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Bezielle (BZL101)‐induced oxidative stress damage followed by redistribution of metabolic fluxes in breast cancer cells: A combined proteomic and metabolomic study
Author(s) -
Klawitter Jelena,
Klawitter Jost,
Gurshtein Jennifer,
Corby Kyler,
Fong Sylvia,
Tagliaferri Mary,
Quattrochi Linda,
Cohen Isaac,
Shtivelman Emma,
Christians Uwe
Publication year - 2011
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.25965
Subject(s) - citric acid cycle , oxidative stress , glycolysis , thioredoxin , intracellular , biochemistry , cancer cell , biology , oxidative phosphorylation , chemistry , metabolism , cancer , genetics
Bezielle is an orally administered aqueous extract of Scutellaria barbata for treatment of advanced and metastatic breast cancer. Phase I trials showed promising tolerability and efficacy. In our study, we used a combined proteomic–metabolomic approach to investigate the molecular pathways affected by Bezielle in ER‐positive BT474 and ER‐negative SKBR3 cell lines. In both, Bezielle inhibited cell proliferation, induced cell death and G2 cycle arrest by regulating the mediator proteins Jab1, p27 Kip1 and p21 Cip1 . In addition, it stimulated reactive oxygen species production, hyperactivation of PARP and inhibition of glycolysis. Bezielle's ability to induce oxidative stress was associated with the changes in expression of redox potential maintaining enzymes: glutathione‐ and thioredoxin‐related proteins and peroxiredoxins. In regards to cell metabolism, decreased expression of α‐enolase was associated with a reduction of de novo 13 C‐lactate formation. Reduced Krebs cycle activity as evidenced by the reduced expression of α‐ketoglutarate dehydrogenase and succinyl‐CoA synthetase led to decreased intracellular succinate concentrations. By inhibiting glucose metabolism, cells reacted by lowering the expression of glucose transporters and resulting in decreased intracellular glucose concentration. Decreased expression of fatty acid synthase and reduced concentration of phosphocholine indicated considerable changes in phospholipid metabolism. Ultimately, by inhibiting the major energy‐producing pathways, Bezielle caused depletion of ATP and NAD(H). Both cell lines were responsive, thus suggesting that Bezielle has the potential to be effective against ER‐negative breast cancers. In conclusion, Bezielle's cytotoxicity toward cancer cells is primarily based on inhibition of metabolic pathways that are preferentially activated in tumor cells thus explaining its specificity for cancer cells.

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