Mesenchymal Stem Cells Antagonize IFN-Induced Proinflammatory Changes and Growth Inhibition Effects via Wnt/β-Catenin and JAK/STAT Pathway in Human Outer Root Sheath Cells and Hair Follicles.

Yu-Jin Lee,Jung-Eun Kim,Hye-Ree Park,Song-Hee Park,Hoon Kang,Young Lee

doi:10.3390/ijms22094581

Abstract

Mesenchymal stem cell therapy (MSCT) has been shown to be a new therapeutic option for treating alopecia areata (AA). Outer root sheath cells (ORSCs) play key roles in maintaining the hair follicle structure and supporting the bulge area. In human ORSCs (hORSCs), the mechanism for this process has not been extensively studied. In this study, we aimed to examine the influence of human hematopoietic mesenchymal stem cells (hHMSCs) in the hORSCs in vitro model of AA and determine the mechanisms controlling efficacy. Interferon-gamma (IFN-γ) pretreatment was used to induce an in vitro model of AA in hORSCs. The effect of MSCT on the viability and migration of hORSCs was examined using co-cultures, the MTT assay, and migration assays. We investigated the expression of molecules related to the Wnt/β-catenin pathway, JAK/STAT pathway, and growth factors in hHMSC-treated hORSCs by reverse transcription-polymerase chain reaction (RT-PCR) and Western blot analyses. hHMSCs increased hORSC viability and migration when they were co-cultured. hHMSCs reverted IFN-γ-induced expression—including NLRP3, ASC, caspase-1, CXCL-9 through 11, IL-1β, and IL-15—and upregulated several growth factors and hair stem cell markers. hHMSCs activated several molecules in the Wnt/β-catenin signaling pathway, such as in the Wnt families, β-catenin, phosphorylated GSK-3β and cyclin D1, and suppressed the expression of DKK1 induced by IFN-γ in hORSCs. hHMSCs suppressed the phosphorylation of JAK1 to 3, STAT1, and STAT3 compared to the controls and IFN-γ-pretreated hORSCs. These results demonstrate that hHMSCs increased hORSC viability and migration in the in vitro AA model. Additionally, MSCT definitely stimulated anagen survival and hair growth in an HF organ culture model. MSCT appeared to be associated with the Wnt/β-catenin and JAK/STAT pathways in hORSCs.

Highlights

We examined whether Mesenchymal stem cell therapy (MSCT) could increase the cell viability of human ORSCs (hORSCs)
The results showed that treatment with hematopoietic mesenchymal stem cells (hHMSCs) enhanced hORSC viability at 24 h and 48 h
While IFNγ significantly decreased the cell viability of hORSCs, when co-cultured with hHMSCs, hORSC viability increased up to ~130% compared to the controls

Summary

Introduction

Alopecia areata (AA) is an autoimmune disease that targets hair follicles (HFs) during the anagen stage and is primarily caused by the disruption of immune privilege. AA is characterized by unexpected hair loss [3,4]. Even though AA is not a serious, life-threatening illness, it can have psychological consequences, including high levels of depression and anxiety [1,2]. The pathological mechanisms of chronic AA and alopecia totalis or alopecia universalis hair loss are not fully understood. Many patients with alopecia totalis and alopecia totalis show tolerance to conventional treatments [5]

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