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Journal of Cellular Biochemistry 2018-Sep

Scutellaria baicalensis targets the hypoxia-inducible factor-1α and enhances cisplatin efficacy in ovarian cancer.

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Imran Hussain
Sana Waheed
Kashif A Ahmad
John E Pirog
Viqar Syed

Kľúčové slová

Abstrakt

Hypoxia-inducible factor-1alpha (HIF-1α) is aberrantly upregulated in tumors and implicated in angiogenesis, metastasis, and drug resistance. Therefore, developing treatments that target HIF-1α may be a viable therapeutic approach. In Traditional Chinese Medicine (TCM), Scutellaria baicalensis (SB) is used for the treatment of cancer but the anti-cancer mechanisms are not known. We examined the effects of SB on HIF-1α expression in ovarian cancer (OC) cell lines grown under normoxic and hypoxic conditions. SB treatment attenuated HIF-1α expression in cancer cell lines. Treatment of cells with cycloheximide (CHX) reduced HIF-1α levels similar to cells treated with SB. Furthermore, SB-induced HIF-1α inhibition was abrogated by the proteasomal inhibitor MG132 and a lysosome inhibitor, chloroquine. Activation of PI3K/AKT and MAPK/ERK seen in OC cells was reduced with SB. Pretreatment of cells with LY294002 (phosphoinositide 3-kinase inhibitor) and PD98059 (mitogen-activated protein kinase inhibitor) reduced HIF-1α expression comparable to SB-treated cells. SB potentiated the anti-growth effects of cisplatin on OC cells by attenuating the expression of HIF-1α, ABCG1, and ABCG2. Taken together, the findings suggest that targeting HIF-1α with SB could be an effective treatment strategy for cancer and SB can improve the sensitivity of cancer cells to cisplatin, which is a major challenge in therapy for ovarian tumors.

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