Voprosy meditsinskoi khimii (ISSN 0042-8809)

Types I and IV collagenases and their endogenous regulators in immortalized transformed fibroblasts

   


1. Orekhovich Institute of Biomedical Chemistry, RAMS
2. Institute of Carcinogenesis, Cancer Research Center, RAMS, Moscow, Russia
PubMed Id: 11386000
Year: 2001 vol: 47  issue:1  pages: 72-79
Abstract: To elucidate the role of matrix metalloproteinases (MMP) in carcinogenesis, the expression of collagenases of types I (MMP-I) and IV (MMP-2 and MMP-9) as well as the behaviour of urokinase-like plasminogen activator (uPA) and of tissue MMP inhibitors (TIMP) in immortalized (IF) and transformed (TF) fibroblasts were investigated. The study was carried out using embryo rat fibroblasts, sequentially immortalized with the LT gene of human papilloma virus and transformed with the E7 gene of human papilloma virus (HPV-16). As control was used the primary fibroblast (PF) culture of Fisher rats. In IF, the collagease activity was at the same level as it was in PF. The activity of uPA in IF was increased by 2-2.5-fold; the titrated amount of free endogenous inhibitiors in IF and PF was at essentially the same level while being markedly higher than in TF. At the stage of fibroblast transformation with the E7 gene of HPV-16, there was seen an increase of Type IV collagenases and a decrease of Type I collagenase, both these indices being most pronounced in the cells with most developed tumorogenic properties. In TF there occurred a decrease of free endogenous MMP inhibitors relative to the enzyme activity and, at the same time, a decrease in uAF activity, indicating the changes occurring in the enzyme/inhibitor/activator ratio and hence the enhancement of the destructive potential of the cells (in this case, at the cost of Type IV collagenase activity)
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Reference: Solovyeva N.I., Vinokurova S.V., Dilakyan E.A., Gureeva T.A., Zhurbitskaya V.A., Balayevskaya T.O., Types I and IV collagenases and their endogenous regulators in immortalized transformed fibroblasts, Voprosy meditsinskoi khimii, 2001, vol: 47(1), 72-79.
References
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