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https://www.readbyqxmd.com/read/28045936/detoxification-of-mitochondrial-oxidants-and-apoptotic-signaling-are-facilitated-by-thioredoxin-2-and-peroxiredoxin-3-during-hyperoxic-injury
#1
Benjamin J Forred, Darwin R Daugaard, Brianna K Titus, Ryan R Wood, Miranda J Floen, Michelle L Booze, Peter F Vitiello
Mitochondria play a fundamental role in the regulation of cell death during accumulation of oxidants. High concentrations of atmospheric oxygen (hyperoxia), used clinically to treat tissue hypoxia in premature newborns, is known to elicit oxidative stress and mitochondrial injury to pulmonary epithelial cells. A consequence of oxidative stress in mitochondria is the accumulation of peroxides which are detoxified by the dedicated mitochondrial thioredoxin system. This system is comprised of the oxidoreductase activities of peroxiredoxin-3 (Prx3), thioredoxin-2 (Trx2), and thioredoxin reductase-2 (TrxR2)...
2017: PloS One
https://www.readbyqxmd.com/read/28043644/differential-expression-of-survival-proteins-during-decreased-intracellular-oxygen-tension-in-brain-endothelial-cells-of-grey-mullets
#2
Padmini Ekambaram, Meenakshi Narayanan, Parimala Parasuraman
The brain requires constant oxygen supply to perform its biological functions essential for survival. Because of low oxygen capacity and poor oxygen diffusibility of water, many fish species have evolved various adaptive mechanisms to cope with depleted oxygen. Endothelial cells (EC) are the primary components responsible for controlled environment of brain. Brain homeostasis largely depends on integrity of the EC. To elucidate their adaptive strategy, EC were isolated from the fish brain of Kovalam-control site and Ennore estuary-test/field hypoxic site and were subjected to low oxygen tension in laboratory...
December 30, 2016: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28040492/valproic-acid-and-ask1-deficiency-ameliorate-optic-neuritis-and-neurodegeneration-in-an-animal-model-of-multiple-sclerosis
#3
Yuriko Azuchi, Atsuko Kimura, Xiaoli Guo, Goichi Akiyama, Takahiko Noro, Chikako Harada, Atsuko Nishigaki, Kazuhiko Namekata, Takayuki Harada
Optic neuritis, which is an acute inflammatory demyelinating syndrome of the central nervous system, is one of the major complications in multiple sclerosis (MS). Herein, we investigated the therapeutic potential of valproic acid (VPA) on optic neuritis in experimental autoimmune encephalomyelitis (EAE), a mouse model of MS. EAE was induced in C57BL/6 mice by immunization with MOG35-55 and VPA (300mg/kg) was administered via intraperitoneal injection once daily from day 3 postimmunization until the end of the experimental period (day 28)...
December 28, 2016: Neuroscience Letters
https://www.readbyqxmd.com/read/28039481/phosphorylation-of-eb1-regulates-the-recruitment-of-clip-170-and-p150glued-to-the-plus-ends-of-astral-microtubules
#4
Jie Ran, Youguang Luo, Yijun Zhang, Yang Yang, Miao Chen, Min Liu, Dengwen Li, Jun Zhou
Phosphorylation of end-binding protein 1 (EB1), a key member of microtubule plus end-tracking proteins (+TIPs), by apoptosis signal-regulating kinase 1 (ASK1) has been demonstrated to promote the stability of astral microtubules during mitosis by stimulating the binding of EB1 to microtubule plus ends. However, the roles of other members of the +TIPs family in ASK1/EB1-mediated regulation of astral microtubules are unknown. Herein, we show that ASK1-mediated phosphorylation of EB1 enhances the localization of cytoplasmic linker protein 170 (CLIP-170) and p150glued to the plus ends of astral microtubules...
December 25, 2016: Oncotarget
https://www.readbyqxmd.com/read/28031524/adenosine-5-monophosphate-blocks-acetaminophen-toxicity-by-increasing-ubiquitination-mediated-ask1-degradation
#5
Xiao Yang, Yibei Zhan, Qi Sun, Xi Xu, Yi Kong, Jianfa Zhang
Acetaminophen (APAP) overdose is the most frequent cause of drug-induced liver failure in the world. Hepatic c-jun NH2-terminal protein kinase (JNK) activation is thought to be a consequence of oxidative stress produced during APAP metabolism. Activation of JNK signals causes hepatocellular damage with necrotic and apoptotic cell death. Here we found that APAP caused a feedback increase in plasma adenosine 5'-monophsphate (5'-AMP). We demonstrated that co-administration of APAP and 5'-AMP significantly ameliorated APAP-induced hepatotoxicity in mice, without influences on APAP metabolism and its analgesic function...
December 21, 2016: Oncotarget
https://www.readbyqxmd.com/read/28028021/ask1-regulates-platelet-granule-secretion-thromboxane-a2-generation-and-thrombus-formation-in-mice
#6
Meghna U Naik, Pravin Patel, Randall Derstine, Ramya Turaga, Xi Chen, Kalyan Golla, Keith B Neeves, Hidenori Ichijo, Ulhas P Naik
Mitogen activated protein kinases (MAPKs) are expressed in platelets and are activated downstream of physiological agonists. Pharmacological and genetic evidence indicate that MAPKs play a significant role in hemostasis and thrombosis, but it is not well understood how MAPKs are activated upon platelet stimulation. Here, we show that Apoptosis Signal-regulating Kinase 1 (ASK1), a member of the MAP3K family, is expressed in both human and murine platelets. ASK1 is rapidly and robustly activated upon platelet stimulation by physiological agonists...
December 27, 2016: Blood
https://www.readbyqxmd.com/read/27989136/dynamic-phosphorylation-of-apoptosis-signal-regulating-kinase-1-ask1-in-response-to-oxidative-and-electrophilic-stress
#7
Carlos Morales Betanzos, Joel D Federspiel, Amy M Palubinsky, BethAnn McLaughlin, Daniel C Liebler
Apoptosis signal-regulating kinase 1 (ASK1) is a critical cellular stress sensor that senses diverse reactive chemotypes and integrates these chemical signals into a single biological pathway response. It is unknown whether ASK1 senses all stressors in the same way or if unique stress-specific mechanisms detect distinct chemotypes. In order to answer this question, we treated ASK1-expressing cells with two distinct stress activators, H2O2 and 4-hydroxy-2-nonenal (HNE), and monitored the phosphorylation state of ASK1...
December 19, 2016: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/27942664/phenolics-extracted-from-tartary-fagopyrum-tartaricum-l-gaerth-buckwheat-bran-exhibit-antioxidant-activity-and-an-antiproliferative-effect-on-human-breast-cancer-mda-mb-231-cells-through-the-p38-map-kinase-pathway
#8
Fuhua Li, Xiaoli Zhang, Yao Li, Keke Lu, Ran Yin, Jian Ming
Phenolics extracted from tartary buckwheat (Fagopyrum tartaricum L. Gaerth) bran were analyzed quantitatively and qualitatively. The bioactivity of the phenolic extracts was evaluated, such as the antioxidant activity, and the inhibition capacity on the growth of cancer cells. The molecular mechanism for the inhibitive effect on cancer cells was explored. Results indicated that tartary buckwheat bran phenolics mainly exist in a free form, and free phenolics were twice as abundant as bound phenolics. Free caffeic acid (119...
December 12, 2016: Food & Function
https://www.readbyqxmd.com/read/27932980/tnf-%C3%AE-induced-cpla2-expression-via-nadph-oxidase-reactive-oxygen-species-dependent-nf-%C3%AE%C2%BAb-cascade-on-human-pulmonary-alveolar-epithelial-cells
#9
Chih-Chung Lin, Wei-Ning Lin, Rou-Ling Cho, Chen-Yu Wang, Li-Der Hsiao, Chuen-Mao Yang
Tumor necrosis factor-α (TNF-α) triggers activation of cytosolic phospholipase A2 (cPLA2) and then enhancing the synthesis of prostaglandin (PG) in inflammatory diseases. However, the detailed mechanisms of TNF-α induced cPLA2 expression were not fully defined in human pulmonary alveolar epithelial cells (HPAEpiCs). We found that TNF-α-stimulated increases in cPLA2 mRNA (5.2 folds) and protein (3.9 folds) expression, promoter activity (4.3 folds), and PGE2 secretion (4.7 folds) in HPAEpiCs, determined by Western blot, real-time PCR, promoter activity assay and PGE2 ELISA kit...
2016: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/27890558/ask1-regulates-the-survival-of-neuroblastoma-cells-by-interacting-with-tlx-and-stabilizing-hif-1%C3%AE
#10
Praveen K Sobhan, Qiwei Zhai, Lydia C Green, Loen M Hansford, Keiko Funa
Elevated expression of TLX (also called as NR2E1) in neuroblastoma (NB) correlates with unfavorable prognosis, and TLX is required for self-renewal of NB cells. Knockdown of TLX has been shown to reduce the NB sphere-forming ability. ASK1 (MAP3K5) and TLX expression are both enhanced in SP (side population) NB and patient-derived primary NB sphere cell lines, but the majority of non-SP NB lines express lower ASK1 expression. We found that ASK1 phosphorylated and stabilized TLX, which led induction of HIF-1α, and its downstream VEGF-A in an Akt dependent manner...
January 2017: Cellular Signalling
https://www.readbyqxmd.com/read/27869172/a-redox-state-dictated-signalling-pathway-deciphers-the-malignant-cell-specificity-of-cd40-mediated-apoptosis
#11
C J Dunnill, K Ibraheem, A Mohamed, J Southgate, N T Georgopoulos
CD40, a member of the tumour necrosis factor receptor (TNFR) superfamily, has the capacity to cause extensive apoptosis in carcinoma cells, while sparing normal epithelial cells. Yet, apoptosis is only achieved by membrane-presented CD40 ligand (mCD40L), as soluble receptor agonists are but weakly pro-apoptotic. Here, for the first time we have identified the precise signalling cascade underpinning mCD40L-mediated death as involving sequential TRAF3 stabilisation, ASK1 phosphorylation, MKK4 (but not MKK7) activation and JNK/AP-1 induction, leading to a Bak- and Bax-dependent mitochondrial apoptosis pathway...
November 21, 2016: Oncogene
https://www.readbyqxmd.com/read/27858941/block-one-unleash-a-hundred-mechanisms-of-dab2ip-inactivation-in-cancer
#12
REVIEW
Arianna Bellazzo, Giulio Di Minin, Licio Collavin
One of the most defining features of cancer is aberrant cell communication; therefore, a molecular understanding of the intricate network established among tumor cells and their microenvironment could significantly improve comprehension and clinical management of cancer. The tumor suppressor DAB2IP (Disabled homolog 2 interacting protein), also known as AIP1 (ASK1 interacting protein), has an important role in this context, as it modulates signal transduction by multiple inflammatory cytokines and growth factors...
January 2017: Cell Death and Differentiation
https://www.readbyqxmd.com/read/27826954/critical-and-diverse-in-vivo-roles-of-apoptosis-signal-regulating-kinase-1-in-animal-models-of-atherosclerosis-and-cholestatic-liver-injury
#13
REVIEW
Sohsuke Yamada, Hirotsugu Noguchi, Akihide Tanimoto
Apoptosis plays pivotal in vivo roles in not only vital processes, such as cell turnover and embryonic development, but also various inflammatory disorders. However, the role of apoptosis by vascular and hepatic cells in the respective progression of atherosclerosis and liver injury remains controversial. Apoptosis signal-regulating kinase 1 (ASK1) is a mitogen-activated protein kinase kinase kinase family member that is activated through distinct mechanisms in response to various cytotoxic stressors. ASK1, ubiquitously expressed, is situated in an important upstream position for many signal transduction pathways, which subsequently induce inflammation and/or apoptosis...
November 9, 2016: Histology and Histopathology
https://www.readbyqxmd.com/read/27825085/akt2-inhibition-of-cisplatin-induced-jnk-p38-and-bax-activation-by-phosphorylation-of-ask1-implication-of-akt2-in-chemoresistance
#14
Zeng-Qiang Yuan, Richard I Feldman, Gene E Sussman, Domenico Coppola, Santo V Nicosia, Jin Q Cheng
No abstract text is available yet for this article.
October 21, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27787596/overexpression-of-psk1-a-skp1-like-gene-homologue-from-paeonia-suffruticosa-confers-salinity-tolerance-in-arabidopsis
#15
Qing Hao, Hongxu Ren, Jin Zhu, Liangsheng Wang, Shouchen Huang, Zheng'an Liu, Zhimin Gao, Qingyan Shu
Our study is the first to demonstrate that PSK1 , a SKP1 -like gene homologue, is involved in salinity tolerance. Our functional characterization of PSK1 provides new insights into tree peony development. A homologous gene of S-phase kinase-associated protein1 (SKP1) was cloned from tree peony (Paeonia suffruticosa) and denoted as PSK1. The 462-bp open reading frame of PSK1 was predicted to encode a protein comprising 153 amino acids, with a molecular mass of 17 kDa. The full-length gene was 1,634 bp long and included a large 904-bp intron...
January 2017: Plant Cell Reports
https://www.readbyqxmd.com/read/27785931/role-of-glutathione-s-transferases-in-neurological-problems
#16
Anil Kumar, Dinesh K Dhull, Varun Gupta, Priyanka Channana, Arti Singh, Manveen Bhardwaj, Poonam Ruhal, Ruchika Mittal
Role of Glutathione-S-transferases (GSTs) has been well explored in the cellular detoxification process, regulation of redox homeostasis and S-glutothionylation of target proteins like JNK, ASK1 etc. However, altered levels or functions of this enzyme or their subtypes have emerged in the development of several pathologies diseases such as Alzheimer's disease, Parkinson's disease, cancer and related conditions. Oxidative stress is one of the possible pathological events that contributes significantly to activation of degenerating cascades inside neuronal cells...
October 27, 2016: Expert Opinion on Therapeutic Patents
https://www.readbyqxmd.com/read/27775615/microrna-mediated-down-regulation-of-apoptosis-signal-regulating-kinase-1-ask1-attenuates-the-apoptosis-of-human-mesenchymal-stem-cells-mscs-transplanted-into-infarcted-heart
#17
Chang Youn Lee, Sunhye Shin, Jiyun Lee, Hyang-Hee Seo, Kyu Hee Lim, Hyemin Kim, Jung-Won Choi, Sang Woo Kim, Seahyung Lee, Soyeon Lim, Ki-Chul Hwang
Stem cell therapy using adult stem cells, such as mesenchymal stem cells (MSCs) has produced some promising results in treating the damaged heart. However, the low survival rate of MSCs after transplantation is still one of the crucial factors that limit the therapeutic effect of stem cells. In the damaged heart, oxidative stress due to reactive oxygen species (ROS) production can cause the death of transplanted MSCs. Apoptosis signal-regulating kinase 1 (ASK1) has been implicated in the development of oxidative stress-related pathologic conditions...
October 20, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27762484/non-hemolytic-enterotoxin-of-bacillus-cereus-induces-apoptosis-in-vero-cells
#18
Xiaoye Liu, Shuangyang Ding, Peijie Shi, Richard Dietrich, Erwin Märtlbauer, Kui Zhu
Bacillus cereus is an opportunistic pathogen that often causes foodborne infectious diseases and food poisoning. Non-hemolytic enterotoxin (Nhe) is the major toxin found in almost all enteropathogenic B. cereus and B. thuringiensis isolates. However, little is known about the cellular response after Nhe triggered pore formation on cell membrane. Here, we demonstrate that Nhe induced cell cycle arrest at G0 /G1 phase and provoked apoptosis in Vero cells, most likely associated with mitogen-activated protein kinase (MAPK) and death receptor pathways...
October 20, 2016: Cellular Microbiology
https://www.readbyqxmd.com/read/27746696/induction-of-nrf2-are-mediated-cytoprotective-genes-by-red-ginseng-oil-through-ask1-mkk4-7-jnk-and-p38-mapk-signaling-pathways-in-hepg2-cells
#19
Min Ji Bak, Van-Long Truong, Se-Yeon Ko, Xuan Ngan Giang Nguyen, Mira Jun, Soon-Gi Hong, Jong-Won Lee, Woo-Sik Jeong
BACKGROUND: The induction of cellular defensive genes such as phase II detoxifying and antioxidant enzymes is a highly effective strategy for protection against carcinogenesis as well as slowing cancer development. Transcription factor Nrf2 (nuclear factor E2-related factor 2) is responsible for activation of phase II enzymes induced by natural chemopreventive compounds. METHODS: Red ginseng oil (RGO) was extracted using a supercritical CO2 extraction system and chemical profile of RGO was investigated by GC/MS...
October 2016: Journal of Ginseng Research
https://www.readbyqxmd.com/read/27741419/endophilin-a2-mediated-increase-in-scavenger-receptor-expression-contributes-to-macrophage-derived-foam-cell-formation
#20
Er-Wen Huang, Can-Zhao Liu, Si-Jia Liang, Zheng Zhang, Xiao-Fei Lv, Jie Liu, Jia-Guo Zhou, Yong-Bo Tang, Yong-Yuan Guan
BACKGROUND AND AIMS: Macrophage-derived foam cell formation (MFCF) is a crucial step in the pathogenesis of atherosclerosis. Uptake of oxidized low-density lipoprotein (oxLDL) by scavenger receptors is indispensable for MFCF. Endophilin-A2 has been reported to regulate clathrin-mediated endocytosis (CME). In this study, we tested the hypothesis that endophilin-A2 regulates oxLDL uptake and MFCF by mediating CME of oxLDL-scavenger receptor complexes. METHODS: In vitro MFCF was induced by oxLDL treatment...
October 6, 2016: Atherosclerosis
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