Abstract
Lung cancer is a leading cause of cancer-associated deaths worldwide. Lung cancer may lead to circadian disruption, which could contribute to the development of lung cancer. Recently, several studies using animal models indicated that tumors influence systemic circadian homeostasis in remote tissues. However, it is unclear whether carcinoma of the lungs influences remote circadian rhythm, whether this effect exists in humans, and whether signals from the tumor travel through the blood. In this study, we used a cell-based assay to determine whether serum from patients with lung adenocarcinoma could modulate the molecular clock. We found that the daily oscillation period of Bmal1 was significantly lengthened following treatment with serum from untreated lung adenocarcinoma patients. In addition, heat inactivation of this serum abolished the effect, suggesting that a heat-sensitive circulating factor(s) is present in the serum of untreated lung adenocarcinoma patients. Using real-time PCR, we also examined the mRNA abundance of Bmal1, Cry1, and Per1 in human osteosarcoma u2os cell line, HUVECs and A549 cell lines. The expression of Bmal1 was changed in A549 cells in the presence of sera from lung adenocarcinoma patients. Our study revealed a direct effect of serum from lung adenocarcinoma patients on the molecular clock.
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Data supporting the findings of this study are available from the corresponding author, Yanning Cai, on reasonable request.
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Acknowledgements
Research support was provided by the National Key R&D Program of China (grant numbers: 2017YFC0909103, 2017YFC0909100, 2017YFC0840100, 2017YFC0840105, 2016YFC1201703), the National Natural Science Foundation of China (grant number: 81671246), and Beijing Municipal Commission of Health and Family Planning (grant number: PXM2017-026283-000002, PXM2018-026283-000002). We thank Michal Bell, PhD, from Liwen Bianji, Edanz Editing China (www.liwenbianji.cn/ac), and Dr. Jagadish K. Chhetri M.D, PhD for editing the English text of this manuscript.
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Chang, Y., Zhao, C., Ding, H. et al. Serum factor(s) from lung adenocarcinoma patients regulates the molecular clock expression. J Cancer Res Clin Oncol 147, 493–498 (2021). https://doi.org/10.1007/s00432-020-03467-5
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DOI: https://doi.org/10.1007/s00432-020-03467-5