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Drug: Tamoxifen

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Total 112 results found since Jan 2013.

Abstract 3943: siRNA-mediated HuR silencing sensitizes triple-negative breast cancer cells to radiation therapy
HuR is a ubiquitously expressed member of the Elav/Hu family of RNA-binding proteins which can associate with mRNAs containing AU-rich elements in their 3′-untranslated regions. It is predominantly a nuclear protein that translocates to the cytoplasm in response to stress signals and stabilizes mRNAs encoding proteins implicated in cell proliferation, angiogenesis, apoptosis, and stress response. Studies examining HuR expression in human cancers indicated that elevated cytoplasmic HuR expression is associated with a high histologic grade, large tumor size, and poor survival of patients with cancer, leading to the hypothe...
Source: Cancer Research - September 30, 2014 Category: Cancer & Oncology Authors: Basalingappa, K. M., Mehta, M., Griffith, J. N., Muralidharan, R., Gorospe, M., Ramesh, R., Munshi, A. Tags: Tumor Biology Source Type: research

Resveratrol Promotes Diabetic Wound Healing via SIRT1-FOXO1-c-Myc Signaling Pathway-Mediated Angiogenesis
Conclusion: Our findings indicate that the positive role of RES in diabetic wound healing via its SIRT1-dependent endothelial protection and pro-angiogenic effects involves the inhibition of FOXO1 and the de-repression of c-Myc expression. Introduction Diabetes mellitus is a metabolic disease with an increasing incidence worldwide (Zimmet et al., 2014). The disease often leads to the development of serious complications such as microangiopathy, mainly including retinopathy, nephropathy, neuropathy, and diabetic non-healing skin ulcers (Zheng et al., 2018). Diabetic non-healing skin ulcers such as foot ulcers are ca...
Source: Frontiers in Pharmacology - April 23, 2019 Category: Drugs & Pharmacology Source Type: research

Acid-degradable core-shell nanoparticles for reversed tamoxifen-resistance in breast cancer by silencing manganese superoxide dismutase (MnSOD).
This study attempted to reverse tamoxifen (TAM)-resistance in breast cancer by silencing a mitochondrial enzyme, manganese superoxide dismutase (MnSOD), which dismutates TAM-induced reactive oxygen species (ROS) (i.e., superoxide) to less harmful hydrogen peroxide and hampers therapeutic effects. Breast cancer cells were co-treated with TAM and MnSOD siRNA-delivering nanoparticles (NPs) made of a siRNA/poly(amidoamine) (PAMAM) dendriplex core and an acid-degradable polyketal (PK) shell. The (siRNA/PAMAM)-PK NPs were designed for the PK shell to shield siRNA from nucleases, minimize detrimental aggregation in serum, and fac...
Source: Biomaterials - September 19, 2013 Category: Materials Science Authors: Cho SK, Pedram A, Levin ER, Kwon YJ Tags: Biomaterials Source Type: research

Complement C5b-9 and Cancer: Mechanisms of Cell Damage, Cancer Counteractions, and Approaches for Intervention
In conclusion, osmotic burst of inflated complement-damaged cells may occur, but these bursts are most likely a consequence of metabolic collapse of the cell rather than the cause of cell death. The Complement Cell Death Mediator: A Concerted Action of Toxic Moieties Membrane pores caused by complement were first visualized by electron microscopy on red blood cell membranes as large ring structures (22). Similar lesions were viewed on E. coli cell walls (23). Over the years, ample information on the fine ultrastructure of the MAC that can activate cell death has been gathered (24) and has been recently further examined (...
Source: Frontiers in Immunology - April 9, 2019 Category: Allergy & Immunology Source Type: research

Effects of long noncoding RNA-ROR on tamoxifen resistance of breast cancer cells by regulating microRNA-205
ConclusionIn MDA-MB-231 cells, down-regulated lncRNA-ROR could inhibit the EMT of breast cancer cells and enhance the sensibility of breast cancer cells to tamoxifen by increasing miR-205 expression and suppressing the expressions of ZEB1 and ZEB2.
Source: Cancer Chemotherapy and Pharmacology - January 5, 2017 Category: Cancer & Oncology Source Type: research

17β-estradiol induces stearoyl-CoA desaturase-1 expression in estrogen receptor-positive breast cancer cells
Conclusions: This study illustrates for the first time that, in contrast to hepatic and adipose tissue, estrogen induces SCD-1 expression and activity in breast carcinoma cells. These results support SCD-1 as a therapeutic target in estrogen-sensitive breast cancer.
Source: BMC Cancer - May 29, 2015 Category: Cancer & Oncology Authors: Anissa BelkaidSabrina DuguayRodney OuelletteMarc Surette Source Type: research

Estrogenic compound attenuates angiotensin II-induced vascular smooth muscle cell proliferation through interaction between LKB1 and estrogen receptor α
Publication date: Available online 9 September 2016 Source:Journal of Pharmacological Sciences Author(s): Sun Ae Kim, Kyung Young Lee, Jae-Ryong Kim, Hyoung Chul Choi The prevalence rate of cardiovascular disease is higher for males than females, and estradiol (E2) induces AMP-activated protein kinase (AMPK) activation, which is known to regulate proliferation of VSMC. We identified the estrogenic properties of nordihydrogaiaretic acid (NDGA, a lignan phytoestrogen) that inhibit VSMC proliferation and explored the underlying mechanisms. Both the phosphorylation and expression of LKB1 were increased by NDGA. In addition, N...
Source: Journal of Pharmacological Sciences - September 8, 2016 Category: Drugs & Pharmacology Source Type: research

Expression of the CD59 Glycoprotein Precursor is Upregulated in an Estrogen Receptor-alpha (ER- α)-Negative and a Tamoxifen-Resistant Breast Cancer Cell Line In Vitro.
CONCLUSIONS In summary, our results proposed a candidate biomarker for predicting TAM resistance in ERa-positive breast cancer via targeting CD59, therefore it could be a novel therapeutic option. PMID: 30391994 [PubMed - in process]
Source: Medical Science Monitor - November 7, 2018 Category: Research Tags: Med Sci Monit Source Type: research

MST2 silencing induces apoptosis and inhibits tumor growth for estrogen receptor alpha-positive MCF-7 breast cancer.
Abstract Mammalian sterile 20-like kinase 1/2 (MST1/2) plays an important role in cell growth and apoptosis and functions as a tumor suppressor. Previously, we showed that MST2 overexpression activates Estrogen receptor alpha (ERα) in human breast cancer MCF-7 cells in the absence of a ligand. Here, we examined the role of MST2 in the growth of ER-positive MCF-7 cells. Cell cycle, apoptosis, and mammosphere formation assay method were implemented to detect the biological effects of MST2 ablation on the growth of MCF-7 cells in vitro. The effect of MST2-siRNA on MCF-7 cells tumor growth in vivo was studied in tumo...
Source: Toxicology and Applied Pharmacology - September 28, 2020 Category: Toxicology Authors: Park J, Kim GH, Lee J, Phuong BTC, Kong B, Won JE, Won GW, Lee YH, Han HD, Lee Y Tags: Toxicol Appl Pharmacol Source Type: research

Knockdown of YAP/TAZ sensitizes tamoxifen-resistant MCF7 breast cancer cells
In conclusion, targeting the YAP/TAZ-PSAT1 axis could sensitize tamoxifen-resistant MCF7 breast cancer cells by modulating the mTORC1-survivin axis.PMID:35231654 | DOI:10.1016/j.bbrc.2022.02.083
Source: Cell Research - March 1, 2022 Category: Cytology Authors: Yu Jin Kim Se-Kyeong Jang Sung-Eun Hong Chan Sub Park Min-Ki Seong Hyun-Ah Kim Ki Soo Park Chun-Ho Kim In-Chul Park Hyeon-Ok Jin Source Type: research

Inhibition of vacuolar H+ ATPase enhances sensitivity to tamoxifen via up-regulation of CHOP in breast cancer cells.
Abstract Resistance of estrogen receptor-positive breast cancer cells to tamoxifen represents a major barrier to the successful treatment of breast cancer. In the present study, we found that vacuolar H+ ATPase (vATPase) inhibitors, bafilomycin A1 and concanamycin A, sensitize tamoxifen-induced cell death. siRNA targeting ATP6V0C, a 16-kDa hydrophobic proteolipid subunit of vATPase that plays a central role in H+ transport, markedly increased cell death induced by tamoxifen. Interestingly, bafilomycin A1 induced up-regulation of DR4/DR5 and CHOP. Knock-down of CHOP by siRNA suppressed the cell death induced by baf...
Source: Biochemical and Biophysical Research communications - July 6, 2013 Category: Biochemistry Authors: Jin HO, Lee YH, Kim HA, Kim EK, Noh WC, Kim YS, Hwang CS, Kim JI, Chang YH, Hong SI, Hong YJ, Park IC, Lee JK Tags: Biochem Biophys Res Commun Source Type: research

Abstract B50: MEK inhibitors mount a two-pronged attack to kill estrogen receptor positive (ER+) breast cancer cells undergoing hormonal therapy: Attenuated autophagy and induction of apoptosis
In this study, we hypothesized that the requirement of MEK1/MAPK1/2 for pro-survival autophagy is due, in part, to its role in blocking the intracellular accumulation of dephosphorylated BimEL. To test this hypothesis, we modulated the expression of dephosphorylated BimEL with either a BimEL cDNA expression vector, siRNA targeting of BimEL, or MEK1 blockade with the small molecule inhibitor U0126 and determined the levels of the autophagic flux in ER+ breast cancer cells undergoing antiestrogen treatment. The determination of autophagic flux was made by comparing the levels of two proteins involved in autophagy -the LC3 /A...
Source: Molecular Cancer Research - February 5, 2015 Category: Cancer & Oncology Authors: Takhar, S., Manning, M., Eason, A., Dix, M., Periyasamy-Thandavan, S., Padi, R., Bieberich, E., Hill, W., Browning, D., Ganapathy, V., Thangaraju, M., Schoenlein, P. V. Tags: RAS Targeting: Poster Presentations - Proffered Abstracts Source Type: research

Over-expression of miR-451a can enhance the sensitivity of breast cancer cells to tamoxifen by regulating 14-3-3ζ, estrogen receptor α, and autophagy
Publication date: Available online 17 February 2016 Source:Life Sciences Author(s): Zhen-Ru Liu, Yi Song, Li-Hong Wan, Yuan-Yuan Zhang, Li-Mimg Zhou Aim To investigate the effects and mechanisms of miR-451a in the tamoxifen (TAM) resistance of breast cancer cells. Materials and methods TAM sensitive cells (MCF-7) and resistant cells (LCC2) were employed in the study. The lentivirus vectors of Lv-miR-451a, Lv-miR-451a sponge, and Lv-miR-451a NC were employed to increase or decrease the expression of miR-451a, respectively. SiRNA to 14-3-3ζ was used to inhibit expression of 14-3-3ζ. MTT assay was utilized to detect...
Source: Life Sciences - February 18, 2016 Category: Biology Source Type: research