PPARγ silencing enhances osteogenic differentiation of human adipose‐derived mesenchymal stem cells

Journal of Cellular and Molecular Medicine

Mon-Juan Lee²  Hui-Ting Chen²  Mei-Ling Ho²  Chung-Hwan Chen²  Shu-Chun Chuang²  Sung-Cheng Huang²  Yin-Chih Fu²  Gwo-Jaw Wang²  Lin Kang¹ 

[1] Department of Obstetrics and Gynaecology, National Cheng Kung University Medical College and Hospital, Tainan, Taiwan;Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan

关键词: Human adipose tissue‐derived mesenchymal stem cells;    peroxisome proliferator‐activated receptor gamma;    small interfering RNA;    osteogenesis;    adipogenesis;   

DOI  :  10.1111/jcmm.12098

来源: Wiley

【 摘 要 】

Abstract

Peroxisome proliferator-activated receptor gamma (PPARγ) is the master regulator of adipogenesis, and has been indicated as a potential therapeutic target to promote osteoblast differentiation. However, recent studies suggest that suppression of PPARγ inhibits adipogenesis, but does not promote osteogenic differentiation in human bone marrow-derived mesenchymal stem cells (hBMSCs). It was reasoned that the osteogenic effect of PPARγ suppression may be masked by the strong osteogenesis-inducing condition commonly used, resulting in a high degree of matrix mineralization in both control and experimental groups. This study investigates the role of PPARγ in the lineage commitment of human adipose-derived mesenchymal stem cells (hADSCs) by interfering with the function of PPARγ mRNA through small interfering RNAs (siRNAs) specific for PPARγ2. By applying an osteogenic induction condition less potent than that used conventionally, we found that PPARγ silencing led to retardation of adipogenesis and stimulated a higher level of matrix mineralization. The mRNA level of PPARγ decreased to 47% of control 2 days after treatment with 50 nmol/l PPARγ2 siRNA, while its protein expression was 60% of mock control. In the meantime, osteogenic marker genes, including bone morphogenic protein 2 (BMP2), runt-related transcription factor 2 (Runx2), alkaline phosphatase (ALP) and osteocalcin (OC), were up-regulated under PPARγ silencing. Our results suggest that transient suppression of PPARγ promotes the onset of osteogenesis, and may be considered a new strategy to stimulate bone formation in bone tissue engineering using hADSCs.

【 授权许可】

CC BY   
© 2013 The Authors. Journal of Cellular and Molecular Medicine Published by Foundation for Cellular and Molecular Medicine/Blackwell Publishing Ltd

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