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https://www.readbyqxmd.com/read/29290768/modulated-electro-hyperthermia-induced-loco-regional-and-systemic-tumor-destruction-in-colorectal-cancer-allografts
#1
Tamas Vancsik, Csaba Kovago, Eva Kiss, Edina Papp, Gertrud Forika, Zoltan Benyo, Nora Meggyeshazi, Tibor Krenacs
Background: Modulated electro-hyperthermia (mEHT), a non-invasive intervention using 13.56 MHz radiofrequency, can selectively target cancers due to their elevated glycolysis (Warburg-effect), extracellular ion concentration and conductivity compared to normal tissues. We showed earlier that mEHT alone can provoke apoptosis and damage associated molecular pattern (DAMP) signals in human HT29 colorectal cancer xenografts of immunocompromised mice. Materials: Here we tested the mEHT induced stress and immune responses in C26 colorectal cancer allografts of immunocompetent (BALB/c) mice between 12-72 h post-treatment...
2018: Journal of Cancer
https://www.readbyqxmd.com/read/29285261/use-of-autoantibodies-against-tumor-associated-antigens-as-serum-biomarkers-for-primary-screening-of-cervical-cancer
#2
Yingji Jin, Seung Cheol Kim, Hyoung Jin Kim, Woong Ju, Yun Hwan Kim, Hong-Jin Kim
Serum autoantibodies against tumor-associated antigens (TAAs) have received much attention as potential biomarkers for early detection of cancers, since they can be detected in the early stages of cancers. Autoantibodies against Cancer Antigen 15-3 (CA15-3), carcinoembryonic antigen (CEA), Cancer Antigen 19-9 (CA19-9), c-Myc, p53, heat shock protein (Hsp)27 and Hsp70 have been suggested as potential markers for detecting several types of cancer. In the present study, the seven types of antibody listed above were evaluated for detecting cervical lesions...
December 1, 2017: Oncotarget
https://www.readbyqxmd.com/read/29285257/sensitization-of-lung-cancer-cells-by-altered-dimerization-of-hsp27
#3
Byeol Choi, Seul-Ki Choi, You Na Park, Soo-Yeon Kwak, Hwa Jeong Lee, Youngjoo Kwon, Younghwa Na, Yun-Sil Lee
Heat shock protein 27 (HSP27, HSPB1) induces resistance to anticancer drugs in various cancer types, including non-small cell lung cancer (NSCLC). Therefore, pharmacological inhibition of HSP27 in NSCLC may be a good strategy for anticancer therapy. Unlike other HSPs such as HSP90 and HSP70, small molecule approaches for neutralization of HSP27 are not well established because of the absence of an ATP binding domain. Previously, small molecules with altered cross linking activity of HSP27, were identified to inhibit building a large oligomer led to sensitization in combination with radiation and chemotherapeutic drugs...
December 1, 2017: Oncotarget
https://www.readbyqxmd.com/read/29262311/cytotoxicity-of-demalonyl-thyrsiflorin-a-a-semisynthetic-labdane-derived-diterpenoid-to-melanoma-cells
#4
V Cardile, R Avola, A C E Graziano, M Piovano, A Russo
Diterpenes are compounds with complex structure and due to their unique carbon skeleton and interesting biological activities, have been the focus of continuous studies for the development of new anticancer agents. The plants of the genus Calceolaria (Scrophulariaceae family), native of South America have also yielded several new diterpenes with the scopadulane skeleton, such as thyrsiflorin A. The present study was undertaken to investigate the effect of the semisynthetic compound, demalonyl thyrsiflorin A on human melanoma cells...
December 17, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/29235112/heat-shock-protein-70-and-tumor-infiltrating-nk-cells-as-prognostic-indicators-for-patients-with-squamous-cell-carcinoma-of-the-head-and-neck-after-radiochemotherapy-a-multicentre-retrospective-study-of-the-german-cancer-consortium-radiation-oncology-group
#5
Stefan Stangl, Nikoletta Tontcheva, Wolfgang Sievert, Maxim Shevtsov, Minli Niu, Thomas E Schmid, Steffi Pigorsch, Stephanie E Combs, Bernhard Haller, Panagiotis Balermpas, Franz Rödel, Claus Rödel, Emmanouil Fokas, Mechthild Krause, Annett Linge, Fabian Lohhaus, Michael Baumann, Inge Tinhofer, Volker Budach, Martin Stuschke, Anca-Ligia Grosu, Amir Abdollahi, Jürgen Debus, Claus Belka, Cornelius Maihöfer, David Mönnich, Daniel Zips, Gabriele Multhoff
Tumor cells frequently overexpress heat shock protein 70 (Hsp70) and present it on their cell surface, where it can be recognized by pre-activated NK cells. In this retrospective study the expression of Hsp70 was determined in relation to tumor-infiltrating CD56+ NK cells in formalin-fixed paraffin embedded (FFPE) tumor specimens of patients with SCCHN (N=145) as potential indicators for survival and disease recurrence. All patients received radical surgery and postoperative cisplatinum-based radiochemotherapy (RCT)...
December 13, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/29233736/fumonisin-b1-induces-oxidative-stress-in-oesophageal-sno-cancer-cells
#6
René B Khan, Alisa Phulukdaree, Anil A Chuturgoon
Fumonisin B1 (FB1) is a ubiquitous contaminant of maize that is epidemiologically linked to oesophageal cancer (OC) in South Africa. FB1-induced oxidative stress mediates toxicity in animals and human cell lines, but the effects relating to OC are limited. Given the species-specific effects of FB1, this study investigated FB1-mediated toxicity and oxidative stress in spindle-shaped N-cadherin (+) CD45 (-) osteoblastic (SNO) cells. Following exposure to FB1 (0-20 μM) for 48 h, mitochondrial membrane potential and intracellular reactive oxygen species (iROS) were measured (flow cytometry)...
December 9, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29203711/membrane-heat-shock-protein-70-a-theranostic-target-for-cancer-therapy
#7
REVIEW
Maxim Shevtsov, Gao Huile, Gabriele Multhoff
Members of the 70 kDa stress protein family are found in nearly all subcellular compartments of nucleated cells where they fulfil a number of chaperoning functions. Heat shock protein 70 (HSP70), also termed HSPA1A, the major stress-inducible member of this family is overexpressed in a large variety of different tumour types. Apart from its intracellular localization, a tumour-selective HSP70 membrane expression has been determined. A membrane HSP70-positive tumour phenotype is associated with aggressiveness and therapy resistance, but also serves as a recognition structure for targeted therapies...
January 19, 2018: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/29203707/extracellular-cell-stress-heat-shock-proteins-immune-responses-and-disease-an-overview
#8
REVIEW
A Graham Pockley, Brian Henderson
Extracellular cell stress proteins are highly conserved phylogenetically and have been shown to act as powerful signalling agonists and receptors for selected ligands in several different settings. They also act as immunostimulatory 'danger signals' for the innate and adaptive immune systems. Other studies have shown that cell stress proteins and the induction of immune reactivity to self-cell stress proteins can attenuate disease processes. Some proteins (e.g. Hsp60, Hsp70, gp96) exhibit both inflammatory and anti-inflammatory properties, depending on the context in which they encounter responding immune cells...
January 19, 2018: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/29179452/novel-galeterone-analogs-act-independently-of-ar-and-ar-v7-for-the-activation-of-the-unfolded-protein-response-and-induction-of-apoptosis-in-the-cwr22rv1-prostate-cancer-cell-model
#9
David J McCarty, Weiliang Huang, Maureen A Kane, Puranik Purushottamachar, Lalji K Gediya, Vincent C O Njar
The androgen receptor (AR) has long been the primary target for the treatment of prostate cancer (PC). Despite continuous efforts to block AR activity through ligand depletion, AR antagonism, AR depletion and combinations thereof, advanced PC tumors remain resilient. Herein, we evaluate two galeterone analogs, VNPT-178 and VNLG-74A, in PC cell models of diverse androgen and AR dependence attempting to delineate their mechanisms of action and potential clinical utility. Employing basic biochemical techniques, we determined that both analogs have improved antiproliferative and anti-AR activities compared to FDA-approved abiraterone and enzalutamide...
October 24, 2017: Oncotarget
https://www.readbyqxmd.com/read/29177673/hsp70-a-cancer-target-inside-and-outside-the-cell
#10
Christophe Boudesco, Sebastien Cause, Gaëtan Jego, Carmen Garrido
Heat shock protein 70 (Hsp70) is the most ubiquitous stress-inducible chaperone. It accumulates in the cells in response to a wide variety of physiological and environmental insults including anticancer chemotherapy, thus allowing the cell to survive to lethal conditions. Intracellular Hsp70 is viewed as a cytoprotective protein. Indeed, this protein can inhibit key effectors of the apoptotic and autophagy machineries. In cancer cells, the expression of Hsp70 is abnormally high, and Hsp70 may participate in oncogenesis and in resistance to chemotherapy...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29177652/fluorescent-linked-enzyme-chemoproteomic-strategy-flecs-for-identifying-hsp70-inhibitors
#11
T A J Haystead
Activation of the heat shock response, and in particular upregulation of stress-inducible Hsp70, herein referred to as Hsp70i, in newly transformed cells, appears to protect against protein damaging stimuli, induction of premature oncogene-induced terminal senescence (OIS), and apoptosis, thereby enabling tumor initiation and progression to an aggressive phenotype. Expressed at very low or undetectable levels in normal tissue, the cytoprotective effects of Hsp70i appear to be mediated through its activity as a molecular chaperone allowing proper folding of mutated proteins, and by blocking cell signaling pathways that regulate OIS and apoptosis...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29156817/near-infrared-photothermal-therapy-using-anti-egfr-gold-nanorod-conjugates-for-triple-negative-breast-cancer
#12
Meihua Zhang, Hoe Suk Kim, Tiefeng Jin, Jisu Woo, Yin Ji Piao, Woo Kyung Moon
Current EGFR-targeted therapy for triple negative breast cancer (TNBC) has produced disappointing results. A rational therapeutic strategy to improve EGFR-targeted treatment for TNBC is therefore needed. In this study we evaluated the feasibility of treating TNBC using photoacoustic imaging (PAI)-guided near-infrared photothermal therapy (NIR-PTT) with anti-EGFR-conjugated gold nanorods (anti-EGFR-GN). NIR-PTT combined with anti-EGFR-GN exerted synergistic anti-proliferative and apoptotic actions through upregulation of HSP70 and cleaved caspase-3, downregulation of Ki-67 and EGFR, and inhibition of several intracellular signaling molecules (mTOR, AKT, ERK1/2 and FAK)...
October 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29137866/development-of-noviomimetics-that-modulate-molecular-chaperones-and-manifest-neuroprotective-effects
#13
Leah K Forsberg, Mercy Anyika, Zhenyuan You, Sean Emery, Mason McMullen, Rick T Dobrowsky, Brian S J Blagg
Heat shock protein 90 (Hsp90) is a chaperone under investigation for the treatment of cancer and neurodegenerative diseases. Neuroprotective Hsp90 C-terminal inhibitors derived from novobiocin (novologues) include KU-32 and KU-596. These novologues modulate molecular chaperones and result in an induction of Heat Shock Protein 70 (Hsp70). "Noviomimetics" replace the synthetically complex noviose sugar with a simple cyclohexyl moiety to maintain biological efficacy as compared to novologues KU-596 and KU-32...
October 18, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29137250/molecular-chaperones-in-the-acquisition-of-cancer-cell-chemoresistance-with-mutated-tp53-and-mdm2-up-regulation
#14
Zuzanna Tracz-Gaszewska, Marta Klimczak, Przemyslaw Biecek, Marcin Herok, Marcin Kosinski, Maciej B Olszewski, Patrycja Czerwińska, Milena Wiech, Maciej Wiznerowicz, Alicja Zylicz, Maciej Zylicz, Bartosz Wawrzynow
Utilizing the TCGA PANCAN12 dataset we discovered that cancer patients with mutations in TP53 tumor suppressor and overexpression of MDM2 oncogene exhibited decreased survival post treatment. Interestingly, in the case of breast cancer patients, this phenomenon correlated with high expression level of several molecular chaperones belonging to the HSPA, DNAJB and HSPC families. To verify the hypothesis that such a genetic background may promote chaperone-mediated chemoresistance, we employed breast and lung cancer cell lines that constitutively overexpressed heat shock proteins and have shown that HSPA1A/HSP70 and DNAJB1/HSP40 facilitated the binding of mutated p53 to the TAp73α protein...
October 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/29111316/concentrations-of-sp-a-and-hsp70-are-associated-with-polarization-of-macrophages-in-pleural-effusions-of-non-small-cell-lung-cancer
#15
Mariusz Kaczmarek, Malgorzata Lagiedo, Agnieszka Masztalerz, Magdalena Kozlowska, Agata Nowicka, Beata Brajer, Halina Batura-Gabryel, Jan Sikora
Damage-associated molecular pattern (DAMP) molecules can initiate an immune response through Toll-like receptors (TLRs). DAMPs are released from cells as a response to the extracellular danger and can be by-products of tissue damage. In cancer microenvironment necrotic cells release debris which has potency to become DAMPs. Non-small cell lung cancer (NSCLC) is often accompanied by pleural effusion (PE), which contains a variety of DAMPs. Surfactant protein A (SP-A) and heat shock protein 70 (Hsp70) are important DAMPs in the respiratory tract...
October 27, 2017: Immunobiology
https://www.readbyqxmd.com/read/29102083/cracking-the-chaperone-code-cellular-roles-for-hsp70-phosphorylation
#16
Nitika, Andrew W Truman
Heat shock protein 70 (Hsp70) is a molecular chaperone required for protein folding, cell viability, and cancer cell proliferation. Recent studies suggest that Hsp70 phosphorylation regulates important cellular processes, such as cell cycle progression, apoptosis, protein degradation, and resistance to anticancer therapeutics.
October 25, 2017: Trends in Biochemical Sciences
https://www.readbyqxmd.com/read/29093708/dynamics-of-heat-shock-protein-70-serum-levels-as-a-predictor-of-clinical-response-in-non-small-cell-lung-cancer-and-correlation-with-the-hypoxia-related-marker-osteopontin
#17
Christian Ostheimer, Sophie Gunther, Matthias Bache, Dirk Vordermark, Gabriele Multhoff
Hypoxia mediates resistance to radio(chemo)therapy (RT) by stimulating the synthesis of hypoxia-related genes, such as osteopontin (OPN) and stress proteins, including the major stress-inducible heat shock protein 70 (Hsp70). Apart from its intracellular localization, Hsp70 is also present on the plasma membrane of viable tumor cells that actively release it in lipid vesicles with biophysical characteristics of exosomes. Exosomal Hsp70 contributes to radioresistance while Hsp70 derived from dying tumor cells can serve as a stimulator of immune cells...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29061506/panaxynol-a-natural-hsp90-inhibitor-effectively-targets-both-lung-cancer-stem-and-non-stem-cells
#18
Huong Thuy Le, Huy Truong Nguyen, Hye-Young Min, Seung Yeob Hyun, Soonbum Kwon, Yeongcheol Lee, Thi Hong Van Le, Jeeyeon Lee, Jeong Hill Park, Ho-Young Lee
Cancer stem-like cells (CSCs) contribute to tumor recurrence and chemoresistance. Hence, strategies targeting CSCs are crucial for effective anticancer therapies. Here, we demonstrate the capacities of the non-saponin fraction of Panax ginseng and its active principle panaxynol to inhibit Hsp90 function and viability of both non-CSC and CSC populations of NSCLC in vitro and in vivo. Panaxynol inhibited the sphere forming ability of NSCLC CSCs at nanomolar concentrations, and micromolar concentrations of panaxynol suppressed the viability of NSCLC cells (non-CSCs) and their sublines carrying acquired chemoresistance with minimal effect on normal cells derived from various organs...
October 20, 2017: Cancer Letters
https://www.readbyqxmd.com/read/29023986/evaluation-of-short-and-long-term-efficacy-of-chemoradiotherapy-for-advanced-cervical-cancer-using-hsp70-protein-combined-with-multimodal-mri
#19
Yun-Xiang Qi, Kun Liu, Jun Yin, Lu Li
This study aims to evaluate the efficacy of chemoradiotherapy for advanced cervical cancer using heat shock protein 70 (HSP70) combined with multimodal MRI. The protein expressions of HSP70 in biopsy specimens obtained from 101 patients with cervical cancer were detected by immunohistochemistry. Plain MRI scan, DWI, DCE-MR and MRS were performed before and after a period of six months of chemoradiotherapy. All patients were assigned into the complete response (CR) and partial response (PR) groups. HSP70 protein expression, tumor diameter and tumor volume were lower in the CR group than in the PR group...
October 11, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29017815/rna-polymerase-ii-pausing-and-transcriptional-regulation-of-the-hsp70-expression
#20
REVIEW
Heeyoun Bunch
Heat-shock proteins (HSPs) belong to the chaperone protein family whose expression is induced by different stresses including heat-shock. In response to the extracellular or intrinsic stimuli and stresses, HSPs play important roles in the maintenance of cellular homeostasis. HSP70, a major HSP protein (molecular weight, 70 KDa), regulates diverse cellular pathways including protein quality control, translation, immune response, and cancer survival. As a critical cellular defense system to minimize damages from cellular stresses, HSP70 expression and transcriptional activation are rapidly regulated, mainly through the action of a transcription activator, Heat shock factor 1 (HSF1)...
October 3, 2017: European Journal of Cell Biology
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