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Abstract
Circadian clock is a complex mechanism regulating many different physiological processes. Preclinical, epidemiological and clinical studies demonstrate association between circadian rhythms disruption and tumor initiation. Study of modulation of solid tumor cells biological properties through enhancement of clock mechanisms could attribute to the development of more effective chemo- and hormone therapy approaches.
Aim: Evaluate the effects of ovarian and lung tumor cells synchronization with dexamethasone in vitro on cells sensitivity to cisplatin.
Materials and methods: Metastatic ovarian cancer (n=3) and lung cancer (n=3) cell lines were obtained from patients tumors. Tumor cell cultivation was performed in accordance with the protocol. Artificial synchronization was performed with dexamethasone 200 nM introduction to the cell cultures. Doses of cisplatin used were 1.5 and 3.0 mg/ml. xCELLigence Real-Time Cell Analysis and Cell-IQ was used to measure proliferation and chemoresistance of tumor cells.
Results: Each cell-line had individual morphological characteristics and proliferation parameters. Preliminary incubation with dexamethasone (2 h) had a stimulating effect on proliferation of all tumor cell lines (Slope min -4.3(0.3)хЕ ‘х10-3 - max 36.8(0.6)хЫх10'3, min 2.2(0.2)хЕ1х10'3- max 50.4(0.8)хЕ1х10'3), and increased their sensitivity to cisplatin (min -43(2.6)хЕ1х10-3 - max 57.5(0.6)хЕ1х10-3 и min -217,3(2,2) -1,9(0,1)хч-1х10-3 - max -1,9(0,1)хч'1х10'3, respectively.
Conclusion: These results should be the platform for future studies of the interaction of clock mechanisms, cell cycle regulation and viability of tumor cells.
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