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https://www.readbyqxmd.com/read/28435399/serum-atrial-natriuretic-peptide-a-suspected-biomarker-of-breast-cancer
#1
Maha E Houssen, Hayam F Ghazy, Kamel Farag, Mona Abo Bakr El-Hussiny, Mohamed A El Ghaffar, Sahar Alsayed Mohamed Alsayed, Omar Farouk
AIM OF THE STUDY: To assess serum levels of ANP in breast cancer female patients and its relationship to metastasis and some clinical parameters among those patients. MATERIAL AND METHODS: One hundred breast cancer patients with and without metastasis along with 20 healthy closely matched controls, were enrolled in the present cross sectional study. Background: To assess the serum levels of atrial natriuretic peptide in breast cancer Serum levels of ANP were assessed using ELISA...
2017: Contemporary Oncology Współczesna Onkologia
https://www.readbyqxmd.com/read/28433540/er-%C3%AE-36-interactions-with-cytosolic-molecular-network-in-acquired-tamoxifen-resistance
#2
REVIEW
Azin Teymourzadeh, Sepideh Mansouri, Leila Farahmand, Aysooda Hosseinzade, Keivan Majidzadeh-A
According to the World Health Organization (WHO) published data in 2015; breast cancer is the most prevalent and the second leading cause of cancer death among females. As approximately 70% of breast cancer tumor cells are estrogen receptor (ER) positive, primary therapeutic agents such as Anti-estrogens were produced mostly in a way to target this receptor. Anti-estrogen therapies mostly target Estrogen receptor and block its underlying signaling pathways. Nevertheless, resistance to these agents made the condition more complicated...
March 30, 2017: Clinical Breast Cancer
https://www.readbyqxmd.com/read/28431397/sensitization-of-tamoxifen-resistant-breast-cancer-cells-by-z-ligustilide-through-inhibiting-autophagy-and-accumulating-dna-damages
#3
Hongyi Qi, Zhuyun Jiang, Chengqiang Wang, Yi Yang, Li Li, Hui He, Zanyang Yu
Autophagy plays a pro-survival role in the tamoxifen-resistant breast cancer cells. Herein we found that autophagy was concomitantly induced in tamoxifen-resistant MCF-7 (MCF-7TR5) cells through the dissociation of Bcl-2 from Beclin 1 and subsequent enhancement of interaction among the ATG14-Beclin1-PI3KC3 complex. Moreover, higher level of DNA damage was observed in MCF-7TR5 cells with the decreased BRCA1 and RAD51 level and the increased Ku80 level. Interestingly, Nur77 was selectively degraded by autophagy, which causes the release of Ku80 from the Nur77-Ku80 complex, resulting in the increase of the DNA binding of Ku80 and DNA-PKcs...
April 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28430646/immunotherapeutic-target-expression-on-breast-tumors-can-be-amplified-by-hormone-receptor-antagonism-a-novel-strategy-for-enhancing-efficacy-of-targeted-immunotherapy
#4
Ritika Jaini, Matthew G Loya, Charis Eng
Immunotherapy has historically been successful in highly antigenic tumors but has shown limited therapeutic efficacy in non-antigenic tumors such as breast cancers. Our previous studies in autoimmunity have demonstrated that increased antigen load within a tissue enhances immune reactivity against it. We therefore hypothesized that enhancing expression of target proteins on breast tumors can increase efficacy of targeted immunotherapy. We hypothesized that antagonism of the estrogen receptor (ER) can increase expression of targets that are hormonally regulated and facilitate enhanced tumor recognition by targeted immunotherapy...
March 1, 2017: Oncotarget
https://www.readbyqxmd.com/read/28428557/the-prognostic-significance-of-cdc6-and-cdt1-in-breast-cancer
#5
Ravikiran Mahadevappa, Henrique Neves, Shun Ming Yuen, Yuchen Bai, Cian M McCrudden, Hiu Fung Yuen, Qing Wen, Shu Dong Zhang, Hang Fai Kwok
DNA replication is a critical step in cell proliferation. Overexpression of MCM2-7 genes correlated with poor prognosis in breast cancer patients. However, the roles of Cdc6 and Cdt1, which work with MCMs to regulate DNA replication, in breast cancers are largely unknown. In the present study, we have shown that the expression levels of Cdc6 and Cdt1 were both significantly correlated with an increasing number of MCM2-7 genes overexpression. Both Cdc6 and Cdt1, when expressed in a high level, alone or in combination, were significantly associated with poorer survival in the breast cancer patient cohort (n = 1441)...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28426931/lead-optimization-of-benzoxepin-type-selective-estrogen-receptor-er-modulators-and-downregulators-with-subtype-specific-er%C3%AE-and-er%C3%AE-activity
#6
Niamh Mary O'Boyle, Irene Barrett, Lisa M Greene, Miriam Carr, Darren Fayne, Brendan Twamley, Andrew J S Knox, Niall O Keely, Daniela M Zisterer, Mary Jane Meegan
Estrogen receptor (ER) is an important target for the design of drugs such as tamoxifen (2a) and fulvestrant (5). Three series of ER-ligands based on the benzoxepin scaffold structure were synthesised - series I containing an acrylic acid, series II with an acrylamide and series III with an acid substuent. These compounds were shown to be high affinity ligands for the ER with nanomolar IC50 binding values. Series I acrylic acid ligands were generally ERα selective. In particular, compound 13e featuring a phenylpenta-2,4-dienoic acid substituent was shown to be antiproliferative and downregulated ERα and ERβ expression in MCF-7 breast cancer cells...
April 20, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28423597/hrd1-sensitizes-breast-cancer-cells-to-tamoxifen-by-promoting-s100a8-degradation
#7
YanYang Wang, AiBin Guo, XiuBin Liang, Min Li, Ming Shi, Yan Li, Gareth Jenkins, XiaWen Lin, XueFei Wei, ZhiJun Jia, XueFeng Feng, DongMing Su, WanHua Guo
Estrogen receptor alpha positive (ER+) of breast cancer could develop resistance to antiestrogens including Tamoxifen. Our previous study showed that the E3 ubiquitin ligase HRD1 played an important role in anti-breast cancer. However, its role in chemotherapy resistance hasn't been reported. In this study, we found that HRD1 expression was downregulated in Tamoxifen-resistant breast cancer cell line MCF7/Tam compared to the Tamoxifen sensitive cell line MCF7. Moreover, S100A8 is the direct target of HRD1 by proteome analysis...
April 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28423577/the-cyclin-like-protein-spy1-regulates-the-er%C3%AE-and-erk1-2-pathways-promoting-tamoxifen-resistance
#8
Rosa-Maria Ferraiuolo, Janice Tubman, Indrajit Sinha, Caroline Hamm, Lisa Ann Porter
The Ras/Raf/MEK/ERK pathway conveys growth factor and mitogen signalling to control the phosphorylation of a plethora of substrates regulating proliferation, survival, and migration. The Ras signalling pathway is frequently associated with poor prognosis and drug resistance in various cancers including those of the blood, breast and prostate. Activation of the downstream effector ERK does not always occur via a linear cascade of events; complicating the targeting of this pathway therapeutically. This work describes a novel positive feedback loop where the cell cycle regulatory factor Spy1 (RINGO; gene SPDYA) activates ERK1/2 in a MEK-independent fashion...
April 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28423398/treatment-restarting-after-discontinuation-of-adjuvant-hormone-therapy-in-breast-cancer-patients
#9
Wei He, Karin E Smedby, Fang Fang, Henrik Olsson, Sara Margolin, Per Hall, Kamila Czene
Background: Over half of breast cancer patients discontinue their adjuvant hormone therapy, permanently or temporarily. We aimed to identify predictors of treatment restarting after discontinuation of adjuvant hormone therapy and to test the hypothesis that treatment restarting is associated with better breast cancer outcomes. Methods: We conducted a population-based cohort study by linking data from the Stockholm-Gotland Breast Cancer Register, the Swedish Prescribed Drug Register, and a self-reported questionnaire...
October 1, 2017: Journal of the National Cancer Institute
https://www.readbyqxmd.com/read/28422735/expression-of-embryonal-stem-cell-transcription-factors-in-breast-cancer-oct4-as-an-indicator-for-poor-clinical-outcome-and-tamoxifen-resistance
#10
Jae Moon Gwak, Milim Kim, Hyun Jeong Kim, Min Hye Jang, So Yeon Park
The transcription factors of embryonic stem cells, such as Oct4, Sox2, Nanog, Bmi1, and Klf4, are known to be associated with stemness, epithelial-mesenchymal transition and aggressive tumor behavior. This study was designed to evaluate the clinicopathological significance of their expression in breast cancer. Immunohistochemistry for Oct4, Sox2, Nanog, Bmi1, and Klf4 was performed in 319 cases of invasive breast cancer. The relationship between the expression of these markers and clinicopathologic features of the tumors, including breast cancer stem cell phenotype and epithelial-mesenchymal transition marker expression, and their prognostic value in breast cancer, were analyzed...
March 31, 2017: Oncotarget
https://www.readbyqxmd.com/read/28420716/a-men1-pancreatic-neuroendocrine-tumour-mouse-model-under-temporal-control
#11
Kate E Lines, Roeland P Vas Nunes, Morten Frost, Christopher J Yates, Mark Stevenson, Rajesh Thakker
Multiple endocrine neoplasia type 1 (MEN1) is an autosomal dominant disorder characterised by occurrence of parathyroid tumours, and neuroendocrine tumours (NETs) of the pancreatic islets and anterior pituitary. The MEN1 gene, encoding menin, is a tumour suppressor, but its precise role in initiating in vivo tumourigenesis remains to be elucidated. The availability of a temporally controlled conditional MEN1 mouse model would greatly facilitate the study of such early tumourigenic events, and overcome the limitations of other MEN1 knockout models, in which menin is lost from conception, or tumour development occurs asynchronously...
April 18, 2017: Endocrine Connections
https://www.readbyqxmd.com/read/28420393/medical-treatment-of-mammary-desmoid-type-fibromatosis-which-benefit
#12
Louise Scheer, Massimo Lodi, Sébastien Molière, Jean-Emmanuel Kurtz, Carole Mathelin
BACKGROUND: Breast fibromatosis is a rare disease characterized by monoclonal fibroblast proliferation. It has no ability to metastasize but has a high local recurrence rate and often infiltrates surrounding tissues. Surgical treatment is the reference, but recently, new targeted therapies have emerged. We report an original case of a patient with breast fibromatosis who received exclusive medical treatment. Our aim was to analyze these treatments based on the clinical and radiological outcome, iatrogenic effects, and pharmacological action...
April 18, 2017: World Journal of Surgical Oncology
https://www.readbyqxmd.com/read/28419445/activation-of-clc-3-chloride-channel-by-17%C3%AE-estradiol-relies-on-the-estrogen-receptor-%C3%AE-expression-in-breast-cancer
#13
Haifeng Yang, Lianshun Ma, Yawei Wang, Wanhong Zuo, Bingxue Li, Yaping Yang, Yehui Chen, Lixin Chen, Liwei Wang, Linyan Zhu
Although extensively studied, the mechanisms by which estrogen promotes breast cancer growth remain to be fully elucidated. Tamoxifen, an antiestrogen to treat ERα+ breast cancer, is also a high-affinity blocker of the chloride channels. In this study, we explored the involvement of the chloride channels in the action of estrogen in breast cancer. We found that 17β-estradiol (17β-E2) concentration-dependently activated the chloride currents in ERα+ breast cancer MCF-7 cells. Extracellular hypertonic challenge and chloride channel blockers, NPPB and DIDS inhibited the 17β-E2-activated chloride currents...
April 17, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28416841/-urothelial-carcinoma-associated-1-enhances-tamoxifen-resistance-in-breast-cancer-cells-through-competitively-inhibiting-mir-18a
#14
X N Li, A H Liu, X Tang, Y Ren
OBJECTIVE: To investigate how urothelial carcinoma-associated 1 (UCA1) and miR-18a modulates acquired tamoxifen resistance and the relevant mechanisms in estrogen receptor (ER) positive cancer cells. METHODS: qRT-PCR was performed to detect UCA1 and miR-18a expression in breast cancer cells. Dual luciferase assay was performed to detect the binding between miR-18a and UCA1 3'UTR. Tamoxifen sensitive MCF-7 cells were transfected with UCA1 expression vector or miR-18a inhibitors...
April 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28416639/absent-progesterone-receptor-expression-in-the-lymph-node-metastases-of-er-positive-her2-negative-breast-cancer-is-associated-with-relapse-on-tamoxifen
#15
Cameron E Snell, Madeline Gough, Kathryn Middleton, Michael Hsieh, Lauren Furnas, Brenton Seidl, Kristen Gibbons, Christopher Pyke, Catherine Shannon, Natasha Woodward, Jane E Armes
AIMS: Progesterone receptor (PR) expression is prognostic in early stage breast cancer. There are several reports of discordant expression between primary tumour and axillary lymph node (ALN) metastasis expression of oestrogen receptor (ER) and PR. We sought to determine whether expression of these biomarkers in the synchronous ALN metastases of ER positive (+), HER2 negative (-) breast cancer could provide more accurate prognostic information. METHODS: The retrospective cohort included 229 patients from a single institution with ER+, HER2- breast cancer who had synchronous ALN metastatic disease (2005-2014)...
April 17, 2017: Journal of Clinical Pathology
https://www.readbyqxmd.com/read/28415819/aspirin-regulation-of-c-myc-and-cyclind1-proteins-to-overcome-tamoxifen-resistance-in-estrogen-receptor-positive-breast-cancer-cells
#16
Ran Cheng, Ya-Jing Liu, Jun-Wei Cui, Man Yang, Xiao-Ling Liu, Peng Li, Zhan Wang, Li-Zhang Zhu, Si-Yi Lu, Li Zou, Xiao-Qin Wu, Yu-Xia Li, You Zhou, Zheng-Yu Fang, Wei Wei
Tamoxifen is still the most commonly used endocrine therapy drug for estrogen receptor (ER)-positive breast cancer patients and has an excellent outcome, but tamoxifen resistance remains a great impediment to successful treatment. Recent studies have prompted an anti-tumor effect of aspirin. Here, we demonstrated that aspirin not only inhibits the growth of ER-positive breast cancer cell line MCF-7, especially when combined with tamoxifen, but also has a potential function to overcome tamoxifen resistance in MCF-7/TAM...
March 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/28415634/a-meta-analysis-of-randomized-controlled-trials-comparing-the-efficacy-and-safety-of-anastrozole-versus-tamoxifen-for-breast-cancer
#17
Yan Yang, Wei Pan, Xinyu Tang, Shuqing Wu, Xinchen Sun
Whether anastrozole has superior effects to tamoxifen for breast cancer remains controversial. Therefore, we conducted this meta-analysis of randomized controlled trials (RCTs) to compare the efficacy and safety of anastrozole versus tamoxifen as adjuvant therapy in breast cancer. A systematic literature search of PubMed, Web of Science, Embase, and Cochrane library were performed to evaluate the survival benefits and toxicity profiles of patients with breast cancer who were treated with anastrozole or tamoxifen...
March 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28415616/z-ligustilide-restores-tamoxifen-sensitivity-of-era-negative-breast-cancer-cells-by-reversing-mta1-ifi16-hdacs-complex-mediated-epigenetic-repression-of-era
#18
Hui Ma, Li Li, Guojun Dou, Chengqiang Wang, Juan Li, Hui He, Mingxia Wu, Hongyi Qi
Emerging evidence indicates epigenetic modification represses estrogen receptor α (ERα) and contributes to the resistance to tamoxifen in aggressive ERα-negative (ERα-) breast cancer. Z-ligustilide is a major compound in Radix Angelica sinensis, an herb from traditional Chinese medicine (TCM) most frequently prescribed for breast cancer. However, the role of Z-ligustilide in ERα- breast cancer and epigenetic modification remains largely unknown. Herein we showed, for the first time, that Z-ligustilide restored the growth inhibition of tamoxifen on ERα- breast cancer cells...
March 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28411554/emodin-suppresses-the-nasopharyngeal-carcinoma-cells-by-targeting-the-chloride-channels
#19
Lianshun Ma, Yaping Yang, Zizhang Yin, Mei Liu, Liwei Wang, Lixin Chen, Linyan Zhu, Haifeng Yang
Emodin is a natural anthraquinone derivative isolated from the Rheum palmatum. Recent studies demonstrated that emodin has anti-cancer activity in different kinds of human cancer cell lines. However, the underlying mechanism has not been very well studied. Our previous studies showed chloride channels is an important target of anti-cancer drugs. Therefore, the purpose of this research was aimed to explore the role of chloride channels involving in the anti-cancer activity of emodin. The proliferation, cell cycle arrest and apoptosis of poorly differentiated human nasopharyngeal carcinoma cells (CNE-2Z) and normal nasopharyngeal epithelial cells (NP69-SV40T) were detected by 3-(4,5-dimethylthiazol-2-yl) -2,5-diphenyltetrazolium bromide(MTT)and flow cytometry...
April 12, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28411284/mitochondrial-power-drives-tamoxifen-resistance-nqo1-and-gclc-are-new-therapeutic-targets-in-breast-cancer
#20
Marco Fiorillo, Federica Sotgia, Diego Sisci, Anna Rita Cappello, Michael P Lisanti
Here, we identified two new molecular targets, which are functionally sufficient to metabolically confer the tamoxifen-resistance phenotype in human breast cancer cells. Briefly, ~20 proteins were first selected as potential candidates, based on unbiased proteomics analysis, using tamoxifen-resistant cell lines. Then, the cDNAs of the most promising candidates were systematically transduced into MCF-7 cells. Remarkably, NQO1 and GCLC were both functionally sufficient to autonomously confer a tamoxifen-resistant metabolic phenotype, characterized by i) increased mitochondrial biogenesis, ii) increased ATP production and iii) reduced glutathione levels...
March 2, 2017: Oncotarget
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