster, and Nathan W. Roberts for their help with the writing of this review and preliminary data. This work was supported by a National Institutes of Health Grant (RO1 HL 102322-01A1).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg