Stem cell properties of human clonal salivary gland stem cells are enhanced by three-dimensional priming culture in nanofibrous microwells.

Abstract:

BACKGROUND:Three-dimensional (3D) cultures recapitulate the microenvironment of tissue-resident stem cells and enable them to modulate their properties. We determined whether salivary gland-resident stem cells (SGSCs) are primed by a 3D spheroid culture prior to treating irradiation-induced salivary hypofunction using in-vitro coculture and in-vivo transplant models. METHODS:3D spheroid-derived SGSCs (SGSCs3D) were obtained from 3D culture in microwells consisting of a nanofiber bottom and cell-repellent hydrogel walls, and were examined for salivary stem or epithelial gene/protein expression, differentiation potential, and paracrine secretory function compared with monolayer-cultured SGSCs (SGSCs2D) in vitro and in vivo. RESULTS:SGSCs3D expressed increased salivary stem cell markers (LGR5 and THY1) and pluripotency markers (POU5F1 and NANOG) compared with SGSCs2D. Also, SGSCs3D exhibited enhanced potential to differentiate into salivary epithelial cells upon differentiation induction and increased paracrine secretion as compared to SGSCs2D. Wnt signaling was activated by 3D spheroid formation in the microwells and suppression of the Wnt/β-catenin pathway led to reduced stemness of SGSCs3D. Enhanced radioprotective properties of SGSCs3D against radiation-induced salivary hypofunction was confirmed by an organotypic 3D coculture and in-vivo transplantation experiments. CONCLUSION:The 3D spheroid culture of SGSCs in nanofibrous microwells promotes stem cell properties via activation of Wnt signaling. This may contribute to SGSC priming prior to regenerative therapy to restore salivary hypofunction after radiotherapy.

journal_name

Stem Cell Res Ther

authors

Shin HS,Lee S,Hong HJ,Lim YC,Koh WG,Lim JY

doi

10.1186/s13287-018-0829-x

subject

Has Abstract

pub_date

2018-03-22 00:00:00

pages

74

issue

1

issn

1757-6512

pii

10.1186/s13287-018-0829-x

journal_volume

9

pub_type

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