ANGPTL4 Negatively Regulate the Progression of Osteosarcoma by Remodeling Branched-Chain Amino Acid Metabolism

Abstract BackgroundAngiopoietin-like-4 (ANGPTL4), a secreted glycoprotein that is mainly recognized as a regulator in lipid metabolism, now, is implied in the regulation of the growth and metastasis of various carcinomas. However, less is known about its functions in the progression of sarcomas, let alone osteosarcoma (OS), which is the most common malignant diagnosed in musculoskeletal system.MethodsThe expression of ANGPTL4 in clinical OS samples and cell lines paired with their controls were analyzed in both mRNA and protein levels. Cell functional analysis including proliferation and colony formation were carried out to detect the roles ANGPTL4 takes in the progress of OS using stable ANGPTL4 overexpression and knockdown HOS/MNNG cell lines. The RNA-Seq and bioinformatics analysis were then employed to discover the BCAA metabolism related signaling which is involved in ANGPTL4 functioning on HOS/MNNG cell growth. Furthermore, BCAAs content measurement, and BCATs rescue experiments were performed to confirm the BCAA/mTOR signaling axis that ANGPTL4 triggered in HOS/MNNG cells. Finally, a xenograft mouse model was carried out to further verify the ANGPTL4 /BCAA/mTOR signaling axis discovered. ResultsWe found that the expression of ANGPTL4 is reduced in clinical OS tissues and cell lines compared to cancellous bone tissues and BMSCs, respectively. The knockdown of ANGPTL4 in HOS/MNNG cells results in enhanced cell growth and clone formation. Moreover, BCAA/mTOR signaling axis were discovered to be triggered by ANGPTL4 down regulation in HOS/MNNG cell using RNA-seq. It was also verified that the accumulation of BCAAs activates the mTOR signaling pathway, and in turn promotes HOS/MNNG cell growth using BCAAs content measurement, and BCAT inhibition. Finally, the IHC results of xenograft mouse model also confirmed this ANGPTL4/BCAA/mTOR signaling axis in vivo.ConclusionsTaken together, our results demonstrate that the expression of ANGPTL4 were negatively related to OS progress. Moreover, it was found the down-regulation of ANGPTL4 promoted OS cell growth via BCAAs/mTOR axis.

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Effect of a novel agent, SL-401, targeting interleukin-3 (IL-3)-receptor on plasmacytoid dendritic cell (pDC)-induced myeloma cell growth and drug resistance.

Journal of Clinical Oncology ◽

10.1200/jco.2013.31.15_suppl.8582 ◽

2013 ◽

Vol 31 (15_suppl) ◽

pp. 8582-8582

Author(s):

Dharminder Chauhan ◽

Arghya Ray ◽

Christopher Brooks ◽

Eric K. Rowinsky ◽

Kenneth Carl Anderson

Keyword(s):

Drug Resistance ◽

Cell Growth ◽

Cell Lines ◽

Plasmacytoid Dendritic Cell ◽

Myeloma Cell ◽

Healthy Donors ◽

Signaling Axis ◽

Novel Therapeutic Strategies

8582 Background: Multiple myeloma (MM) remains incurable despite novel therapies, highlighting the need for further identification of factors mediating disease progression and drug resistance. The bone marrow (BM) microenvironment confers growth, survival, and drug resistance in MM cells. Our recent study utilized in vitro and in vivo MM xenograft models to show that plasmacytoid dendritic cells (pDCs) were significantly increased in MM BM and promote MM growth (Chauhan et al., Cancer Cell 2009, 16:309). Importantly, we found increased IL-3 levels upon pDC-MM interaction, which in turn, trigger MM cell growth and pDCs survival. IL-3R is highly expressed on pDCs. We utilized SL-401, a novel biologic conjugate that targets IL-3R, to examine whether abrogation of IL-3–IL-3R signaling axis affects pDC-MM interaction and its tumor promoting sequelae. Methods: MM cell lines, patient MM cells, and pDCs from healthy donors or MM patients were utilized to study the anti-MM activity of SL-401. MM cells and pDCs were cultured alone or together in the presence or absence of SL-401, followed by analysis of cell growth or viability. Results: SL-401 significantly decreased the viability of pDCs at low concentrations (IC50: 0.83 ng/ml; P < 0.005, n = 3). SL-401 also decreased the viability of MM cells at clinically achievable doses. Co-culture of pDCs with MM cells induced growth of MM cell lines; and importantly, low doses (0.8 ng/ml) of SL-401 blocked MM cell growth-promoting activity of pDCs. MM patient-derived pDCs induced growth of MM cell lines and primary MM cells as well; conversely, SL-401 inhibited pDC-triggered MM cell growth (P < 0.005, n= 5). Tumor cells from 3 of the 5 patients were from patients whose disease was progressing while on bortezomib, dexamethasone, and lenalidomide therapies. In agreement with these results, SL-401 blocked pDC-induced growth of dexamethasone-resistant MM cell lines. Conclusions: Our study therefore provides the basis for directly targeting pDCs or blocking the pDC-MM interaction, as well as targeting MM, in novel therapeutic strategies with SL-401 to enhance MM cytotoxicity, overcome drug-resistance, and improve patient outcome.

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Trolox Improves the Sensitivity of Multiple Myeloma to Arsenic Trioxide in Vitro and In Vivo.

Blood ◽

10.1182/blood.v114.22.4920.4920 ◽

2009 ◽

Vol 114 (22) ◽

pp. 4920-4920

Author(s):

Michael Sebag ◽

Xian-Fang Huang ◽

Nicolas Garnier ◽

Wilson H. Miller ◽

Koren Mann

Keyword(s):

Oxidative Stress ◽

Multiple Myeloma ◽

Cell Growth ◽

Mouse Model ◽

Arsenic Trioxide ◽

Cell Lines ◽

Malignant Cells ◽

Myeloma Cells

Abstract Abstract 4920 Arsenic trioxide (ATO) induces apoptosis and promotes differentiation of acute promyelocytic leukemia (APL) cells, but has less activity in other types of cancers. One factor that may impede ATO success outside of APL is its toxicity profile, which limits in vivo concentrations and therefore, therapeutic benefit. We have reported that trolox, an analogue of alpha tocopherol, can augment ATO sensitivity in a variety of malignant cells, while protecting non-malignant cells from ATO toxicity. In this current study, we have focused on Multiple Myeloma (MM), a plasma cell malignancy that often shows resistance to apoptosis, drug inhibition and remains incurable despite tremendous recent advances. Although ATO has activity against MM cells in vitro, clinical trials of ATO, given as a solo agent, in MM have shown limited promise. To see if the addition of trolox could augment ATO toxicity, a panel of human myeloma cell lines (HMCLs, n=9) representing the genetic diversity seen in this disease, were treated with increasing concentration of ATO with and without 100uM trolox. Cell growth was assessed by MTT viability assays and virtually all cell lines were sensitive to varying doses of ATO. Four cell lines (U266, KMS11, MM1R, MM1S) showed profound inhibition of cell growth with very low concentrations of ATO (<1uM). Trolox (100uM) alone had no effect on cell growth, but in concert with ATO further decreased cell growth by up to 50% as compared to the same dose of ATO alone in virtually all cell lines. To further elucidate the mechanism of growth inhibition, annexin V assays were performed by flow cytometry to measure apoptosis. In all cell lines (n=9), a clear increase in the apoptotic fraction was noted when trolox was added to varying doses of arsenic. To test whether oxidative stress plays a role in ATO-mediated apoptosis of myeloma cells, we looked at the induction of a stress response protein (HO-1), a marker of oxidative stress induced by ATO. Western blot analysis revealed that in all myeloma cells tested, HO-1 was dramatically and quickly induced by ATO and further induced by the addition of trolox, indicating a pro-oxidant activity of trolox in the malignant cells. While the mechanism of trolox enhancement of ATO function remains largely unknown, intracellular concentrations of ATO in MM cells, as measured by inductively coupled plasma mass spectrometry, suggest that trolox does not work by augmenting ATO import or intracellular accumulation. To test the efficacy of ATO with trolox in vivo, we used a novel transgenic mouse model of MM that has been shown to faithfully mimic the human disease and its response to treatment (Chesi et al, Cancer Cell 2008 Feb;13(2):167-80). We first treated MM afflicted mice with a low dose of ATO (5.0mg/kg) and Trolox (50mg/kg) to assess for toxicity and tolerability. This dose was well tolerated in all mice when given for 10 days with no obvious toxic effects. Serum protein electrophoresis performed at the end of the 10 day treatment period revealed that even at this low starting dose, one of three mice showed a 30% reduction in its paraprotein peak, while the others remained stable. Further studies with higher ATO concentrations in the same mouse model are underway. In conclusion, these data support the role of ATO plus Trolox, as a promising anti-myeloma therapy. Disclosures No relevant conflicts of interest to declare.

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POU2AF1 As a Master Regulator of Oncogenic Transcription Factor Networks in Myeloma

Blood ◽

10.1182/blood-2020-142580 ◽

2020 ◽

Vol 136 (Supplement 1) ◽

pp. 18-19

Author(s):

Ricardo De Matos Simoes ◽

Ryosuke Shirasaki ◽

Huihui Tang ◽

Shizuka Yamano ◽

Benjamin G Barwick ◽

...

Keyword(s):

Cell Growth ◽

Board Of Directors ◽

Cell Lines ◽

Research Funding ◽

Rna Seq ◽

Advisory Committees ◽

Genome Scale ◽

Crispr Activation

Background: Functional genomics studies based on CRISPR and shRNA have documented that multiple myeloma (MM) cells are preferentially dependent (compared to other neoplasias) on a series of TFs, including IKZF1 and IKZF3 (which are targeted by thalidomide derivatives) and others that are not amenable to degradation or small molecule inhibition. Transcriptional co-factors have been therapeutically targeted, for example, inhibitors of BRD4, a co-factor for pTEFB, can be used to down-regulate c-myc. Aim: To identify new transcriptional vulnerabilities in MM with an emphasis on transcriptional co-factors Methods: We integrated results from genome-scale studies using the AVANA library for loss-of-function by gene editing (in 19 MM lines) and the Calabrese library for CRISPR-mediated gene activation (in 5 MM lines) to identify critical transcriptional co-factors (co-TFs). RNA-Seq analysis was used to identify critical pathways affected by POU2AF1 activation and existing ChIP-Seq tracks in MM cells were reanalyzed. Results: POU2AF1 (OCA-B) was the most preferentially essential TF co-factor in MM cell lines vs. non-MM and one of top genes which, upon CRISPR activation in genome-scale studies, increased MM cell fitness in vitro. We further confirmed the role of this gene using focused libraries of sgRNAs against POU2AF1 in vitro and in an in vivo model of MM cell growth in bone marrow-like scaffolds "functionalized" with humanized mesenchymal bone marrow stromal cells to simulate the human BM. CRISPR activation of POU2AF1 is associated with increased MM cell growth. RNA-Seq of POU2AF1 activation in LP1 cells a transcriptional program characterized by upregulation of other genes that are preferentially essential for MM including PRDM1, SUPT7L, UBE2G2 and TSC1; broad-spectrum oncogenic dependencies (e.g KRAS) and genes known or proposed to be involved in the pathophysiology of MM or other neoplasias (e.g. RUNX2, FGFR3, SMO, CREB5, TNFRSF13B, MEF2D, PCGF2). POU2AF1 overexpression was also associated with down-regulation of CDKN1C; of MHC class II molecules and their transcriptional activator CIITA, suggesting that POU2AF1 activation could also contribute to increased MM growth in vivo by allowing escape from immune surveillance. ATAC-Seq data and genome-wide ChIPseq for H3K27Ac in MM cell lines indicate that chromatin surrounding the POU2AF1 locus was highly accessible, concordant with the consistent expression of this TF in MM cell lines and patient-derived cells. CoMMpass data showed that POU2AF1 expression was enhanced in a subset of MM patients at relapse compared to diagnosis. Motif analysis of ChIP-seq data for POU2AF1 identified significant overlap with motifs for TFs relevant to the POU family (e.g. Oct11, Oct2, Oct4); members of the ETS family (e.g. ELF1, Elf4, GABPA); and other TFs with roles in MM including c-myc; IRF4; NF-kappaB, PRDM1, RUNX2 and the POU2AF1 target CREB5. These data suggest a functional interaction between POU2AF1 and other MM-relevant TFs. The transcriptional signature of POU2AF1 activation is enriched for genes downregulated by suppression/inhibition of MM-preferential TFs or epigenetic regulators including IRF4, PRDM1, IKZF1/3 and DOT1L. POU2AF1 binding motifs are also enriched in the promoter regions of MM-preferential dependencies including several MM-preferential TFs. Conclusions: POU2AF1 is essential for MM cells in vitro and in vivo; has a significantly more pronounced and recurrent role as a dependency in MM compared to most other neoplasias; and can further drive MM cell growth, through its ability to interact with several TFs critical for MM, forming multi-protein functional complexes. These results establish POU2AF1 as a central component in the regulatory network of oncogenic TFs in MM and highlight the value of further exploring POU2AF1 as a therapeutic target in MM. Disclosures Downey-Kopyscinski: Rancho BioSciences, LLC: Current Employment. Tsherniak:Cedilla Therapeutics: Consultancy; Tango Therapeutics: Consultancy. Boise:AstraZeneca: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding; Genetech: Membership on an entity's Board of Directors or advisory committees. Mitsiades:FIMECS: Consultancy, Honoraria; Ionis Pharmaceuticals, Inc.: Consultancy, Honoraria; Arch Oncology: Research Funding; Janssen/Johnson & Johnson: Research Funding; Karyopharm: Research Funding; TEVA: Research Funding; Takeda: Other: employment of a relative; Fate Therapeutics: Consultancy, Honoraria; Sanofi: Research Funding; Abbvie: Research Funding; EMD Serono: Research Funding.

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A Novel Role of BIRC3 in Stemness Reprogramming of Glioblastoma

International Journal of Molecular Sciences ◽

10.3390/ijms23010297 ◽

2021 ◽

Vol 23 (1) ◽

pp. 297

Author(s):

Qiong Wu ◽

Anders E. Berglund ◽

Robert J. MacAulay ◽

Arnold B. Etame

Keyword(s):

Cell Lines ◽

Cellular Heterogeneity ◽

Rna Seq ◽

Self Renewal ◽

Signaling Axis ◽

Bmp4 Expression ◽

Human Gbm ◽

The Impact

Stemness reprogramming remains a largely unaddressed principal cause of lethality in glioblastoma (GBM). It is therefore of utmost importance to identify and target mechanisms that are essential for GBM stemness and self-renewal. Previously, we implicated BIRC3 as an essential mediator of therapeutic resistance and survival adaptation in GBM. In this study, we present novel evidence that BIRC3 has an essential noncanonical role in GBM self-renewal and stemness reprogramming. We demonstrate that BIRC3 drives stemness reprogramming of human GBM cell lines, mouse GBM cell lines and patient-derived GBM stem cells (GSCs) through regulation of BMP4 signaling axis. Specifically, BIRC3 induces stemness reprogramming in GBM through downstream inactivation of BMP4 signaling. RNA-Seq interrogation of the stemness reprogramming hypoxic (pseudopalisading necrosis and perinecrosis) niche in GBM patient tissues further validated the high BIRC3/low BMP4 expression correlation. BIRC3 knockout upregulated BMP4 expression and prevented stemness reprogramming of GBM models. Furthermore, siRNA silencing of BMP4 restored stemness reprogramming of BIRC3 knockout in GBM models. In vivo silencing of BIRC3 suppressed tumor initiation and progression in GBM orthotopic intracranial xenografts. The stemness reprograming of both GSCs and non-GSCs populations highlights the impact of BIRC3 on intra-tumoral cellular heterogeneity GBM. Our study has identified a novel function of BIRC3 that can be targeted to reverse stemness programming of GBM.

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Force estimation from 4D OCT data in a human tumor xenograft mouse model

Current Directions in Biomedical Engineering ◽

10.1515/cdbme-2020-0022 ◽

2020 ◽

Vol 6 (1) ◽

Author(s):

Maximilian Neidhardt ◽

Nils Gessert ◽

Tobias Gosau ◽

Julia Kemmling ◽

Susanne Feldhaus ◽

...

Keyword(s):

Deep Learning ◽

Mouse Model ◽

Haptic Feedback ◽

Human Tumor ◽

Tumor Xenograft ◽

Human Tumor Xenograft ◽

Force Estimation ◽

Xenograft Mouse Model ◽

Dead Tissue

AbstractMinimally invasive robotic surgery offer benefits such as reduced physical trauma, faster recovery and lesser pain for the patient. For these procedures, visual and haptic feedback to the surgeon is crucial when operating surgical tools without line-of-sight with a robot. External force sensors are biased by friction at the tool shaft and thereby cannot estimate forces between tool tip and tissue. As an alternative, vision-based force estimation was proposed. Here, interaction forces are directly learned from deformation observed by an external imaging system. Recently, an approach based on optical coherence tomography and deep learning has shown promising results. However, most experiments are performed on ex-vivo tissue. In this work, we demonstrate that models trained on dead tissue do not perform well in in vivo data. We performed multiple experiments on a human tumor xenograft mouse model, both on in vivo, perfused tissue and dead tissue. We compared two deep learning models in different training scenarios. Training on perfused, in vivo data improved model performance by 24% for in vivo force estimation.

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A novel phosphoramide compound, DCZ0805, shows potent anti-myeloma activity via the NF-κB pathway

Cancer Cell International ◽

10.1186/s12935-021-01973-1 ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Xuejie Gao ◽

Bo Li ◽

Anqi Ye ◽

Houcai Wang ◽

Yongsheng Xie ◽

...

Keyword(s):

Mouse Model ◽

Tumor Burden ◽

High Rate ◽

Cell Counting ◽

Tumor Xenograft ◽

Luciferase Reporter ◽

Therapeutic Effects ◽

Xenograft Mouse Model

Abstract Background Multiple myeloma (MM) is a highly aggressive and incurable clonal plasma cell disease with a high rate of recurrence. Thus, the development of new therapies is urgently needed. DCZ0805, a novel compound synthesized from osalmide and pterostilbene, has few observed side effects. In the current study, we intend to investigate the therapeutic effects of DCZ0805 in MM cells and elucidate the molecular mechanism underlying its anti-myeloma activity. Methods We used the Cell Counting Kit-8 assay, immunofluorescence staining, cell cycle assessment, apoptosis assay, western blot analysis, dual-luciferase reporter assay and a tumor xenograft mouse model to investigate the effect of DCZ0805 treatment both in vivo and in vitro. Results The results showed that DCZ0805 treatment arrested the cell at the G0/G1 phase and suppressed MM cells survival by inducing apoptosis via extrinsic and intrinsic pathways. DCZ0805 suppressed the NF-κB signaling pathway activation, which may have contributed to the inhibition of cell proliferation. DCZ0805 treatment remarkably reduced the tumor burden in the immunocompromised xenograft mouse model, with no obvious toxicity observed. Conclusion The findings of this study indicate that DCZ0805 can serve as a novel therapeutic agent for the treatment of MM.

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Long noncoding RNA LINC00941 promotes pancreatic cancer progression by competitively binding miR-335-5p to regulate ROCK1-mediated LIMK1/Cofilin-1 signaling

Cell Death and Disease ◽

10.1038/s41419-020-03316-w ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Jie Wang ◽

Zhiwei He ◽

Jian Xu ◽

Peng Chen ◽

Jianxin Jiang

Keyword(s):

Pancreatic Cancer ◽

Cell Growth ◽

Cell Lines ◽

Cancer Progression ◽

Noncoding Rna ◽

Epithelial Mesenchymal Transition ◽

Loss Of Function ◽

Mesenchymal Transition

AbstractAn accumulation of evidence indicates that long noncoding RNAs are involved in the tumorigenesis and progression of pancreatic cancer (PC). In this study, we investigated the functions and molecular mechanism of action of LINC00941 in PC. Quantitative PCR was used to examine the expression of LINC00941 and miR-335-5p in PC tissues and cell lines, and to investigate the correlation between LINC00941 expression and clinicopathological features. Plasmid vectors or lentiviruses were used to manipulate the expression of LINC00941, miR-335-5p, and ROCK1 in PC cell lines. Gain or loss-of-function assays and mechanistic assays were employed to verify the roles of LINC00941, miR-335-5p, and ROCK1 in PC cell growth and metastasis, both in vivo and in vitro. LINC00941 and ROCK1 were found to be highly expressed in PC, while miR-335-5p exhibited low expression. High LINC00941 expression was strongly associated with larger tumor size, lymph node metastasis, and poor prognosis. Functional experiments revealed that LINC00941 silencing significantly suppressed PC cell growth, metastasis and epithelial–mesenchymal transition. LINC00941 functioned as a molecular sponge for miR-335-5p, and a competitive endogenous RNA (ceRNA) for ROCK1, promoting ROCK1 upregulation, and LIMK1/Cofilin-1 pathway activation. Our observations lead us to conclude that LINC00941 functions as an oncogene in PC progression, behaving as a ceRNA for miR-335-5p binding. LINC00941 may therefore have potential utility as a diagnostic and treatment target in this disease.

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Acetyl-L-Carnitine downregulates invasion (CXCR4/CXCL12, MMP-9) and angiogenesis (VEGF, CXCL8) pathways in prostate cancer cells: rationale for prevention and interception strategies

Journal of Experimental & Clinical Cancer Research ◽

10.1186/s13046-019-1461-z ◽

2019 ◽

Vol 38 (1) ◽

Cited By ~ 5

Author(s):

Denisa Baci ◽

Antonino Bruno ◽

Caterina Cascini ◽

Matteo Gallazzi ◽

Lorenzo Mortara ◽

...

Keyword(s):

Prostate Cancer ◽

Cell Growth ◽

Cancer Cells ◽

Dietary Supplements ◽

Cell Lines ◽

Angiogenic Factors ◽

Migration And Invasion ◽

Prostate Cancer Cells

Abstract Background Prostate cancer (PCa) is a leading cause of cancer-related death in males worldwide. Exacerbated inflammation and angiogenesis have been largely demonstrated to contribute to PCa progression. Diverse naturally occurring compounds and dietary supplements are endowed with anti-oxidant, anti-inflammatory and anti-angiogenic activities, representing valid compounds to target the aberrant cytokine/chemokine production governing PCa progression and angiogenesis, in a chemopreventive setting. Using mass spectrometry analysis on serum samples of prostate cancer patients, we have previously found higher levels of carnitines in non-cancer individuals, suggesting a protective role. Here we investigated the ability of Acetyl-L-carnitine (ALCAR) to interfere with key functional properties of prostate cancer progression and angiogenesis in vitro and in vivo and identified target molecules modulated by ALCAR. Methods The chemopreventive/angiopreventive activities ALCAR were investigated in vitro on four different prostate cancer (PCa) cell lines (PC-3, DU-145, LNCaP, 22Rv1) and a benign prostatic hyperplasia (BPH) cell line. The effects of ALCAR on the induction of apoptosis and cell cycle arrest were investigated by flow cytometry (FC). Functional analysis of cell adhesion, migration and invasion (Boyden chambers) were performed. ALCAR modulation of surface antigen receptor (chemokines) and intracellular cytokine production was assessed by FC. The release of pro-angiogenic factors was detected by a multiplex immunoassay. The effects of ALCAR on PCa cell growth in vivo was investigated using tumour xenografts. Results We found that ALCAR reduces cell proliferation, induces apoptosis, hinders the production of pro inflammatory cytokines (TNF-α and IFN-γ) and of chemokines CCL2, CXCL12 and receptor CXCR4 involved in the chemotactic axis and impairs the adhesion, migration and invasion capabilities of PCa and BPH cells in vitro. ALCAR exerts angiopreventive activities on PCa by reducing production/release of pro angiogenic factors (VEGF, CXCL8, CCL2, angiogenin) and metalloprotease MMP-9. Exposure of endothelial cells to conditioned media from PCa cells, pre-treated with ALCAR, inhibited the expression of CXCR4, CXCR1, CXCR2 and CCR2 compared to those from untreated cells. Oral administration (drinking water) of ALCAR to mice xenografted with two different PCa cell lines, resulted in reduced tumour cell growth in vivo. Conclusions Our results highlight the capability of ALCAR to down-modulate growth, adhesion, migration and invasion of prostate cancer cells, by reducing the production of several crucial chemokines, cytokines and MMP9. ALCAR is a widely diffused dietary supplements and our findings provide a rational for studying ALCAR as a possible molecule for chemoprevention approaches in subjects at high risk to develop prostate cancer. We propose ALCAR as a new possible “repurposed agent’ for cancer prevention and interception, similar to aspirin, metformin or beta-blockers.

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