Bone mesenchymal stem cell-conditioned medium induces the upregulation of Smad6, which inhibits the BMP-4/Smad1/5/8 signaling pathway.

Abstract:

OBJECTIVES:In this study, we aimed to investigate the effect of bone mesenchymal stem cells (BMSCs) conditioned medium on BMP4-induced activation of the Smad signaling pathway during the process of neural stem cells differentiation. METHODS:We designed four experimental groups: (A) control group, (B) BMP-4 treatment group, (C) BMSC-CM group, and (D) BMSC-CM (BMSC-conditioned medium) combined with BMP-4 group. The expression of microtube-associated protein-2 (MAP-2) detected by immunocytochemical staining and western blot. The expression of glial fibrillary acidic protein (GFAP) and BMP receptors (BMPRII and BMPRIa) was determined by western blot, while SMAD1/5/8 and SMAD6 mRNA expression was detected by quantitative real-time polymerase chain reaction (Q-RT-PCR). RESULTS:We found that the expression of microtube-associated protein-2 (MAP-2) increased in group B compared to group A. In group C, the expression of GFAP was increased and the expression of MAP-2 was decreased compared to group A. This phenomenon was weaker in group D. We also demonstrated that BMSC-CM could inhibit the activation of BMP signaling by downregulating the expression of BMPRII and BMPRIa proteins. Moreover, BMSC-CM could upregulate the expression of Smad6 mRNA and inhibit the activation of Smad1/5/8 mRNA. CONCLUSION:These observations suggest that BMSC-CM could neutralize the effect of BMP-4 on the differentiation of NSCs by upregulating the expression of Smad6 and decrease the expression of GFAP by inhibiting the BMP-4-SMAD1/5/8 signaling pathway, conversely increasing the generation of neurons.

journal_name

Neurol Res

journal_title

Neurological research

authors

Fang H,Song P,Shen C,Liu X,Li H

doi

10.1080/01616412.2016.1232549

subject

Has Abstract

pub_date

2016-11-01 00:00:00

pages

965-972

issue

11

eissn

0161-6412

issn

1743-1328

journal_volume

38

pub_type

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