Liu N, Li X, Fu Y, Li Y, Lu W, Pan Y, Yang J, Kong J. Inhibition of lung cancer by vitamin D depends on downregulation of histidine-rich calcium-binding protein.
J Adv Res 2020;
29:13-22. [PMID:
33842001 PMCID:
PMC8020154 DOI:
10.1016/j.jare.2020.08.013]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 07/21/2020] [Accepted: 08/17/2020] [Indexed: 12/25/2022] Open
Abstract
Introduction
Intrinsic vitamin D affects the proliferation, apoptosis, invasion, metastasis, and tumorigenesis of lung cancer by regulating tumor signaling pathways. Histidine-rich calcium-binding protein (HRC) maintains Ca2+ homeostasis, which plays crucial roles in the occurrence and development of cancer.
Objectives
Our study aims to investigate the ability of vitamin D in the regulation of HRC and the role of HRC playing in lung cancer.
Methods
We investigated the effects of vitamin D on lung cancer and the underlying mechanisms, by measuring HRC and vitamin D receptor (VDR) expression in lung cancer, paracancer, and normal tissues from patients using immunohistochemistry, western blotting, and real time RT-PCR. We transfected H460 lung cancer cells (supplemented or not with vitamin D) with PX458-HRC and pcDNA3.1-HRC plasmids and injected mice with lung cancer cells harboring pcDNA3.1-vector or pcDNA3.1-HRC plasmids.
Results
Vitamin D inhibited HRC expression and H460 cell migration and proliferation, and promoted apoptosis compared with controls. The expression of HRC and VDR was significantly upregulated and downregulated, respectively, in lung cancer versus paracancer or normal tissues. Cell proliferation and migration were reduced, apoptotic cells were more and tumors were smaller in mice treated with vitamin D/cholecalciferol cholesterol emulsion (CCE) than in vitamin D/CCE+HRC+/+ mice.
Conclusion
Vitamin D inhibited lung cancer tumor growth, migration, and proliferation by downregulating HRC.
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