Upregulation of MMP is Mediated by MEK1 Activation During Differentiation of Monocyte into Macrophage

  • Lim, Jae-Won (Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University) ;
  • Cho, Yoon-Jung (Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University) ;
  • Lee, Dong-Hyun (Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University) ;
  • Jung, Byung-Chul (Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University) ;
  • Kang, Han-Sol (Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University) ;
  • Kim, Tack-Joong (Division of Biological Science and Technology, College of Science and Technology, Yonsei University) ;
  • Rhee, Ki-Jong (Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University) ;
  • Kim, Tae-Ue (Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University) ;
  • Kim, Yoon-Suk (Department of Biomedical Laboratory Science, College of Health Sciences, Yonsei University)
  • Received : 2012.05.30
  • Accepted : 2012.06.08
  • Published : 2012.06.30


Matrix metalloproteinases (MMPs) are zinc-dependent endopeptidases which degrade extracellular matrix (ECM) during embryogenesis, wound healing, and tissue remodeling. Dysregulation of MMP activity is also associated with various pathological inflammatory conditions. In this study, we examined the expression pattern of MMPs during PMA-induced differentiation of THP-1 monocytic cells into macrophages. We found that MMP1, MMP8, MMP3, MMP10, MMP12, MMP19, MMP9, and MMP7 were upregulated during differentiation whereas MMP2 remained unchanged. Expression of MMPs increased in a time-dependent manner; MMP1, MMP8, MMP3, MMP10, and MMP12 increased beginning at 60 hr post PMA treatment whereas MMP19, MMP9, and MMP7 increased beginning at 24 hr post PMA treatment. To identify signal transduction pathways involved in PMA-induced upregulation of MMPs, we treated PMA-differentiated THP-1 cells with specific inhibitors for PKC, MEK1, NF-${\kappa}B$, PI3K, p38 MAPK and PLC. We found that inhibition of the MEK1 pathway blocked PMA-induced upregulation of all MMPs to varying degrees except for MMP-2. In addition, expression of select MMPs was inhibited by PI3K, p38 MAPK and PLC inhibitors. In conclusion, we show that of the MMPs examined, most MMPs were up-regulated during differentiation of monocyte into macrophage via the MEK1 pathway. These results provide basic information for studying MMPs expression during macrophage differentiation.


Supported by : 한국연구재단


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