title: Etoposide induces apoptosis and upregulation of TACE/ADAM17 and ADAM10 in an in vitro male germ cell line model.
abstract: Etoposide is a widely used anticancer drug in the treatment of different tumors. Etoposide is known to activate a wide range of intracellular signals, which may in turn induce cellular responses other than apoptosis. ADAM10 and TACE/ADAM17 belong to a family of transmembrane extracellular metalloproteinases involved in paracrine/juxtacrine regulation of many signaling pathways. The aim of this work was to evaluate if etoposide induces upregulation of ADAM10 or TACE/ADAM17 in two cell lines (GC-1 and GC-2) derived from male germ cells. Results showed that etoposide induced apoptosis in a dose-response manner in both GC-1 and GC-2 cells. Apoptosis started to increase 6h after etoposide addition in GC-2 cells, whereas the same was observed 18h after addition to the GC-1 cells. Protein and mRNA levels of ADAM10 and TACE/ADAM17 increased 18h after etoposide was removed from the GC-1 cells. In GC-2 cells, the protein levels of both proteins increased 12h after etoposide was removed. ADAM10 mRNA increased after 3h and then steadily decreased up to 12h after removal, whereas TACE/ADAM17 mRNA decreased after etoposide removal. Finally, apoptosis was prevented in GC-1 and GC-2 cells by the addition of pharmacological inhibitors of ADAM10 and TACE/ADAM17 to the culture medium of etoposide-treated cells. Our results show for the first time that etoposide upregulates ADAM10 and TACE/ADAM17 mRNA and protein levels. In addition, we also show that ADAM10 and TACE/ADAM17 have a role in etoposide-induced apoptosis.
authors.affiliation: Departamento de Fisiología, Pontificia Universidad Católica de Chile, Santiago, Chile.
authors.forename: Carlos
authors.initials: C
authors.lastname: Lizama
authors.forename: Andreas
authors.initials: A
authors.lastname: Ludwig
authors.forename: Ricardo D
authors.initials: RD
authors.lastname: Moreno
mesh_terms: D051722:ADAM Proteins / Q000235:genetics / Q000378:metabolism*; D000072197:ADAM10 Protein; D000072198:ADAM17 Protein; D053829:Amyloid Precursor Protein Secretases / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D015153:Blotting, Western; D002453:Cell Cycle / Q000187:drug effects; D005047:Etoposide / Q000494:pharmacology*; D005854:Germ Cells / Q000187:drug effects*; D066298:In Vitro Techniques; D008297:Male; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D012333:RNA, Messenger / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D013737:Testis / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D015854:Up-Regulation
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D008565:Membrane Proteins; D012333:RNA, Messenger; D005047:Etoposide; D053829:Amyloid Precursor Protein Secretases; D051722:ADAM Proteins; D000072197:ADAM10 Protein; C491234:Adam10 protein, mouse; D000072198:ADAM17 Protein; C000606463:Adam17 protein, mouse