Milk from Teeth: Dental Stem Cells Can Generate Milk-Producing Cells

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Section of a mammary glad generated by dental epithelial stem cells (green: dent

Section of a mammary glad generated by dental epithelial stem cells (green: dental epithelial cells, blue: nucleus of cells, red: milk specific protein casein). (Image: Institute of Oral Biology, UZH)

Stem cells of the teeth can contribute to the regeneration of non-dental organs, namely mammary glands. According to a new study from researchers at the University of Zurich, dental epithelial stem cells from mice can generate mammary ducts and even milk-producing cells when transplanted into mammary glands. This could be used for post-surgery tissue regeneration in breast cancer patients.

The ability of adult stem cells to generate various tissue-specific cell populations is of great interest in the medical and dental research fields. These cells can replace damaged cells and therefore represent a good alternative to classical medical treatments for tissue regeneration. This may even allow the de novo formation of entire tissues and organs in the future.

Dental stem cells capable of regenerating mammary gland

Dental epithelial stem cells are able to generate all epithelial cell types of the teeth; however, it was not yet clear whether these cells could also produce non-dental cell populations. In a recent paper published in the open access journal Cells, a team of researchers led by Thimios Mitsiadis, professor at the Institute of Oral Biology of the University of Zurich (UZH), has shown for the first time that epithelial stem cells isolated from the continuously growing incisors of young mice are indeed able to form mammary glands in female mice.

In a first set of experiments, after removing all cells of mammary origin, dental epithelial stem cells and mammary epithelial cells were directly injected into the areas where the mammary glands normally develop. The researchers used advanced genetic, molecular and imaging tools that allow the precise follow-up of the transplanted dental stem cells in the mammary gland fat pad of the animals. "The results show that the dental stem cells contribute to mammary gland regeneration, and are able to generate all mammary cell populations and, even more strikingly, milk-producing cells," says Mitsiadis.

This work demonstrates the exceptional plasticity of dental epithelial stem cells to generate not only dental tissues but also other tissues of the body. "These findings represent a major contribution to the understanding of the cellular and molecular mechanisms involved in the regenerative capacity of dental stem cells, and, furthermore, indicate the clinical potential of these specific stem cell populations," Mitsiadis adds.

Stem cell-based therapies could be used for breast tissue regeneration

In a second set of experiments, dental epithelial stem cells were injected alone, without mammary epithelial cells. In this case, the dental stem cells were also able to form small ductal systems consisting of branching rudiments. However, in some cases this resulted in the formation of cysts. "This plasticity might be unique for dental epithelial stem cells, since all other non-mammary epithelial cells examined so far have never shown the ability to generate mammary ducts without the support of mammary epithelial cells," states co-author Pierfrancesco Pagella from the Institute of Oral Biology.

One of the most severe pathological conditions is breast cancer, which is often treated with surgery. "Our discovery that dental epithelial stem cells are able to replace cells from the mammary gland opens up new paths for developing stem cell-based therapies that could be used for breast regeneration in the future," says Thimios Mitsiadis.

Literature:

Lucia Jimenez-Rojo, Pierfrancesco Pagella, Hidemitsu Harada, Thimios A. Mitsiadis. Dental Epithelial Stem Cells as a Source for Mammary Gland Regeneration and Milk Producing Cells In Vivo. Cells. 22 October 2019. DOI: 10.3390/cells8101302