Micro-RNA-21 regulates TGF-β-induced myofibroblast differentiation by targeting PDCD4 in tumor-stroma interaction.
Transforming growth factor-β1 (TGF-β1) induces stromal fibroblast-to-myofibroblast transdifferentiation in the tumor-stroma interactive microenvironment via modulation of multiple phenotypic and functional genes, which plays a critical role in tumor progression. Up to now, the involvement of micro-RNAs (miRNAs) and their roles in TGF-β1-induced myofibroblast differentiation in tumor-stroma interaction are unclear. Using quantitative real-time RT-PCR, we demonstrated that the expression of micro-RNA-21 (miR-21) was upregulated in activated fibroblasts after treatment with TGF-β1 or conditioned medium from cancer cells. To determine the potential roles of miR-21 in TGF-β1-mediated gene regulation during myofibroblast conversion, we showed that miR-21 expression was downregulated by miR-21 inhibitor and upregulated by miR-21 mimic. Interestingly, downregulation of miR-21 with the inhibitor effectively inhibited TGF-β1-induced myofibroblast differentiation while upregulation of miR-21 with a mimic significantly promoted myofibroblast differentiation. We further demonstrated that MiR-21 directly targeted and downregulated programmed cell death 4 (PDCD4) gene, which in turn acted as a negative regulator of several phenotypic and functional genes of myofibroblasts. Taken together, these results suggested that miR-21 participated in TGF-β1-induced myofibroblast transdifferentiation in cancer stroma by targeting PDCD4.
Yao
Qin
Q
Griffith Institute for Health and Medical Research, Griffith University, Gold Coast Campus, Southport, QLD, Australia.
Cao
Siyu
S
Li
Chun
C
Mengesha
Asferd
A
Kong
Beihua
B
Wei
Mingqian
M
D051017:Apoptosis Regulatory Proteins / Q000235:genetics / Q000378:metabolism*; D015153:Blotting, Western; D002454:Cell Differentiation; D002478:Cells, Cultured; D003110:Colonic Neoplasms / Q000378:metabolism / Q000473:pathology; D017077:Culture Media, Conditioned / Q000494:pharmacology; D005260:Female; D005333:Fetus; D005347:Fibroblasts / Q000166:cytology* / Q000378:metabolism; D005455:Fluorescent Antibody Technique; D005786:Gene Expression Regulation; D006801:Humans; D008168:Lung / Q000378:metabolism / Q000473:pathology; D035683:MicroRNAs / Q000502:physiology*; D058628:Myofibroblasts / Q000166:cytology* / Q000378:metabolism; D010051:Ovarian Neoplasms / Q000378:metabolism / Q000473:pathology; D012333:RNA, Messenger / Q000235:genetics; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017154:Stromal Cells / Q000378:metabolism* / Q000473:pathology; D016212:Transforming Growth Factor beta / Q000235:genetics / Q000378:metabolism*; D059016:Tumor Microenvironment
D051017:Apoptosis Regulatory Proteins; D017077:Culture Media, Conditioned; C524940:MIRN21 microRNA, human; D035683:MicroRNAs; C114487:PDCD4 protein, human; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D016212:Transforming Growth Factor beta