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Apoptosis, cancer

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https://www.readbyqxmd.com/read/27936394/increased-intracellular-ca-2-decreases-cisplatin-resistance-by-regulating-inos-expression-in-human-ovarian-cancer-cells
#1
Yang Yu, Qi Xie, Weimin Liu, Yuting Guo, Na Xu, Lu Xu, Shibing Liu, Songyan Li, Ye Xu, Liankun Sun
Previous studies have reported that intracellular Ca(2+) signals and inducible nitric oxide synthase (iNOS) are involved in cell apoptosis. However, the role of iNOS in cisplatin resistance in ovarian cancer remains unclear. Here, we demonstrate that SKOV3/DDP ovarian cancer cells were more resistant to cisplatin than were SKOV3 ovarian cancer cells. The expression of intracellular Ca(2+) and iNOS was more strongly induced by cisplatin in SKOV3 cells than in SKOV3/DDP cells. TAT-conjugated IP3R-derived peptide (TAT-IDP(S)) increased cisplatin-induced iNOS expression and apoptosis in SKOV3/DDP cells...
December 6, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27936237/the-immunomodulatory-small-molecule-imiquimod-induces-apoptosis-in-devil-facial-tumour-cell-lines
#2
Amanda L Patchett, Jocelyn M Darby, Cesar Tovar, A Bruce Lyons, Gregory M Woods
The survival of the Tasmanian devil (Sarcophilus harrisii) is threatened by devil facial tumour disease (DFTD). This transmissible cancer is usually fatal, and no successful treatments have been developed. In human studies, the small immunomodulatory molecule imiquimod is a successful immunotherapy, activating anti-tumour immunity via stimulation of toll-like receptor-7 (TLR7) signaling pathways. In addition, imiquimod is a potent inducer of apoptosis in human tumour cell lines via TLR7 independent mechanisms...
2016: PloS One
https://www.readbyqxmd.com/read/27936114/long-circulating-curcumin-loaded-liposome-formulations-with-high-incorporation-efficiency-stability-and-anticancer-activity-towards-pancreatic-adenocarcinoma-cell-lines-in-vitro
#3
Mohamed Mahmud, Adriana Piwoni, Nina Filiczak, Martyna Janicka, Jerzy Gubernator
The incorporation of hydrophobic drugs into liposomes improve their bioavailability and leads to increased stability and anticancer activity, along with decreased drug toxicity. Curcumin (Cur) is a natural polyphenol compound with a potent anticancer activity in pancreatic adenocarcinoma (PA). In the present study, different types of Cur-loaded liposomal formulations were prepared and characterized in terms of size, shape, zeta potential, optimal drug-to-lipid ratio and stability at 4°C, 37°C; and in human plasma in vitro...
2016: PloS One
https://www.readbyqxmd.com/read/27936075/ophiobolin-a-induces-autophagy-and-activates-the-mitochondrial-pathway-of-apoptosis-in-human-melanoma-cells
#4
Carlo Rodolfo, Mariapina Rocco, Lucia Cattaneo, Maria Tartaglia, Mauro Sassi, Patrizia Aducci, Andrea Scaloni, Lorenzo Camoni, Mauro Marra
Ophiobolin A, a fungal toxin from Bipolaris species known to affect different cellular processes in plants, has recently been shown to have anti-cancer activity in mammalian cells. In the present study, we investigated the anti-proliferative effect of Ophiobolin A on human melanoma A375 and CHL-1 cell lines. This cellular model was chosen because of the incidence of melanoma malignant tumor on human population and its resistance to chemical treatments. Ophyobolin A strongly reduced cell viability of melanoma cells by affecting mitochondrial functionality...
2016: PloS One
https://www.readbyqxmd.com/read/27935869/the-involvement-of-bcl-2-family-proteins-in-akt-regulated-cell-survival-in-cisplatin-resistant-epithelial-ovarian-cancer
#5
Yan Dai, Shiguang Jin, Xueping Li, Daxin Wang
Many studies involving patients with cisplatin-resistant ovarian cancer have shown that AKT activation leads to inhibition of apoptosis. The aim of this study was to examine the potential involvement of the Bcl-2 family proteins in AKT-regulated cell survival in response to cisplatin treatment. Cisplatin-sensitive (PEO1) and cisplatin-resistant (PEO4) cells were taken from ascites of patients with ovarian cancer before cisplatin treatment and after development of chemoresistance. It was found that cisplatin treatment activated the AKT signaling pathway and promoted cell proliferation in cisplatin-resistant EOC cells...
December 7, 2016: Oncotarget
https://www.readbyqxmd.com/read/27935858/paradoxical-induction-of-growth-arrest-and-apoptosis-by-egf-via-the-up-regulation-of-pten-by-activating-redox-factor-1-egr-1-in-human-lung-cancer-cells
#6
Je-Won Ryu, Sung Sik Choe, Seung-Hee Ryu, Eun-Young Park, Byoung Wook Lee, Tae Keun Kim, Chang Hoon Ha, Sang-Wook Lee
Epidermal growth factor (EGF) signaling promotes cell proliferation and survival in several types of cancer. Here, however, we showed that EGF inhibits proliferation and promotes programmed cell death in non-small cell lung cancer (NSCLC) cells. In A549 cells, EGF increased redox factor-1 (Ref-1) expression and the association of Ref-1 with zinc finger-containing transcriptional regulator (EGR1) via activation of p22phox, RAC1, and an NADPH oxidase subunit. EGF increased p22phox and RAC1 expression through activation of purinergic receptors (P2Y)...
December 7, 2016: Oncotarget
https://www.readbyqxmd.com/read/27935748/atf4-targets-ret-for-degradation-and-is-a-candidate-tumor-suppressor-gene-in-medullary-thyroid-cancer
#7
Rozita Bagheri-Yarmand, Michelle D Williams, Elizabeth G Grubbs, Robert F Gagel
CONTEXT: Medullary thyroid cancer (MTC) is an aggressive tumor that harbors activating mutations of the RET proto-oncogene. We previously reported that RET inhibits transcriptional activity of ATF4, the master regulator of the stress response pathway, to prevent cell death. OBJECTIVE: We hypothesized that loss of function of ATF4 play a role in initiation of MTC. DESIGN: Targeted deletion of ATF4 in mice was used to assess ATF4 function in the thyroid gland...
December 9, 2016: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27935584/ketogenesis-contributes-to-intestinal-cell-differentiation
#8
Qingding Wang, Yuning Zhou, Piotr Rychahou, Teresa W-M Fan, Andrew N Lane, Heidi L Weiss, B Mark Evers
The intestinal epithelium undergoes a continual process of proliferation, differentiation and apoptosis. Previously, we have shown that the PI3K/Akt/mTOR pathway has a critical role in intestinal homeostasis. However, the downstream targets mediating the effects of mTOR in intestinal cells are not known. Here, we show that the ketone body β-hydroxybutyrate (βHB), an endogenous inhibitor of histone deacetylases (HDACs) induces intestinal cell differentiation as noted by the increased expression of differentiation markers (Mucin2 (MUC2), lysozyme, IAP, sucrase-isomaltase, KRT20, villin, Caudal-related homeobox transcription factor 2 (CDX2) and p21(Waf1))...
December 9, 2016: Cell Death and Differentiation
https://www.readbyqxmd.com/read/27935425/how-is-herstatin-a-tumour-suppressor-splice-variant-of-the-oncogene-her2-regulated
#9
Marco Silipo, Hannah Gautrey, Swapna Satam, Thomas Lennard, Alison Tyson-Capper
The human epidermal growth factor receptor 2 (HER2)/receptor tyrosine-protein kinasebB-2 (ERBB2) is over-expressed in 20-30% of breast tumours leading to faster growing and more aggressive tumours. Alternative splicing generates a functionally distinct HER2 variant called Herstatin, which is produced by the inclusion of intron 8. Herstatin acts as a tumour suppressor by effectively blocking HER2 activity and cell proliferation, while promoting apoptosis. In the present study we investigated HER2 pre-mRNA regulatory sequences and splicing factors which regulate the alternative splicing of Herstatin...
December 9, 2016: RNA Biology
https://www.readbyqxmd.com/read/27935327/activation-induced-cell-death-aicd-of-human-melanoma-antigen-specific-tcr-engineered-cd8-t-cells-involves-jnk-bim-and-p53
#10
Arvind Chhabra, Bijay Mukherji, Deepika Batra
OBJECTIVES: Adoptive cancer immunotherapy (ACT) with transgenic T cell receptor (TCR) engineered (TCReng) anti-tumor T cells has produced encouraging results, however, efficacy of these approaches need improvement. Since premature activation induced cell death (AICD) of adoptively administered T cells could be a major impediment, we examined the mechanism(s) underlying AICD in TCReng CD8+ cytolytic T lymphocytes (CTL). METHODS: AICD in human tumor antigen specific MHC class I restricted TCR engineered CD8+ CTL was induced by exposing them to cognate peptide epitope...
December 9, 2016: Expert Opinion on Therapeutic Targets
https://www.readbyqxmd.com/read/27935117/long-noncoding-rna-malat1-affects-the-efficacy-of-radiotherapy-for-esophageal-squamous-cell-carcinoma-by-regulating-cks1-expression
#11
Zhijun Li, Yang Zhou, Bo Tu, Yu Bu, Aqiu Liu, Conghua Xie
OBJECTIVE: Long noncoding RNA MALAT1 has been well-studied in the progression of many malignancies. However, its association with the radioresistance of tumors has not been well-understood yet. This study tried to explore the role of MALAT1 in regulating the radiosensitivity of esophageal cancer (EC), especially esophageal squamous cell carcinoma (ESCC), involving its regulation on Cks1 expression. METHODS: KYSE150 cells were subcutaneously inoculated into nude mice to establish ESCC xenografts...
December 9, 2016: Journal of Oral Pathology & Medicine
https://www.readbyqxmd.com/read/27935099/mcpip1-exogenous-overexpression-inhibits-pathways-regulating-mycn-oncoprotein-stability-in-neuroblastoma
#12
Elżbieta Boratyn, Iwona Nowak, Małgorzata Durbas, Irena Horwacik, Anna Sawicka, Hanna Rokita
The main physiological function of MCPIP1 (regnase-1) is negative regulation of inflammation. Moreover, roles of regnase-1 in apoptosis and differentiation have also been described, but its involvement in cancer is yet to be fully recognized. Earlier, we showed a lack of expression of MCPIP1 in both primary tumors and several neuroblastoma cell lines. Additionally, we reported that levels of MCPIP1 and the key neuroblastoma oncoprotein - MYCN were inversely correlated in BE(2)-C clones overexpressing the MCPIP1 gene...
December 9, 2016: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/27935061/autophagy-in-uv-damage-response
#13
Ashley Sample, Yu-Ying He
UV radiation exposure from sunlight and artificial tanning beds is the major risk factor for the development of skin cancer and skin photoaging. UV-induced skin damage can trigger a cascade of DNA damage response signaling pathways, including cell cycle arrest, DNA repair, and, if damage is irreparable, apoptosis. Compensatory proliferation replaces the apoptotic cells to maintain skin barrier integrity. Disruption of these processes can be exploited to promote carcinogenesis by allowing the survival and proliferation of damaged cells...
December 9, 2016: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/27934959/hopx-functions-as-a-tumour-suppressor-in-head-and-neck-cancer
#14
Lee Fah Yap, Sook Ling Lai, Sathya Narayanan Patmanathan, Ravindran Gokulan, C Max Robinson, Joe B White, San Jiun Chai, Pathmanathan Rajadurai, Narayanan Prepageran, Yew Toong Liew, Victor Lopes, Wenbin Wei, Robert J Hollows, Paul G Murray, Daniel W Lambert, Keith D Hunter, Ian C Paterson
Head and neck squamous cell carcinoma (HNSCC) is generalized term that encompasses a diverse group of cancers that includes tumours of the oral cavity (OSCC), oropharynx (OPSCC) and nasopharynx (NPC). Genetic alterations that are common to all HNSCC types are likely to be important for squamous carcinogenesis. In this study, we have investigated the role of the homeodomain-only homeobox gene, HOPX, in the pathogenesis of HNSCC. We show that HOPX mRNA levels are reduced in OSCC and NPC cell lines and tissues and there is a general reduction of HOPX protein expression in these tumours and OPSCCs...
December 9, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27934692/in-the-midst-of-life-cell-death-what-is-it-what-is-it-good-for-and-how-to-study-it
#15
John Silke, Ricky W Johnstone
Cell death, one of the most fundamental biological processes, has not made it into the public consciousness in the same way that genetic inheritance, cell division, or DNA replication has. Everyone knows they get their genes from their parents, but few would be aware that even before they were born a lot of essential cell death has shaped their development. The greater population, for the most part, is blissfully unaware that every day millions of their own cells die in a programmed way and that this is essential for normal human physiology-their well-being, in fact...
December 1, 2016: Cold Spring Harbor Protocols
https://www.readbyqxmd.com/read/27934691/dead-cert-measuring-cell-death
#16
Lisa C Crowley, Brooke J Marfell, Adrian P Scott, Jeanne A Boughaba, Grace Chojnowski, Melinda E Christensen, Nigel J Waterhouse
Many cells in the body die at specific times to facilitate healthy development or because they have become old, damaged, or infected. Defects in cells that result in their inappropriate survival or untimely death can negatively impact development or contribute to a variety of human pathologies, including cancer, AIDS, autoimmune disorders, and chronic infection. Cell death may also occur following exposure to environmental toxins or cytotoxic chemicals. Although this is often harmful, it can be beneficial in some cases, such as in the treatment of cancer...
December 1, 2016: Cold Spring Harbor Protocols
https://www.readbyqxmd.com/read/27934311/a-switch-on-nir-probe-for-specific-detection-of-hg-2-ion-in-aqueous-medium-and-in-mitochondria
#17
Hridesh Agarwalla, Pankaj S Mahajan, Debashis Sahu, Nandaraj Taye, Bishwajit Ganguly, Santosh B Mhaske, Samit Chattopadhyay, Amitava Das
A new 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY)-based probe molecule (L) is synthesized for specific binding to Hg(2+) ion in physiological condition with an associated luminescence ON response in the near-IR region of the spectrum. Appropriate functionalization in the 5-position of each of two pyrrole moieties with styryl functionality in a BODIPY core helped us in achieving the extended conjugation and a facile intramolecular charge transfer transition with a narrow energy gap for frontier orbitals...
November 21, 2016: Inorganic Chemistry
https://www.readbyqxmd.com/read/27934178/zinc-oxide-flower-like-nanostructures-that-exhibit-enhanced-toxicology-effects-in-cancer-cells
#18
Iêda M M Paino, Fernanda J Gonçalves, Flavio L Souza, Valtencir Zucolotto
Nanostructured zinc oxide (ZnO) materials have been intensively studied because of their potential applications in cancer therapies. However, a better comprehension of the toxicity of the flower-like ZnO nanostructures toward cancer cells is still needed. In this study, we investigate the cytotoxicity of a ZnO flower-like nanostructure produced at low temperature via aqueous solution in human cervical carcinoma (HeLa) cells and noncancerous cell-line murine fibroblast (L929) cells. Nanotoxicology effects were analyzed to study apoptosis and necrosis processes, reactive oxygen species production, and cellular uptake...
December 7, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27934080/remote-control-of-light-triggered-virotherapy
#19
S-Ja Tseng, Kuo-Yen Huang, Ivan M Kempson, Shih-Han Kao, Meng-Chia Liu, Shuenn-Chen Yang, Zi-Xian Liao, Pan-Chyr Yang
Clinical virotherapy has been successfully approved for use in cancer treatment by the U.S. Food and Drug Administration; however, a number of improvements are still sought to more broadly develop virotherapy. A particular challenge is to administer viral therapy systemically and overcome limitations in intratumoral injection, especially for complex tumors within sensitive organs. To achieve this, however, a technique is required that delivers the virus to the tumor before the body's natural self-defense eradicates the virus prematurely...
November 22, 2016: ACS Nano
https://www.readbyqxmd.com/read/27934069/blood-brain-barrier-penetrating-albumin-nanoparticles-for-biomimetic-drug-delivery-via-albumin-binding-protein-pathways-for-antiglioma-therapy
#20
Tingting Lin, Pengfei Zhao, Yifan Jiang, Yisi Tang, Hongyue Jin, Zhenzhen Pan, Huining He, Victor C Yang, Yongzhuo Huang
Nutrient transporters have been explored for biomimetic delivery targeting the brain. The albumin-binding proteins (e.g., SPARC and gp60) are overexpressed in many tumors for transport of albumin as an amino acid and an energy source for fast-growing cancer cells. However, their application in brain delivery has rarely been investigated. In this work, SPARC and gp60 overexpression was found on glioma and tumor vessel endothelium; therefore, such pathways were explored for use in brain-targeting biomimetic delivery...
November 22, 2016: ACS Nano
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