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https://www.readbyqxmd.com/read/29317678/peptidomimetic-blockade-of-myb-in-acute-myeloid-leukemia
#1
Kavitha Ramaswamy, Lauren Forbes, Gerard Minuesa, Tatyana Gindin, Fiona Brown, Michael G Kharas, Andrei V Krivtsov, Scott A Armstrong, Eric Still, Elisa de Stanchina, Birgit Knoechel, Richard Koche, Alex Kentsis
Aberrant gene expression is a hallmark of acute leukemias. MYB-driven transcriptional coactivation with CREB-binding protein (CBP)/P300 is required for acute lymphoblastic and myeloid leukemias, including refractory MLL-rearranged leukemias. Using structure-guided molecular design, we developed a peptidomimetic inhibitor MYBMIM that interferes with the assembly of the molecular MYB:CBP/P300 complex and rapidly accumulates in the nuclei of AML cells. Treatment of AML cells with MYBMIM led to the dissociation of the MYB:CBP/P300 complex in cells, its displacement from oncogenic enhancers enriched for MYB binding sites, and downregulation of MYB-dependent gene expression, including of MYC and BCL2 oncogenes...
January 9, 2018: Nature Communications
https://www.readbyqxmd.com/read/29298131/a-systematic-review-of-p53-regulation-of-oxidative-stress-in-skeletal-muscle
#2
Kaitlyn Beyfuss, David A Hood
BACKGROUND: p53 is a tumor suppressor protein involved in regulating a wide array of signaling pathways. The role of p53 in the cell is determined by the type of imposed oxidative stress, its intensity and duration. The last decade of research has unravelled a dual nature in the function of p53 in mediating the oxidative stress burden. However, this is dependent on the specific properties of the applied stress and thus requires further analysis. METHODS: A systematic review was performed following an electronic search of Pubmed, Google Scholar, and ScienceDirect databases...
January 3, 2018: Redox Report: Communications in Free Radical Research
https://www.readbyqxmd.com/read/29291370/fucoxanthin-and-tumor-necrosis-factor-related-apoptosis-inducing-ligand-trail-synergistically-promotes-apoptosis-of-human-cervical-cancer-cells-by-targeting-pi3k-akt-nf-%C3%AE%C2%BAb-signaling-pathway
#3
Ye Jin, Shuang Qiu, Na Shao, Jianhua Zheng
BACKGROUND Fucoxanthin is a carotenoid present in the chloroplasts of brown seaweeds. Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) is a cytokine that selectively induces apoptosis in many tumor cells and is an attractive candidate for antitumor therapies. MATERIAL AND METHODS After human cervical cancer cell lines HeLa, SiHa, and CaSki were treated with fucoxanthin or TRAIL. Cell viability was determined by 2,3-bis (2-methoxy-4-nitro-5-sulfophenyl)-2-tetrazolium 5-carboxanilide (XTT) method...
January 1, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29280516/suppression-of-stat3-nh2-terminal-domain-chemosensitizes-medulloblastoma-cells-by-activation-of-protein-inhibitor-of-activated-stat3-via-de-repression-by-microrna-21
#4
Sutapa Ray, Don W Coulter, Shawn D Gray, Jason A Sughroue, Shrabasti Roychoudhury, Erin M McIntyre, Nagendra K Chaturvedi, Kishor K Bhakat, Shantaram S Joshi, Timothy R McGuire, John G Sharp
Medulloblastoma (MB) is a malignant pediatric brain tumor with poor prognosis. Signal transducers and activators of transcription-3 (STAT3) is constitutively activated in MB where it functions as an oncoprotein, mediating cancer progression and metastasis. Here, we have delineated the functional role of activated STAT3 in MB, by using a cell permeable STAT3-NH2 terminal domain inhibitor (S3-NTDi) that specifically perturbs the structure/function of STAT3. We have implemented several biochemical experiments using human MB tumor microarray (TMA) and pediatric MB cell lines, derived from high-risk SHH-TP53-mutated and MYC-amplified Non-WNT/SHH tumors...
December 27, 2017: Molecular Carcinogenesis
https://www.readbyqxmd.com/read/29259166/inhibition-of-autophagy-delays-motoneuron-degeneration-and-extends-lifespan-in-a-mouse-model-of-spinal-muscular-atrophy
#5
Antonio Piras, Lorenzo Schiaffino, Marina Boido, Valeria Valsecchi, Michela Guglielmotto, Elena De Amicis, Julien Puyal, Ana Garcera, Elena Tamagno, Rosa M Soler, Alessandro Vercelli
Spinal muscular atrophy (SMA) is a recessive autosomal neuromuscular disease, due to homozygous mutations or deletions in the telomeric survival motoneuron gene 1 (SMN1). SMA is characterized by motor impairment, muscle atrophy, and premature death following motor neuron (MN) degeneration. Emerging evidence suggests that dysregulation of autophagy contributes to MN degeneration. We here investigated the role of autophagy in the SMNdelta7 mouse model of SMA II (intermediate form of the disease) which leads to motor impairment by postnatal day 5 (P5) and to death by P13...
December 20, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/29259008/cxcr4-promotes-neuroblastoma-growth-and-therapeutic-resistance-through-mir-15a-16-1-mediated-erk-and-bcl2-cyclin-d1-pathways
#6
Shiri Klein, Michal Abraham, Baruch Bulvik, Elia Dery, Ido D Weiss, Neta Barashi, Rinat Abramovitch, Hanna Wald, Yaniv Harel, Devorah Olam, Lola Weiss, Katia Beider, Orly Eizenberg, Ori Wald, Eithan Galun, Yaron Pereg, Amnon Peled
CXCR4 expression in neuroblastoma (NB) tumors correlates with disease severity. In this study, we describe mechanisms by which CXCR4 signaling controls NB tumor growth and response to therapy. We found that overexpression of CXCR4 or stimulation with CXCL12 supports NB tumorigenesis. Moreover, CXCR4 inhibition with the high affinity CXCR4 antagonist, BL-8040 prevented tumor growth and reduced survival of tumor cells. These effects were mediated by the upregulation of miR-15a/16-1, which resulted in downregulation of their target genes BCL-2 and cyclin D1, as well as inhibition of ERK...
December 19, 2017: Cancer Research
https://www.readbyqxmd.com/read/29250183/ampelopsin-induced-reactive-oxygen-species-enhance-the-apoptosis-of-colon-cancer-cells-by-activating-endoplasmic-reticulum-stress-mediated-ampk-mapk-xaf1-signaling
#7
Ga Bin Park, Jee-Yeong Jeong, Daejin Kim
Ampelopsin (Amp) is bioactive natural product and exerts anti-cancer effects against several cancer types. The present study investigated the anti-colon cancer activity of Amp and explored its mechanism of action. The treatment of colon cancer cells with Amp resulted in the dose- and time-dependent induction of apoptosis via the activation of endoplasmic reticulum (ER) stress, 5' adenosine monophosphate-activated protein kinase (AMPK), and c-Jun N-terminal protein kinase (JNK)/p38 mitogen-activated protein kinases (MAPKs)...
December 2017: Oncology Letters
https://www.readbyqxmd.com/read/29243757/musa-paradisiaca-inflorescence-induces-human-colon-cancer-cell-death-by-modulating-cascades-of-transcriptional-events
#8
Arun K B, Aravind Madhavan, Reshmitha T R, Sithara Thomas, P Nisha
Colorectal cancer (CRC) is one of the leading causes of cancer death, and diet plays an important role in the etiology of CRC. Traditional medical practitioners in many South Asian countries use plantain inflorescence to treat various gastro-intestinal ailments. The aim of the present study was to investigate the anticancer effects of extracts of inflorescence of Musa paradisiaca against HT29 human colon cancer cells and elucidate the mechanism of these effects by studying the modulation of cascades of transcriptional events...
December 15, 2017: Food & Function
https://www.readbyqxmd.com/read/29240787/brd3-4-inhibition-and-flt3-ligand-deprivation-target-pathways-that-are-essential-for-the-survival-of-human-mll-af9-leukemic-cells
#9
Marco Carretta, Annet Z Brouwers-Vos, Matthieu Bosman, Sarah J Horton, Joost H A Martens, Edo Vellenga, Jan Jacob Schuringa
In the present work we aimed to identify targetable signaling networks in human MLL-AF9 leukemias. We show that MLL-AF9 cells critically depend on FLT3-ligand induced pathways as well as on BRD3/4 for their survival. We evaluated the in vitro and in vivo efficacy of the BRD3/4 inhibitor I-BET151 in various human MLL-AF9 (primary) models and patient samples and analyzed the transcriptome changes following treatment. To further understand the mode of action of BRD3/4 inhibition, we performed ChIP-seq experiments on the MLL-AF9 complex in THP1 cells and compared it to RNA-seq data of I-BET151 treated cells...
2017: PloS One
https://www.readbyqxmd.com/read/29236219/radioresistant-sf9-insect-cells-readily-undergo-an-intrinsic-mode-of-apoptosis-in-response-to-histone-deacetylase-hdac-inhibition
#10
Jyoti Swaroop Kumar, Shubhankar Suman, Sudhir Chandna
Insect cell lines have been utilized as an important higher eukaryotic model system to decipher stress responses and cell death mechanisms. Lepidopteran Sf9 cells (derived from the ovaries of Spodoptera frugiperda) display nearly 100 times higher resistance to ionizing radiation in contrast to mammalian cells, which is partly contributed by an unusually high HDAC activity. However, their response to HDAC inhibition remains to be evaluated. In the present study, the effects of HDAC inhibitor (NaBt) on Sf9 cellular/nuclear morphology, cell cycle progression, DNA damage/repair, redox status, and mitochondrial perturbations were evaluated...
December 13, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/29233926/targeting-cdk6-and-bcl2-exploits-the-myb-addiction-of-ph-acute-lymphoblastic-leukemia
#11
Marco De Dominici, Patrizia Porazzi, Angela Rachele Soliera, Samanta A Mariani, Sankar Addya, Paolo Fortina, Luke F Peterson, Orietta Spinelli, Alessandro Rambaldi, Giovanni Martinelli, Anna Ferrari, Ilaria Iacobucci, Bruno Calabretta
Philadelphia Chromosome-positive acute lymphoblastic leukemia (Ph+ ALL) is currently treated with BCR-ABL1 tyrosine kinase inhibitors (TKI) in combination with chemotherapy. However, most patients develop resistance to TKI through BCR-ABL1-dependent and -independent mechanisms. Newly developed TKI can target Ph+ ALL cells with BCR-ABL1-dependent resistance; however, overcoming BCR-ABL1-independent mechanisms of resistance remains challenging because transcription factors (TF), which are difficult to inhibit, are often involved...
December 12, 2017: Cancer Research
https://www.readbyqxmd.com/read/29229477/puma-dependent-mitophagy-by-abrus-agglutinin-contributes-to-apoptosis-through-ceramide-generation
#12
Prashanta Kumar Panda, Prajna Paramita Naik, Biswa Ranjan Meher, Durgesh Nandini Das, Subhadip Mukhopadhyay, Prakash Priyadharshi Praharaj, Tapas K Maiti, Sujit K Bhutia
PUMA, a BH3-only pro-apoptotic Bcl2 family protein, is known to translocate from the cytosol into the mitochondria in order to induce apoptosis. Interestingly, the induction of PUMA by p53 plays a critical role in DNA damage-induced apoptosis. In this study, we report mitophagy inducing potential of PUMA triggered by phytolectin Abrus agglutinin (AGG) in U87MG glioblastoma cells and established AGG-induced ceramide acts as the chief mediator of mitophagy dependent cell death through activation of both mitochondrial ROS as well as ER stress...
December 8, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29218851/clinical-experience-with-the-bcl2-inhibitor-venetoclax-in-combination-therapy-for-relapsed-and-refractory-acute-myeloid-leukemia-and-related-myeloid-malignancies
#13
Courtney D DiNardo, Caitlin R Rausch, Christopher Benton, Tapan Kadia, Nitin Jain, Naveen Pemmaraju, Naval Daver, Wendy Covert, Kayleigh R Marx, Morgan Mace, Elias Jabbour, Jorge Cortes, Guillermo Garcia-Manero, Farhad Ravandi, Kapil N Bhalla, Hagop Kantarjian, Marina Konopleva
INTRODUCTION: Venetoclax (VEN), a selective BCL2 inhibitor, has single-agent activity in relapsed and refractory (R/R) acute myeloid leukemia (AML) and efficacy in lower-intensity combinations for treatment-naïve elderly AML patients. VEN treatment combinations in R/R AML have not been previously reported. METHODS: All R/R myeloid patients (including AML, myelodysplastic syndrome (MDS), and blastic plasmacytoid dendritic cell neoplasm (BPDCN)) treated with VEN combinations in the salvage setting were reviewed...
December 8, 2017: American Journal of Hematology
https://www.readbyqxmd.com/read/29215703/design-synthesis-and-characterization-of-%C3%AE-%C3%AE-unsaturated-carboxylic-acid-and-its-urea-based-derivatives-that-explores-novel-epigenetic-modulators-in-human-non-small-cell-lung-cancer-a549-cell-line
#14
Anusha Chidambaram, S H Kavya, Ramesh Kumar Chidambaram, Rajasekaran Subbiah, John Marshal Jayaraj, Karthikeyan Muthusamy, Ravikumar Vilwanathan
Histone deacetylase inhibitors (HDACi) are a small molecule chemotherapeutics that target the chromatin remodeling through the regulation of histone and non-histone proteins. These inhibitors directed against HDAC enzymes have become an important therapeutic tool in oncology; consequently, scientific efforts have fortified the quest for newer and novel HDACi, which forces the design of structurally innovative HDACi. Various urea containing compounds exhibited admirable anticancer activity. On the basis of these observations, we design and synthesize HDAC specific blocker molecules which are specifically besieged towards class I, class II and class IV HDAC isoforms to enhance the structural assortment for HDACi...
December 7, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29207508/preparation-of-a-spaceflight-apoptosis-search-in-sutured-wound-healing-models
#15
Stefan Riwaldt, Monica Monici, Asbjørn Graver Petersen, Uffe Birk Jensen, Katja Evert, Desiré Pantalone, Kirsten Utpatel, Matthias Evert, Markus Wehland, Marcus Krüger, Sascha Kopp, Sofie Frandsen, Thomas Corydon, Jayashree Sahana, Johann Bauer, Ronald Lützenberg, Manfred Infanger, Daniela Grimm
To prepare the ESA (European Space Agency) spaceflight project "Wound healing and Sutures in Unloading Conditions", we studied mechanisms of apoptosis in wound healing models based on ex vivo skin tissue cultures, kept for 10 days alive in serum-free DMEM/F12 medium supplemented with bovine serum albumin, hydrocortisone, insulin, ascorbic acid and antibiotics at 32 °C. The overall goal is to test: (i) the viability of tissue specimens; (ii) the gene expression of activators and inhibitors of apoptosis and extracellular matrix components in wound and suture models; and (iii) to design analytical protocols for future tissue specimens after post-spaceflight download...
December 3, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29207086/tan-iia-inhibits-h1299-cell-viability-through-the-mdm4%C3%A2-iap3-signaling-pathway
#16
Yukun Zu, Jianning Wang, Wei Ping, Wei Sun
Tanshinone IIA (Tan IIA), as a bioactive compound extracted from the dried roots of Salvia miltiorrhiza (also known as Danshen), is known to inhibit cancer cell proliferation and induce apoptosis. However, the mechanisms underlying the function of Tan IIA in cancer cell apoptosis remain to be elucidated The aim of the present study was to identify the molecular mechanisms underlying the anti‑cancer effects of Tan IIA in p53‑deficient H1299 cells. Tan IIA was demonstrated to suppress murine double minute 4 (MDM4) expression in a time‑ and dose‑dependent manner through the inhibition of MDM4 mRNA synthesis...
November 24, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29198442/biology-informs-treatment-choices-in-diffuse-large-b-cell-lymphoma
#17
REVIEW
Matthew J Butler, Ricardo C T Aguiar
The effective deployment of rationally developed therapies for diffuse large B cell lymphoma (DLBCL) requires rapid assimilation of new biological data. Within this framework, here we address topical issues at the intersection of DLBCL biology and the clinic. We discuss targeting of B cell receptor (BCR) signaling, with emphasis on identifying patients who may benefit from this maneuver and how to best achieve it. We address strategies to modulate the DLBCL microenvironment, including the use of immune checkpoint inhibitors in selected DLBCL subsets, and the potential activity of alternative antiangiogenic therapies...
December 2017: Trends in Cancer
https://www.readbyqxmd.com/read/29169418/-mechanism-underlying-inhibition-of-proliferation-and-promotion-of-apoptosis-by-lapatinib-in-hl60-cells
#18
Lu Liu, Beizhong Liu, Yi Zhao, Min Chen, Shifei Yao, Lianwen Li, Chunlan Xiao, Zhiling Shan, Ting Xu, Liugen Gan, Liang Zhong
Objective To investigate the effect of lapatinib on cell proliferation and apoptosis in acute myeloid leukemia HL60 cells in vitro and the related molecular mechanisms. Methods The HL60 cells were treated with 5, 10, 15 μmol/L lapatinib for 24 hours, and then morphological changes of the cells were observed under optical microscope. CCK-8 assay was used to assess the cell viability. Colony formation assay was performed to detect the cell proliferation ability. Cell apoptosis labeled by annexinV-FITC/PI were analyzed by flow cytometry...
October 2017: Xi Bao Yu Fen Zi Mian Yi Xue za Zhi, Chinese Journal of Cellular and Molecular Immunology
https://www.readbyqxmd.com/read/29169415/-over-expression-of-thioredoxin-interacting-protein-promotes-apoptosis-of-min6-cells-via-activating-p38mapk-pathway
#19
Wenzhen Deng, Yang Li, Yanjun Jia, Liang Tang, Qirui He, Dongfang Liu
Objective To investigate the effect of thioredoxin interacting protein (TXNIP) over-expression on the apoptosis of MIN6 β-cells and the mechanism involved. Methods Lentivirus carrying TXNIP gene was used to infect MIN6 β-cells in logarithmic growth phase, and the infection efficiency was evaluated by fluorescence microscope and Western blotting. Then MIN6 β-cells were divided into three groups: control group, empty lentivirus vector (LV-GFP) group and TXNIP over-expression (LV-GFP-TXNIP) group. CCK-8 assay was used to detect cell proliferation...
October 2017: Xi Bao Yu Fen Zi Mian Yi Xue za Zhi, Chinese Journal of Cellular and Molecular Immunology
https://www.readbyqxmd.com/read/29169414/-over-expressed-bax-inhibitor-1-bi-1-inhibits-apoptosis-of-hippocampal-neurons-via-endoplasmic-reticulum-ire1-jnk-pathway-in-rats-with-subarachnoid-hemorrhage
#20
Jiaxin Liu, Shuai Zhou, Xiying Qian, Yueting Zhang, Jianhua Zhao
Objective To investigate the protective effect of lentivirus-mediated BI-1 overexpression on hippocampal neurons in rats with subarachnoid hemorrhage (SAH) and the relationship with endoplasmic reticulum IRE1-JNK signaling pathway. Methods The lentivirus solution of BI-1 over-expression was injected into the brain of rats 24 hours before SAH rat model was established by intravascular puncture method. At 24 hours after modeling, the brain water content and neurological score of the rats were measured. The apoptosis of hippocampal neurons was detected by TUNEL assay...
October 2017: Xi Bao Yu Fen Zi Mian Yi Xue za Zhi, Chinese Journal of Cellular and Molecular Immunology
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