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Schuster EF, Lopez-Knowles E, Alataki A, Zabaglo L, Folkerd E, Evans D, Sidhu K, Cheang MCU, Tovey H, Salto-Tellez M, Maxwell P, Robertson J, Smith I, Bliss JM, Dowsett M. Molecular profiling of aromatase inhibitor sensitive and resistant ER+HER2- postmenopausal breast cancers. Nat Commun 2023; 14:4017. [PMID: 37419892 PMCID: PMC10328947 DOI: 10.1038/s41467-023-39613-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 06/15/2023] [Indexed: 07/09/2023] Open
Abstract
Aromatase inhibitors (AIs) reduce recurrences and mortality in postmenopausal patients with oestrogen receptor positive (ER+) breast cancer (BC), but >20% of patients will eventually relapse. Given the limited understanding of intrinsic resistance in these tumours, here we conduct a large-scale molecular analysis to identify features that impact on the response of ER + HER2- BC to AI. We compare the 15% of poorest responders (PRs, n = 177) as measured by proportional Ki67 changes after 2 weeks of neoadjuvant AI to good responders (GRs, n = 190) selected from the top 50% responders in the POETIC trial and matched for baseline Ki67 categories. In this work, low ESR1 levels are associated with poor response, high proliferation, high expression of growth factor pathways and non-luminal subtypes. PRs having high ESR1 expression have similar proportions of luminal subtypes to GRs but lower plasma estradiol levels, lower expression of estrogen response genes, higher levels of tumor infiltrating lymphocytes and immune markers, and more TP53 mutations.
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Affiliation(s)
- Eugene F Schuster
- The Breast Cancer Now Toby Robins Research Centre at the Institute of Cancer Research, London, UK.
- Ralph Lauren Centre for Breast Cancer Research, Royal Marsden Hospital, London, UK.
| | - Elena Lopez-Knowles
- The Breast Cancer Now Toby Robins Research Centre at the Institute of Cancer Research, London, UK
- Ralph Lauren Centre for Breast Cancer Research, Royal Marsden Hospital, London, UK
| | - Anastasia Alataki
- The Breast Cancer Now Toby Robins Research Centre at the Institute of Cancer Research, London, UK
- Ralph Lauren Centre for Breast Cancer Research, Royal Marsden Hospital, London, UK
| | | | - Elizabeth Folkerd
- The Breast Cancer Now Toby Robins Research Centre at the Institute of Cancer Research, London, UK
- Ralph Lauren Centre for Breast Cancer Research, Royal Marsden Hospital, London, UK
| | | | | | - Maggie Chon U Cheang
- Clinical Trials and Statistics Unit, Division of Clinical Studies, The Institute of Cancer Research, London, UK
| | - Holly Tovey
- Clinical Trials and Statistics Unit, Division of Clinical Studies, The Institute of Cancer Research, London, UK
| | - Manuel Salto-Tellez
- Precision Medicine Centre of Excellence, The Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Belfast, UK
- Cellular Pathology, Belfast Health and Social Care Trust, Belfast City Hospital, Belfast, UK
- Division of Molecular Pathology, The Institute of Cancer Research, London, UK
| | - Perry Maxwell
- Precision Medicine Centre of Excellence, The Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Belfast, UK
| | - John Robertson
- Faculty of Medicine & Health Sciences, Queen's Medical Centre, Nottingham, UK
| | | | - Judith M Bliss
- Clinical Trials and Statistics Unit, Division of Clinical Studies, The Institute of Cancer Research, London, UK
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Yu C, Li C, Pan H, Li T, He S. Preparation of 2-Methoxyestradiol Self-emulsified Drug Delivery System and the Effect on Combination Therapy with Doxorubicin Against MCF-7/ADM Cells. AAPS PharmSciTech 2022; 23:147. [PMID: 35585431 DOI: 10.1208/s12249-022-02298-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 05/03/2022] [Indexed: 12/18/2022] Open
Abstract
Due to the poor solubility and bioavailability of 2-methoxyestradiol (2-ME), 2-ME emulsified drug delivery system (2-ME-SEDDS) was designed and characterized. After dilution with 5% glucose, 2-ME-SEDDS formed fine emulsions with mean diameter of 171 ± 14 nm and zeta potential of - 7.4 ± 0.6 mV. The cytotoxicity of 2-ME-SEDDS against MCF-7 and MCF-7/ADM cells was considerable to that of free 2-ME, and the half maximal inhibitory concentration ran up to 195 µg/mL on MCF-7/ADM cells. In order to gain a satisfactory inhibition effect on MCF-7/ADM cells, 2-ME-SEDDS combined with doxorubicin was used. It is worth noting that the combination of 2-ME-SEDDS and doxorubicin displayed a superior synergistic effect with a combined index of 0.62. And the cellular uptake of doxorubicin by MCF-7/ADM cells in the combination group was significantly higher than that of doxorubicin treatment group. The study preliminarily suggested that 2-ME-SEDDS could increase the cellular uptake of doxorubicin by MCF-7/ADM cells and the synergistic effect may be attributed to the increased cellular uptake of doxorubicin under the influence of 2-ME-SEDDS. In conclusion, SEDDS was an alternative and promising formulation for 2-ME. The combination therapy with synergistic effect by the combination of 2-ME-SEDDS and doxorubicin seems to be a promising strategy to potentiate anti-tumor efficiency against MCF-7/ADM, even other multidrug resistance tumors.
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Role of the Mediator Complex and MicroRNAs in Breast Cancer Etiology. Genes (Basel) 2022; 13:genes13020234. [PMID: 35205279 PMCID: PMC8871970 DOI: 10.3390/genes13020234] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 01/17/2022] [Accepted: 01/19/2022] [Indexed: 12/16/2022] Open
Abstract
Transcriptional coactivators play a key role in RNA polymerase II transcription and gene regulation. One of the most important transcriptional coactivators is the Mediator (MED) complex, which is an evolutionary conserved large multiprotein complex. MED transduces the signal between DNA-bound transcriptional activators (gene-specific transcription factors) to the RNA polymerase II transcription machinery to activate transcription. It is known that MED plays an essential role in ER-mediated gene expression mainly through the MED1 subunit, since estrogen receptor (ER) can interact with MED1 by specific protein–protein interactions; therefore, MED1 plays a fundamental role in ER-positive breast cancer (BC) etiology. Additionally, other MED subunits also play a role in BC etiology. On the other hand, microRNAs (miRNAs) are a family of small non-coding RNAs, which can regulate gene expression at the post-transcriptional level by binding in a sequence-specific fashion at the 3′ UTR of the messenger RNA. The miRNAs are also important factors that influence oncogenic signaling in BC by acting as both tumor suppressors and oncogenes. Moreover, miRNAs are involved in endocrine therapy resistance of BC, specifically to tamoxifen, a drug that is used to target ER signaling. In metazoans, very little is known about the transcriptional regulation of miRNA by the MED complex and less about the transcriptional regulation of miRNAs involved in BC initiation and progression. Recently, it has been shown that MED1 is able to regulate the transcription of the ER-dependent miR-191/425 cluster promoting BC cell proliferation and migration. In this review, we will discuss the role of MED1 transcriptional coactivator in the etiology of BC and in endocrine therapy-resistance of BC and also the contribution of other MED subunits to BC development, progression and metastasis. Lastly, we identified miRNAs that potentially can regulate the expression of MED subunits.
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An J, Yao W, Tang W, Jiang J, Shang Y. Hormesis Effect of Methyl Triclosan on Cell Proliferation and Migration in Human Hepatocyte L02 Cells. ACS OMEGA 2021; 6:18904-18913. [PMID: 34337230 PMCID: PMC8320140 DOI: 10.1021/acsomega.1c02127] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Accepted: 07/01/2021] [Indexed: 05/26/2023]
Abstract
Methyl triclosan (mTCS) is a methylated derivative of triclosan (TCS), which is extensively used as an antimicrobial component of various nursing products and disinfectants. Current research studies of mTCS mainly focused on the environmental persistence and bioaccumulation potential. Knowledge regarding the toxicity and carcinogenicity of mTCS is limited until now. In this study, the human hepatocyte L02 cells were used to investigate the cellular effects of mTCS under different concentrations (0.1-60 μM). The hormesis effect was observed where a low dose of mTCS (≤5 μM) exposure stimulated the cell proliferation ability, while high-dose exposure (≥20 μM) inhibited cell proliferation. In the same time, low doses of mTCS (0.5 and 1 μM) induced enhanced anchorage-independent proliferation ability and cell migration ability, indicating a positive effect on malignant transformation in L02 cells. Moreover, reactive oxygen species productions were significantly increased after mTCS exposure (≥1 μM), as compared with the control group. Furthermore, expressions of tumor-related genes, mouse double minute 2 (MDM2), matrix metalloproteinase 9 (MMP9), and proliferating cell nuclear antigen (PCNA), and proto-oncogene MYC (c-Myc), Jun, and FosB were significantly upregulated, while no significant changes were observed on expressions of apoptosis-related and cell cycle-related genes in L02 cells after exposure of low-dose mTCS. In conclusion, these results indicated that a low dose of mTCS had a hormesis effect in L02 cells on cell proliferation and malignant transformation in vitro, which might be mediated through oxidative stress response.
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Hashemi‐Gorji F, Fardaei M, Tabei SMB, Miryounesi M. Novel mutation in the MED23 gene for intellectual disability: A case report and literature review. Clin Case Rep 2019; 7:331-335. [PMID: 30847200 PMCID: PMC6389469 DOI: 10.1002/ccr3.1942] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 11/05/2018] [Accepted: 11/08/2018] [Indexed: 01/19/2023] Open
Abstract
MED23 deficiency causes the autosomal recessive Intellectual Disability (ID). Here we report an Iranian case with nonsyndromic ID presenting with developmental delay, microcephaly, hypotonia, severe ID, speech delay, and spasticity, who was homozygous for the novel MED23 c.670C>G variant. These results expand the clinical and mutation spectrum of MED23 deficiency.
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Affiliation(s)
| | - Majid Fardaei
- Department of Medical Genetics, School of MedicineShiraz University of Medical SciencesShirazIran
| | | | - Mohammad Miryounesi
- Genomic Research CenterShahid Beheshti University of Medical SciencesTehranIran
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