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okadaic acid

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https://www.readbyqxmd.com/read/28090315/chronic-mucocutaneous-candidiasis-disease-associated-with-inborn-errors-of-il-17-immunity
#1
REVIEW
Satoshi Okada, Anne Puel, Jean-Laurent Casanova, Masao Kobayashi
Chronic mucocutaneous candidiasis (CMC) is characterized by recurrent or persistent infections affecting the nails, skin and oral and genital mucosae caused by Candida spp., mainly Candida albicans. CMC is an infectious phenotype in patients with inherited or acquired T-cell deficiency. Patients with autosomal-dominant (AD) hyper IgE syndrome (HIES), AD signal transducer and activator of transcription 1 (STAT1) gain-of-function, autosomal-recessive (AR) deficiencies in interleukin (IL)-12 receptor β1 (IL-12Rβ1), IL-12p40, caspase recruitment domain-containing protein 9 (CARD9) or retinoic acid-related orphan receptor γT (RORγT) or AR autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy (APECED) develop CMC as a major infectious phenotype that is categorized as Syndromic CMC...
December 2016: Clinical & Translational Immunology
https://www.readbyqxmd.com/read/28089692/in-vitro-bioaccessibility-of-the-marine-biotoxins-okadaic-acid-dinophysistoxin-2-and-their-7-o-acyl-fatty-acid-ester-derivatives-in-raw-and-steamed-shellfish
#2
Diana Manita, Ricardo N Alves, Ana Catarina Braga, Fabiola Fogaça, António Marques, Pedro Reis Costa
Okadaic acid (OA), Dinophysistoxins (DTX1 and DTX2) and their acyl-derivatives (DTX3) are marine toxins responsible for the human diarrhetic shellfish poisoning. To date the amount of toxins ingested from consumption of shellfish has been considered equal to the amount of toxins available for uptake by the human body. The aim of this study is to assess the OA, DTX2 and DTX3 fractions released from raw and steamed mussels and cockles into the digestive fluids (bioaccessibility) using a static in vitro digestion model...
January 12, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28073524/distribution-occurrence-and-biotoxin-composition-of-the-main-shellfish-toxin-producing-microalgae-within-european-waters-a-comparison-of-methods-of-analysis
#3
Sara E McNamee, Linda K Medlin, Jessica Kegel, Gary R McCoy, Robin Raine, Lucia Barra, Maria Valeria Ruggiero, Wiebe H C F Kooistra, Marina Montresor, Johannes Hagstrom, Eva Perez Blanco, Edna Graneli, Francisco Rodríguez, Laura Escalera, Beatriz Reguera, Simon Dittami, Bente Edvardsen, Joe Taylor, Jane M Lewis, Yolanda Pazos, Christopher T Elliott, Katrina Campbell
Harmful algal blooms (HABs) are a natural global phenomena emerging in severity and extent. Incidents have many economic, ecological and human health impacts. Monitoring and providing early warning of toxic HABs are critical for protecting public health. Current monitoring programmes include measuring the number of toxic phytoplankton cells in the water and biotoxin levels in shellfish tissue. As these efforts are demanding and labour intensive, methods which improve the efficiency are essential. This study compares the utilisation of a multitoxin surface plasmon resonance (multitoxin SPR) biosensor with enzyme-linked immunosorbent assay (ELISA) and analytical methods such as high performance liquid chromatography with fluorescence detection (HPLC-FLD) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) for toxic HAB monitoring efforts in Europe...
May 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073509/harmful-effects-of-dinophysis-to-the-ciliate-mesodinium-rubrum-implications-for-prey-capture
#4
Luiz L Mafra, Satoshi Nagai, Hajime Uchida, Camila P S Tavares, Bruno P Escobar, Toshiyuki Suzuki
Toxigenic Dinophysis spp. are obligate mixotrophic dinoflagellates that require a constant supply of prey-Mesodinium rubrum-to achieve long-term growth by means of kleptoplasty. Mesodinium rubrum is, however, a fast moving, jumping ciliate exhibiting an effective escape response from suspensivorous predators. In the present study, a series of laboratory experiments evaluating the motility and survival of M. rubrum in the presence of Dinophysis cells and/or substances contained in their culture medium was designed, in order to assess the mechanisms involved in prey capture by Dinophysis spp...
November 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073504/distribution-of-dinophysis-species-and-their-association-with-lipophilic-phycotoxins-in-plankton-from-the-argentine-sea
#5
Elena Fabro, Gastón O Almandoz, Martha Ferrario, Urban Tillmann, Allan Cembella, Bernd Krock
Dinophysis is a cosmopolitan genus of marine dinoflagellates, considered as the major proximal source of diarrheic shellfish toxins and the only producer of pectenotoxins (PTX). From three oceanographic expeditions carried out during autumn, spring and late summer along the Argentine Sea (∼38-56°S), lipophilic phycotoxins were determined by liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) in size-fractionated plankton samples. Lipophilic toxin profiles were associated with species composition by microscopic analyses of toxigenic phytoplankton...
November 2016: Harmful Algae
https://www.readbyqxmd.com/read/28068557/cordycepin-inhibits-migration-of-human-glioblastoma-cells-by-affecting-lysosomal-degradation-and-protein-phosphatase-activation
#6
Dueng-Yuan Hueng, Ching-Hsuan Hsieh, Yu-Chen Cheng, Wen-Chiuan Tsai, Ying Chen
Cordycepin, a nucleoside-derivative-isolated form Cordyceps militaris, has been reported to suppress tumor cell proliferation and cause apoptosis. This study investigates the effect of cordycepin on the migration of human glioblastoma cells. Cordycepin suppressed the migration of the human glioblastoma cell lines U87MG and LN229 in transwell and wound healing assays. Cordycepin decreased protein expression of integrin α1, focal adhesion kinase (FAK), p-FAK, paxillin and p-paxillin. The lysosomal inhibitor NH4Cl blocked the ability of cordycepin to inhibit focal adhesion protein expression and glioma cell migration...
December 29, 2016: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28067270/osmyc2-an-essential-factor-for-ja-inductive-sakuranetin-production-in-rice-interacts-with-myc2-like-proteins-that-enhance-its-transactivation-ability
#7
Satoshi Ogawa, Koji Miyamoto, Keiichirou Nemoto, Tatsuya Sawasaki, Hisakazu Yamane, Hideaki Nojiri, Kazunori Okada
Biosynthesis of sakuranetin, a flavonoid anti-fungal phytoalexin that occurs in rice, is highly dependent on jasmonic acid (JA) signalling and induced by a variety of environmental stimuli. We previously identified OsNOMT, which encodes naringenin 7-O-methyltransferase (NOMT); NOMT is a key enzyme for sakuranetin production. Although OsNOMT expression is induced by JA treatment, the regulation mechanism that activates the biosynthetic pathway of sakuranetin has not yet been elucidated. In this study, we show that JA-inducible basic helix-loop-helix transcriptional factor OsMYC2 drastically enhances the activity of the OsNOMT promoter and is essential for JA-inducible sakuranetin production...
January 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28030862/a-comparative-study-of-a-new-class-of-gastric-acid-suppressant-agent-named-vonoparazan-versus-esomeprazole-for-the-eradication-of-helicobacter-pylori
#8
Masahiro Tsujimae, Hiroshi Yamashita, Hiroki Hashimura, Chise Kano, Keiko Shimoyama, Atsushi Kanamori, Kei Matsumoto, Akio Koizumi, Kenji Momose, Takaaki Eguchi, Takumi Fukuchi, Mikio Fujita, Akihiko Okada
BACKGROUND: Helicobacter pylori eradication rates have decreased worldwide. Gastric acid inhibition during treatment is important to eradicate these bacteria successfully. A new potassium-competitive acid blocker, vonoprazan (VPZ), has been shown to achieve high eradication rates in a previous randomized controlled trial. OBJECTIVE: To determine the efficacy of VPZ for H. pylori eradication. METHODS: A total of 874 patients were enrolled; 431 received esomeprazole (EPZ) and 443 received VPZ...
2016: Digestion
https://www.readbyqxmd.com/read/28027514/egfr-independent-elk1-cip2a-signalling-mediates-apoptotic-effect-of-an-erlotinib-derivative-td52-in-triple-negative-breast-cancer-cells
#9
Chun-Yu Liu, Tzu-Ting Huang, Chun-Teng Huang, Ming-Hung Hu, Duen-Shian Wang, Wan-Lun Wang, Wen-Chun Tsai, Chia-Han Lee, Ka-Yi Lau, Hsiu-Ping Yang, Ming-Huang Chen, Chung-Wai Shiau, Ling-Ming Tseng, Kuen-Feng Chen
OBJECTIVES: Cancerous inhibitor of protein phosphatase 2A (CIP2A) has emerged as a therapeutic determinant mediating the anti-cancer effects of several new agents. We investigated the efficacy and mechanism of TD52, an erlotinib derivative with minimal p-EGFR inhibition but significant CIP2A downregulation, in triple-negative breast cancer (TNBC) cells. METHODS: TNBC lines were used for in vitro studies. Cell apoptosis was examined by flow cytometry and Western blot...
December 24, 2016: European Journal of Cancer
https://www.readbyqxmd.com/read/28011069/alanine-scanning-mutagenesis-of-human-signal-transducer-and-activator-of-transcription-1-to-estimate-loss-or-gain-of-function-variants
#10
Reiko Kagawa, Ryoji Fujiki, Miyuki Tsumura, Sonoko Sakata, Shiho Nishimura, Yuval Itan, Xiao-Fei Kong, Zenichiro Kato, Hidenori Ohnishi, Osamu Hirata, Satoshi Saito, Maiko Ikeda, Jamila El Baghdadi, Aziz Bousfiha, Kaori Fujiwara, Matias Oleastro, Judith Yancoski, Laura Perez, Silvia Danielian, Fatima Ailal, Hidetoshi Takada, Toshiro Hara, Anne Puel, Stéphanie Boisson-Dupuis, Jacinta Bustamante, Jean-Laurent Casanova, Osamu Ohara, Satoshi Okada, Masao Kobayashi
BACKGROUND: Germline heterozygous mutations in human signal transducer and activator of transcription 1 (STAT1) can cause loss of function (LOF), as in patients with Mendelian susceptibility to mycobacterial diseases, or gain of function (GOF), as in patients with chronic mucocutaneous candidiasis. LOF and GOF mutations are equally rare and can affect the same domains of STAT1, especially the coiled-coil domain (CCD) and DNA-binding domain (DBD). Moreover, 6% of patients with chronic mucocutaneous candidiasis with a GOF STAT1 mutation have mycobacterial disease, obscuring the functional significance of the identified STAT1 mutations...
December 14, 2016: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28003434/gene-cloning-recombinant-expression-purification-and-characterization-of-l-methionine-decarboxylase-from-streptomyces-sp-590
#11
Masaya Hayashi, Akane Okada, Kumiko Yamamoto, Tomomi Okugochi, Chika Kusaka, Daizou Kudou, Michiko Nemoto, Junko Inagaki, Yuu Hirose, Toshihide Okajima, Takashi Tamura, Kenji Soda, Kenji Inagaki
l-Methionine decarboxylase (MetDC) from Streptomyces sp. 590 depends on pyridoxal 5'-phosphate and catalyzes the non-oxidative decarboxylation of l-methionine to produce 3-methylthiopropylamine and carbon dioxide. MetDC gene (mdc) was determined to consist of 1,674 bp encoding 557 amino acids, and the amino acid sequence is similar to that of l-histidine decarboxylases and l-valine decarboxylases from Streptomyces sp. strains. The mdc gene was cloned and recombinant MetDC was heterologously expressed by Escherichia coli The purification of recombinant MetDC was carried out by DEAE-Toyopearl and Ni-NTA agarose column chromatography...
December 21, 2016: Journal of Biochemistry
https://www.readbyqxmd.com/read/27998769/passive-immunization-targeting-the-n-terminal-region-of-phosphorylated-tau-residues-68-71-improves-spatial-memory-in-okadaic-acid-induced-tauopathy-model-rats
#12
Sarada Subramanian, Ganesh Savanur, Sowmya Madhavadas
Alzheimer's disease (AD) is the leading cause of dementia, characterized by progressive loss of memory and other cognitive functions. The cognitive impairment in patients with AD is closely associated with loss of synapses and the formation of neurofibrillary tangles (NFT) containing hyperphosphorylated tau in the hippocampus. Effective treatment for AD is still not available. In this study, the sequence comprising of residues 50-71 in the N-terminal region of tau, containing theoretically predicted B- and T-cell epitopes in close proximity to pathologically relevant phospho-serine (residue 68) and phospho-threonine (residues 69, 71) was selected as a potential immunotherapeutic peptide...
December 18, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27989117/hplc-separation-of-sulforaphane-enantiomers-in-broccoli-and-its-sprouts-by-transformation-into-diastereoisomers-using-derivatization-with-s-leucine
#13
Makiko Okada, Atsushi Yamamoto, Sen-Ichi Aizawa, Atsushi Taga, Hiroyuki Terashima, Shuji Kodama
Racemic sulforaphane, which was derivatized with (S)-leucine (l-leucine), was resolved by reversed phase HPLC with UV detection. The optimum mobile phase conditions were found to be 10 mM citric acid (pH 2.8) containing 22% methanol at 35 °C using detection at 254 nm. Sulforaphane enantiomers in florets and stems of five brands of broccoli and leaves and stems of three brands of broccoli sprouts were analyzed by the proposed HPLC method. Both sulforaphane enantiomers were detected in all of the samples. The S/R ratios of sulforaphane in broccoli samples were 1...
December 27, 2016: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27959783/human-cytomegalovirus-phosphoproteins-are-hypophosphorylated-and-intrinsically-disordered
#14
Franz Jj Rieder, Marie-Theres Kastner, Markus Hartl, Martin G Puchinger, Martina Schneider, Otto Majdic, William J Britt, Kristina Djinović-Carugo, Christoph Steininger
Protein phosphorylation has important regulatory functions in cell homeostasis and is tightly regulated by kinases and phosphatases. The tegument of human cytomegalovirus (CMV) contains several proteins that are reported to be extensively phosphorylated but also cellular protein phosphatases (PP1 & PP2A). To investigate this apparent inconsistency, we evaluated the phosphorylation status of the tegument proteins pUL32 and pp65 by enzymatic dephosphorylation and mass spectrometry. Enzymatic dephosphorylation with bacterial λ phosphatase, but not with PP1, shifted the pUL32-specific signal on reducing SDS-PAGE from ~150 kDa to ~148 kDa, a mass that was still much larger than the ~118 kDa obtained from our diffusion studies and from the calculated protein mass of ~113 kDa...
December 13, 2016: Journal of General Virology
https://www.readbyqxmd.com/read/27956244/sublethal-doses-of-dinophysistoxin-1-and-okadaic-acid-stimulate-secretion-of-inflammatory-factors-on-innate-immune-cells-negative-health-consequences
#15
Miguel Del Campo, Ta-Ying Zhong, Ricardo Tampe, Lorena García, Néstor Lagos
One of the proposed mechanisms to explain why Diarrhetic Shellfish Poison (DSP) toxins are tumor promoters is founded on the capacity of these toxins to increase TNF-α secretion. Although macrophages are the principal cells in the activation of the inflammatory response, the immune profile that Okadaic acid (OA) and Dinophysistoxin-1 (DTX-1) trigger in these cells has not been fully explored. We have therefore investigated the effect of various concentrations of both toxins on the activity of several inflammatory factors...
December 9, 2016: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/27934678/incidence-of-hepatitis-b-virus-reactivation-in-patients-with-resolved-infection-on-immunosuppressive-therapy-for-rheumatic-disease-a-multicentre-prospective-observational-study-in-japan
#16
Wataru Fukuda, Tadamasa Hanyu, Masaki Katayama, Shinichi Mizuki, Akitomo Okada, Masayuki Miyata, Yuichi Handa, Masatoshi Hayashi, Yoshinobu Koyama, Kaoru Arii, Toshiyuki Kitaori, Hiroyuki Hagiyama, Yoshinori Urushidani, Takahito Yamasaki, Yoshihiko Ikeno, Tsuyoshi Suzuki, Atsushi Omoto, Toshifumi Sugitani, Satoshi Morita, Shigeko Inokuma
BACKGROUND: Although the reactivation of hepatitis B virus (HBV) is recognised as a serious complication in patients with rheumatic disease (RD) receiving immunosuppressive drugs (ISDs), the incidence and risk factors for reactivation remain controversial. OBJECTIVES: To investigate the incidence and risk factors for HBV reactivation in patients with RD. METHODS: We performed a multicentre, observational, prospective study over 2 years in patients with resolved HBV infection...
December 1, 2016: Annals of the Rheumatic Diseases
https://www.readbyqxmd.com/read/27918433/protein-phosphatase-1-regulates-expression-of-neuregulin-1
#17
Tatiana Ammosova, Kareem Washington, Jamie Rotimi, Namita Kumari, Kahli A Smith, Xiaomei Niu, Marina Jerebtsova, Sergei Nekhai
Protein phosphatase 1 (PP1), a cellular serine/threonine phosphatase, is targeted to cellular promoters by its major regulatory subunits, PP1 nuclear targeting subunit, nuclear inhibitor of PP1 (NIPP1) and RepoMan. PP1 is also targeted to RNA polymerase II (RNAPII) by NIPP1 where it can dephosphorylate RNAPII and cycle-dependent kinase 9 (CDK9). Here, we show that treatment of cells with a small molecule activator of PP1 increases the abundance of a neuregulin-1 (NRG-1)-derived peptide. NRG-1 mRNA and protein levels were increased in the cells stably or transiently expressing mutant NIPP1 (mNIPP1) that does not bind PP1, but not in the cells expressing NIPP1...
December 2, 2016: Biology
https://www.readbyqxmd.com/read/27916773/a-case-of-unresectable-combined-hepatocellular-cholangiocarcinoma-showing-favorable-response-to-lfp-therapy
#18
Sayuri Kato, Yasuto Takeuchi, Nozomu Wada, Yuuki Morimoto, Kenji Kuwaki, Hideki Ohnishi, Shinichiro Nakamura, Hidenori Shiraha, Akinobu Takaki, Hiroyuki Okada
A woman in her 50s was admitted to our hospital because of multiple tumors detected in her liver. She was diagnosed with combined hepatocellular cholangiocarcinoma using gadolinium-ethoxybenzyl-diethylenetriamine pentaacetic acid (Gd-EOB-DTPA)-enhanced magnetic resonance imaging (MRI) and biopsy of the liver tumors. We judged the tumors to be unresectable because they were found in both lobes of the liver, with a tumor thrombus being found in the main left portal vein. The pathological findings showed that the tumors exhibited characteristics of hepatocellular carcinoma...
2016: Nihon Shokakibyo Gakkai Zasshi, the Japanese Journal of Gastro-enterology
https://www.readbyqxmd.com/read/27914953/both-secreted-and-the-cellular-levels-of-bdnf-attenuated-due-to-tau-hyperphosphorylation-in-primary-cultures-of-cortical-neurons
#19
İrem Lütfiye Atasoy, Erdinç Dursun, Duygu Gezen-Ak, Derya Metin-Armağan, Melek Öztürk, Selma Yılmazer
Intracellular aggregation of hyperphosphorylated tau in neurofibrillary tangles (NFTs) is a major neuropathological hallmark of taupathies such as Alzheimer's disease. Okadaic acid (OKA) is a potent inhibitor of PP2A, leading to abnormal tau phosphorylation. Brain-derived neurotrophic factor (BDNF) is a neurotrophin that is selectively downregulated in AD. In this study, we investigated the effects of OKA induced tau hyperphosphorylation on secreted and cellular levels of BDNF in primary cortical neurons that were treated with 25nM OKA...
November 30, 2016: Journal of Chemical Neuroanatomy
https://www.readbyqxmd.com/read/27914518/delta-6-desaturase-activity-during-the-first-year-of-life-in-preterm-infants
#20
Nobuhiko Nagano, Tomoo Okada, Kazunori Kayama, Shigeharu Hosono, Yohei Kitamura, Shigeru Takahashi
Term neonates have high delta-6 desaturase (D6D) activity, which is important for regulating polyunsaturated fatty acid's (PUFA) nutritional status. The aim was to investigate D6D activity in preterm infants and its postnatal changes. Forty-three appropriate-for-gestational-age infants were included. PUFA in red blood cells was analyzed at birth and at one, six, and 12 months of age. D6D activity was estimated by 20:3n-6/18:2n-6 ratio. At birth, preterm infants had D6D activity as high as that of term infants; D6D activity declined to about one-third at one month, then further decreased to about one-sixth at six months and remained stable until 12 months...
December 2016: Prostaglandins, Leukotrienes, and Essential Fatty Acids
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