A novel mechanism of matrix metalloproteinase-9 gene expression implies a role for keratinization Academic Article uri icon


MeSH Major

  • Gene Expression Regulation, Enzymologic
  • Keratinocytes
  • Keratins
  • Matrix Metalloproteinase 9
  • Regulatory Sequences, Nucleic Acid


  • To investigate the pathophysiological role of matrix metalloproteinase (MMP)-9 in the skin, we analyzed MMP-9 expression from human keratinocytes in culture. MMP-9 and the terminal differentiation marker involucrin were co-localized in the same keratinocytes with a high concentration of Ca(2+), a potent stimulator of differentiation. We identified the novel KRE-M9 element, further downstream to the previously reported TPA responsive element in the MMP-9 promoter, and both of these two elements were shown to be important for MMP-9 transcription and Ca(2+) induction. The concomitant upregulation of MMP-9 and involucrin transcripts was probably due to the very similar gene regulatory elements, KRE-M9 and KRE-4, in their respective promoters. These results indicate a novel mechanism of transcriptional regulation for MMP-9 in the process of keratinization, implying the probable association of apoptosis and differentiation of keratinocytes in epidermal skin tissue.

publication date

  • August 15, 2001



  • Academic Article



  • eng

PubMed Central ID

  • PMC1083943

Digital Object Identifier (DOI)

  • 10.1093/embo-reports/kve129

PubMed ID

  • 11463743

Additional Document Info

start page

  • 604

end page

  • 8


  • 2


  • 7