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2016 ; 7
(ä): 1-6
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Knockdown of asporin affects transforming growth factor-?1-induced matrix
synthesis in human intervertebral annulus cells
#MMPMID30035083
Jiang X
; Wu CA
; Wang Y
; Shi KJ
; Jiang XZ
; Zheng S
; Tian W
J Orthop Translat
2016[Oct]; 7
(ä): 1-6
PMID30035083
show ga
BACKGROUND/OBJECTIVE: Asporin is associated with osteoarthritis and lumbar disk
degeneration. Previous studies in chondrocytes showed that asporin can bind to
transforming growth factor-?1 (TGF-?1) and downregulate matrix biosynthesis.
However, this has not been studied in intervertebral disk (IVD) cells. This study
aimed to inspect the expression of asporin under TGF-?1 stimulation and its
effect on TGF-?1-induced matrix biosynthesis in human intervertebral annulus
cells. METHODS: Human intervertebral annulus cells were obtained from the
pathological region of IVD in eight patients. After primary culture and
redifferentiation in alginate beads, cells were reseeded and treated with
different concentrations (5 ng/mL, 10 ng/mL, and 15 ng/mL) of TGF-?1 for up to 24
hours. Total RNA extracted from the cells and those with asporin knockdown were
subjected to real-time polymerase chain reaction analysis to examine the
expression of asporin and extracellular matrix genes. RESULTS: TGF-?1 stimulation
induces asporin transcription significantly in a dose- and time-dependent manner.
Knockdown of endogenous asporin leads to the upregulated expression of collagen
II alpha 1 and aggrecan. CONCLUSION: Our results have verified a functional
feedback loop between TGF-?1 and asporin in human intervertebral annulus cells
indicating that TGF-?1-induced annulus matrix biosynthesis can be significantly
upregulated by knockdown of asporin. Therefore, asporin could be a potential new
therapeutic target and inhibition of asporin could be adopted to enhance the
anabolic effect of TGF-?1 in human intervertebral annulus cells in degenerative
IVD diseases.