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See detailS Phase Dependence and Involvement of Nf-Kappab Activating Kinase to Nf-Kappab Activation by Camptothecin
Habraken, Yvette ULg; Piret, Bernard; Piette, Jacques ULg

in Biochemical Pharmacology (2001), 62(5), 603-16

Camptothecin (CPT) and derivatives are topoisomerase I poisons currently used as anticancer drugs. Their cytotoxicity is maximal for cells in S phase. Using asynchronous and S phase-synchronized HeLa ... [more ▼]

Camptothecin (CPT) and derivatives are topoisomerase I poisons currently used as anticancer drugs. Their cytotoxicity is maximal for cells in S phase. Using asynchronous and S phase-synchronized HeLa cells, we showed that both the nuclear factor-kappaB (NF-kappaB) activation and its transcriptional activity, induced by CPT treatment, are enhanced in S phase cells. After CPT treatment, NF-kappaB activation reached a maximum within 2-3 hr and was still detectable after 24 hr. The nature of the complex evolved with time, forming mostly p50/p65 after 2 hr to almost exclusively p52 after 24 hr. In HeLa cells, the different steps of the induction were readily observable in S phase synchronized cells, whereas they were barely noticeable in a randomly growing cell population. The signal progressed through the activation of the IKK complex, the phosphorylation of IkappaBalpha, and the degradation of phosphorylated-IkappaBalpha and -IkappaBbeta. The stable expression of wild-type HA-tagged-IkappaBalpha or mutated HA-tagged-IkappaBalpha (S32,36A) allowed us to confirm the essential role of Ser32 and Ser36. NF-kappaB-activating kinase (NIK) could play a role upstream of the IKK complex, as the transient expression of a kinase inactive mutant NIK(K429,430A) abolished the activation of NF-kappaB by CPT. A kinase inactive mutant of mitogen-activated protein/ERK kinase kinase 1 (MEKK1), another kinase susceptible of acting upstream of the signalsome, did not. Cytotoxicity studies with clonal populations expressing different amounts of wild-type or mutated IkappaBalpha revealed that the overexpression of wild-type IkappaBa in large amount increases the sensitivity of HeLa cells to CPT more efficiently than a lower level of expression of non-phosphorylable IkappaBalpha. [less ▲]

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See detailActivation of the NF-kappaB transcription factor by Camptothecin in HeLa cells
Habraken, Yvette ULg; Piret, Bernard; Piette, Jacques ULg

Poster (2000, February 22)

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See detailDNA repair mechanisms: implication in cancer
Habraken, Yvette ULg

Post doctoral thesis (1999)

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See detailATP dependeny assembly of a ternary complex consisting of DNA Mismatch and the yeast Msh2-Msh6 and Mlh1-Pms1 protein complexes
Habraken, Yvette ULg; Sung, Patrick; Prakash, Louise et al

in Journal of Biological Chemistry (1998), 273(16), 9837-41

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See detailEnhancement of MSH2-MSH3-mediated mismatch repair recognition by the yeast MLH1-PMS1 complex
Habraken, Yvette ULg; Sung, Patrick; Prakash, Louise et al

in Current Biology (1997), 7(10), 790-3

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See detailEvidence of involvement of yeast proliferating cell nuclear antigen in DNA mismatch repair
Johnson, Robert; Kovvali, G.; Guzder, Sami et al

in Journal of Biological Chemistry (1996), 271(45), 27897-90

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See detailTranscription factor TFIIH and DNA endonuclease Rad2 constitute yeast nucleotide excision repair factor 3: implications for nucleotide excision repair and Cockayne syndrome
Habraken, Yvette ULg; Sung, Patrick; Prakash, Louise et al

in Proceedings of the National Academy of Sciences of the United States of America (1996), 93(20), 10718-22

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See detailBinding of insertion/deletion DNA mismatches by the heterodimer of yeast mismatch repair protein MSH2 and MSH3
Habraken, Yvette ULg; Sung, Patrick; Prakash, Louise et al

in Current Biology (1996), 6(9), 1185-7

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See detailRAD26, the yeast homolog of human Cockayne 's syndrome group B, encodes a DNA dependent ATPase
Guzder, Sami; Habraken, Yvette ULg; Sung, Patrick et al

in Journal of Biological Chemistry (1996), 271(31), 18314-7

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See detailStructure-specific nuclease activity in yeast nucleotide excision repair protein RAD2
Habraken, Yvette ULg; Sung, Patrick; Prakash, Louise et al

in Journal of Biological Chemistry (1995), 270(50), 30194-8

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See detailReconstitution of yeast nucelotide excision repair with purified RAD proteins, replication protein A and transcription factor TFIIH
Guzder, Sami; Habraken, Yvette ULg; Sung, Patrick et al

in Journal of Biological Chemistry (1995), 270(22), 12973-6

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See detailA conserved 5' to 3' exonuclease activity in yeast and human nucleotide excision repair protein RAD2 and XPG
Habraken, Yvette ULg; Sung, Patrick; Prakash, Louise et al

in Journal of Biological Chemistry (1994), 269(50), 31342-5

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See detailHolliday junction cleavage by yeast Rad1 protein
Habraken, Yvette ULg; Sung, Patrick; Prakash, Louise et al

in Nature (1994), 371

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See detailHuman xeroderman group G gene encodes a DNA endonuclease
Habraken, Yvette ULg; Sung, Patrick; Prakash, Louise et al

in Nucleic Acids Research (1994), 22(16), 3312-6

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See detailYeast excision repair RAD2 encodes a single-stranded DNA endonuclease
Habraken, Yvette ULg; Sung, Partick; Prakash, Louise et al

in Nature (1993), 366

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See detailThe formation and enzymatic repair of DNA modifications caused by haloethylnitrosoureas and related compounds
Ludlum, D.; Habraken, Yvette ULg; Carter, C. et al

in Nucleic Acids Symposium Series (1992), 105

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See detailEnhancement of 1,3-bis(2-chloroethyl)-1-nitrosourea resistance by gy gamma-irradiation or drug pretreatment in rat hepatoma cells
Habraken, Yvette ULg; Laval, Françoise

in Cancer Research (1991), 51(4), 499-503

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See detailExcision of imidazole ring-opened N7-hydroxyethylguanine from chloroethylnitrosourea-treated DNA by Escherichia coli formamidopyrimidine-DNA glycolsylase
Laval, J.; Lopes, F.; Madelmont, J. et al

in IARC Scientific Publications (1991), 105

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