Insulin-like growth factor 1 promotes neural differentiation of human stem cells from the apical papilla

Yujia Cui; Mingru Bai; Daimo Guo; Yueyi Yang; Haoran Chen; Jianxun Sun; Jing Xie; Xuedong Zhou

doi:10.1016/j.archoralbio.2021.105264

Insulin-like growth factor 1 promotes neural differentiation of human stem cells from the apical papilla

Arch Oral Biol. 2021 Nov:131:105264. doi: 10.1016/j.archoralbio.2021.105264. Epub 2021 Sep 20.

Authors

Yujia Cui¹, Mingru Bai¹, Daimo Guo¹, Yueyi Yang¹, Haoran Chen¹, Jianxun Sun¹, Jing Xie², Xuedong Zhou³

Affiliations

¹ State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China; National Clinical Research Center for Oral Diseases, Sichuan University, Chengdu, China; Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.
² State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China. Electronic address: xiejing2012@scu.edu.cn.
³ State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China; National Clinical Research Center for Oral Diseases, Sichuan University, Chengdu, China; Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China. Electronic address: zhouxd@scu.edu.cn.

PMID: 34598025
DOI: 10.1016/j.archoralbio.2021.105264

Abstract

Objective: Insulin-like growth factor 1 (IGF1) is one of the vital factors in regenerative endodontics. Previous studies have focused on the role of IGF1 in the mineralization of dental tissues. However, the role of IGF1 in the neural differentiation of dental stem cells was little discussed.

Design: IGF1 was overexpressed in human stem cells from the apical papilla (hSCAPs) by lentivirus and knocked down in hSCAPs by small interfering RNA. The neural differentiation level of hSCAPs was investigated histologically by HE staining and Nissl staining after neural induction for 3 days. The expression of proteins was examined by western blot and immunofluorescence.

Results: IGF1 promoted neural differentiation of hSCAPs, more cell processes and Nissl-positive body stained cells. IGF1 overexpression could both promote glial differentiation in hSCAPs, characterized by the increase of S100β and GFAP proteins, and neuronal differentiation, characterized by the increase of βIII-tubulin and functional GAD67/vGLUT1 proteins. Conversely, IGF1 knockdown suppressed both glial and neuronal differentiation. IGF1 activated AKT to regulate the early neural differentiation of hSCAPs.

Conclusions: The results indicate IGF1 could promote neural differentiation of hSCAPs by activating AKT signaling and provide a cue for the candidate of induced neural seeding cells in regenerative endodontics.

Keywords: AKT; IGF1; Neural differentiation; Regenerative endodontics; Stem cells from the apical papilla.

MeSH terms

Cell Differentiation*
Cells, Cultured
Dental Papilla / cytology
Humans
Insulin-Like Growth Factor I*
Lentivirus
Signal Transduction
Stem Cells* / cytology

Substances

Insulin-Like Growth Factor I