Article (Scientific journals)
Mapk Pathway Contributes To Density- And Hypoxia-Induced Expression Of The Tumor-Associated Carbonic Anhydrase Ix
Kopacek, J.; Barathova, M.; Dequiedt, Franck et al.
2005In Biochimica et Biophysica Acta-Gene Structure and Expression, 1729 (1), p. 41-49
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Abstract :
[en] Transcription of the CA9 gene coding for a tumor-associated carbonic anhydrase IX (CA IX) isoform is regulated by hypoxia via the hypoxia-inducible factor 1 (HIF-1) and by high cell density via the phosphatidylinositol-3-kinase (PI3K) pathway. We examined the role of the mitogen-activated protein kinase (MAPK) pathway in the control of CA9 gene expression. Inhibition of MAPK signaling by U0126 in HeLa cells led to reduced activity of the PR1-HRE-luc CA9 promoter construct and decreased CA IX protein levels in dense culture as well as in hypoxia. Similar reduction was obtained by expression of a dominant-negative ERK1 mutant and was also observed in U0126-treated HIF-1alpha-deficient Ka13 cells. Simultaneous treatment with the MAPK and PI3K inhibitors U0126 and LY 294002 had stronger effect than individual inhibition of these pathways. Taken together, our results suggest that besides the PI3K pathway, the MAPK cascade is involved in the regulation of CA9 gene expression under both hypoxia and high cell density.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Kopacek, J.
Barathova, M.
Dequiedt, Franck  ;  Université de Liège - ULiège > GIGA-Research et Gembloux Agro-Bio Tech
Sepelakova, J.
Kettmann, Richard ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
Pastorek, J.
Pastorekova, S.
Language :
English
Title :
Mapk Pathway Contributes To Density- And Hypoxia-Induced Expression Of The Tumor-Associated Carbonic Anhydrase Ix
Publication date :
2005
Journal title :
Biochimica et Biophysica Acta-Gene Structure and Expression
ISSN :
0167-4781
Publisher :
Elsevier, Netherlands
Volume :
1729
Issue :
1
Pages :
41-49
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 23 November 2010

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