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Abstract
Considering emerging yet contradictory data on circadian rhythms disruption and its effects on tumor initiation and progression, we performed in vivo study to evaluate changes (if any) in clock genes expression in tumor compared to intact tissues as well as to see if tumor development affects normal tissues in tumor-bearing animals. The study was performed in 75 female Wistar rats, intraperitoneally transplanted ovarian cancer was used as a tumor model. Tumor-bearing rats had fragmented circadian rhythmicity of their locomotor activity compared to intact animals. No circadian rhythmicity in proliferation of tumor cells was detected. Precise proliferative rhythmicity was found in normal cells (intestinal epithelium) of intact rats, while significant disruption in such rhythmicity was observed in the same cells of tumor-bearing rats. Average clock genes (BMAL1, CLOCK, CRY1, PER2) expression rate was significantly reduced in tumor cells compared to intact tissues. The data from these experiments let us choosing 2 time points to perform chemotherapy in the following study where effects of chronochemotherapy will be evaluated.References
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