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https://www.readbyqxmd.com/read/28238848/resveratrol-protects-against-spinal-cord-injury-by-activating-autophagy-and-inhibiting-apoptosis-mediated-by-the-sirt1-ampk-signaling-pathway
#1
Haosen Zhao, Shurui Chen, Kai Gao, Zipeng Zhou, Chen Wang, Zhaoliang Shen, Yue Guo, Zhuo Li, Zhanghui Wan, Chang Liu, Xifan Mei
Spinal cord injury (SCI) is a devastating condition with few effective treatments. Resveratrol, a polyphenolic compound, has exhibited neuroprotective effects in many neurodegenerative diseases. However, the explicit effect and mechanism of resveratrol on SCI is still unclear. Adenosine 5' monophosphate-activated protein kinase (AMPK) and Sirtuin 1 (SIRT1),the downstream protein, play key roles in metabolizing of energy, resisting of resistance, and cellularprotein homeostasis. In this study, we determined the effects of resveratrol on SCI and their potential relationship with SIRT1/AMPK signaling pathway, autophagy and apoptosis...
February 23, 2017: Neuroscience
https://www.readbyqxmd.com/read/28237821/relief-of-oxidative-stress-and-cardiomyocyte-apoptosis-by-using-curcumin-nanoparticles
#2
Jing Li, Yu Zhou, Wei Zhang, Cuiyu Bao, Zhigang Xie
In this work, the influence of curcumin nanoparticles (CUR-NPs) on NADPH oxidase-related reactive oxygen species (ROS) production and cardiac apoptosis, together with the modulation of protein signaling pathways, were investigated in detail by using cardiomyocytes. The exposure of cardiomyocytes to palmitate (PA) led to an increase in both cell apoptosis and intracellular ROS levels, which were strongly inhibited by CUR-NPs. CUR-NPs treatment remarkably suppressed the increased activity of Rac1, as well as the enhanced expression of p22(phox), p47(phox), p67(phox) and gp91(phox) induced by PA...
February 21, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28235426/antiproliferative-activity-and-apoptosis-induction-by-3-4-dibenzyloxyflavonol-on-human-leukemia-cells
#3
Mercedes Said, Ignacio Brouard, José Quintana, Francisco Estévez
In this study, we investigated the effects of synthetic 3',4'-dibenzyloxyflavonol on viabilities of eight human tumor cells. It was cytotoxic against leukemia cells (HL-60, U-937, MOLT-3, K-562, NALM-6, Raji), with significant effects against P-glycoprotein-overexpressing K-562/ADR and Bcl-2-overexpressing U-937/Bcl-2 cells, but had no significant cytotoxic effects against quiescent or proliferating human peripheral blood mononuclear cells. The IC50 value for the leukemia HL-60 cells was 0.8 ± 0.1 μM...
February 21, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28229391/kudsuphilactone-b-a-nortriterpenoid-isolated-from-schisandra-chinensis-fruit-induces-caspase-dependent-apoptosis-in-human-ovarian-cancer-a2780-cells
#4
Miran Jeong, Hye Mi Kim, Hyun Ji Kim, Jung-Hye Choi, Dae Sik Jang
A phytochemical study on the fruits of Schisandra chinensis led to the isolation and characterization of nineteen compounds. The structures of the isolates were determined to be schizandrin, deoxyschizandrin, angeloylgomisin H, gomisin A, gomisin J, (-)-gomisin L1, (-)-gomisin L2, wuweizisu C, gomisin N, meso-dihydroguaiaretic acid, kadsuphilactone B, α-ylangenol, α-ylangenyl acetate, β-chamigrenal, β-chamigrenic acid, 4-hydroxybenzoic acid, protocatechuic acid, p-methylcarvacrol, and indole-3-acetic acid...
February 22, 2017: Archives of Pharmacal Research
https://www.readbyqxmd.com/read/28222438/microrna-29b-inhibits-angiogenesis-by-targeting-vegfa-through-the-mapk-erk-and-pi3k-akt-signaling-pathways-in-endometrial-carcinoma
#5
Hong-Xia Chen, Xiao-Xia Xu, Bu-Zhen Tan, Zhi Zhang, Xiao-Dong Zhou
OBJECTIVE: The purpose of this study is to explore the effects of microRNA-29b (miR-29b) regulating MAPK/ERK and PI3K/Akt signaling pathways on angiogenesis in endometrial carcinoma (EC) by targeting VEGFA. METHODS: Between February 2013 and April 2015, 126 EC patients admitted to the Second Affiliated Hospital of Nanchang University were randomly selected, with 126 EC tissues and the corresponding adjacent normal tissues collected after surgery. The human EC cell lines RL-95-2 and HEC-1-B and human endometrial cells were assigned to the normal group (human endometrial cells), the blank group (untransfected RL-95-2 or HEC-1-B cells), the pMIR-control group (RL-95-2 or HEC-1-B cells transfected with an empty vector), the pMIR-miR-29b group (RL-95-2 or HEC-1-B cells transfected with the miR-29b plasmid), LNA-control group (RL-95-2 or HEC-1-B cells transfected with an oligonucleotide inhibitors control), the LNA-miR-29b inhibitors group (RL-95-2 or HEC-1-B cells transfected with miRCURY LNATM miR-29b inhibitors), the LNA-miR-29b inhibitors + PD98059 group (RL-95-2 or HEC-1-B cells transfected with miRCURY LNATM miR-29b inhibitors and PD98059, an inhibitor of the MAPK/ERK signaling pathway) and the LNA-miR-29b inhibitors + wortmannin group (RL-95-2 or HEC-1-B cells transfected with miRCURY LNATM miR-29b inhibitors and wortmannin, an inhibitor of the PI3K/Akt signaling pathway)...
February 20, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28222148/microrna-200a-silencing-protects-neural-stem-cells-against-cerebral-ischemia-reperfusion-injury
#6
Ji Ma, Shaofeng Shui, Xinwei Han, Dong Guo, Tengfei Li, Lei Yan
Neural stem cells (NSCs) play major roles in neurological recovery after cerebral infarction (CI). This study was trying to investigate whether miR-200a, a vital regulator in cell proliferation, migration and apoptosis, also has a role in oxygen-glucose deprivation/reperfusion (OGD/R) injured NSCs. In this study, primary NSCs were subjected to OGD/R conditions to mimic an in vitro CI model. Before OGD/R induction, NSCs were transfected with vector or shRNA against miR-200a to overexpress or suppress miR-200a expression...
2017: PloS One
https://www.readbyqxmd.com/read/28219227/-targeting-mir155-restores-chemotherapy-sensitivity-in-drug-resistant-myeloma-cell-line-rpmi8226-dox-cells
#7
C R Xiao, X L Hong, J S Hu, Y M Chen, Q Y Lu
Objective: To explore the mechanism of abnormal expression of microRNA155 (miR155) in myeloma drug-resistance to probe the possibility of inhibiting miR155 expression to restore chemotherapy sensitivity and its molecular mechanism in drug-resistant myeloma cells. Methods: Drug-resistant myeloma cell-line RPMI8226/DOX was established by culturing RPMI8226 cells with continuous low concentration and intermittent gradually increasing concentration of doxorubicin in vitro; The levels of miR155 mRNA were measured by qRT-PCR, and both proteins FOXO3a and BCL-2 expressions were detected by Western blot in cell-lines RPMI8226/S and RPMI8226/Dox...
January 14, 2017: Zhonghua Xue Ye Xue za Zhi, Zhonghua Xueyexue Zazhi
https://www.readbyqxmd.com/read/28218611/auranofin-an-inhibitor-of-thioredoxin-reductase-induces-apoptosis-in-hepatocellular-carcinoma-hep3b-cells-by-generation-of-reactive-oxygen-species
#8
Hyun Hwang-Bo, Jin-Woo Jeong, Min Ho Han, Cheol Park, Su-Hyun Hong, Gi-Young Kim, Sung-Kwon Moon, Jaehun Cheong, Wun-Jae Kim, Young Hyun Yoo, Yung Hyun Choi
Mammalian thioredoxin reductase (TrxR) plays a vital role in restoring cellular redox balance disrupted by reactive oxygen species (ROS) generation and oxidative damage. Here, we evaluated whether auranofin, a selective inhibitor of TrxR, could serve as a potential anti-cancer agent through its selective targeting of TrxR activity in Hep3B hepatocellular carcinoma cells. Auranofin treatment reduced the TrxR activity of these cells and induced apoptosis, which were accompanied by up-regulation of death receptors (DRs) and activation of caspases, as well as promotion of proteolytic degradation of poly(ADP-ribose)-polymerase...
February 20, 2017: General Physiology and Biophysics
https://www.readbyqxmd.com/read/28214890/a-new-perspective-for-osteosarcoma-therapy-proteasome-inhibition-by-mln9708-2238-successfully-induces-apoptosis-and-cell-cycle-arrest-and-attenuates-the-invasion-ability-of-osteosarcoma-cells-in-vitro
#9
Renhao Liu, Chunjiang Fu, Jiabing Sun, Xvming Wang, Shuo Geng, Xiaoyu Wang, Jilong Zou, Zhenggang Bi, Chenglin Yang
BACKGROUND: The proteasome exists in all eukaryotic cells and provides the main route of intracellular proteins degradation involved in cell growth and apoptosis. Proteasome inhibition could block protein degradation pathways and disturb regulatory networks, possibly leading to profound effects on cell growth, particularly in cancer cells. A proteasome inhibitor with an appropriate toxicity index for malignant cells rather than normal cells would be an attractive anticancer therapy. METHODS: The human osteosarcoma (OS) cell lines MG-63 and Saos-2 and normal osteoblast cells were used to study the antitumour activity of the proteasome inhibitor MLN9708/2238...
January 27, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28211035/resveratrol-decreases-foxo-protein-expression-through-pi3k-akt-dependent-pathway-inhibition-in-h2o2-treated-synoviocytes
#10
Bin Xu, Gaoyuan Wang, Junqiang Zhang, Wei Cao, Xiaoyu Chen
The aim of this study was to investigate the effects of resveratrol (Res) on hydrogen peroxide (H2O2)-treated fibroblast-like synoviocytes (FLSs) in vitro. We studied the phosphoinositide 3-kinase (PI3K)-Akt pathway inhibition-mediated effects of Res on forkhead box O (FoXO) mRNA expression levels. FLS viability was determined by Cell Counting Kit-8 (CCK-8) assay, and FLS apoptosis was measured by terminal deoxyribo nucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL) staining and flow cytometry...
February 17, 2017: Histology and Histopathology
https://www.readbyqxmd.com/read/28209992/from-basic-apoptosis-discoveries-to-advanced-selective-bcl-2-family-inhibitors
#11
REVIEW
Avi Ashkenazi, Wayne J Fairbrother, Joel D Leverson, Andrew J Souers
Members of the B cell lymphoma 2 (BCL-2) gene family have a central role in regulating programmed cell death by controlling pro-apoptotic and anti-apoptotic intracellular signals. In cancer, apoptosis evasion through dysregulation of specific BCL-2 family genes is a recurring event; accordingly, selective inhibition of specific anti-apoptotic BCL-2 family proteins represents an exciting therapeutic opportunity. A combination of nuclear magnetic resonance (NMR)-based screening and structure-based drug design has yielded the first bona fide BCL-2 homology 3 (BH3) mimetics, including the BCL-2 and BCL-XL dual antagonist navitoclax, which is the first BCL-2 family inhibitor to show efficacy in patients with cancer...
February 17, 2017: Nature Reviews. Drug Discovery
https://www.readbyqxmd.com/read/28202514/mcl-1-degradation-is-required-for-targeted-therapeutics-to-eradicate-colon-cancer-cells
#12
Jingshan Tong, Peng Wang, Shuai Tan, Dongshi Chen, Zaneta Nikolovska-Coleska, Fangdong Zou, Jian Yu, Lin Zhang
The Bcl-2 family protein Mcl-1 is often degraded in cancer cells subjected to effective therapeutic treatment, and defective Mcl-1 degradation has been associated with intrinsic and acquired drug resistance. However, a causal relationship between Mcl-1 degradation and anticancer drug responses has not been directly established, especially in solid tumor cells where Mcl-1 inhibition alone is insufficient to trigger cell death. In this study, we present evidence that Mcl-1 participates directly in determining effective therapeutic responses in colon cancer cells...
February 15, 2017: Cancer Research
https://www.readbyqxmd.com/read/28202255/alleviation-of-ischaemia-reperfusion-injury-by-endogenous-estrogen-involves-maintaining-bcl-2-expression-via-the-er%C3%AE-signalling-pathway
#13
Zeng-Li Zhang, Pei Qin, Yuhong Liu, Li-Xia Zhang, Hang Guo, You-Liang Deng, Yizhao-Liu, Yu-Shu Hou, Li-Yang Wang, Yi Miao, Yu-Long Ma, Wu-Gang Hou
The neuroprotective effects of estrogen against cerebral ischaemia have been confirmed by multiple basic and clinical studies. However, most of these studies used exogenous estrogen administered via different injection methods, and the neuroprotective effects of endogenous estrogen produced by ovaries during different phases of estrous cycle and the underlying mechanisms involved have rarely been explored. In this study, we first identified the stage of estrous cycle via vaginal smears and then measured serum estradiol levels at each phase via radioimmunoassay...
February 12, 2017: Brain Research
https://www.readbyqxmd.com/read/28197857/diallyl-disulfide-suppresses-the-inflammation-and-apoptosis-resistance-induced-by-dca-through-ros-and-the-nf-%C3%AE%C2%BAb-signaling-pathway-in-human-barrett-s-epithelial-cells
#14
Cheng Feng, Yumei Luo, Yuanyuan Nian, Dong Liu, Xiaoran Yin, Jing Wu, Jia Di, Rong Zhang, Jun Zhang
Barrett's esophagus (BE) is generally accepted as the only precursor to esophageal adenocarcinoma (EAC). Deoxycholic acid (DCA)-induced inflammation and apoptotic resistance play an important role in the carcinogenesis and progression from BE to EAC. Diallyl disulfide (DADS) is a garlic-derived natural organosulfur compound. This study investigated whether DADS has chemopreventive effects against BE and the potentially related signaling pathway. BAR-T cells were treated with DCA in the presence or absence of DADS...
February 14, 2017: Inflammation
https://www.readbyqxmd.com/read/28197319/structure-based-design-of-non-natural-peptidic-macrocyclic-mcl-1-inhibitors
#15
Jeffrey W Johannes, Stephanie Bates, Carl Beigie, Matthew A Belmonte, John Breen, Shenggen Cao, Paolo A Centrella, Matthew A Clark, John W Cuozzo, Christoph E Dumelin, Andrew D Ferguson, Sevan Habeshian, David Hargreaves, Camil Joubran, Steven Kazmirski, Anthony D Keefe, Michelle L Lamb, Haiye Lan, Yunxia Li, Hao Ma, Scott Mlynarski, Martin J Packer, Philip B Rawlins, Daniel W Robbins, Haidong Shen, Eric A Sigel, Holly H Soutter, Nancy Su, Dawn M Troast, Haiyun Wang, Kate F Wickson, Chengyan Wu, Ying Zhang, Qiuying Zhao, Xiaolan Zheng, Alexander W Hird
Mcl-1 is a pro-apoptotic BH3 protein family member similar to Bcl-2 and Bcl-xL. Overexpression of Mcl-1 is often seen in various tumors and allows cancer cells to evade apoptosis. Here we report the discovery and optimization of a series of non-natural peptide Mcl-1 inhibitors. Screening of DNA-encoded libraries resulted in hit compound 1, a 1.5 μM Mcl-1 inhibitor. A subsequent crystal structure demonstrated that compound 1 bound to Mcl-1 in a β-turn conformation, such that the two ends of the peptide were close together...
February 9, 2017: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28196134/alterations-in-estrogen-signalling-pathways-upon-acquisition-of-anthracycline-resistance-in-breast-tumor-cells
#16
Simon Chewchuk, Baoqing Guo, Amadeo Mark Parissenti
Intrinsic or acquired drug resistance is a major impediment to the successful treatment of women with breast cancer using chemotherapy. We have observed that MCF-7 breast tumor cells selected for resistance to doxorubicin or epirubicin (MCF-7DOX2 and MCF-7EPI cells, respectively) exhibited increased expression of several members of the aldo-keto reductase (AKR) gene family (in particular AKR1C3 and AKR1B10) relative to control MCF-7CC cells selected by propagation in the absence of drug. Normal cellular roles for the AKRs include the promotion of estrogen (E2) synthesis from estrone (E1) and the hydroxylation and detoxification of exogenous xenobiotics such as anthracycline chemotherapy drugs...
2017: PloS One
https://www.readbyqxmd.com/read/28196062/elemene-induces-apoptosis-of-human-gastric-cancer-cell-line-bgc-823-via-extracellular-signal-regulated-kinase-erk-1-2-signaling-pathway
#17
Pihong Li, Xiang Zhou, Weijian Sun, Weiwei Sheng, Yangyang Tu, Yaojun Yu, Jianda Dong, Bing Ye, Zhiqiang Zheng, Mingdong Lu
BACKGROUND Elemene is extracted from a traditional herbal medicine and is commonly used in the treatment of cancer in China. However, its effect on gastric cancer cells remains unknown. The goal of this study was to investigate its effect on human gastric cancer cells. MATERIAL AND METHODS Human gastric cancer BGC-823 cells and a tumor-bearing mouse model were employed to be divided into 4 groups: control group, elemene group, PD98059 group (an ERK 1/2 signaling pathway inhibitor), and the combined group (elemene plus PD98059)...
February 14, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28192254/effect-of-dietary-phosphorus-deficiency-on-the-growth-immune-function-and-structural-integrity-of-head-kidney-spleen-and-skin-in-young-grass-carp-ctenopharyngodon-idella
#18
Kang Chen, Wei-Dan Jiang, Pei Wu, Yang Liu, Sheng-Yao Kuang, Ling Tang, Wu-Neng Tang, Yong-An Zhang, Xiao-Qiu Zhou, Lin Feng
This study evaluates the effects of dietary phosphorus on the growth, immune function and structural integrity (head kidney, spleen and skin) of young grass carp (Ctenopharyngodon idella) that were fed graded levels of available phosphorus (0.95-8.75 g/kg diet). Results indicated that phosphorus deficiency decreased the growth performance of young grass carp. In addition, the results first demonstrated that compared with the optimal phosphorus level, phosphorus deficiency depressed the lysozyme (LZ) and acid phosphatase (ACP) activities and the complement 3 (C3), C4 and immunoglobulin M (IgM) contents, and down-regulated the mRNA levels of antimicrobial peptides, anti-inflammatory cytokines, inhibitor of κBα (IκBα) and target of rapamycin (TOR), whereas it up-regulated pro-inflammatory cytokines, nuclear factor kappa B (NF-κB) p65 and NF-κB p52 mRNA levels to decrease fish head kidney and spleen immune functions...
February 10, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28191864/overexpression-of-nad-p-h-quinone-oxidoreductase-1-inhibits-hepatocellular-carcinoma-cell-proliferation-and-induced-apoptosis-by-activating-ampk-pgc-1%C3%AE-pathway
#19
Xin Zhang, Kun Han, Dong-Hong Yuan, Cun-Ying Meng
Hepatocellular carcinoma (HCC) is the most common lethal malignancy and a leading cause of malignancy-associated death in many countries, but mainly in Asia. Expression of the NAD(P)H:quinone oxidoreductase 1 (NQO1) protein is involved in the growth of various human cancers, including HCC. NQO1 is considered an inhibitor of cancers. The present study aimed to investigate the function and mechanism of NQO1 in HCC. In this study, we found that NQO1 overexpression decreased HCC cell SK-hep-1 and Hep3B cell proliferation and induced apoptosis...
February 13, 2017: DNA and Cell Biology
https://www.readbyqxmd.com/read/28190476/neuroprotective-properties-of-icariin-in-mptp-induced-mouse-model-of-parkinson-s-disease-involvement-of-pi3k-akt-and-mek-erk-signaling-pathways
#20
Wen-Fang Chen, Lin Wu, Zhong-Rui Du, Lei Chen, Ai-Li Xu, Xiao-Han Chen, Ji-Jun Teng, Man-Sau Wong
BACKGROUND: Epimedium sagittatum is a traditional Chinese herb normally which is used to treat the osteoporosis, cardiovascular dysfunction, and to improve neurological and sexual function in China, Korea and Japan. Icariin is the major active ingredient in Epimedium sagittatum. In the present research, we examined the neuroprotective effects of icariin on dopaminergic neurons and the possible mechanisms in a mouse model of Parkinson's disease (PD). METHODS: Ovariectomized PD mice were treated with vehicle or icariin (3 days before MPTP injections) with or without the phosphatidylinositol 3-kinase (PI3K) inhibitor LY294002 or mitogen-activated protein kinase kinase (MEK) inhibitor PD98059...
February 15, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
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