An enhanced chemopreventive effect of methyl donor S-adenosylmethionine in combination with 25-hydroxyvitamin D in blocking mammary tumor growth and metastasis  

作　　者：Niaz Mahmood Ani Arakelian William J.Muller Moshe Szyf Shafaat A.Rabbani 

机构地区：[1]Department of Medicine,McGill University Health Centre,Montreal,QC H4A3J1,Canada [2]Department of Biochemistry,McGill University,Montreal,QC H3A 1A3,Canada [3]Department of Pharmacology and Therapeutics,McGill University,Montreal,QC H3G 1V6,Canada

出　　处：《Bone Research》2020年第3期300-311,共12页骨研究（英文版）

摘　　要：Therapeutic targeting of metastatic breast cancer still remains a challenge as the tumor cells are highly heterogenous and exploit multiple pathways for their growth and metastatic spread that cannot always be targeted by a single-agent monotherapy regimen.Therefore,a rational approach through simultaneous targeting of several pathways may provide a better anti-cancer therapeutic effect We tested this hypothesis using a combination of two nutraceutical agents S-adenosylmethionine(SAM)and Vitamin D(Vit.D)prohormone[25-hydroxyvitamin D;/25(OH)D,]that are individually known to exert distinct changes in the expression of genes involved in tumor growth and metastasis.Our results show that both SAM and 25(OH)D monotherapy significantly reduced proliferation and clonogenic survival of a panel of breast cancer cell lines in vitro and inhibited tumor growth,lung metastasis,and breast tumor cell colonization to the skeleton in vivo.However,these effects were significantly more pronounced in the combination setting.RNA-Sequencing revealed that the transcriptomic footprint on key cancer-related signaling pathways is broader in the combination setting than any of the monotherapies.Furthermore,comparison of the differentially expressed genes from our transcriptome analyses with publicly available cancer-related dataset demonstrated that the combination treatment upregulates genes from immune-related pathways that are otherwise downregulated in bone metastasis in vivo.Since SAM and Vit.D are both approved nutraceuticals with known safety profiles,this combination treatment may serve as a novel strategy to reduce breast cancer-associated morbidity and mortality。

关 键 词：METASTASIS VITAMIN inhibited 

分 类 号：R737.9[医药卫生—肿瘤]