After chemotherapy, tumor cells tend to become more aggressive, making it challenging for natural and adaptive immune responses to fight them. This often results in recurrence and metastasis, leading to higher mortality rates. The purpose of this study is to discover the mechanisms that cause chemotherapy resistance, including altered expression of immune checkpoints, in a colorectal cancer cell line. We used conventional methods to culture the SW-1116 colorectal cancer cell line in this study. The MTT assay was used to determine the IC50 and efficacy of Docetaxel and Doxorubicin. After treatment, quantitative reverse transcription-polymerase chain reaction (qRT-PCR) was used to analyze PD-L1, CTLA-4, and VISTA gene expression in the SW-1116 cell line. The upregulation of VISTA expression showed a significant increase (p < 0.0001) in response to both chemotherapy agents. Moreover, the expression of CTLA-4 exhibited a remarkable level of significance (p < 0.0001), and PD-L1 expression also displayed notable significance (p < 0.0001). Chemotherapeutic agents heighten immune checkpoint gene expression, highlighting potential immune response pathway modulation.
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