In:
Journal of Pineal Research, Wiley, Vol. 56, No. 1 ( 2014-01), p. 62-70
Abstract:
Intramembranous ossification and endochondral ossification are two ways through which bone formation and fracture healing occur. Accumulating amounts of evidence suggests that melatonin affects osteoblast differentiation, but little is known about the effects of melatonin on the process of chondrogenic differentiation. In this study, the effects of melatonin on human mesenchymal stem cells ( MSC s) undergoing chondrogenic differentiation were investigated. Cells were induced along chondrogenic differentiation via high‐density micromass culture in chondrogenic medium containing vehicle or 50 n m melatonin. Histological study and quantitative analysis of glycosaminoglycan ( GAG ) showed induced cartilage tissues to be larger and richer in GAG , collagen type II and collagen type X in the melatonin group than in the untreated controls. Real‐time RT ‐ PCR analysis demonstrated that melatonin treatment significantly up‐regulated the expression of the genes involved in chondrogenic differentiation, including aggrecan ( ACAN ), collagen type II ( COL2A1 ), collagen type X ( COL10A1 ), SRY (sex‐determining region Y)‐box 9 ( SOX9 ), runt‐related transcription factor 2 ( RUNX2 ) and the potent inducer of chondrogenic differentiation, bone morphogenetic protein 2 ( BMP2 ). And the expression of melatonin membrane receptors ( MT ) MT 1 and MT 2 were detected in the chondrogenic‐induced‐ MSC s by immunofluorescence staining. Luzindole, a melatonin receptor antagonist, was found to partially block the ability of melatonin to increase the size and GAG synthesis of the induced cartilage tissues, as well as to completely reverse the effect of melatonin on the gene expression of ACAN , COL2A1 , COL10A1 , SOX9 and BMP2 after 7 days of differentiation. These findings demonstrate that melatonin enhances chondrogenic differentiation of human MSC s at least partially through melatonin receptors.
Type of Medium:
Online Resource
ISSN:
0742-3098
,
1600-079X
DOI:
10.1111/jpi.2013.56.issue-1
Language:
English
Publisher:
Wiley
Publication Date:
2014
detail.hit.zdb_id:
2027992-9
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