Role of Prion Protein-EGFR Multimolecular Complex During Neuronal Differentiation of Human Dental Pulp-derived Stem Cells

Overview

Journal Prion

Specialty Biochemistry

Date 2018 Apr 13

PMID 29644924

Citations 23

Authors

Stefano Martellucci

Valeria Manganelli

Costantino Santacroce

Francesca Santilli

Luca Piccoli

Maurizio Sorice

Vincenzo Mattei

Affiliations

Soon will be listed here.

Abstract

Cellular prion protein (PrP) is expressed in a wide variety of stem cells in which regulates their self-renewal as well as differentiation potential. In this study we investigated the presence of PrP in human dental pulp-derived stem cells (hDPSCs) and its role in neuronal differentiation process. We show that hDPSCs expresses early PrP at low concentration and its expression increases after two weeks of treatment with EGF/bFGF. Then, we analyzed the association of PrP with gangliosides and EGF receptor (EGF-R) during neuronal differentiation process. PrP associates constitutively with GM2 in control hDPSCs and with GD3 only after neuronal differentiation. Otherwise, EGF-R associates weakly in control hDPSCs and more markedly after neuronal differentiation. To analyze the functional role of PrP in the signal pathway mediated by EGF/EGF-R, a siRNA PrP was applied to ablate PrP and its function. The treatment with siRNA PrP significantly prevented Akt and ERK1/2 phosphorylation induced by EGF. Moreover, siRNA PrP treatment significantly prevented neuronal-specific antigens expression induced by EGF/bFGF, indicating that cellular prion protein is essential for EGF/bFGF-induced hDPSCs differentiation. These results suggest that PrP interact with EGF-R within lipid rafts, playing a role in the multimolecular signaling complexes involved in hDPSCs neuronal differentiation.

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