Mitochondrial Parameters influence Chemosensitivity in Gastric Cancer Cells

Mitochondria play crucial roles in the survival of malignant cells in gastric and other types of cancers, and many cancer treatments act at least in part via mitochondrial effects. Although several measurable mitochondrial parameters have been associated with sensitivity of certain cancer cells to treatments, it remains unclear how these parameters differ among cancer cells according to differentiation level and histological type. It also remains unclear whether and how the effects of chemotherapy on mitochondrial parameters might be associated with sensitivity to treatment. In this study, we compared mitochondrial parameters in a panel of gastric cancer cell lines with different characteristics, including AGS (moderately differentiated), SNU-1 (poorly differentiated), KATO III (signet ring cell carcinoma; SRCC), and NUGC-4 (SRCC). We examined differences in basal mitochondrial parameters between the cell lines and the impacts of chemotherapy on each parameter. Our results showed that each cell line showed a different response pattern to cisplatin and 5-fluorouracil. For example, cisplatin was much more effective than 5-fluorouracil at killing SNU-1 gastric cancer cells, while KATO III cells exhibited minimal responses to both chemotherapies. These patterns of cytotoxicity were closely aligned with mitochondrial membrane potential. The different gastric cancer cell lines also displayed differences in basal mitochondrial parameters, but the basal measurements did not directly correlate with sensitivity to chemotherapy. Nevertheless, sensitivity was associated with an integrated profile of basal levels and effects of chemotherapy on mitochondrial parameters. Thus, our study highlights the association between mitochondrial parameters and chemosensitivity among gastric cancer cells with diverse characteristics. These findings may guide the development of more precise treatment strategies and targeted therapies for distinct types of gastric cancer.