Osteogenic protein-1 attenuates apoptosis and enhances matrix synthesis of nucleus pulposus cells under high-magnitude compression though inhibiting the p38 MAPK pathway.

Abstract:

BACKGROUND:Disc degeneration is correlated with mechanical load. Osteogenic protein-1 (OP-1) is potential to regenerate degenerative disc. OBJECTIVE:To investigate whether OP-1 can protect against high magitude compression-induced nucleus pulposus (NP) cell apoptosis and NP matrix catabolism, and its potential mechanism. METHODS:Porcine discs were cultured in a bioreactor and compressed at a relatively high-magnitude mechanical compression (1.3 MPa at a frequency of 1.0 Hz for 2 hours once per day) for 7 days. OP-1 was added along with the culture medium to investigate the protective effects of OP-1. NP cell apoptosis and matrix biosynthesis were evaluated. Additionally, activity of the p38 MAPK pathway is also analyzed. RESULTS:Compared with the control group, high magnitude compression significantly promoted NP cell apoptosis and decreased NP matrix biosynthesis, reflected by the increase in the number of TUNEL-positive cells and caspase-3 activity, the up-regulated expression of Bax and caspase-3 mRNA and down-regulated expression of Bcl-2 mRNA, and the decreased alcian blue staining intensity and expression of matrix proteins (aggrecan and collagen II). However, OP-1 addition partly attenuated the effects of high magnitude compression on NP cell apoptosis and NP matrix biosynthesis. Further analysis showed that inhibition of the p38 MAPK pathway partly participated in this process. CONCLUSION:OP-1 can attenuate high magnitude compression-induced NP cell apoptosis and promoted NP matrix biosynthesis, and inhibition of the p38 MAPK pathway may participate in this regulatory process. This study provides that OP-1 may be efficacy in retarding mechanical overloading-exacerbated disc degeneration.

journal_name

Biosci Rep

journal_title

Bioscience reports

authors

Fang H,Li X,Shen H,Sun B,Teng H,Li P

doi

10.1042/BSR20180018

subject

Has Abstract

pub_date

2018-02-13 00:00:00

eissn

0144-8463

issn

1573-4935

pii

BSR20180018

pub_type

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