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https://www.readbyqxmd.com/read/28719026/in-vitro-antiproliferative-and-antibacterial-activities-of-essential-oils-from-four-species-of-guatteria
#1
Anderson R Santos, Thalita Gilda S Benghi, Angelita Nepel, Francisco A Marques, Adriana Q Lobão, Marta Cristina T Duarte, Ana Lúcia T G Ruiz, João E Carvalho, Beatriz H L N S Maia
The essential oils extracted from four species of the genus Guatteria, G.australis, G. ferruginea, G. latifolia and G. sellowiana were analyzed. A total of 24, 22, 25 and 19 constituents of the oils from four species, respectively, were identified by GC-MS. These oils showed qualitative and quantitative differences. All the oils contained the oxygenated sesquiterpenes spathulenol (11.04 - 40.29%) and caryophyllene oxide (7.74 - 40.13%) as predominant constituents. Evaluation of antiproliferative activity of the essential oils showed strong selectivity (1...
July 18, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/28718980/an-endogenous-dna-adduct-as-a-prognostic-biomarker-for-hepatocarcinogenesis-and-its-prevention-by-theaphenon-e-in-mice
#2
Ying Fu, Shana Silverstein, Justine N McCutcheon, Marcin Dyba, Raghu G Nath, Monika Aggarwal, Heidi Coia, Angela Bai, Jishen Pan, Jiji Jiang, Bhaskar Kallakury, Hongkun Wang, Yu-Wen Zhang, Giuseppe Giaccone, Aiwu Ruth He, Fung-Lung Chung
Hepatocellular carcinoma (HCC) is the third leading cause of cancer-related deaths worldwide, mainly because of its poor prognosis. A valid mechanism-based prognostic biomarker is urgently needed. γ-hydroxy-1,N(2) -propanodeoxyguanosine (γ-OHPdG) is an endogenously formed mutagenic DNA adduct derived from lipid peroxidation (LPO). We examined the relationship of γ-OHPdG with hepatocarcinogenesis in two animal models and its potential role as a prognostic biomarker for recurrence in HCC patients. Bioassays were conducted in the Xeroderma pigmentosum group A knockout mice (Xpa(-/-) ), and the diethylnitrosamine (DEN)-injected mice, both prone to HCC development...
July 18, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28718972/enhancement-of-mtor-signaling-contributes-to-acquired-x-ray-and-c-ion-resistance-in-mouse-squamous-carcinoma-cell-line
#3
Katsutoshi Sato, Rikako Azuma, Takashi Imai, Takashi Shimokawa
Our aim was to evaluate whether repetition of C-ion (carbon ion beam) irradiation induces radioresistance as well as repeated X-ray irradiation in cancer cell lines, and to find the key molecular pathway for radioresistance by comparing radioresistant cancer cells with their parental cells. A mouse squamous cell carcinoma cell line, NR-S1, and radioresistant cancer cells, NR-S1-C30 (C30) and NR-S1-X60 (X60) established by repetition of C-ion and X-ray irradiation respectively, were used. X-ray and C-ion sensitivity, changes in lysosome, mitochondria, intracellular ATP and ROS (reactive oxygen species) level, and mTOR (mechanistic target of rapamycin) signaling were evaluated...
July 18, 2017: Cancer Science
https://www.readbyqxmd.com/read/28718813/suppression-of-nrf2-activity-by-chestnut-leaf-extract-increases-chemosensitivity-of-breast-cancer-stem-cells-to-paclitaxel
#4
Yaejin Woo, Jisun Oh, Jong-Sang Kim
Due to metastatic potential and drug resistance, cancer stem cells (CSCs) have become a critical target for the development of chemotherapeutic agents. Recent studies showed that CSCs highly express NF-E2-related factor 2 (Nrf2)-mediated antioxidant enzymes and thereby retain relatively low levels of reactive oxygen species (ROS). Since anticancer agents usually utilize ROS as an arsenal for killing cancer cells, we hypothesized that inhibition of Nrf2 activity could increase the sensitivity of CSCs to anticancer drugs, and thus enhancing their therapeutic efficacy...
July 18, 2017: Nutrients
https://www.readbyqxmd.com/read/28718722/anticarcinogenic-effects-of-dried-citrus-peel-in-colon-carcinogenesis-due-to-inhibition-of-oxidative-stress
#5
Wakana Onuma, Daichi Asai, Susumu Tomono, Shingo Miyamoto, Gen Fujii, Takahiro Hamoya, Aya Nagano, Satoru Takahashi, Shoji Masumori, Noriyuki Miyoshi, Keiji Wakabayashi, Michihiro Mutoh
Colorectal cancer is one of the leading causes of death worldwide. Reactive oxygen species produce oxidative stress and contribute to colorectal carcinogenesis. Because dietary citrus has been shown to reduce oxidative stress, we investigated the effects of citrus peel extract at dilutions of 1/200-1/500 on the activity of oxidative-stress-related transcription factors, including AP-1, NF-κB, NRF2, p53, and STAT3, in human colon cancer cell line HCT116 cells using a luciferase reporter gene assay. NRF2 transcriptional activities were 1...
July 18, 2017: Nutrition and Cancer
https://www.readbyqxmd.com/read/28718669/fruit-peel-polyphenolic-extract-induced-apoptosis-in-human-breast-cancer-cells-is-associated-with-ros-production-and-modulation-of-p38mapk-erk1-2-and-the-akt-signaling-pathway
#6
Martin Kello, Lucia Kulikova, Janka Vaskova, Alexandra Nagyova, Jan Mojzis
Polyphenols represent a large group of natural substances with different biological properties. Currently, polyphenols are well studied due to their free radicals' scavenging and antioxidant activities. However, some studies indicate that polyphenols also exhibit pro-oxidant properties. In this study, the possible involvement of the pro-oxidant activities of fruit polyphenols was investigated in relation to apoptosis induction. To determine the type of cell death induced by fruit polyphenols (Flavine; F7), we assessed a series of assays, including measurements of caspase-7 activation, membrane mitochondrial potential changes, reactive oxygen (ROS) and nitrogen species production, lipid peroxidation, antioxidant enzymes activities, and PARP cleavage...
July 18, 2017: Nutrition and Cancer
https://www.readbyqxmd.com/read/28718423/angiogenesis-and-metabolism-entwined-for-therapy-resistance
#7
REVIEW
Gabriela Jiménez-Valerio, Oriol Casanovas
Angiogenesis and metabolism are entwined processes that permit tumor growth and progression. Blood vessel supply is necessary for tumor survival not only by providing oxygen and nutrients for anabolism but also by removing waste products from cellular metabolism. On the other hand, blocking angiogenesis with antiangiogenic therapies shows clinical benefits in treating several tumor types. Nevertheless, resistance to therapy emerges over time. In this review we discuss a novel mechanism of adaptive resistance involving metabolic adaptation of tumor cells, and we also provide examples of tumor adaptation to therapy, which may represent a new mechanism of resistance in several types of cancer...
January 2017: Trends in Cancer
https://www.readbyqxmd.com/read/28718286/functionalized-selenium-nanosystem-as-radiation-sensitizer-of-125i-seeds-for-precise-cancer-therapy
#8
Yahui Yang, Qiang Xie, Zhennan Zhao, Lizhen He, Leung Chan, Yingxiang Liu, Yongle Chen, Mingjun Bai, Tao Pan, Yanni Qu, Long Ling, Tianfeng Chen
Although radiotherapy has been extensively applied in cancer treatment, external beam radiation therapy is still difficult to avoid damage to adjacent normal tissues in the process of delivering a sufficient radiation dose to the tumor sites of patients. To overcome this limitation, chemoradiotherapy, as a combination of chemotherapy and radiotherapy of radioactive seed, has been proposed to decrease the damage for tumor surrounding tissues and enhance the radiosensitivity of solid tumors. In the study, we designed and synthesized folic acid-conjugated selenium nanoparticles (FA@SeNPs) as cancer-targeting agent, which could be synergistically enhanced by the radioactive 125I seeds to realize anticancer efficacy and inhibited colony formation ability...
July 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28716752/anticancer-activity-of-silver-and-copper-embedded-chitin-nanocomposites-against-human-breast-cancer-mcf-7-cells
#9
Dhanasekaran Solairaj, Palanivel Rameshthangam, Gnanapragasam Arunachalam
Chitin is a natural biopolymer widely used in biomedical and environmental applications due to its distinctive physical, chemical and mechanical properties. Although the anticancer property of chitin nanoforms and chitin derivatives against various cancers were studied earlier, there is no report in the chitin nanostructure incorporated metal nanocomposite. The present study was aimed to investigate the cytotoxicity of chitin incorporated silver and copper nanocomposite against human breast cancer (MCF-7) cells...
July 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28716739/phototoxicity-in-a-laryngeal-cancer-cell-line-enhanced-by-a-targeting-amphiphilic-chlorin-photosensitizer
#10
Milene N O Moritz, Carlos Rossa, Kleber T de Oliveira, Marciana P Uliana, Janice R Perussi
BACKGROUND: Photodynamic therapy (PDT) has been established in several countries as an alternative therapy for the treatment of various malignancies. This therapy involves the incorporation of a photosensitizer (PS) that is activated by visible light and form reactive oxygen species leading to target cell death by apoptosis or necrosis. Previously, our group has demonstrated that CHL-T (semi-synthesized from chlorophyll a and containing a linked solubilizing group TRISMA(®)) presented a pronounced potential to induce death in HeLa cell line after PDT...
July 14, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28716495/3-5-bis-3-dimethylaminomethyl-4-hydroxybenzylidene-4-piperidone-and-related-compounds-induce-glutathione-oxidation-and-mitochondria-mediated-cell-death-in-hct-116-colon-cancer-cells
#11
Eshwari Addala, Hossein Rafiei, Swagatika Das, Brian Bandy, Umashankar Das, Subhas S Karki, Jonathan R Dimmock
This study aims at investigating the cytotoxicity and some of the modes of action of 3,5-bis(3-dimethylamino-4-hydroxybenzylidene)-4-piperidone trihydrochloride 3 and two related compounds 2 (which lacks the dimethylaminomethyl groups) and 4 (which has an additional dimethylaminoethyl substituent in both aryl rings) in order to ascertain the contribution of dimethylaminoethyl substituent to bioactivity. The bioactivities of 2-4 were compared with curcumin 5. Both 2 and 3 displayed submicromolar GI50 values towards HCT-116 cells and were significantly more potent than 4, 5 and 5-fluorouracil (5-FU)...
July 5, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28715876/combining-trail-and-liquiritin-exerts-synergistic-effects-against-human-gastric-cancer-cells-and-xenograft-in-nude-mice-through-potentiating-apoptosis-and-ros-generation
#12
Rui Xie, Cheng-Cheng Gao, Xiao-Zhong Yang, Shang-Nong Wu, Hong-Gang Wang, Jia-Ling Zhang, Wei Yan, Tian-Heng Ma
Gastric cancer is one of the most factors, leading to cancer-related death worldwide. However, the therapies to prevent gastric cancer are still limited and the emergence of drug resistance leads to development of new anti-cancer drugs and combinational chemotherapy regimens. Our study was aimed to explore the anti-gastric cancer effects of liquiritin (LIQ), a major constituent of Glycyrrhiza Radix, which possesses a variety of pharmacological activities. The tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) preferentially inhibited tumor cells over other normal cells, when used in alone or in combination...
July 13, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28714931/correlation-between-oxidative-stress-nutrition-and-cancer-initiation
#13
REVIEW
Subbroto Kumar Saha, Soo Bin Lee, Jihye Won, Hye Yeon Choi, Kyeongseok Kim, Gwang-Mo Yang, Ahmed Abdal Dayem, Ssang-Goo Cho
Inadequate or excessive nutrient consumption leads to oxidative stress, which may disrupt oxidative homeostasis, activate a cascade of molecular pathways, and alter the metabolic status of various tissues. Several foods and consumption patterns have been associated with various cancers and approximately 30-35% of the cancer cases are correlated with overnutrition or malnutrition. However, several contradictory studies are available regarding the association between diet and cancer risk, which remains to be elucidated...
July 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28714351/activation-of-nlrp3-inflammasome-in-peripheral-nerve-contributes-to-paclitaxel-induced-neuropathic-pain
#14
Min Jia, Caihua Wu, Fang Gao, Hongchun Xiang, Ning Sun, Ping Peng, Jingjing Li, Xiaocui Yuan, Hongping Li, Xianfang Meng, Bo Tian, Jing Shi, Man Li
Background Paclitaxel is commonly used as a cancer chemotherapy drug that frequently causes peripheral neuropathic pain. Inflammasome is a multiprotein complex consisting of Nod-like receptor proteins (NLRPs), apoptosis-associated speck-like protein, and caspase-1, which functions to switch on the inflammatory process and the release of interleukin-1β. Growing evidences have supported that peripheral interleukin-1β is critical in enhancing paclitaxel-induced neuropathic pain. However, whether activation of NLRP3 inflammasome in peripheral nerve contributes to paclitaxel-induced neuropathic pain is still unclear...
January 2017: Molecular Pain
https://www.readbyqxmd.com/read/28713895/role-of-quercetin-in-protecting-arpe%C3%A2-19-cells-against-h2o2%C3%A2-induced-injury-via-nuclear-factor-erythroid-2-like-2%C3%A2-pathway-activation-and-endoplasmic-reticulum-stress-inhibition
#15
Sisi Weng, Lei Mao, Yuanyuan Gong, Tao Sun, Qing Gu
Age‑related macular degeneration (AMD) is a common cause of irreversible blindness in the elderly in the western world. Research has demonstrated that degenerative and progressive conditions of retinal pigmented epithelial (RPE) cells are the key pathogenic mechanisms in AMD. Previous research has indicated the anti‑apoptosis, anti‑oxidant, anti‑inflammatory and anti‑cancer properties of quercetin. Therefore, the present study aimed to investigate the protective effects of quercetin on the ARPE‑19 human retinal pigment epithelial cell line...
July 13, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28713771/integrating-hyperthermia-into-modern-radiation-oncology-what-evidence-is-necessary
#16
REVIEW
Jan C Peeken, Peter Vaupel, Stephanie E Combs
Hyperthermia (HT) is one of the hot topics that have been discussed over decades. However, it never made its way into primetime. The basic biological rationale of heat to enhance the effect of radiation, chemotherapeutic agents, and immunotherapy is evident. Preclinical work has confirmed this effect. HT may trigger changes in perfusion and oxygenation as well as inhibition of DNA repair mechanisms. Moreover, there is evidence for immune stimulation and the induction of systemic immune responses. Despite the increasing number of solid clinical studies, only few centers have included this adjuvant treatment into their repertoire...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28713383/the-toxicological-mechanisms-of-environmental-soot-black-carbon-and-carbon-black-focus-on-oxidative-stress-and-inflammatory-pathways
#17
REVIEW
Rituraj Niranjan, Ashwani Kumar Thakur
The environmental soot and carbon blacks (CBs) cause many diseases in humans, but their underlying mechanisms of toxicity are still poorly understood. Both are formed after the incomplete combustion of hydrocarbons but differ in their constituents and percent carbon contents. For the first time, "Sir Percival Pott" described soot as a carcinogen, which was subsequently confirmed by many others. The existing data suggest three main types of diseases due to soot and CB exposures: cancer, respiratory diseases, and cardiovascular dysfunctions...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28713002/photo-stimulation-of-persistent-luminescence-nanoparticles-enhances-cancer-cells-death
#18
Gonzalo Ramírez-García, Minerva Martínez-Alfaro, Fanny d'Orlyé, Fethi Bedioui, Nathalie Mignet, Anne Varenne, Silvia Gutiérrez-Granados, Cyrille Richard
Persistent luminescence nanoparticles made of ZnGa1.995Cr0.005O4 (ZGO-NPs) are innovative nanomaterials that emit photons during long periods of time after the end of the excitation, allowing their use as diagnosis probes for in vivo optical imaging. During the excitation process, a part of the energy is stored in traps to further emit photons over long time. However, we observed in this study that some of the energy reduces molecular oxygen to produce reactive oxygen species (ROS). Following this observation, theoxidative stress induction and cytotoxic effects of these NPs were investigated on human breast cancer cells...
July 13, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28712859/tyr42-phosphorylation-of-rhoa-gtpase-promotes-tumorigenesis-through-nuclear-factor-nf-%C3%AE%C2%BAb
#19
Jae-Gyu Kim, Kyoung-Chan Choi, Chang-Won Hong, Hwee-Seon Park, Eun-Kyoung Choi, Yong-Sun Kim, Jae-Bong Park
Dysregulation of reactive oxygen species (ROS) levels is implicated in the pathogenesis of several diseases, including cancer. However, the molecular mechanisms of ROS in tumorigenesis have not been clearly elucidated. Hydrogen peroxide activated nuclear factor-κB (NF-κB) and RhoA GTPase. In particular, we found that hydrogen peroxide phosphorylated RhoA at Tyr42 via Src. P-Ty42 residue of RhoA was a binding site of Vav2, a guanine nucleotide exchange factor (GEF) that activates p-Tyr42 RhoA. P-Tyr42 RhoA then bound to IκB kinase γ (IKKγ), leading IKKβ activation...
July 13, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28712304/regulation-of-cellular-redox-signaling-by-matricellular-proteins-in-vascular-biology-immunology-and-cancer
#20
David D Roberts, Sukhbir Kaur, Jeffrey S Isenberg
SIGNIFICANCE: In contrast to structural elements of the extracellular matrix, matricellular proteins appear transiently during development and injury responses, but their sustained expression can contribute to chronic disease. Through interactions with other matrix components and specific cell surface receptors matricellular proteins regulate multiple signaling pathways, including those mediated by reactive oxygen and nitrogen species and H2S. Dysregulation of matricellular proteins contributes to the pathogenesis of vascular diseases and cancer...
July 16, 2017: Antioxidants & Redox Signaling
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