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Conforti JM, Ziegler AM, Worth CS, Nambiar AM, Bailey JT, Taube JH, Gallagher ES. Differences in Protein Capture by SP3 and SP4 Demonstrate Mechanistic Insights of Proteomics Clean-up Techniques. bioRxiv 2024:2024.03.13.584881. [PMID: 38559195 PMCID: PMC10980087 DOI: 10.1101/2024.03.13.584881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
The goal of proteomics experiments is to identify proteins to observe changes in cellular processes and diseases. One challenge in proteomics is the removal of contaminants following protein extraction, which can limit protein identification. Single-pot, solid-phase-enhanced sample preparation (SP3) is a clean-up technique in which proteins are captured on carboxylate-modified particles through a proposed hydrophilic-interaction-liquid-chromatography (HILIC)-like mechanism. However, recent results have suggested that proteins are captured in SP3 due to a protein-aggregation mechanism. Thus, solvent precipitation, single-pot, solid-phase-enhanced sample preparation (SP4) is a newer clean-up technique that employs protein-aggregation to capture proteins without modified particles. SP4 has previously enriched low-solubility proteins, though differences in protein capture could affect which proteins are detected and identified. We hypothesize that the mechanisms of capture for SP3 and SP4 are distinct. Herein, we assess the proteins identified and enriched using SP3 versus SP4 for MCF7 subcellular fractions and correlate protein capture in each method to protein hydrophobicity. Our results indicate that SP3 captures more hydrophilic proteins through a combination of HILIC-like and protein-aggregation mechanisms, while SP4 captures more hydrophobic proteins through a protein-aggregation mechanism. From these results, we recommend clean-up techniques based on protein-sample hydrophobicity to yield high proteome coverage in biological samples.
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Affiliation(s)
- Jessica M. Conforti
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
| | - Amanda M. Ziegler
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
| | - Charli S. Worth
- Department of Biology, Baylor University, One Bear Place #97388, Waco, Texas 76798, United States
| | - Adhwaitha M. Nambiar
- Department of Biology, Baylor University, One Bear Place #97388, Waco, Texas 76798, United States
| | - Jacob T. Bailey
- Department of Biology, Baylor University, One Bear Place #97388, Waco, Texas 76798, United States
| | - Joseph H. Taube
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
- Department of Biology, Baylor University, One Bear Place #97388, Waco, Texas 76798, United States
| | - Elyssia S. Gallagher
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
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2
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Sheikh A, Zechmann B, Sayes CM, Taube JH, Greathouse KL. A preparation of bacterial outer membrane with osmium tetroxide and uranyl acetate co-stain enables improved structural determination by transmission electron microscopy. Microscopy (Oxf) 2023; 72:515-519. [PMID: 37148329 PMCID: PMC10673695 DOI: 10.1093/jmicro/dfad027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 04/10/2023] [Accepted: 05/04/2023] [Indexed: 05/08/2023] Open
Abstract
Biological nanoparticles, such as bacterial outer membrane vesicles (OMVs), are routinely characterized through transmission electron microscopy (TEM). In this study, we report a novel method to prepare OMVs for TEM imaging. To preserve vesicular shape and structure, we developed a dual fixation protocol involving osmium tetroxide incubation prior to negative staining with uranyl acetate. Combining osmium tetroxide with uranyl acetate resulted in preservation of sub-50 nm vesicles and improved morphological stability, enhancing characterization of lipid-based nanoparticles by TEM.
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Affiliation(s)
- Aadil Sheikh
- Department of Biology, Baylor University, One Bear Place #97046, Waco, TX 76798, USA
| | - Bernd Zechmann
- Center for Microscopy and Imaging, Baylor University, One Bear Place #97046, Waco, TX 76798, USA
| | - Christie M Sayes
- Department of Environmental Science, Baylor University, One Bear Place #97046, Waco, TX 76798, USA
| | - Joseph H Taube
- Department of Biology, Baylor University, One Bear Place #97046, Waco, TX 76798, USA
| | - K. Leigh Greathouse
- Department of Biology, Baylor University, One Bear Place #97046, Waco, TX 76798, USA
- Nutrition Sciences, Baylor University, One Bear Place #97311, Waco, TX 76798, USA
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3
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Reisenauer KN, Aroujo J, Tao Y, Ranganathan S, Romo D, Taube JH. Therapeutic vulnerabilities of cancer stem cells and effects of natural products. Nat Prod Rep 2023; 40:1432-1456. [PMID: 37103550 PMCID: PMC10524555 DOI: 10.1039/d3np00002h] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
Covering: 1995 to 2022Tumors possess both genetic and phenotypic heterogeneity leading to the survival of subpopulations post-treatment. The term cancer stem cells (CSCs) describes a subpopulation that is resistant to many types of chemotherapy and which also possess enhanced migratory and anchorage-independent growth capabilities. These cells are enriched in residual tumor material post-treatment and can serve as the seed for future tumor re-growth, at both primary and metastatic sites. Elimination of CSCs is a key goal in enhancing cancer treatment and may be aided by application of natural products in conjunction with conventional treatments. In this review, we highlight molecular features of CSCs and discuss synthesis, structure-activity relationships, derivatization, and effects of six natural products with anti-CSC activity.
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Affiliation(s)
| | - Jaquelin Aroujo
- Department of Chemistry and Biochemistry, Baylor Univesrity, Waco, TX, USA
| | - Yongfeng Tao
- Department of Chemistry and Biochemistry, Baylor Univesrity, Waco, TX, USA
| | | | - Daniel Romo
- Department of Chemistry and Biochemistry, Baylor Univesrity, Waco, TX, USA
| | - Joseph H Taube
- Department of Biology, Baylor University, Waco, TX, USA.
- Dan L. Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX, USA
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4
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Johnson KS, Hussein S, Chakraborty P, Muruganantham A, Mikhail S, Gonzalez G, Song S, Jolly MK, Toneff MJ, Benton ML, Lin YC, Taube JH. CTCF Expression and Dynamic Motif Accessibility Modulates Epithelial-Mesenchymal Gene Expression. Cancers (Basel) 2022; 14:cancers14010209. [PMID: 35008373 PMCID: PMC8750563 DOI: 10.3390/cancers14010209] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 11/22/2021] [Accepted: 11/23/2021] [Indexed: 12/14/2022] Open
Abstract
Epithelial-mesenchymal transition (EMT) and its reversal, mesenchymal-epithelial transition (MET) drive tissue reorganization critical for early development. In carcinomas, processing through EMT, MET, or partial states promotes migration, invasion, dormancy, and metastatic colonization. As a reversible process, EMT is inherently regulated at epigenetic and epigenomic levels. To understand the epigenomic nature of reversible EMT and its partial states, we characterized chromatin accessibility dynamics, transcriptomic output, protein expression, and cellular phenotypes during stepwise reversible EMT. We find that the chromatin insulating protein machinery, including CTCF, is suppressed and re-expressed, coincident with broad alterations in chromatin accessibility, during EMT/MET, and is lower in triple-negative breast cancer cell lines with EMT features. Through an analysis of chromatin accessibility using ATAC-seq, we identify that early phases of EMT are characterized by enrichment for AP-1 family member binding motifs, but also by a diminished enrichment for CTCF binding motifs. Through a loss-of-function analysis, we demonstrate that the suppression of CTCF alters cellular plasticity, strengthening the epithelial phenotype via the upregulation of epithelial markers E-cadherin/CDH1 and downregulation of N-cadherin/CDH2. Conversely, the upregulation of CTCF leads to the upregulation of EMT gene expression and an increase in mesenchymal traits. These findings are indicative of a role of CTCF in regulating epithelial-mesenchymal plasticity and gene expression.
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Affiliation(s)
- Kelsey S. Johnson
- Department of Biology, Baylor University, Waco, TX 76706, USA; (K.S.J.); (A.M.); (S.M.); (G.G.); (S.S.)
| | - Shaimaa Hussein
- Baylor Institute for Immunology Research, Baylor Scott & White, Dallas, TX 75246, USA; (S.H.); (Y.C.L.)
| | - Priyanka Chakraborty
- Centre for BioSystems Science and Engineering, Indian Institute of Science, Bangalore 560012, India; (P.C.); (M.K.J.)
| | - Arvind Muruganantham
- Department of Biology, Baylor University, Waco, TX 76706, USA; (K.S.J.); (A.M.); (S.M.); (G.G.); (S.S.)
| | - Sheridan Mikhail
- Department of Biology, Baylor University, Waco, TX 76706, USA; (K.S.J.); (A.M.); (S.M.); (G.G.); (S.S.)
| | - Giovanny Gonzalez
- Department of Biology, Baylor University, Waco, TX 76706, USA; (K.S.J.); (A.M.); (S.M.); (G.G.); (S.S.)
| | - Shuxuan Song
- Department of Biology, Baylor University, Waco, TX 76706, USA; (K.S.J.); (A.M.); (S.M.); (G.G.); (S.S.)
| | - Mohit Kumar Jolly
- Centre for BioSystems Science and Engineering, Indian Institute of Science, Bangalore 560012, India; (P.C.); (M.K.J.)
| | | | | | - Yin C. Lin
- Baylor Institute for Immunology Research, Baylor Scott & White, Dallas, TX 75246, USA; (S.H.); (Y.C.L.)
| | - Joseph H. Taube
- Department of Biology, Baylor University, Waco, TX 76706, USA; (K.S.J.); (A.M.); (S.M.); (G.G.); (S.S.)
- Dan L. Duncan Cancer Center, Houston, TX 76706, USA
- Correspondence:
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5
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Song S, Johnson KS, Lujan H, Pradhan SH, Sayes CM, Taube JH. Nanoliposomal Delivery of MicroRNA-203 Suppresses Migration of Triple-Negative Breast Cancer through Distinct Target Suppression. Noncoding RNA 2021; 7:45. [PMID: 34449670 PMCID: PMC8395754 DOI: 10.3390/ncrna7030045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 07/14/2021] [Accepted: 07/21/2021] [Indexed: 02/07/2023] Open
Abstract
Triple-negative breast cancers affect thousands of women in the United States and disproportionately drive mortality from breast cancer. MicroRNAs are small, non-coding RNAs that negatively regulate gene expression post-transcriptionally by inhibiting target mRNA translation or by promoting mRNA degradation. We have identified that miRNA-203, silenced by epithelial-mesenchymal transition (EMT), is a tumor suppressor and can promote differentiation of breast cancer stem cells. In this study, we tested the ability of liposomal delivery of miR-203 to reverse aspects of breast cancer pathogenesis using breast cancer and EMT cell lines. We show that translationally relevant methods for increasing miR-203 abundance within a target tissue affects cellular properties associated with cancer progression. While stable miR-203 expression suppresses LASP1 and survivin, nanoliposomal delivery suppresses BMI1, indicating that suppression of distinct mRNA target profiles can lead to loss of cancer cell migration.
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Affiliation(s)
- Shuxuan Song
- Department of Biology, Baylor University, Waco, TX 76706, USA; (S.S.); (K.S.J.)
| | - Kelsey S. Johnson
- Department of Biology, Baylor University, Waco, TX 76706, USA; (S.S.); (K.S.J.)
| | - Henry Lujan
- Department of Environmental Science, Baylor University, Waco, TX 76706, USA; (H.L.); (S.H.P.); (C.M.S.)
| | - Sahar H. Pradhan
- Department of Environmental Science, Baylor University, Waco, TX 76706, USA; (H.L.); (S.H.P.); (C.M.S.)
| | - Christie M. Sayes
- Department of Environmental Science, Baylor University, Waco, TX 76706, USA; (H.L.); (S.H.P.); (C.M.S.)
| | - Joseph H. Taube
- Department of Biology, Baylor University, Waco, TX 76706, USA; (S.S.); (K.S.J.)
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6
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Gayler KM, Kong K, Reisenauer K, Taube JH, Wood JL. Staurosporine Analogs Via C-H Borylation. ACS Med Chem Lett 2020; 11:2441-2445. [PMID: 33335665 DOI: 10.1021/acsmedchemlett.0c00420] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 10/06/2020] [Indexed: 12/17/2022] Open
Abstract
Staurosporine is among the most potent naturally occurring kinase inhibitors isolated to date and has served as a lead compound for numerous drug development efforts in several therapeutic areas. Herein we report that C-H borylation chemistry provides access to analogs of staurosporine that were previously inaccessible to medicinal chemists who, in the past four decades, have prepared over 1000 semisynthetic staurosporine analogs.
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Affiliation(s)
- Kevin M. Gayler
- Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, United States
| | - Ke Kong
- Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, United States
| | | | - Joseph H. Taube
- Department of Biology, Baylor University, Waco, Texas 76798, United States
| | - John L. Wood
- Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, United States
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7
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Tao Y, Reisenauer K, Masi M, Evidente A, Taube JH, Romo D. Pharmacophore-Directed Retrosynthesis Applied to Ophiobolin A: Simplified Bicyclic Derivatives Displaying Anticancer Activity. Org Lett 2020; 22:8307-8312. [PMID: 33034457 PMCID: PMC7655722 DOI: 10.1021/acs.orglett.0c02938] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Pharmacophore-directed retrosynthesis applied to ophiobolin A led to bicyclic derivatives that were synthesized and display anticancer activity. Key features of the ultimate defensive synthetic strategy include a Michael addition/facially selective protonation sequence to set the critical C6 stereocenter and a ring-closing metathesis to form the cyclooctene. Cytotoxicity assays toward a breast cancer cell line (MDA-MB-231) confirm the anticipated importance of structural complexity for selectivity (vs MCF10A cells) while C3 variations modulate stability.
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Affiliation(s)
- Yongfeng Tao
- Department of Chemistry and Biochemistry, Baylor University, 101 Bagby Ave., Waco, TX 76798, United States
| | - Keighley Reisenauer
- Department of Biology, Baylor University, 101 Bagby Ave., Waco, TX 76798, United States
| | - Marco Masi
- Dipartimentodi Scienze Chimiche, Complesso Universitario Monte Sant’ Angelo, Napoli, Italy
| | - Antonio Evidente
- Dipartimentodi Scienze Chimiche, Complesso Universitario Monte Sant’ Angelo, Napoli, Italy
| | - Joseph H. Taube
- Department of Biology, Baylor University, 101 Bagby Ave., Waco, TX 76798, United States
| | - Daniel Romo
- Department of Chemistry and Biochemistry, Baylor University, 101 Bagby Ave., Waco, TX 76798, United States
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8
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Das P, Taube JH. Regulating Methylation at H3K27: A Trick or Treat for Cancer Cell Plasticity. Cancers (Basel) 2020; 12:E2792. [PMID: 33003334 PMCID: PMC7600873 DOI: 10.3390/cancers12102792] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 09/21/2020] [Accepted: 09/23/2020] [Indexed: 12/13/2022] Open
Abstract
Properly timed addition and removal of histone 3 lysine 27 tri-methylation (H3K27me3) is critical for enabling proper differentiation throughout all stages of development and, likewise, can guide carcinoma cells into altered differentiation states which correspond to poor prognoses and treatment evasion. In early embryonic stages, H3K27me3 is invoked to silence genes and restrict cell fate. Not surprisingly, mutation or altered functionality in the enzymes that regulate this pathway results in aberrant methylation or demethylation that can lead to malignancy. Likewise, changes in expression or activity of these enzymes impact cellular plasticity, metastasis, and treatment evasion. This review focuses on current knowledge regarding methylation and de-methylation of H3K27 in cancer initiation and cancer cell plasticity.
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Affiliation(s)
| | - Joseph H. Taube
- Department of Biology, Baylor University, Waco, TX 76706, USA;
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9
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Hodges SL, Nolan SO, Tomac LA, Muhammad IDA, Binder MS, Taube JH, Lugo JN. Lipopolysaccharide-induced inflammation leads to acute elevations in pro-inflammatory cytokine expression in a mouse model of Fragile X syndrome. Physiol Behav 2019; 215:112776. [PMID: 31838149 DOI: 10.1016/j.physbeh.2019.112776] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 12/11/2019] [Accepted: 12/11/2019] [Indexed: 02/07/2023]
Abstract
Fragile X syndrome (FXS) is a neurodevelopmental disorder caused by a single genetic mutation in the Fmr1 gene, serving as the largest genetic cause of intellectual disability. Trinucleotide expansion mutations in Fmr1 result in silencing and hypermethylation of the gene, preventing synthesis of the RNA binding protein Fragile X mental retardation protein which functions as a translational repressor. Abnormal immune responses have been demonstrated to play a role in FXS pathophysiology, however, whether these alterations impact how those with FXS respond to an immune insult behaviorally is not entirely known. In the current study, we examine how Fmr1 knockout (KO) and wild type (WT) mice respond to the innate immune stimulus lipopolysaccharide (LPS), both on a molecular and behavioral level, to determine if Fmr1 mutations impact the normal physiological response to an immune insult. In response to LPS, Fmr1 KO mice had elevated hippocampal IL-1β and IL-6 mRNA levels 4 h post-treatment compared to WT mice, with no differences detected in any cytokines at baseline or between genotypes 24 h post-LPS administration. Fmr1 KO mice also had upregulated hippocampal BDNF gene expression 4 h post-treatment compared to WT mice, which was not dependent on LPS administration. There were no differences in hippocampal protein expression between genotypes in microglia (Iba1) or astrocyte (GFAP) reactivity. Further, both genotypes displayed the typical sickness response following LPS stimulation, demonstrated by a significant reduction in food burrowed by LPS-treated mice in a burrowing task. Additional investigation is critical to determine if the transient increases in cytokine expression could lead to long-term changes in downstream molecular signaling in FXS.
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Affiliation(s)
- Samantha L Hodges
- Institute of Biomedical Studies, Baylor University, Waco, TX 76798, USA
| | - Suzanne O Nolan
- Department of Psychology and Neuroscience, Baylor University, One Bear Place # 97334, Waco, TX 76798, USA
| | - Lindsay A Tomac
- Department of Psychology and Neuroscience, Baylor University, One Bear Place # 97334, Waco, TX 76798, USA
| | - Ilyasah D A Muhammad
- Department of Psychology and Neuroscience, Baylor University, One Bear Place # 97334, Waco, TX 76798, USA
| | - Matthew S Binder
- Department of Psychology and Neuroscience, Baylor University, One Bear Place # 97334, Waco, TX 76798, USA
| | - Joseph H Taube
- Institute of Biomedical Studies, Baylor University, Waco, TX 76798, USA; Department of Biology, Baylor University, Waco, TX 76798, USA
| | - Joaquin N Lugo
- Institute of Biomedical Studies, Baylor University, Waco, TX 76798, USA; Department of Psychology and Neuroscience, Baylor University, One Bear Place # 97334, Waco, TX 76798, USA; Department of Biology, Baylor University, Waco, TX 76798, USA.
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10
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Lujan H, Griffin WC, Taube JH, Sayes CM. Synthesis and characterization of nanometer-sized liposomes for encapsulation and microRNA transfer to breast cancer cells. Int J Nanomedicine 2019; 14:5159-5173. [PMID: 31371954 PMCID: PMC6632672 DOI: 10.2147/ijn.s203330] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Accepted: 05/04/2019] [Indexed: 12/16/2022] Open
Abstract
Introduction: The use of liposomes as a drug delivery carrier (DDC) for the treatment of various diseases, especially cancer, is rapidly increasing, requiring more stringent synthesis, formulation, and preservation techniques to bolster safety and efficacy. Liposomes otherwise referred to as phospholipid vesicles are self-assembled colloidal particles. When formed in either the micrometer or nanometer size range, they are ideal candidates as DDC because of their biological availability, performance, activity, and compatibility. Defining and addressing the critical quality attributes (CQAs) along the pharmaceutical production scale will enable a higher level of quality control for reproducibility. More specifically, understanding the CQAs of nanoliposomes that dictate its homogeneity and stability has the potential to widen applications in biomedical science. Methods: To this end, we designed a study that aimed to define synthesis, characterization, formulation (encapsulation), preservation, and cargo delivery and trafficking as the major components within a target product profile for nanoliposomes. A series of synthetic schemes were employed to measure physicochemical properties relevant to nanomaterial drug product development, including concentration gradients, probe versus bath sonication, and storage temperature measured by microscopy (electron and light) and dynamic light scattering. Results: Concentration was found to be a vital CQA as reducing concentrations resulted in nanometer-sized liposomes of <350 nm. Liposomes were loaded with microRNA and fluorescence spectroscopy was used to determine loading efficacy and stability over time. Lyophilization was used to create a dry powder formulation that was then assessed for stability for 6 months. Lastly, breast cancer cell lines were used to ensure efficacy of microRNA delivery and localization. Conclusion: We conclude that microRNA can be loaded into nanometer-sized liposomes, preserved for months in a dried form, and maintain encapsulation after extended time periods in storage.
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Affiliation(s)
- Henry Lujan
- Department of Environmental Science, Baylor University, Waco, TX, USA
| | - Wezley C Griffin
- Department of Biology, Baylor University, Waco, TX, USA.,Department of Chemistry and Biochemistry, Baylor University, Waco, TX, USA
| | - Joseph H Taube
- Department of Biology, Baylor University, Waco, TX, USA.,Institute for Biomedical Sciences, Baylor University, Waco, TX, USA
| | - Christie M Sayes
- Department of Environmental Science, Baylor University, Waco, TX, USA.,Institute for Biomedical Sciences, Baylor University, Waco, TX, USA
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11
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Vijay GV, Zhao N, Den Hollander P, Toneff MJ, Joseph R, Pietila M, Taube JH, Sarkar TR, Ramirez-Pena E, Werden SJ, Shariati M, Gao R, Sobieski M, Stephan CC, Sphyris N, Miura N, Davies P, Chang JT, Soundararajan R, Rosen JM, Mani SA. GSK3β regulates epithelial-mesenchymal transition and cancer stem cell properties in triple-negative breast cancer. Breast Cancer Res 2019; 21:37. [PMID: 30845991 PMCID: PMC6407242 DOI: 10.1186/s13058-019-1125-0] [Citation(s) in RCA: 80] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Accepted: 02/22/2019] [Indexed: 02/07/2023] Open
Abstract
Background Triple-negative breast cancers (TNBCs), which lack receptors for estrogen, progesterone, and amplification of epidermal growth factor receptor 2, are highly aggressive. Consequently, patients diagnosed with TNBCs have reduced overall and disease-free survival rates compared to patients with other subtypes of breast cancer. TNBCs are characterized by the presence of cancer cells with mesenchymal properties, indicating that the epithelial to mesenchymal transition (EMT) plays a major role in the progression of this disease. The EMT program has also been implicated in chemoresistance, tumor recurrence, and induction of cancer stem cell (CSC) properties. Currently, there are no targeted therapies for TNBC, and hence, it is critical to identify the novel targets to treat TNBC. Methods A library of compounds was screened for their ability to inhibit EMT in cells with mesenchymal phenotype as assessed using the previously described Z-cad reporters. Of the several drugs tested, GSK3β inhibitors were identified as EMT inhibitors. The effects of GSK3β inhibitors on the properties of TNBC cells with a mesenchymal phenotype were assessed using qRT-PCR, flow cytometry, western blot, mammosphere, and migration and cell viability assays. Publicly available datasets also were analyzed to examine if the expression of GSK3β correlates with the overall survival of breast cancer patients. Results We identified a GSK3β inhibitor, BIO, in a drug screen as one of the most potent inhibitors of EMT. BIO and two other GSK3β inhibitors, TWS119 and LiCl, also decreased the expression of mesenchymal markers in several different cell lines with a mesenchymal phenotype. Further, inhibition of GSK3β reduced EMT-related migratory properties of cells with mesenchymal properties. To determine if GSK3β inhibitors target mesenchymal-like cells by affecting the CSC population, we employed mammosphere assays and profiled the stem cell-related cell surface marker CD44+/24− in cells after exposure to GSK3β inhibitors. We found that GSK3β inhibitors indeed decreased the CSC properties of cell types with mesenchymal properties. We treated cells with epithelial and mesenchymal properties with GSK3β inhibitors and found that GSK3β inhibitors selectively kill cells with mesenchymal attributes while sparing cells with epithelial properties. We analyzed patient data to identify genes predictive of poor clinical outcome that could serve as novel therapeutic targets for TNBC. The Wnt signaling pathway is critical to EMT, but among the various factors known to be involved in Wnt signaling, only the higher expression of GSK3β correlated with poorer overall patient survival. Conclusions Taken together, our data demonstrate that GSK3β is a potential target for TNBCs and suggest that GSK3β inhibitors could serve as selective inhibitors of EMT and CSC properties for the treatment of a subset of aggressive TNBC. GSK3β inhibitors should be tested for use in combination with standard-of-care drugs in preclinical TNBC models. Electronic supplementary material The online version of this article (10.1186/s13058-019-1125-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Geraldine Vidhya Vijay
- Department of Translational Molecular Pathology, UT MD Anderson Cancer Center, Houston, TX, USA
| | - Na Zhao
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA
| | - Petra Den Hollander
- Department of Translational Molecular Pathology, UT MD Anderson Cancer Center, Houston, TX, USA
| | - Mike J Toneff
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA
| | - Robiya Joseph
- Department of Translational Molecular Pathology, UT MD Anderson Cancer Center, Houston, TX, USA
| | - Mika Pietila
- Turku Centre for Biotechnology, University of Turku, Tykistökatu 6, 20520, Turku, Finland
| | | | - Tapasree R Sarkar
- Center for Statistical Bioinformatics, Texas A&M University, College Station, TX, USA
| | - Esmeralda Ramirez-Pena
- Department of Translational Molecular Pathology, UT MD Anderson Cancer Center, Houston, TX, USA
| | - Steven J Werden
- Department of Translational Molecular Pathology, UT MD Anderson Cancer Center, Houston, TX, USA
| | - Maryam Shariati
- Department of Translational Molecular Pathology, UT MD Anderson Cancer Center, Houston, TX, USA
| | - Ruli Gao
- Department of Genetics, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Mary Sobieski
- Center for Translational Cancer Research, Texas A&M Health Science Center, Institute of Biosciences and Technology, Houston, TX, USA
| | - Clifford C Stephan
- Center for Translational Cancer Research, Texas A&M Health Science Center, Institute of Biosciences and Technology, Houston, TX, USA
| | - Nathalie Sphyris
- Department of Translational Molecular Pathology, UT MD Anderson Cancer Center, Houston, TX, USA
| | - Noayuki Miura
- Department of Biochemistry, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Peter Davies
- Center for Translational Cancer Research, Texas A&M Health Science Center, Institute of Biosciences and Technology, Houston, TX, USA
| | - Jeffrey T Chang
- Department of Integrative Biology and Pharmacology, School of Medicine, School of Biomedical Informatics, UT Health Sciences Center at Houston, Houston, TX, USA.,Center for Clinical and Translational Sciences, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Rama Soundararajan
- Department of Translational Molecular Pathology, UT MD Anderson Cancer Center, Houston, TX, USA
| | - Jeffrey M Rosen
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA.
| | - Sendurai A Mani
- Department of Translational Molecular Pathology, UT MD Anderson Cancer Center, Houston, TX, USA. .,Metastasis Research Center, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
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12
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Abstract
Abstract
The epithelial-to-mesenchymal transition (EMT) reversible cellular reprogramming event, used repeatedly throughout development, is hypothesized to be involved in the cell migration and consequently metastasis that ultimately contributes to most breast cancer-related fatalities. In this process, cuboidal epithelial cells, marked by the presence of tight junction proteins and cell-cell adhesions, lose their apicobasal polarity and acquire a spindle-like morphology and migratory traits. EMT was originally regarded to have only two states, with cells exhibiting either epithelial or mesenchymal phenotypes; however, recently, researchers have demonstrated the existence of a dual epithelial/mesenchymal state, termed hybrid- or partial-EMT. Due to its inherent plasticity, it is believed that EMT and its reversal mesenchymal-to-epithelial transition (MET) is, at least, partly regulated by epigenetic means such as alterations in chromatin structure. Assay for transposase-accessible chromatin with high-throughput sequencing (ATAC-seq) is a novel technique that employs the use of a mutant Tn5 transposase to cleave nucleosome-free DNA regions in a non-biased manner. In this investigation, we induced MCF10A mammary epithelial cells to undergo a short-term (<4 days) or long-term (>4 days) EMT. Addition and withdrawal of exogenous TGFβ1 produced partial- or full-EMT and MET conditions which were interrogated by ATAC- and RNA-seq. Hierarchical clustering of ATAC cleavage peaks revealed that pre-EMT and short- and long-term MET conditions demonstrate similar chromatin accessibility profiles with cleavage sites enriched for specific binding motifs. Notably, transcription factors typically not associated with EMT displayed dynamic enrichment in the accessible chromatin at various timepoints in our assay. Correlation with RNA-seq data reveals highly dynamic changes in gene expression suggesting dynamic and reversible use of regulatory programs. Importantly, partial-EMT cells were characterized by unique accessibility patterns, motif enrichment, and gene expression supporting the conclusion that this is not merely an intermediate but a unique state.
Citation Format: Johnson KS, Hussein S, Lin Y, Taube JH. Defining chromatin accessibility profiles of partial and reversible EMT [abstract]. In: Proceedings of the 2018 San Antonio Breast Cancer Symposium; 2018 Dec 4-8; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2019;79(4 Suppl):Abstract nr P5-08-04.
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Affiliation(s)
- KS Johnson
- Baylor University, Waco, TX; Baylor Institute for Immunology Research, Dallas, TX
| | - S Hussein
- Baylor University, Waco, TX; Baylor Institute for Immunology Research, Dallas, TX
| | - Y Lin
- Baylor University, Waco, TX; Baylor Institute for Immunology Research, Dallas, TX
| | - JH Taube
- Baylor University, Waco, TX; Baylor Institute for Immunology Research, Dallas, TX
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13
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Affiliation(s)
- Yongfeng Tao
- Department of Chemistry and BiochemistryBaylor University 101 Bagby Ave. Waco TX 76798 USA
| | | | - Joseph H. Taube
- Department of BiologyBaylor University 101 Bagby Ave. Waco TX 76798 USA
| | - Daniel Romo
- Department of Chemistry and BiochemistryBaylor University 101 Bagby Ave. Waco TX 76798 USA
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14
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Tao Y, Reisenauer K, Taube JH, Romo D. Total Synthesis and Anticancer Activity of (+)-Hypercalin C and Congeners. Angew Chem Int Ed Engl 2019; 58:2734-2738. [PMID: 30600887 DOI: 10.1002/anie.201812909] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2018] [Indexed: 11/09/2022]
Abstract
The hypercalins are dearomatized acylphloroglucinols with a pendant complex cyclopentane ring that exhibit activity against several cancer cell lines. We report the first total synthesis of (+)-hypercalin C employing a convergent strategy that enabled the dissection of the essential structural features required for the observed anticancer activity. A strategic disconnection involving an unusual C sp 3 -C sp 2 Suzuki-Miyaura coupling with an α-bromo enolether also revealed an unexpected C-H activation. This strategy targeted designed analogues along the synthetic route to address particular biological questions. These results support the hypothesis that hypercalin C may act as a proton shuttle with the dearomatized acylphloroglucinol moiety being essential for this activity.
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Affiliation(s)
- Yongfeng Tao
- Department of Chemistry and Biochemistry, Baylor University, 101 Bagby Ave., Waco, TX, 76798, USA
| | - Keighley Reisenauer
- Department of Biology, Baylor University, 101 Bagby Ave., Waco, TX, 76798, USA
| | - Joseph H Taube
- Department of Biology, Baylor University, 101 Bagby Ave., Waco, TX, 76798, USA
| | - Daniel Romo
- Department of Chemistry and Biochemistry, Baylor University, 101 Bagby Ave., Waco, TX, 76798, USA
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15
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Xiao H, Shiu PKT, Shu J, Santulli G, Gheybi MK, Conn SJ, Bogard B, Hubé F, Taube JH, Mani SA, Song L, Calin GA, Zhang S. The Non-Coding RNA Journal Club: Highlights on Recent Papers-6. Noncoding RNA 2018; 4:E23. [PMID: 30231579 PMCID: PMC6162737 DOI: 10.3390/ncrna4030023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Accepted: 09/14/2018] [Indexed: 11/29/2022] Open
Abstract
We are delighted to share with you our sixth Journal Club and highlight some of the most interesting papers published recently [...].
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Affiliation(s)
- Hua Xiao
- Division of Biological Sciences, University of Missouri, Columbia, MO 65211, USA.
| | - Patrick K T Shiu
- Division of Biological Sciences, University of Missouri, Columbia, MO 65211, USA.
| | - Jun Shu
- Department of Medicine, Einstein College of Medicine, Montefiore University Hospital, New York, NY 10461, USA.
| | - Gaetano Santulli
- Department of Medicine, Einstein College of Medicine, Montefiore University Hospital, New York, NY 10461, USA.
| | - Mohammad K Gheybi
- Flinders Centre for Innovation in Cancer, Flinders University, Adelaide 5042, Australia.
- School of Pharmacy and Medical Sciences, University of South Australia, Adelaide 5000, Australia.
| | - Simon J Conn
- Flinders Centre for Innovation in Cancer, Flinders University, Adelaide 5042, Australia.
- School of Pharmacy and Medical Sciences, University of South Australia, Adelaide 5000, Australia.
| | - Baptiste Bogard
- CNRS UMR7216, Epigenetics and Cell Fate, Université Paris Diderot, Sorbonne Paris Cité, 75013 Paris, France.
- UMR7216 Epigénétique et Destin Cellulaire, Bâtiment Lamarck B, Case Courrier 7042, 35 rue Hélène Brion, 75013 Paris, France.
| | - Florent Hubé
- CNRS UMR7216, Epigenetics and Cell Fate, Université Paris Diderot, Sorbonne Paris Cité, 75013 Paris, France.
- UMR7216 Epigénétique et Destin Cellulaire, Bâtiment Lamarck B, Case Courrier 7042, 35 rue Hélène Brion, 75013 Paris, France.
| | - Joseph H Taube
- Department of Biology, Baylor University, Waco, TX 76706, USA.
| | - Sendurai A Mani
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
| | - Luo Song
- Department of Experimental Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, TX 77054, USA.
- The University of Texas Graduate School of Biomedical Sciences, Houston, TX 77054, USA.
| | - George A Calin
- Department of Experimental Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, TX 77054, USA.
- The University of Texas Graduate School of Biomedical Sciences, Houston, TX 77054, USA.
| | - Shuxing Zhang
- Department of Experimental Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, TX 77054, USA.
- The University of Texas Graduate School of Biomedical Sciences, Houston, TX 77054, USA.
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16
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Taube JH, Sphyris N, Johnson KS, Reisenauer KN, Nesbit TA, Joseph R, Vijay GV, Sarkar TR, Bhangre NA, Song JJ, Chang JT, Lee MG, Soundararajan R, Mani SA. The H3K27me3-demethylase KDM6A is suppressed in breast cancer stem-like cells, and enables the resolution of bivalency during the mesenchymal-epithelial transition. Oncotarget 2017; 8:65548-65565. [PMID: 29029452 PMCID: PMC5630352 DOI: 10.18632/oncotarget.19214] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 04/26/2017] [Indexed: 12/13/2022] Open
Abstract
The deposition of the activating H3K4me3 and repressive H3K27me3 histone modifications within the same promoter, forming a so-called bivalent domain, maintains gene expression in a repressed but transcription-ready state. We recently reported a significantly increased incidence of bivalency following an epithelial-mesenchymal transition (EMT), a process associated with the initiation of the metastatic cascade. The reverse process, known as the mesenchymal-epithelial transition (MET), is necessary for efficient colonization. Here, we identify numerous genes associated with differentiation, proliferation and intercellular adhesion that are repressed through the acquisition of bivalency during EMT, and re-expressed following MET. The majority of EMT-associated bivalent domains arise through H3K27me3 deposition at H3K4me3-marked promoters. Accordingly, we show that the expression of the H3K27me3-demethylase KDM6A is reduced in cells that have undergone EMT, stem-like subpopulations of mammary cell lines and stem cell-enriched triple-negative breast cancers. Importantly, KDM6A levels are restored following MET, concomitant with CDH1/E-cadherin reactivation through H3K27me3 removal. Moreover, inhibition of KDM6A, using the H3K27me3-demethylase inhibitor GSK-J4, prevents the re-expression of bivalent genes during MET. Our findings implicate KDM6A in the resolution of bivalency accompanying MET, and suggest KDM6A inhibition as a viable strategy to suppress metastasis formation in breast cancer.
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Affiliation(s)
- Joseph H. Taube
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
- Department of Biology, Baylor University, Waco, Texas, USA
- Institute of Biomedical Sciences, Baylor University, Waco, Texas, USA
| | - Nathalie Sphyris
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | | | | | | | - Robiya Joseph
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Geraldine V. Vijay
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Tapasree R. Sarkar
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
- Department of Integrative Bioscience, Texas A & M University, College Station, Texas, USA
| | - Neeraja A. Bhangre
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Joon Jin Song
- Depatment of Statistical Science, Baylor University, Waco, Texas, USA
| | - Jeffrey T. Chang
- Center for Clinical and Translational Sciences, The University of Texas Health Science Center at Houston, Texas, USA
- Department of Integrative Biology and Pharmacology, The University of Texas Health Science Center at Houston, Texas, USA
| | - Min Gyu Lee
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
- Center for Cancer Epigenetics, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Rama Soundararajan
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Sendurai A. Mani
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
- Metastasis Research Center, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
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17
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Werden SJ, Sphyris N, Sarkar TR, Paranjape AN, LaBaff AM, Taube JH, Hollier BG, Ramirez-Peña EQ, Soundararajan R, den Hollander P, Powell E, Echeverria GV, Miura N, Chang JT, Piwnica-Worms H, Rosen JM, Mani SA. Phosphorylation of serine 367 of FOXC2 by p38 regulates ZEB1 and breast cancer metastasis, without impacting primary tumor growth. Oncogene 2016; 35:5977-5988. [PMID: 27292262 PMCID: PMC5114155 DOI: 10.1038/onc.2016.203] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 03/31/2016] [Accepted: 04/22/2016] [Indexed: 01/02/2023]
Abstract
Metastatic competence is contingent upon the aberrant activation of a latent embryonic program, known as the epithelial-mesenchymal transition (EMT), which bestows stem cell properties as well as migratory and invasive capabilities upon differentiated tumor cells. We recently identified the transcription factor FOXC2 as a downstream effector of multiple EMT programs, independent of the EMT-inducing stimulus, and as a key player linking EMT, stem cell traits and metastatic competence in breast cancer. As such, FOXC2 could serve as a potential therapeutic target to attenuate metastasis. However, as FOXC2 is a transcription factor, it is difficult to target by conventional means such as small-molecule inhibitors. Herein, we identify the serine/threonine-specific kinase p38 as a druggable upstream regulator of FOXC2 stability and function that elicits phosphorylation of FOXC2 at serine 367 (S367). Using an orthotopic syngeneic mouse tumor model, we make the striking observation that inhibition of p38-FOXC2 signaling selectively attenuates metastasis without impacting primary tumor growth. In this model, circulating tumor cell numbers are significantly reduced in mice treated with the p38 inhibitor SB203580, relative to vehicle-treated counterparts. Accordingly, genetic or pharmacological inhibition of p38 decreases FOXC2 protein levels, reverts the EMT phenotype and compromises stem cell attributes in vitro. We also identify the EMT-regulator ZEB1-known to directly repress E-cadherin/CDH1-as a downstream target of FOXC2, critically dependent on its activation by p38. Consistent with the notion that activation of the p38-FOXC2 signaling axis represents a critical juncture in the acquisition of metastatic competence, the phosphomimetic FOXC2(S367E) mutant is refractory to p38 inhibition both in vitro and in vivo, whereas the non-phosphorylatable FOXC2(S367A) mutant fails to elicit EMT and upregulate ZEB1. Collectively, our data demonstrate that FOXC2 regulates EMT, stem cell traits, ZEB1 expression and metastasis in a p38-dependent manner, and attest to the potential utility of p38 inhibitors as antimetastatic agents.
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Affiliation(s)
- S J Werden
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - N Sphyris
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - T R Sarkar
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - A N Paranjape
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - A M LaBaff
- Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - J H Taube
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - B G Hollier
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - E Q Ramirez-Peña
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - R Soundararajan
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - P den Hollander
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - E Powell
- Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - G V Echeverria
- Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - N Miura
- Department of Biochemistry, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - J T Chang
- Department of Integrative Biology and Pharmacology, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - H Piwnica-Worms
- Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - J M Rosen
- Program in Developmental Biology, Baylor College of Medicine, Houston, TX, USA
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA
| | - S A Mani
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
- Metastasis Research Center, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
- Center for Stem Cell and Developmental Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
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18
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Gautheret D, Taube JH, Mani SA, Santulli G, Cuerda-Gil D, Slotkin RK, Zhang B, Wang Y, Salzman DW, Weidhaas JB. Erratum: The Non-Coding RNA Journal Club: Highlights on Recent Papers-4. Non-Coding RNA 2016, 2, 9. Noncoding RNA 2016; 2:E10. [PMID: 29657269 PMCID: PMC5831929 DOI: 10.3390/ncrna2040010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 09/28/2016] [Indexed: 11/30/2022] Open
Abstract
Please note that in the published editorial [1], affiliations 1, and 8 contained errors.[...].
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Affiliation(s)
- Daniel Gautheret
- Institute for Integrative Biology of the Cell CNRS, CEA, Universite Paris-Sud. 91198 Gif sur Yvette, France.
| | - Joseph H Taube
- Department of Biology, Baylor University, Waco, Texas, USA.
| | - Sendurai A Mani
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
- Metastasis Research Center, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
| | - Gaetano Santulli
- College of Physicians & Surgeons, Columbia University Medical Center, 1150 St Nicholas Avenue, New York, NY 10032, USA.
| | - Diego Cuerda-Gil
- Department of Molecular Genetics, Ohio State University, 570 Aronoff Laboratory, 318 West 12th Avenue, Columbus, OH 43210, USA.
| | - R Keith Slotkin
- Department of Molecular Genetics, Ohio State University, 570 Aronoff Laboratory, 318 West 12th Avenue, Columbus, OH 43210, USA.
| | - Bo Zhang
- Key Laboratory of RNA Biology, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.
| | - Yanli Wang
- Key Laboratory of RNA Biology, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.
| | - David W Salzman
- Department of Radiation Oncology, UCLA David Geffen School of Medicine, Professor, Director, Translational Research, Los Angeles, California 90024, USA.
| | - Joanne B Weidhaas
- Department of Radiation Oncology, UCLA David Geffen School of Medicine, Professor, Director, Translational Research, Los Angeles, California 90024, USA.
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19
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Paranjape AN, Soundararajan R, Werden SJ, Joseph R, Taube JH, Bhangre N, Liu H, Rodriguez-Canales J, Wistuba II, Chang JT, Tang DG, Mahajan N, Mahajan K, Miura N, Mani SA. Abstract 4065: Delineating the role of epithelial-mesenchymal transition in the generation and maintenance of prostate cancer stem cells. Cancer Res 2015. [DOI: 10.1158/1538-7445.am2015-4065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Prostate cancer cells depend on androgens for growth and survival. While androgen-deprivation-therapy (ADT) results in regression of the tumor bulk, in many cases, the cancers recur in aggressive androgen-independent forms that are also resistant to standard-of-care therapies. The prevailing hypothesis is that pre-existing androgen-independent prostate cancer (PCa) stem-cells in the primary tumor are selectively enriched following therapy. However, we have previously shown that induction of epithelial-mesenchymal-transition (EMT) in differentiated breast epithelial cells can result in the generation of cells with stem-cell properties. In the current study, we investigated if induction of EMT in PCa promotes stem-cell features and androgen-receptor (AR) regulation, and if targeting EMT-promoting pathways renders PCa stem-cells sensitive to ADT.
We found that LNCaP-PSAlow cells, which were previously shown to represent the PCa stem-cell population, exhibit EMT properties. Induction of EMT through over-expression of EMT-inducing transcription factors or with TGFβ1 treatment, significantly stimulated stem-cell properties in the androgen-sensitive LNCaP cells, whereas inhibition of EMT in the androgen-insensitive DU145 cells using targeted shRNA or a specific TGFβ1-signaling inhibitor, resulted in markedly reduced stemness. We observed that FOXC2 expression consistently correlated with induction of EMT and androgen-insensitivity in PCa cells. Our study demonstrates that targeting EMT-inducing molecules and signaling pathways could represent a tangible approach to inhibiting the generation and maintenance of therapy-resistant PCa stem-cells, that are the prime harbingers of tumor recurrence.
Citation Format: Anurag N. Paranjape, Rama Soundararajan, Steven J. Werden, Robiya Joseph, Joseph H. Taube, Neeraja Bhangre, Hui Liu, Jaime Rodriguez-Canales, Ignacio I. Wistuba, Jeffrey T. Chang, Dean G. Tang, Nupam Mahajan, Kiran Mahajan, Naoyuki Miura, Sendurai A. Mani. Delineating the role of epithelial-mesenchymal transition in the generation and maintenance of prostate cancer stem cells. [abstract]. In: Proceedings of the 106th Annual Meeting of the American Association for Cancer Research; 2015 Apr 18-22; Philadelphia, PA. Philadelphia (PA): AACR; Cancer Res 2015;75(15 Suppl):Abstract nr 4065. doi:10.1158/1538-7445.AM2015-4065
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Affiliation(s)
| | | | | | | | | | | | - Hui Liu
- 1MD Anderson Cancer Center, Houston, TX
| | | | | | | | | | - Nupam Mahajan
- 4H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL
| | - Kiran Mahajan
- 4H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL
| | - Naoyuki Miura
- 5Hamamatsu University School of Medicine, Hamamatsu, Japan
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20
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Ferracin M, Gautheret D, Hubé F, Mani SA, Mattick JS, Ørom UA, Santulli G, Slotkin RK, Szweykowska-Kulinska Z, Taube JH, Vazquez F, Yang JH. The Non-Coding RNA Journal Club: Highlights on Recent Papers. Noncoding RNA 2015. [PMCID: PMC5932541 DOI: 10.3390/ncrna1010087] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- Manuela Ferracin
- Department of Morphology, Pathology Oncology and Experimental Biology Section, University of Ferrara, Ferrara 44121, Italy; E-Mail:
- Laboratory for Technologies of Advanced Therapies, University of Ferrara, 44121 Ferrara, Italy
| | - Daniel Gautheret
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, 91198 Gif sur Yvette, France; E-Mail:
| | - Florent Hubé
- CNRS UMR7216, Epigenetics and Cell Fate, Université Paris Diderot, Sorbonne Paris Cité, Bâtiment Lamarck B, Case Courrier 7042, 35 rue Hélène Brion, 75013 Paris, France; E-Mail:
| | - Sendurai A. Mani
- Department of Molecular Pathology, The University of Texas MD Anderson Cancer Center, 77054 Houston, TX, USA; E-Mails: (S.A.M.); (J.T.)
| | - John S. Mattick
- Garvan Institute of Medical Research, Sydney, New South Wales, Australia, and St Vincent’s Clinical School, University of New South Wales, Sydney, 2010 New South Wales, Australia; E-Mail:
| | - Ulf Andersson Ørom
- Noncoding RNA Research Group, Max Planck Institute for Molecular Genetics, 14195 Berlin, Germany; E-Mail:
| | - Gaetano Santulli
- Department of Physiology and Cellular Biophysics, Clyde and Helen Wu Center for Molecular Cardiology, College of Physicians and Surgeons, Columbia University Medical Center, New York, 10032 NY, USA; E-Mail:
| | - R. Keith Slotkin
- Department of Molecular Genetics, The Ohio State University, Columbus, 43210 OH, USA; E-Mail:
| | - Zofia Szweykowska-Kulinska
- Department of Gene Expression, Faculty of Biology, Institute of Molecular Biology and Biotechnology, Adam Mickiewicz University, Umultowska 89, 61-614 Poznan, Poland; E-Mail:
| | - Joseph H. Taube
- Department of Molecular Pathology, The University of Texas MD Anderson Cancer Center, 77054 Houston, TX, USA; E-Mails: (S.A.M.); (J.T.)
| | - Franck Vazquez
- MDPI AG, Non-Coding RNA Editorial Office; Klybeckstrasse 64, 4057 Basel, Switzerland
- Author to whom correspondence should be addressed; E-Mail:
| | - Jian-Hua Yang
- Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory for Biocontrol, Sun Yat-sen University, 510275 Guangzhou, China; E-Mail:
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21
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Sarkar TR, Battula VL, Werden SJ, Vijay GV, Ramirez-Peña EQ, Taube JH, Chang JT, Miura N, Porter W, Sphyris N, Andreeff M, Mani SA. GD3 synthase regulates epithelial-mesenchymal transition and metastasis in breast cancer. Oncogene 2014; 34:2958-67. [PMID: 25109336 DOI: 10.1038/onc.2014.245] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2013] [Revised: 06/04/2014] [Accepted: 06/20/2014] [Indexed: 12/14/2022]
Abstract
The epithelial-mesenchymal transition (EMT) bestows cancer cells with increased stem cell properties and metastatic potential. To date, multiple extracellular stimuli and transcription factors have been shown to regulate EMT. Many of them are not druggable and therefore it is necessary to identify targets, which can be inhibited using small molecules to prevent metastasis. Recently, we identified the ganglioside GD2 as a novel breast cancer stem cell marker. Moreover, we found that GD3 synthase (GD3S)--an enzyme involved in GD2 biosynthesis--is critical for GD2 production and could serve as a potential druggable target for inhibiting tumor initiation and metastasis. Indeed, there is a small molecule known as triptolide that has been shown to inhibit GD3S function. Accordingly, in this manuscript, we demonstrate that the inhibition of GD3S using small hairpin RNA or triptolide compromises the initiation and maintenance of EMT instigated by various signaling pathways, including Snail, Twist and transforming growth factor-β1 as well as the mesenchymal characteristics of claudin-low breast cancer cell lines (SUM159 and MDA-MB-231). Moreover, GD3S is necessary for wound healing, migration, invasion and stem cell properties in vitro. Most importantly, inhibition of GD3S in vivo prevents metastasis in experimental as well as in spontaneous syngeneic wild-type mouse models. We also demonstrate that the transcription factor FOXC2, a central downstream effector of several EMT pathways, directly regulates GD3S expression by binding to its promoter. In clinical specimens, the expression of GD3S correlates with poor prognosis in triple-negative human breast tumors. Moreover, GD3S expression correlates with activation of the c-Met signaling pathway leading to increased stem cell properties and metastatic competence. Collectively, these findings suggest that the GD3S-c-Met axis could serve as an effective target for the treatment of metastatic breast cancers.
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Affiliation(s)
- T R Sarkar
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - V L Battula
- Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - S J Werden
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - G V Vijay
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - E Q Ramirez-Peña
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - J H Taube
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - J T Chang
- Department of Integrative Biology and Pharmacology, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - N Miura
- Department of Biochemistry, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - W Porter
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX, USA
| | - N Sphyris
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - M Andreeff
- Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - S A Mani
- 1] Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA [2] Metastasis Research Center, The University of Texas MD Anderson Cancer Center, Houston, TX, USA [3] Center for Stem Cells and Developmental Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
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22
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Malouf GG, Taube JH, Lu Y, Roysarkar T, Panjarian S, Estecio MR, Jelinek J, Yamazaki J, Raynal NJM, Long H, Tahara T, Tinnirello A, Ramachandran P, Zhang XY, Liang S, Mani SA, Issa JPJ. Architecture of epigenetic reprogramming following Twist1-mediated epithelial-mesenchymal transition. Genome Biol 2013; 14:R144. [PMID: 24367927 PMCID: PMC4053791 DOI: 10.1186/gb-2013-14-12-r144] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Accepted: 12/24/2013] [Indexed: 12/21/2022] Open
Abstract
Background Epithelial-mesenchymal transition (EMT) is known to impart metastasis and stemness characteristics in breast cancer. To characterize the epigenetic reprogramming following Twist1-induced EMT, we characterized the epigenetic and transcriptome landscapes using whole-genome transcriptome analysis by RNA-seq, DNA methylation by digital restriction enzyme analysis of methylation (DREAM) and histone modifications by CHIP-seq of H3K4me3 and H3K27me3 in immortalized human mammary epithelial cells relative to cells induced to undergo EMT by Twist1. Results EMT is accompanied by focal hypermethylation and widespread global DNA hypomethylation, predominantly within transcriptionally repressed gene bodies. At the chromatin level, the number of gene promoters marked by H3K4me3 increases by more than one fifth; H3K27me3 undergoes dynamic genomic redistribution characterized by loss at half of gene promoters and overall reduction of peak size by almost half. This is paralleled by increased phosphorylation of EZH2 at serine 21. Among genes with highly altered mRNA expression, 23.1% switch between H3K4me3 and H3K27me3 marks, and those point to the master EMT targets and regulators CDH1, PDGFRα and ESRP1. Strikingly, Twist1 increases the number of bivalent genes by more than two fold. Inhibition of the H3K27 methyltransferases EZH2 and EZH1, which form part of the Polycomb repressive complex 2 (PRC2), blocks EMT and stemness properties. Conclusions Our findings demonstrate that the EMT program requires epigenetic remodeling by the Polycomb and Trithorax complexes leading to increased cellular plasticity. This suggests that inhibiting epigenetic remodeling and thus decrease plasticity will prevent EMT, and the associated breast cancer metastasis.
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23
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Zarkoob H, Taube JH, Singh SK, Mani SA, Kohandel M. Investigating the link between molecular subtypes of glioblastoma, epithelial-mesenchymal transition, and CD133 cell surface protein. PLoS One 2013; 8:e64169. [PMID: 23734191 PMCID: PMC3667082 DOI: 10.1371/journal.pone.0064169] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2011] [Accepted: 04/12/2013] [Indexed: 11/18/2022] Open
Abstract
In this manuscript, we use genetic data to provide a three-faceted analysis on the links between molecular subclasses of glioblastoma, epithelial-to-mesenchymal transition (EMT) and CD133 cell surface protein. The contribution of this paper is three-fold: First, we use a newly identified signature for epithelial-to-mesenchymal transition in human mammary epithelial cells, and demonstrate that genes in this signature have significant overlap with genes differentially expressed in all known GBM subtypes. However, the overlap between genes up regulated in the mesenchymal subtype of GBM and in the EMT signature was more significant than other GBM subtypes. Second, we provide evidence that there is a negative correlation between the genetic signature of EMT and that of CD133 cell surface protein, a putative marker for neural stem cells. Third, we study the correlation between GBM molecular subtypes and the genetic signature of CD133 cell surface protein. We demonstrate that the mesenchymal and neural subtypes of GBM have the strongest correlations with the CD133 genetic signature. While the mesenchymal subtype of GBM displays similarity with the signatures of both EMT and CD133, it also exhibits some differences with each of these signatures that are partly due to the fact that the signatures of EMT and CD133 are inversely related to each other. Taken together these data shed light on the role of the mesenchymal transition and neural stem cells, and their mutual interaction, in molecular subtypes of glioblastoma multiforme.
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Affiliation(s)
- Hadi Zarkoob
- Department of Applied Mathematics, University of Waterloo, Waterloo, Ontario, Canada
| | - Joseph H. Taube
- Department of Translational Molecular Pathology, University of Texas, MD Anderson Cancer Center, Houston, Texas, United States of America
| | - Sheila K. Singh
- McMaster Stem Cell and Cancer Research Institute, Michael DeGroote Centre for Learning and Discovery, Hamilton, Ontario, Canada
- Department of Surgery, McMaster University, Hamilton, Ontario, Canada
| | - Sendurai A. Mani
- Department of Translational Molecular Pathology, University of Texas, MD Anderson Cancer Center, Houston, Texas, United States of America
- Metastasis Research Center, University of Texas, MD Anderson Cancer Center, Houston, Texas, United States of America
| | - Mohammad Kohandel
- Department of Applied Mathematics, University of Waterloo, Waterloo, Ontario, Canada
- Centre for Mathematical Medicine, Fields Institute, Toronto, Ontario, Canada
- * E-mail:
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24
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Hollier BG, Tinnirello AA, Werden SJ, Evans KW, Taube JH, Sarkar TR, Sphyris N, Shariati M, Kumar SV, Battula VL, Herschkowitz JI, Guerra R, Chang JT, Miura N, Rosen JM, Mani SA. FOXC2 expression links epithelial-mesenchymal transition and stem cell properties in breast cancer. Cancer Res 2013; 73:1981-92. [PMID: 23378344 DOI: 10.1158/0008-5472.can-12-2962] [Citation(s) in RCA: 206] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Resistance to chemotherapy and metastases are the major causes of breast cancer-related mortality. Moreover, cancer stem cells (CSC) play critical roles in cancer progression and treatment resistance. Previously, it was found that CSC-like cells can be generated by aberrant activation of epithelial-mesenchymal transition (EMT), thereby making anti-EMT strategies a novel therapeutic option for treatment of aggressive breast cancers. Here, we report that the transcription factor FOXC2 induced in response to multiple EMT signaling pathways as well as elevated in stem cell-enriched factions is a critical determinant of mesenchymal and stem cell properties, in cells induced to undergo EMT- and CSC-enriched breast cancer cell lines. More specifically, attenuation of FOXC2 expression using lentiviral short hairpin RNA led to inhibition of the mesenchymal phenotype and associated invasive and stem cell properties, which included reduced mammosphere-forming ability and tumor initiation. Whereas, overexpression of FOXC2 was sufficient to induce CSC properties and spontaneous metastasis in transformed human mammary epithelial cells. Furthermore, a FOXC2-induced gene expression signature was enriched in the claudin-low/basal B breast tumor subtype that contains EMT and CSC features. Having identified PDGFR-β to be regulated by FOXC2, we show that the U.S. Food and Drug Administration-approved PDGFR inhibitor, sunitinib, targets FOXC2-expressing tumor cells leading to reduced CSC and metastatic properties. Thus, FOXC2 or its associated gene expression program may provide an effective target for anti-EMT-based therapies for the treatment of claudin-low/basal B breast tumors or other EMT-/CSC-enriched tumors.
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Affiliation(s)
- Brett G Hollier
- Department of Translational Molecular Pathology, University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA
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25
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Taube JH, Allton K, Duncan SA, Shen L, Barton MC. Foxa1 functions as a pioneer transcription factor at transposable elements to activate Afp during differentiation of embryonic stem cells. J Biol Chem 2010; 285:16135-44. [PMID: 20348100 DOI: 10.1074/jbc.m109.088096] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Epigenetic control of genes that are silent in embryonic stem cells, but destined for expression during differentiation, includes distinctive hallmarks, such as simultaneous activating/repressing (bivalent) modifications of chromatin and DNA hypomethylation at enhancers of gene expression. Although alpha-fetoprotein (Afp) falls into this class of genes, as it is silent in pluripotent stem cells and activated during differentiation of endoderm, we find that Afp chromatin lacks bivalent histone modifications. However, critical regulatory sites for Afp activation, overlapping Foxa1/p53/Smad-binding elements, are located within a 300-bp region lacking DNA methylation, due to transposed elements underrepresented in CpG sequences: a short interspersed transposable element and a medium reiterated sequence 1 element. Forkhead family member Foxa1 is activated by retinoic acid treatment of embryonic stem cells, binds its DNA consensus site within the short interspersed transposable/medium reiterated sequence 1 elements, and displaces linker histone H1 from silent Afp chromatin. Small interfering RNA depletion of Foxa1 showed that Foxa1 is essential in providing chromatin access to transforming growth factor beta-activated Smad2 and Smad4 and their subsequent DNA binding. Together these transcription factors establish highly acetylated chromatin and promote expression of Afp. Foxa1 acts as a pioneer transcription factor in de novo activation of Afp, by exploiting a lack of methylation at juxtaposed transposed elements, to bind and poise chromatin for intersection with transforming growth factor beta signaling during differentiation of embryonic stem cells.
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Affiliation(s)
- Joseph H Taube
- Department of Biochemistry and Molecular Biology, Graduate School of Biomedical Sciences, Center for Stem Cell and Developmental Biology, University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA
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26
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Cui R, Nguyen TT, Taube JH, Stratton SA, Feuerman MH, Barton MC. Family members p53 and p73 act together in chromatin modification and direct repression of alpha-fetoprotein transcription. J Biol Chem 2005; 280:39152-60. [PMID: 16203738 DOI: 10.1074/jbc.m504655200] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Aberrant expression of the alpha-fetoprotein (AFP) gene is a diagnostic tumor marker of hepatocellular carcinoma. We find that AFP gene expression is repressed by the TP53 family member p73 during normal hepatic development and when p73alpha or p73beta is introduced into cultured hepatoma cells that express AFP. Transient co-transfection of p53 family members showed that p53 and transactivating (TA)-p73, but not TA-p63, repress endogenous AFP transcription additively or independently. p53-independent functions of p73 are further supported by delayed, p73-associated compensation of AFP repression during development of the p53-null mouse. Chromatin immunoprecipitation assays of normal and p53-null mouse liver tissue showed that TA-p73 binds at a previously identified p53 repressor site (-860/-830) within the distal promoter of AFP at a level equivalent to p53 in wild type liver, with increased binding of TA-p73 to chromatin in the absence of p53. Sequential chromatin immunoprecipitation analyses revealed that TA-p73 and p53 bind simultaneously to their shared regulatory site in wild type liver. Like the founding family member p53, TA-p73 represses AFP expression by chromatin structure alteration, targeting reduction of acetylated histone H3 lysine 9 and increased dimethylated histone H3 lysine 9 levels. However, chromatin-bound TA-p73 is associated with elevated di- and tri-methylated histone H3 lysine 4 levels in p53-null liver and hepatoma cells, concomitant with a reduced ability to repress transcription compared with p53.
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Affiliation(s)
- Rutao Cui
- Department of Biochemistry and Molecular Biology, Program in Genes and Development, Graduate School of Biological Sciences, University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, USA
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