title: TIMP-1 gene deficiency increases tumour cell sensitivity to chemotherapy-induced apoptosis.
abstract: Tissue inhibitor of metalloproteinases-1 (TIMP-1) is one of four inhibitors of the matrix metalloproteinases, which are capable of degrading most components of the extracellular matrix. However, in recent years, TIMP-1 has been recognised as a multifunctional protein, playing a complex role in cancer. In this regard, several studies have demonstrated an antiapoptotic effect of TIMP-1 in a number of different cell types. Since chemotherapy works by inducing apoptosis in cancer cells, we raised the hypothesis that TIMP-1 promotes resistance against chemotherapeutic drugs. In order to investigate this hypothesis, we have established TIMP-1 gene-deficient and TIMP-1 wild-type fibrosarcoma cells from mouse lung tissue. We have characterised these cells with regard to TIMP-1 genotype, TIMP-1 expression, malignant transformation and sensitivity to chemotherapy-induced apoptosis. We show that TIMP-1 gene deficiency increases the response to chemotherapy considerably, confirming that TIMP-1 protects the cells from apoptosis. This is to our knowledge the first study investigating TIMP-1 and chemotherapy-induced apoptosis employing a powerful model system comprising TIMP-1 gene-deficient cells and their genetically identical wild-type controls. For future studies, this cell system can be used to uncover the mechanisms and signalling pathways involved in the TIMP-1-mediated inhibition of apoptosis as well as to investigate the possibility of using TIMP-1 inhibitors to optimise the effect of conventional chemotherapy.
authors.affiliation: Department of Veterinary Pathobiology, The Royal Veterinary and Agricultural University, Ridebanevej 9, DK-1870 Frederiksberg C, Denmark.
authors.forename: M L
authors.initials: ML
authors.lastname: Davidsen
authors.forename: S Ø
authors.initials: SØ
authors.lastname: Würtz
authors.forename: M U
authors.initials: MU
authors.lastname: Rømer
authors.forename: N M
authors.initials: NM
authors.lastname: Sørensen
authors.forename: S K
authors.initials: SK
authors.lastname: Johansen
authors.forename: I J
authors.initials: IJ
authors.lastname: Christensen
authors.forename: J K
authors.initials: JK
authors.lastname: Larsen
authors.forename: H
authors.initials: H
authors.lastname: Offenberg
authors.forename: N
authors.initials: N
authors.lastname: Brünner
authors.forename: U
authors.initials: U
authors.lastname: Lademann
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects* / Q000235:genetics; D002455:Cell Division / Q000187:drug effects / Q000235:genetics; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects / Q000235:genetics; D002471:Cell Transformation, Neoplastic / Q000235:genetics; D002478:Cells, Cultured; D003561:Cytarabine / Q000494:pharmacology; D053938:DNA Fragmentation / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D005047:Etoposide / Q000494:pharmacology; D005260:Female; D015870:Gene Expression / Q000235:genetics; D005838:Genotype; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D018345:Mice, Knockout; D008822:Mice, Transgenic; D013997:Time Factors; D019715:Tissue Inhibitor of Metalloproteinase-1 / Q000172:deficiency / Q000235:genetics*; D014750:Vincristine / Q000494:pharmacology
chemical_list: D000970:Antineoplastic Agents; D019715:Tissue Inhibitor of Metalloproteinase-1; D003561:Cytarabine; D014750:Vincristine; D005047:Etoposide