Drug resistance is the leading cause of breast cancer-related mortality in women, and triple negative breast cancer (TNBC) is the most aggressive subtype, affecting African American women more aggressively compared to Caucasians women. Of all cancer-related deaths, 15 to 20% are associated with inflammation, where proinflammatory cytokines have been implicated in the tumorigenesis process. The current study investigated the effects of the polyphenolic compound butein (2′,3,4,4′-tetrahydroxychalcone) on cell proliferation and survival, as well as its modulatory effect on the release of proinflammatory cytokines in MDA-MB-231 (Caucasian) and MDA-MB-468 (African American) TNBC cell. The results obtained showed that butein decreased cell viability in a time and dose-dependent manner, and after 72-h of treatment, the cell proliferation rate was reduced in both cell lines. In addition, butein was found to have higher potency in MDA-MB-468, exhibiting anti-proliferative effects in lower concentrations. Apoptosis assays demonstrated that butein (50 μM) increased apoptotic cells in MDA MB-468, showing 60% of the analyzed cells in the apoptotic phase, compared to 20% in MDA-MB-231 cells. Additionally, butein downregulated both protein and mRNA expression of the proinflammatory cytokine, CCL2, and IKBKE in TNFα-activated Caucasian cells, but not in African Americans. This study demonstrates butein potential in cancer cell suppression showing a higher cytotoxic, anti-proliferative, and apoptotic effects in African Americans, compared to Caucasians TNBC cells. It also reveals the butein inhibitory effect on CCL2 expression with a possible association with IKBKE downregulation in MDA-MB-231 cells only, indicating that Caucasians and African Americans TNBC cells respond differently to butein treatment. The obtained findings may provide an explanation regarding the poor therapeutic response in African American patients with advanced TNBC.
26 27 28 29 30 31 32 2 33 Abstract 34 Breast cancer drug resistance is the leading cause of cancer-related mortality in women, and 35 triple negative breast cancer (TNBC) is the most aggressive subtype, affecting African American 36 women more aggressively compared to Caucasians. Of all cancer-related deaths, 15 to 20% are 37 associated with inflammation, where proinflammatory cytokines have been implicated in the 38 tumorigenesis process. The current study investigated the effects of the polyphenolic compound 39 butein (2′,3,4,4′-tetrahydroxychalcone) in cell proliferation and survival, as well as its modulatory 40 effect on the release of proinflammatory cytokines in MDA-MB-231 (Caucasian) and MDA-MB-41 468 (African American) TNBC cell. Results showed that butein decreased cell viability in a time 42 and dose-dependent manner and after 72-h of treatment, cell proliferation rate was reduced in 43 both cell lines. In addition, butein presented higher potency in MDA-MB-468, exhibiting anti-44 proliferative effects in lower concentrations. Apoptosis assays demonstrated that butein increased 45 apoptotic cells in MDA MB-468, showing 90% of the analyzed cells in the apoptotic phase, 46 compared to 54% in MDA-MB-231 cells. Additionally, butein downregulated both, protein and 47 mRNA expression of CCL2 proinflammatory cytokine and IKBKE in Caucasian cells, but not in 48 African Americans. This study demonstrates butein potential in cancer suppression showing a 49 higher cytotoxic, anti-proliferative, and apoptotic effects in African Americans, compared to 50 Caucasians TNBC cells. It also reveals the butein inhibitory effect on CCL2 expression with a 51 possible association with IKBKE downregulation in MDA-MB-231 cells only, indicating that
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