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• W2079558003 abstract "Resistance of tumor cells to chemotherapy, such as 5‑fluorouracil (5‑FU), is an obstacle for successful treatment of cancer. As a follow‑up of a previous study we have investigated the effect of conditioned media (CM) from macrophages of M1 or M2 phenotypes on 5‑FU cytotoxicity on the colon cancer cell lines HT‑29 and CACO‑2. HT‑29 cells, but not CACO‑2 cells, having been treated with a combination of M1 CM and 5‑FU recovered their cell growth to a much larger extent compared to cells having been treated with 5‑FU alone when further cultured for 7 days in fresh media. M1 CM treatment of HT‑29, but not CACO‑2 cells, induced cell cycle arrest in the G0/G1 and G2/M phases. 5‑FU treatment induced accumulation of cells in S‑phase in both HT‑29 and CACO‑2 cells. This accumulation of cells in S‑phase was attenuated by combined M1 CM and 5‑FU treatment in HT‑29 cells, but not in CACO‑2 cells. The mRNA expression of cell cycle regulatory proteins and 5‑FU metabolic enzymes were analyzed in an attempt to find possible mechanisms for the M1 CM induced attenuation of 5‑FU cytotoxicity in HT‑29. Thymidylate synthetase (TS) and thymidine phosphorylase (TP) were found to be substantially downregulated and upregulated, respectively, in HT‑29 cells treated with M1 CM, making them unlikely as mediators of reduced 5‑FU cytotoxicity. Among cell cycle regulating proteins, p21 was induced in HT‑29 cells, but not in CACO‑2 cells, in response to M1 CM treatment. However, small interfering RNA (siRNA) knockdown of p21 had no effect on the M1 CM induced cell cycle arrest seen in HT‑29 and neither did it change the growth recovery after combined treatment of HT‑29 cells with M1 CM and 5‑FU. In conclusion, treatment of HT‑29 cells with M1 CM reduces the cytotoxic effect of 5‑FU and this is mediated by a M1 CM induced cell cycle arrest in the G0/G1 and G2/M phases. So far, we lack an explanation why this action is absent in the CACO‑2 cells. The current findings may be important for optimization of chemotherapy in colon cancer." @default.
• W2079558003 created "2016-06-24" @default.
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• W2079558003 date "2014-10-07" @default.
• W2079558003 modified "2023-09-26" @default.
• W2079558003 title "Conditioned media from human macrophages of M1 phenotype attenuate the cytotoxic effect of 5-fluorouracil on the HT-29 colon cancer cell line" @default.
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• W2079558003 doi "https://doi.org/10.3892/ijo.2014.2696" @default.
• W2079558003 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4238731" @default.
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