Article (Scientific journals)
Ascorbate potentiates the cytotoxicity of menadione leading to an oxidative stress that kills cancer cells by a non-apoptotic caspase-3 independent form of cell death
Verrax, Julien; Cadrobbi, Julie; Marques, Carole et al.
2004In Apoptosis, 9 (2), p. 223-233
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Keywords :
ascorbate; menadione; oxidative stress; autoschizis; hepatocarcinoma cells
Abstract :
[en] Hepatocarcinoma cells (TLT) were incubated in the presence of ascorbate and menadione, either alone or in combination. Cell death was only observed when such compounds were added simultaneously, most probably due to hydrogen peroxide (H2O2) generated by ascorbate-driven menadione redox cycling. TLT cells were particularly sensitive to such an oxidative stress due to its poor antioxidant status. DNA strand breaks were induced by this association but this process did not correspond to oligosomal DNA fragmentation (a hallmark of cell death by apoptosis). Neither caspase-3-like DEVDase activity, nor processing of procaspase-3 and cleavage of poly(ADP-ribose) polymerase (PARP) were observed in the presence of ascorbate and menadione. Cell death induced by such an association was actively dependent on protein phosphorylation since it was totally prevented by preincubating cells with sodium orthovanadate, a tyrosine phosphatase inhibitor. Finally, while H2O2, when administered as a bolus, strongly enhances a constitutive basal NF-kappaB activity in TLT cells, their incubation in the presence of ascorbate and menadione results in a total abolition of such a constitutive activity.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Verrax, Julien;  Université Catholique de Louvain - UCL > Département des Sciences Pharmaceutiques > Unité de pharmacocinétique, métabolisme, nutrition et toxicologie
Cadrobbi, Julie;  Université Catholique de Louvain - UCL > Département des Sciences Pharmaceutiques > unité de Pharmacocinétique, métabolisme, nutrition et toxicologie
Marques, Carole;  Université Catholique de Louvain - UCL > Département de Pharmacologie > Unité de Pharmacocinétique, métabolosime, nutrition et toxicologie
Taper, Henryk;  Université Catholique de Louvain - UCL > Département de Pharmacologie > Unité de Pharmacocinétique, métabolisme, nutrition et toxicologie
Habraken, Yvette ;  Université de Liège - ULiège > Virologie - Immunologie
Piette, Jacques ;  Université de Liège - ULiège > Département des sciences de la vie > Virologie - Immunologie
Calderon, Pedro Buck;  Université Catholique de Louvain - UCL > Département des Sciences Pharmaceutiques > Unité de pharmacocinétique, métabolisme nutrition et toxicologie
Language :
English
Title :
Ascorbate potentiates the cytotoxicity of menadione leading to an oxidative stress that kills cancer cells by a non-apoptotic caspase-3 independent form of cell death
Publication date :
March 2004
Journal title :
Apoptosis
ISSN :
1360-8185
eISSN :
1573-675X
Publisher :
Kluwer Academic Publ, Dordrecht, Netherlands
Volume :
9
Issue :
2
Pages :
223-233
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 14 December 2009

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