title: Distinct ADAM metalloproteinases regulate G protein-coupled receptor-induced cell proliferation and survival.
abstract: Cross-talk between G protein-coupled receptor (GPCR) and epidermal growth factor receptor (EGFR) signaling systems is widely established in a variety of normal and transformed cell types. Here, we demonstrate that the EGFR transactivation signal requires metalloproteinase cleavage of epidermal growth factor-like growth factor precursors in fibroblasts, ACHN kidney, and TccSup bladder carcinoma cells. Furthermore, we present evidence that blockade of the metalloproteinase-disintegrin tumor necrosis factor-alpha-converting enzyme (TACE/ADAM17) by a dominant negative ADAM17 mutant prevents angiotensin II-stimulated pro-HB-EGF cleavage, EGFR activation, and cell proliferation in ACHN tumor cells. Moreover, we found that in TccSup cancer cells, the lysophosphatidic acid-induced transactivation signal is mediated by ADAM15, demonstrating that distinct combinations of growth factor precursors and ADAMs (a disintegrin and metalloproteinases) regulate GPCR-EGFR cross-talk pathways in cell lines derived from urogenital cancer. Our data show further that activation of ADAMs results in discrete cellular responses; whereas GPCR agonists promote activation of the Ras/MAPK pathway and cell proliferation via the EGFR in fibroblasts and ACHN cells, EGFR transactivation pathways regulate activation of the survival mediator Akt/protein kinase B and the susceptibility of fibroblasts and TccSup bladder carcinoma cells to proapoptotic signals such as serum deprivation, death receptor stimulation, and the chemotherapeutic drug doxorubicin. Thus, ADAM15 and -17 function as effectors of GPCR-mediated signaling and define critical characteristics of cancer cells.
authors.affiliation: Department of Molecular Biology, Max-Planck Institute of Biochemistry, Martinsried D-82152, Germany.
authors.forename: Beatrix
authors.initials: B
authors.lastname: Schäfer
authors.forename: Beatrice
authors.initials: B
authors.lastname: Marg
authors.forename: Andreas
authors.initials: A
authors.lastname: Gschwind
authors.forename: Axel
authors.initials: A
authors.lastname: Ullrich
mesh_terms: D051722:ADAM Proteins; D000072198:ADAM17 Protein; D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000378:metabolism; D017209:Apoptosis / Q000502:physiology; D002453:Cell Cycle / Q000502:physiology; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D002470:Cell Survival; D004317:Doxorubicin / Q000378:metabolism; D004789:Enzyme Activation; D004815:Epidermal Growth Factor / Q000378:metabolism; D066246:ErbB Receptors / Q000378:metabolism*; D005347:Fibroblasts / Q000166:cytology / Q000502:physiology; D006801:Humans; D007680:Kidney Neoplasms / Q000378:metabolism / Q000473:pathology; D008024:Ligands; D008246:Lysophospholipids / Q000378:metabolism; D008666:Metalloendopeptidases / Q000235:genetics / Q000378:metabolism*; D034741:RNA, Small Interfering / Q000235:genetics / Q000378:metabolism; D051381:Rats; D043562:Receptors, G-Protein-Coupled / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology*; D015533:Transcriptional Activation; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D001749:Urinary Bladder Neoplasms / Q000378:metabolism / Q000473:pathology
chemical_list: D000903:Antibiotics, Antineoplastic; D008024:Ligands; D008246:Lysophospholipids; D034741:RNA, Small Interfering; D043562:Receptors, G-Protein-Coupled; D014409:Tumor Necrosis Factor-alpha; D004815:Epidermal Growth Factor; D004317:Doxorubicin; D066246:ErbB Receptors; D051722:ADAM Proteins; D008666:Metalloendopeptidases; D000072198:ADAM17 Protein; C000606462:ADAM17 protein, human; C000606464:Adam17 protein, rat; C032881:lysophosphatidic acid