Project description:Breast cancer is the leading type of cancer in women. Breast cancer brain metastasis is considered as an essential issue in breast cancer patients. Membrane proteins play important roles in breast cancer brain metastasis that contributes to the cell adhesion and penetration of blood-brain barrier. To achieve a deeper insight of the mechanism of breast cancer brain metastasis, liquid chromatography tandem mass spectrometry (LC-MS/MS) was performed to analyze the enriched membrane proteomes from six different breast cancer cell lines. Quantitative proteomic data of all cell lines were compared with MDA-MB-231BR which has the specific brain metastasis capacity. 1239 proteins were identified and 990 were quantified with more than 70% of membrane proteins in all cell lines. Each cell line can be separated apart from others in PCA. Ingenuity pathway analysis (IPA) supported the high brain metastatic ability of 231BR and suggested importance of the up-regulation of integrin proteins and down-regulation of EPHA in brain metastasis. 28 proteins were observed unique expression alteration in 231BR. The up-regulation of NPM1, hnRNP Q, hnRNP K and eIF3l and the down-regulation of TUBB4B and TUBB were observed to be associated with the brain metastasis cell line and may contributes to the breast cancer brain metastasis.
Project description:Breast cancer brain metastasis has been recognized as one of the central issues in breast cancer research. Elucidation of the process and pathway that mediate this step is expected to provide important clues for a better understanding of breast cancer metastasis. Increasing evidence suggests that the aberrant glycosylation patterns greatly contribute to the cell invasion and cancer metastasis. Herein, we combined next generation RNA sequencing with liquid chromatograph-tandem mass spectrometry based proteomic and N-glycomic analysis from five breast cancer cell lines and one brain cancer cell line to investigate the possible mechanism of breast cancer brain metastasis. 24763 genes were identified including 14551 differentially expressed genes across six cell lines while proteomic analysis allowed the quantitation of 1096 differentially expressed proteins with approximately 83.8% proteins’ regulation matching their gene expression change. The genes/proteins associated with cell movement were highlighted in the breast cancer brain metastasis. Integrin signaling pathway and the up-regulation of α-integrin (ITGA2, ITGA3) associated with the brain metastatic process was shown through Ingenuity Pathway Analysis (IPA). Overall 91 glycosylation genes were selected from transcriptomic data and all exhibited differential expression. 12 glycogenes showed unique expression in 231BR. The regulation of these genes could result in an activation prediction of sialylation function in 231BR by ingenuity pathway analysis. In agreement with the changes of glycogenes, 60 N-glycans out of 63 identified exhibited differential expression among cell lines. The correlation of glycogenes and glycans revealed the importance of sialylation and sialylated glycans in breast cancer brain metastasis. Highly sialylated glycans, which were up-regulated in brain seeking cell line 231BR, probably contributes to brain metastasis.
Project description:Interleukin (IL-6) is a pleotropic cytokine with both tumor-promoting and -inhibitory effects on breast cancer growth. However, the mechanisms governing the outcome of IL-6 on cancer progression remain to be clarified. Our study unraveled a novel long noncoding RNA (lncRNA)-AU021063 downstream of IL-6 signaling. We found that IL-6 induced the expression of lncRNA-AU021063 predominantly in breast cancer compared to other cancer types. Mechanistically, IL-6 induced AT-rich interactive domain 5a (Arid5a) expression, which promotes the transcription of lncRNA-AU021063. In turn, lncRNA-AU021063 promotes breast cancer metastasis through stabilizing tribbles homolog 3 (Trib3) and activating Mek/Erk signaling pathway. Genetic ablation of either Arid5a, lncRNA-AU021063 or Trib3 abolished breast cancer metastasis in vitro and in vivo. Overall, our study highlights the importance of IL-6-Arid5a-lncRNA-AU021063 axis in regulating breast cancer invasiveness and metastasis, which may provide potential novel therapeutics for breast cancer.
Project description:Interleukin (IL-6) is a pleotropic cytokine with both tumor-promoting and -inhibitory effects on breast cancer growth. However, the mechanisms governing the outcome of IL-6 on cancer progression remain to be clarified. Our study unraveled a novel long noncoding RNA (lncRNA)-AU021063 downstream of IL-6 signaling. We found that IL-6 induced the expression of lncRNA-AU021063 predominantly in breast cancer compared to other cancer types. Mechanistically, IL-6 induced AT-rich interactive domain 5a (Arid5a) expression, which promotes the transcription of lncRNA-AU021063. In turn, lncRNA-AU021063 promotes breast cancer metastasis through stabilizing tribbles homolog 3 (Trib3) and activating Mek/Erk signaling pathway. Genetic ablation of either Arid5a, lncRNA-AU021063 or Trib3 abolished breast cancer metastasis in vitro and in vivo. Overall, our study highlights the importance of IL-6-Arid5a-lncRNA-AU021063 axis in regulating breast cancer invasiveness and metastasis, which may provide potential novel therapeutics for breast cancer.
Project description:Interleukin (IL-6) is a pleotropic cytokine with both tumor-promoting and -inhibitory effects on breast cancer growth. However, the mechanisms governing the outcome of IL-6 on cancer progression remain to be clarified. Our study unraveled a novel long noncoding RNA (lncRNA)-AU021063 downstream of IL-6 signaling. We found that IL-6 induced the expression of lncRNA-AU021063 predominantly in breast cancer compared to other cancer types. Mechanistically, IL-6 induced AT-rich interactive domain 5a (Arid5a) expression, which promotes the transcription of lncRNA-AU021063. In turn, lncRNA-AU021063 promotes breast cancer metastasis through stabilizing tribbles homolog 3 (Trib3) and activating Mek/Erk signaling pathway. Genetic ablation of either Arid5a, lncRNA-AU021063 or Trib3 abolished breast cancer metastasis in vitro and in vivo. Overall, our study highlights the importance of IL-6-Arid5a-lncRNA-AU021063 axis in regulating breast cancer invasiveness and metastasis, which may provide potential novel therapeutics for breast cancer.
