title: Stromelysin-3 is a potent negative regulator of adipogenesis participating to cancer cell-adipocyte interaction/crosstalk at the tumor invasive front.
abstract: The initial invasive processes during cancer development remain largely unknown. Stromelysin-3/matrix metalloproteinase 11 (ST3/MMP11) is associated with tumor invasion and poor prognosis. We present novel evidence that adipocytes present at human breast tumor invasive front are induced by cancer cells to express ST3. Using mouse syngeneic model, light and electron microscopy showed that in ST3-deficient mice but not in wild-type mice, forced cancer cell-adipocyte interaction/crosstalk results in adipocyte membrane alteration, allowing cancer cell fat infiltration and death. Thus, adipocytes are involved in initial cancer cell survival into connective tissue, and this effect is ST3 mediated. This suggested that ST3 might play a role in adipocyte metabolism. Accordingly, ST3-deficient mice exhibited fat excess and increased mRNA levels of peroxisome proliferator-activated receptor gamma (PPARgamma) and adipocyte protein 2 (aP2) adipogenic markers, indicating that, in vivo, ST3 negatively regulates fat homeostasis. Moreover, ST3-deficient mouse embryonic fibroblasts exhibited a dramatic enhanced potential to differentiate into adipocytes associated with increased PPARgamma and aP2 expression, and recombinant ST3 treatment reverted their differentiation. Thus, in vitro, ST3 reduces adipocyte differentiation in an autocrine manner. High fibroblasts/adipocytes ratio is a stroma feature, and peritumoral fibroblast origin remains debated. Our results support the concept that invading cancer cells aberrantly restore the negative ST3 function on adipogenesis into proximal adipocytes/preadipocytes, leading to the accumulation/maintenance of a particular peritumoral fibroblast subpopulation. Accordingly, in human breast tumors, we observed that ST3-expressing peritumoral fibroblasts are distinct from alpha-smooth muscle actin-expressing myofibroblasts. This constitutes the first report of implication of a MMP in cancer cell-adipocyte interaction/crosstalk during early steps of connective tissue invasion.
authors.affiliation: Institut de Génétique et de Biologie Moléculaire et Cellulaire, UMR 7104 Centre National de la Recherche Scientifique/U596 Institut National de la Sante et de la Recherche Medicale, Université Louis Pasteur, Illkirch Cedex, Strasbourg, France.
authors.forename: Kumari L
authors.initials: KL
authors.lastname: Andarawewa
authors.forename: Elena R
authors.initials: ER
authors.lastname: Motrescu
authors.forename: Marie-Pierre
authors.initials: MP
authors.lastname: Chenard
authors.forename: Anne
authors.initials: A
authors.lastname: Gansmuller
authors.forename: Isabelle
authors.initials: I
authors.lastname: Stoll
authors.forename: Catherine
authors.initials: C
authors.lastname: Tomasetto
authors.forename: Marie-Christine
authors.initials: MC
authors.lastname: Rio
mesh_terms: D017667:Adipocytes / Q000166:cytology* / Q000378:metabolism; D050156:Adipogenesis / Q000502:physiology*; D000818:Animals; D001943:Breast Neoplasms / Q000378:metabolism / Q000473:pathology*; D002450:Cell Communication / Q000502:physiology*; D002454:Cell Differentiation / Q000502:physiology; D003110:Colonic Neoplasms / Q000378:metabolism / Q000473:pathology; D004622:Embryo, Mammalian; D005260:Female; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism; D006801:Humans; D008297:Male; D053507:Matrix Metalloproteinase 11; D008666:Metalloendopeptidases / Q000096:biosynthesis / Q000172:deficiency / Q000502:physiology*; D051379:Mice; D008807:Mice, Inbred BALB C; D009361:Neoplasm Invasiveness
chemical_list: D053507:Matrix Metalloproteinase 11; D008666:Metalloendopeptidases