Effects of low-intensity pulsed ultrasound, dexamethasone/TGF-beta1 and/or BMP-2 on the transcriptional expression of genes in human mesenchymal stem cells: chondrogenic vs. osteogenic differentiation.
The effects of low-intensity pulsed ultrasound (LIPUS) on the differentiation of human mesenchymal stem cells (hMSCs) were investigated in this study. hMSCs were subjected to LIPUS with or without dexamethasone/transforming growth factor-beta1 (TD) or bone morphogenetic protein-2 (BMP-2) and the effects of this treatment were assessed. TD-treated hMSCs exhibited characteristic chondrogenic morphology and increased messenger RNA (mRNA) expression of chondrogenic markers and LIPUS enhanced the chondrogenic differentiation of hMSCs treated with TD. The expression of Runx2, an osteogenic transcription factor was not altered in either TD treatment group; however, a significant increase was detected in the LIPUS only group. The osteogenic appearance exhibited 3 days after LIPUS and/or BMP-2 treatment. Increases in the mRNA expression levels of osteogenic markers, Runx2 and ALP were also detected. There was no additive or altered effect with combined LIPUS and BMP-2 treatment. LIPUS alone can increase osteogenic differentiation of hMSCs and LIPUS enhances TD-mediated chondrogenic differentiation of hMSCs. Clinically, LIPUS may differentially influence bone vs. cartilage repair.
Department of Biomedical Engineering, Chung Yuan Christian University, Chung Li, Taiwan, ROC. tlai@mclean.harvard.edu
Chien-Hung
CH
Lai
Shih-Ching
SC
Chen
Li-Hsuan
LH
Chiu
Charng-Bin
CB
Yang
Yu-Hui
YH
Tsai
Chun S
CS
Zuo
Walter Hong-Shong
WH
Chang
Wen-Fu
WF
Lai
D053674:Aggrecans / Q000235:genetics / Q000378:metabolism; D055396:Bone Morphogenetic Protein 2 / Q000494:pharmacology*; D002454:Cell Differentiation; D020219:Chondrogenesis; D003907:Dexamethasone / Q000494:pharmacology*; D005786:Gene Expression Regulation / Q000187:drug effects*; D006801:Humans; D059630:Mesenchymal Stem Cells / Q000166:cytology / Q000000981:diagnostic imaging / Q000187:drug effects; D010012:Osteogenesis; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000378:metabolism; D055758:SOX9 Transcription Factor / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic; D016212:Transforming Growth Factor beta / Q000494:pharmacology*; D014465:Ultrasonics; D014463:Ultrasonography
C508319:ACAN protein, human; D053674:Aggrecans; D055396:Bone Morphogenetic Protein 2; D012333:RNA, Messenger; D055758:SOX9 Transcription Factor; C527932:SOX9 protein, human; D016212:Transforming Growth Factor beta; D003907:Dexamethasone