scholarly journals Serum-derived exosomes from neurofibromatosis type 1 congenital tibial pseudarthrosis impaired bone by promoting osteoclastogenesis and inhibiting osteogenesis

2020 ◽  
pp. 153537022096273
Author(s):  
Ge Yang ◽  
Hui Yu ◽  
Yaoxi Liu ◽  
Weihua Ye ◽  
Guanghui Zhu ◽  
...  

Treatment of congenital pseudarthrosis of the tibia (CPT) still is full of challenges in pediatric orthopedist. Serum-derived exosomes (SDEs) have been proven to be participated in bone remodeling. However, the molecular changes in SDEs of CPT children and their pathologies have not been elucidated. In this study, SDEs were isolated and purified from CPT patients (CPT-SDEs) associated with neurofibromatosis type 1 (NF1) and normal children (Norm-SDEs). Then we obtained the proteomics profile of SDEs by combining liquid chromatography-tandem mass spectrometry (LC-MS/MS) and tandem mass tag label-based quantitation. In vitro, the efficacy of SDEs on osteoblastic differentiation of MC3T3-E1 cells and osteoclastogenesis ability of RAW264.7 cells were evaluated by quantitative real-time PCR (qRT-PCR) and cytochemical staining. In vivo, we used micro-CT to assess cortical bone mass and trabecular microstructures to reflect the influence of SDEs on bone remodeling after injection into the tail vein of rats. Based on proteomics analysis, 410 differentially expressed proteins, including 289 downregulated proteins and 121 upregulated proteins, were identified in the CPT-SDEs. These proteins have multiple biological functions associated with cellular metabolic processes, catalytic activity, and protein binding, which are important for cell differentiation and proliferation. In vitro, CPT-SDEs decreased the osteogenic differentiation of MC3T3-E1 cells and promoted the osteoclastogenesis of RAW264.7 cells. Injection of CPT-SDEs into the tail vein for two months resulted in bone loss in rats, as indicated by the decrease in trabecular and cortical bone mass. Our findings demonstrated the differences in proteins in SDEs between normal and CPT children with NF1. These differentially expressed proteins in CPT-SDEs contributed to deteriorating trabecular bone microstructures by inhibiting bone formation and stimulating bone resorption. Impact statement Congenital pseudarthrosis of the tibia (CPT) is an uncommon and puzzling disease associated with a high rate of disability. To date, the biological mechanisms related to this disease have largely not been elucidated. In this study, we determined the biological functions of serum-derived exosomes (SDEs) from children with neurofibromatosis type 1 (NF1) associated with CPT (CPT-SDEs) and compared their proteomic profiles with those of SDEs from normal children. Based on proteomics analysis, 410 differentially expressed proteins, including 289 downregulated proteins and 121 upregulated proteins, were identified in the CPT-SDEs. In addition, CPT-SDEs decreased the osteogenic differentiation of MC3T3-E1 cells and promoted the osteoclastogenesis ability of RAW264.7 cells. Moreover, injecting CPT-SDEs into the tail veins led to bone loss in rats, as detected by the reduction in trabecular and cortical bone mass. These findings indicate that CPT-SDEs impair bone quality, which may provide a reasonable explanation for the low bone quality and tibial nonunion in children with NF1 associated with congenital tibial pseudarthrosis.

2008 ◽  
Author(s):  
Jonathan M. Kurss ◽  
Anna E. Craig ◽  
Jennifer Reiter-Purtill ◽  
Kathryn Vannatta ◽  
Cynthia Gerhardt

2011 ◽  
Vol 42 (01) ◽  
Author(s):  
F. Mainberger ◽  
N. Jung ◽  
M. Zenker ◽  
I. Delvendahl ◽  
U. Wahlländer ◽  
...  

2014 ◽  
Vol 45 (S 01) ◽  
Author(s):  
J. Keppler ◽  
A. Fiedler

Sign in / Sign up

Export Citation Format

Share Document