Green Tea Polyphenol EGCG Attenuates MDSCs-mediated Immunosuppression through Canonical and Non-Canonical Pathways in a 4T1 Murine Breast Cancer Model
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ABSTRACT:
PROVIDER: PRJNA559664 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR9944860_1.fastq.gz | Fastqsanger.gz | |||
| SRR9944860_2.fastq.gz | Fastqsanger.gz | |||
| SRR9944861_1.fastq.gz | Fastqsanger.gz | |||
| SRR9944861_2.fastq.gz | Fastqsanger.gz | |||
| SRR9944862_1.fastq.gz | Fastqsanger.gz |
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Project description:This study is set out to identify EGCG transcriptional targets in 4T1 breast cancer mediated myeloid-derived suppressor cells (MDSCs) in vitro. MDSCs were sorted from the spleens of 4T1-bearing mice and cultured with EGCG for 6h. RNA was extracted from either the Control group or EGCG group and for RNA-sequence.
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Project description:Several studies in the past decades have reported anti-tumor activity of the bioactive compounds extracted from tea leaves, with a focus on the compound epigallocatechin-3-gallate (EGCG). However, further investigations are required to unravel the underlying mechanisms behind the anti-tumor activity of EGCG. In this study, we demonstrate that EGCG significantly inhibits the growth of 4T1 breast cancer cells in vitro and in vivo. EGCG ameliorated immunosuppression by significantly decreasing the accumulation of myeloid-derived suppressor cells (MDSCs) and increasing the proportions of CD4+ and CD8+ T cells in spleen and tumor sites in 4T1 breast tumor-bearing mice. Surprisingly, a low dose of EGCG (0.5-5 μg/mL) effectively reduced the cell viability and increased the apoptosis rate of MDSCs in vitro. EGCG down-regulated the canonical pathways in MDSCs, mainly through the Arg-1/iNOS/Nox2/NF-κB/STAT3 signaling pathway. Moreover, transcriptomic analysis suggested that EGCG also affected the non-canonical pathways in MDSCs, such as ECM-receptor interaction and focal adhesion. qRT-PCR further validated that EGCG restored nine key genes in MDSCs, including Cxcl3, Vcan, Col4a1, Col8a1, Oasl2, Mmp12, Met, Itsnl and Acot1. Our results provide new insight into the mechanism of EGCG-associated key pathways/genes in MDSCs in the murine breast tumor model.
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Project description:Epigallocatechin-3-gallate (EGCG), a major active polyphenol of green tea, has been shown to downregulate inflammatory responses in macrophages; however, the underlying mechanism has not been understood. Recently, we identified the 67-kDa laminin receptor (67LR) as a cell-surface EGCG receptor that mediates the anti-cancer action of EGCG at physiologically relevant concentrations (0.1-1 mM). Here we show the molecular basis for the downregulation of TLR4 signal transduction by EGCG at 1 mM in macrophages. Anti-67LR antibody treatment or RNAi-mediated silencing of 67LR resulted in abrogation of the inhibitory action of EGCG on LPS-induced activation of downstream signaling pathways and target gene expressions. Additionally, we found that EGCG reduced the TLR4 expression through 67LR. Interestingly, EGCG induced a rapid upregulation of Tollip protein, a negative regulator of TLR-signaling, and this EGCG action was prevented by 67LR silencing or anti-67LR antibody treatment. RNAi-mediated silencing of Tollip impaired the TLR4 signaling inhibitory activity of EGCG. Taken together, these findings demonstrate that 67LR plays a critical role in mediating anti-inflammatory action of a physiologically relevant EGCG and Tollip expression could be modulated through 67LR. These results provide a new insight into the understanding of negative regulatory mechanisms for TLR4 signaling pathway and consequent inflammatory responses which are implicated in the development and progression of many chronic diseases. We quantified expression profile of 210 inflammatory-relating genes in the 67LR-downregulated cells treated with LPS or/and EGCG by microarray
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Project description:Epigallocatechin gallate (EGCG), the major green tea polyphenol, has been a subject of global interest as a potential chemopreventive or chemotherapeutic supplement for breast cancer. While on one hand epidemiological studies suggest inverse correlation between green tea consumption and breast cancer risk, investigations using cell culture and animal models of breast carcinogenesis on the other hand have demonstrated antiproliferative, antitumor, anti-invasive and anti-metastatic properties of EGCG. Mechanism of how EGCG affects cell proliferation, apoptosis, migration and cell cycle by affecting the function of a wide range of molecular targets have also been studied. However, the question as to how EGCG impacts on estrogen responsive genes has not been addressed. This issue is of relevance to our notion of EGCG as a potential chemopreventive or chemotherapeutic agent against breast cancer, which is estrogen dependent in majority of the newly diagnosed cases. Here, using the estrogen receptor α (ERα) positive MCF-7 breast cancer cells as a model, we have examined the effect of EGCG on the estrogen regulated genes. MCF7 cells were treated with vehicle (Ethanol) or EGCG in the presence or absence of estrogen for 24hrs. Total RNA was extracted; Cy3 labeled cRNA was hybridized to Genotypic Technology designed Custom Human Whole Genome 8x60k Microarray (Agilent-027114). Median signal intensities were used for the analysis. After background subtraction (normexp) and normalization (quantile) differentially expressed genes were identified using linear models.
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Project description:Epigallocatechin-3-gallate (EGCG), a major active polyphenol of green tea, has been shown to downregulate inflammatory responses in macrophages; however, the underlying mechanism has not been understood. Recently, we identified the 67-kDa laminin receptor (67LR) as a cell-surface EGCG receptor that mediates the anti-cancer action of EGCG at physiologically relevant concentrations (0.1-1 mM). Here we show the molecular basis for the downregulation of TLR4 signal transduction by EGCG at 1 mM in macrophages. Anti-67LR antibody treatment or RNAi-mediated silencing of 67LR resulted in abrogation of the inhibitory action of EGCG on LPS-induced activation of downstream signaling pathways and target gene expressions. Additionally, we found that EGCG reduced the TLR4 expression through 67LR. Interestingly, EGCG induced a rapid upregulation of Tollip protein, a negative regulator of TLR-signaling, and this EGCG action was prevented by 67LR silencing or anti-67LR antibody treatment. RNAi-mediated silencing of Tollip impaired the TLR4 signaling inhibitory activity of EGCG. Taken together, these findings demonstrate that 67LR plays a critical role in mediating anti-inflammatory action of a physiologically relevant EGCG and Tollip expression could be modulated through 67LR. These results provide a new insight into the understanding of negative regulatory mechanisms for TLR4 signaling pathway and consequent inflammatory responses which are implicated in the development and progression of many chronic diseases.
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Project description:Epigallocatechin gallate (EGCG), the major green tea polyphenol, has been a subject of global interest as a potential chemopreventive or chemotherapeutic supplement for breast cancer. While on one hand epidemiological studies suggest inverse correlation between green tea consumption and breast cancer risk, investigations using cell culture and animal models of breast carcinogenesis on the other hand have demonstrated antiproliferative, antitumor, anti-invasive and anti-metastatic properties of EGCG. Mechanism of how EGCG affects cell proliferation, apoptosis, migration and cell cycle by affecting the function of a wide range of molecular targets have also been studied. However, the question as to how EGCG impacts on estrogen responsive genes has not been addressed. This issue is of relevance to our notion of EGCG as a potential chemopreventive or chemotherapeutic agent against breast cancer, which is estrogen dependent in majority of the newly diagnosed cases. Here, using the estrogen receptor α (ERα) positive MCF-7 breast cancer cells as a model, we have examined the effect of EGCG on the estrogen regulated genes.
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Project description:Overexpression of the epidermal growth factor receptor family member Her-2/neu in breast cancer leads to autophosphorylation of the receptor, and induction of multiple downstream signaling pathways including Akt kinase to NF-kappaB cascade that is associated with poor prognosis. Previously, we demonstrated green tea polyhenol epigallocatechin 3-gallate (EGCG) inhibits growth of NF639 Her-2/neu-driven breast cancer cells via reducing receptor autophosphorylation, and downstream Akt and NF-kappaB activities (Pianetti et al., 2002). Interestingly, we noted that upon prolonged culture in the presence of EGCG some cells developed resistance to the polyphenol. Here we report that resistant cells have lost tyrosine phosphorylation on the Her-2/neu receptor. Surprisingly, they displayed elevated NF-kappaB activity, and inhibition of this activity sensitized cells to EGCG. Data from microarray analysis of the original and resistant NF639 populations of cells were subjected to Gene Set Enrichment Analysis (GSEA) pathway analysis, which revealed that the mitogen activated protein kinase (MAPK) pathway was activated in the resistant cells. Treatment of the resistant cells with a combination of EGCG and the MAPK inhibitor U0216 dramatically reduced colony growth and mesenchymal phenotype. Thus, activation of the MAPK pathway mediates resistance to EGCG. Our studies suggest that gene expression profiling of drug resistant cells may provide a mechanism of determining effective systemic therapies for treatment of these advanced cancers. Keywords: Drug resistance
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Project description:Overexpression of the epidermal growth factor receptor family member Her-2/neu in breast cancer leads to autophosphorylation of the receptor, and induction of multiple downstream signaling pathways including Akt kinase to NF-ï«B cascade that is associated with poor prognosis. Previously, we demonstrated green tea polyhenol epigallocatechin 3-gallate (EGCG) inhibits growth of NF639 Her-2/neu-driven breast cancer cells via reducing receptor autophosphorylation, and downstream Akt and NF-ï«B activities (Pianetti et al., 2002). Interestingly, we noted that upon prolonged culture in the presence of EGCG some cells developed resistance to the polyphenol. Here we report that resistant cells have lost tyrosine phosphorylation on the Her-2/neu receptor. Surprisingly, they displayed elevated NF-ï«B activity, and inhibition of this activity sensitized cells to EGCG. Data from microarray analysis of the original and resistant NF639 populations of cells were subjected to Gene Set Enrichment Analysis (GSEA) pathway analysis, which revealed that the mitogen activated protein kinase (MAPK) pathway was activated in the resistant cells. Treatment of the resistant cells with a combination of EGCG and the MAPK inhibitor U0216 dramatically reduced colony growth and mesenchymal phenotype. Thus, activation of the MAPK pathway mediates resistance to EGCG. Our studies suggest that gene expression profiling of drug resistant cells may provide a mechanism of determining effective systemic therapies for treatment of these advanced cancers. Experiment Overall Design: Total RNA from original NF639 cells and EGCG resistant NF639 cells were harvested using the UltraspecII RNA isolation kit (Biotecx), following the manufacturerâs instruction. The RNA samples were submitted to Boston University Microarray Resource for microarray hybridization using Affymetrix Mouse 430A 2.0 chips. RNAs from two independent experiments were analyzed and data pooled for computational analysis.
2008-06-13 | E-GEOD-4140 | biostudies-arrayexpress
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