MT1-MMP down-regulates the glucose 6-phosphate transporter expression in marrow stromal cells: a molecular link between pro-MMP-2 activation, chemotaxis, and cell survival

J Biol Chem. 2007 Mar 16;282(11):8142-9. doi: 10.1074/jbc.M610894200. Epub 2007 Jan 17.

Abstract

Bone marrow-derived stromal cells (BMSC) are avidly recruited by experimental vascularizing tumors, which implies that they must respond to tumor-derived growth factor cues. In fact, BMSC chemotaxis and cell survival are regulated, in part, by the membrane type-1 matrix metalloproteinase (MT1-MMP), an MMP also involved in pro-MMP-2 activation and in degradation of the extracellular matrix (ECM). Given that impaired chemotaxis was recently observed in bone marrow cells isolated from a glucose 6-phosphate transporter-deficient (G6PT-/-) mouse model, we sought to investigate the potential MT1-MMP/G6PT signaling axis in BMSC. We show that MT1-MMP-mediated activation of pro-MMP-2 by concanavalin A (ConA) correlated with an increase in the sub-G1 cell cycle phase as well as with cell necrosis, indicative of a decrease in BMSC survival. BMSC isolated from Egr-1-/- mouse or MT1-MMP gene silencing in BMSC with small interfering RNA (siMT1-MMP) antagonized both the ConA-mediated activation of pro-MMP-2 and the induction of cell necrosis. Overexpression of recombinant full-length MT1-MMP triggered necrosis and this was signaled through the cytoplasmic domain of MT1-MMP. ConA inhibited both the gene and protein expression of G6PT, while overexpression of recombinant G6PT inhibited MT1-MMP-mediated pro-MMP-2 activation but could not rescue BMSC from ConA-induced cell necrosis. Cell chemotaxis in response to the tumorigenic growth factor sphingosine 1-phosphate was significantly abrogated in siMT1-MMP BMSC and in chlorogenic acid-treated BMSC. Altogether, we provide evidence for an MT1-MMP/G6PT signaling axis that regulates BMSC survival, ECM degradation, and mobilization. This may lead to optimized clinical applications that use BMSC as a platform for the systemic delivery of therapeutic or anti-cancer recombinant proteins in vivo.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antiporters / biosynthesis*
  • Bone Marrow Cells / cytology*
  • Chemotaxis
  • Down-Regulation*
  • Extracellular Matrix / metabolism
  • Gene Expression Regulation*
  • Glucose-6-Phosphate / metabolism
  • Hydroxamic Acids
  • Indoles / pharmacology
  • Lysophospholipids / pharmacology
  • Matrix Metalloproteinase 14 / metabolism
  • Matrix Metalloproteinase 14 / physiology*
  • Mice
  • Mice, Inbred C57BL
  • Monosaccharide Transport Proteins / biosynthesis*
  • Recombinant Proteins / chemistry
  • Sphingosine / analogs & derivatives
  • Sphingosine / pharmacology
  • Stromal Cells / cytology*

Substances

  • Antiporters
  • Hydroxamic Acids
  • Indoles
  • Lysophospholipids
  • Monosaccharide Transport Proteins
  • Recombinant Proteins
  • Slc37a4 protein, mouse
  • sphingosine 1-phosphate
  • Glucose-6-Phosphate
  • Matrix Metalloproteinase 14
  • ilomastat
  • Sphingosine