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Hundreds post-translational modifications (PTM) were characterized among which a large variety of glycosylations including O-GlcNAcylation. Since its discovery, O-GlcNAcylation has emerged as an unavoidable PTM widespread in the living beings including animal and plant cells, protists, bacteria and viruses. In opposition to N- and O-glycosylations, O-GlcNAcylation only consists in the transfer of a single N-acetylglucosamine moiety through a beta-linkage onto serine and threonine residues of proteins confined within the cytosol, the nucleus and the mitochondria. The O-GlcNAc group is provided by UDP-GlcNAc, the end-product of the hexosamine biosynthetic pathway located at the crossroad of cell metabolisms making O-GlcNAcylation a PTM which level tightly reflects nutritional status; therefore regulation of cell homeostasis should be intimately correlated to lifestyle and environment. Like phosphorylation, with which it can compete, O-GlcNAcylation is reversible. This versatility is managed by OGT (O-GlcNAc transferase) that transfers the GlcNAc group and OGA (O-GlcNAcase) that removes it. Also, like its unsweetened counterpart, O-GlcNAcylation controls fundamental processes, e.g. protein fate, chromatin topology, DNA demethylation and, as recently revealed, circadian clock. Deregulation of O-GlcNAc dynamism may be involved in the emergence of cancers, neuronal and metabolic disorders such as Alzheimer's or diabetes respectively. This Research Topic in Frontiers in Endocrinology is the opportunity to celebrate the thirtieth anniversary of the discovery of "O-GlcNAc" by Gerald W. Hart.

Cell signalling --- Metabolism --- Anabolism --- Catabolism --- Metabolism, Primary --- Primary metabolism --- Biochemistry --- Physiology --- nutrition --- Hexosamine biosynthetic pathway --- O GlcNAcylation --- OGA --- Inflammation --- OGT --- Cell signaling --- epigenetics --- Cancer

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Mycotoxins are a Public Health concern that in last year have reached the top 10 food and product hazard categories in the Rapid Alert System for Food and Feed (RASFF), with almost six hundred notifications. The toxicological effects of mycotoxins are evaluated through the extrapolation of results from in vivo and in vitro assays. Studies of mycotoxins’ effects at the cellular level precede those in organs and systems. All these studies are key steps for risk assessment and following legislation for mycotoxins. This Special Issue of Toxins comprises 10 original contributions and two reviews. The Issue reports new findings regarding toxic mechanisms, the use of innovative techniques to study the potential toxicity of mycotoxins not only individually but in combination, reflecting a real scenario according to current studies of mycotoxins.

Medicine --- Destruxin A --- Bombyx mori --- binding protein --- BmTudor-sn --- Bm12 cell --- Ochratoxin A (OTA) --- human Stem Cells --- mycotoxins --- cells --- cytotoxicity --- cell culture --- T-2 toxin --- HT-2 toxin --- apoptosis --- autophagy --- endophyte --- fungi --- neurotoxin --- lolitrems --- ochratoxin A --- beauvericin --- mixtures --- HepG2 cells --- genotoxicity --- cell cycle --- Fusarium --- Aspergillus --- Penicillium --- Alternaria --- emerging mycotoxin --- in vitro --- IPEC-J2 --- occurrence data --- trichothecene --- biosynthetic pathway --- acetyltransferase --- deacetylase --- deoxynivalenol --- 3-acetyldeoxynivalenol --- isotrichodermol --- isotrichodermin --- differentiated Caco-2 cells --- cell apoptosis --- transcriptome analysis --- hepatocyte --- chicken --- acute toxicity --- combined toxicity --- cell protection --- silibinin --- in silico prediction --- co-culture models --- mycotoxin interaction --- Loewe additivity --- combination index --- isobologram --- Chou-Talalay method --- MixLow --- IPEC-J2 cells --- RNA-seq --- inflammation --- MAPKs --- n/a --- Medicine.

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This Book of Toxins comprises 11 original contributions and one review. New findings regarding presence of mycotoxins in aromatic and medicinal plants, mango and orange juice, juices, pulps, jams, and beer, from Morocco, Pakistan, and Portugal are reported. In these studies, innovative techniques to study their presence has been developed, including liquid chromatography coupled with time-of-flight mass spectrometry to analyse mycotoxins and conjugated mycotoxins. Novel strategies to detect mycotoxin presence and comparisons the characteristics of a rapid quantitative analysis of different mycotoxins (deoxynivalenol, ochratoxin A, patulin, sterigmatocystin, and zearalenone) are also presented using acetyl- and butyrylcholinesterases and photobacterial strains of luminescent cells. Additionally, toxicological effects of zearalenone metabolites and beauvericin on SH-SY5Y neuronal cells are presented. One important point in the control of mycotoxins is related to decontaminated strategies, and in this sense the efficacy of potentially probiotic fruit-derived Lactobacillus isolates in removing aflatoxin M1 (AFM1) is presented. Other mycotoxin decontaminated techniques included in this book are electron beam irradiation (EBI) and degradation of zearalenone and ochratoxin A using ozone. Finally, a review that summarizes the newly discovered macrocyclic trichothecenes and their bioactivities over the last decade is included.The evaluation of the presence of mycotoxins in different matrices is achieved through different analytical tools (including quantitative or qualitative determinations). Studies of mycotoxin isolation, using chromatographyc equipment coupled to spectrometry detectors (QTrap-MS/MS, MS/MS tandem, QTOF-MS/MS), are the most useful tools to control their presence. All these studies represent key steps in the establishment of the limits of detection, limits of quantification, points of identification, accuracy, reproducibility, and repeatability of different procedures. The maximum permitted or recommended levels for mycotoxins in different matrices are within a wide range (including the levels tolerated by infants and animals). In addition, decontaminated strategies, as well as control and evaluation of exposure, are demanded by authorities and food safety systems.

patulin --- mango --- orange --- fruit-derived products --- food safety --- regulatory limits --- chitosan --- mycotoxins --- detoxification --- LC-MS/MS --- optimization --- Destruxins --- Bombyx mori --- BmArgRS --- BmLamin-C --- RNA helicase --- binding protein --- ozone --- electron beam irradiation --- degradation --- zearalenone --- ochratoxin A --- SH-SY5Y cells --- zearalenone derivates --- beauvericin --- MTT --- qTOF–MS/MS --- beer --- immunoaffinity clean-up --- LC-FD --- human risk assessment --- Enniatin B1 --- biomonitoring --- in vivo --- metabolomics --- high resolution mass spectrometry (HRMS) --- macrocyclic trichothecenes --- bioactivities --- putative biosynthetic pathway --- macrocycle formation --- entomopathogens --- mycoinsecticides --- secondary metabolites --- insect pathogenesis --- acetamiprid accumulation --- aflatoxin M1 --- Lactobacillus --- probiotics --- binding --- bioluminescent bacteria --- immobilized cells --- cholinesterase-based analysis --- analytical characteristics --- enzymatic detoxification --- co-occurrence --- Q-TOF-LC/MS --- exposure --- Morocco --- n/a --- qTOF-MS/MS

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Orchids are fascinating, with attractive flowers that sell in the markets and an increasing demand around the world. Additionally, some orchids are edible or scented and have long been used in preparations of traditional medicine.This book presents recent advances in orchid biochemistry, including original research articles and reviews. It provides in-depth insights into the biology of flower pigments, floral scent formation, bioactive compounds, pollination, and plant–microbial interaction as well as the biotechnology of protocorm-like bodies in orchids. It reveals the secret of orchid biology using molecular tools, advanced biotechnology, multi-omics, and high-throughput technologies and offers a critical reference for the readers.This book explores the knowledge about species evolution using comparative transcriptomics, flower spot patterning, involving the anthocyanin biosynthetic pathways, the regulation of flavonoid biosynthesis, which contributes to leaf color formation, gene regulation in the biosynthesis of secondary metabolites and bioactive compounds, the mechanism of pollination, involving the biosynthesis of semiochemicals, gene expression patterns of volatile organic compounds, the symbiotic relationship between orchids and mycorrhizal fungi, techniques using induction, proliferation, and regeneration of protocorm-like bodies, and so on. In this book, important or model orchid species were studied, including Anoectochilus roxburghii, Bletilla striata, Cymbidium sinense, Dendrobium officinale, Ophrys insectifera, Phalaenopsis ‘Panda’, Pleione limprichtii.

Research & information: general --- Biology, life sciences --- Phalaenopsis --- transcriptome --- microRNA --- anthocyanin biosynthesis --- molecular mechanism --- coelonin --- Bletilla striata --- anti-inflammation --- signal pathway --- cell-cycle arrest --- PTEN --- Dendrobium officinale --- PLP_deC --- bioinformatics --- expression pattern analysis --- evolution --- Pleione limprichtii --- flower color polymorphism --- variation within populations --- metabolome analysis --- anthocyanin biosynthetic pathway --- RNA sequencing --- transcription factor --- Dendrobium --- molecular identification --- endophytic fungi --- pathogenicity --- protocorm --- seedling --- Anoectochilus roxburghii --- Ceratobasidium sp. --- metabolome and transcriptome analyses --- flavonoid --- HPLC-MS/MS --- qRT-PCR --- Ophrys --- sexual deception --- semiochemicals --- fly orchid --- pollination --- comparative transcriptome --- active ingredients --- different tissues --- biotechnology --- breeding --- mass propagation --- Orchidaceae --- protocorm-like bodies --- somaclonal variation --- somatic embryogenesis --- Cymbidium --- floral scents --- volatile organic compounds --- metabolomic analysis --- differential metabolites --- enzyme activity --- gene expression --- leaf color --- Cymbidium sinense --- Phalaenopsis --- transcriptome --- microRNA --- anthocyanin biosynthesis --- molecular mechanism --- coelonin --- Bletilla striata --- anti-inflammation --- signal pathway --- cell-cycle arrest --- PTEN --- Dendrobium officinale --- PLP_deC --- bioinformatics --- expression pattern analysis --- evolution --- Pleione limprichtii --- flower color polymorphism --- variation within populations --- metabolome analysis --- anthocyanin biosynthetic pathway --- RNA sequencing --- transcription factor --- Dendrobium --- molecular identification --- endophytic fungi --- pathogenicity --- protocorm --- seedling --- Anoectochilus roxburghii --- Ceratobasidium sp. --- metabolome and transcriptome analyses --- flavonoid --- HPLC-MS/MS --- qRT-PCR --- Ophrys --- sexual deception --- semiochemicals --- fly orchid --- pollination --- comparative transcriptome --- active ingredients --- different tissues --- biotechnology --- breeding --- mass propagation --- Orchidaceae --- protocorm-like bodies --- somaclonal variation --- somatic embryogenesis --- Cymbidium --- floral scents --- volatile organic compounds --- metabolomic analysis --- differential metabolites --- enzyme activity --- gene expression --- leaf color --- Cymbidium sinense

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Mycotoxins are a Public Health concern that in last year have reached the top 10 food and product hazard categories in the Rapid Alert System for Food and Feed (RASFF), with almost six hundred notifications. The toxicological effects of mycotoxins are evaluated through the extrapolation of results from in vivo and in vitro assays. Studies of mycotoxins’ effects at the cellular level precede those in organs and systems. All these studies are key steps for risk assessment and following legislation for mycotoxins. This Special Issue of Toxins comprises 10 original contributions and two reviews. The Issue reports new findings regarding toxic mechanisms, the use of innovative techniques to study the potential toxicity of mycotoxins not only individually but in combination, reflecting a real scenario according to current studies of mycotoxins.

Medicine. --- Destruxin A --- Bombyx mori --- binding protein --- BmTudor-sn --- Bm12 cell --- Ochratoxin A (OTA) --- human Stem Cells --- mycotoxins --- cells --- cytotoxicity --- cell culture --- T-2 toxin --- HT-2 toxin --- apoptosis --- autophagy --- endophyte --- fungi --- neurotoxin --- lolitrems --- ochratoxin A --- beauvericin --- mixtures --- HepG2 cells --- genotoxicity --- cell cycle --- Fusarium --- Aspergillus --- Penicillium --- Alternaria --- emerging mycotoxin --- in vitro --- IPEC-J2 --- occurrence data --- trichothecene --- biosynthetic pathway --- acetyltransferase --- deacetylase --- deoxynivalenol --- 3-acetyldeoxynivalenol --- isotrichodermol --- isotrichodermin --- differentiated Caco-2 cells --- cell apoptosis --- transcriptome analysis --- hepatocyte --- chicken --- acute toxicity --- combined toxicity --- cell protection --- silibinin --- in silico prediction --- co-culture models --- mycotoxin interaction --- Loewe additivity --- combination index --- isobologram --- Chou-Talalay method --- MixLow --- IPEC-J2 cells --- RNA-seq --- inflammation --- MAPKs --- Destruxin A --- Bombyx mori --- binding protein --- BmTudor-sn --- Bm12 cell --- Ochratoxin A (OTA) --- human Stem Cells --- mycotoxins --- cells --- cytotoxicity --- cell culture --- T-2 toxin --- HT-2 toxin --- apoptosis --- autophagy --- endophyte --- fungi --- neurotoxin --- lolitrems --- ochratoxin A --- beauvericin --- mixtures --- HepG2 cells --- genotoxicity --- cell cycle --- Fusarium --- Aspergillus --- Penicillium --- Alternaria --- emerging mycotoxin --- in vitro --- IPEC-J2 --- occurrence data --- trichothecene --- biosynthetic pathway --- acetyltransferase --- deacetylase --- deoxynivalenol --- 3-acetyldeoxynivalenol --- isotrichodermol --- isotrichodermin --- differentiated Caco-2 cells --- cell apoptosis --- transcriptome analysis --- hepatocyte --- chicken --- acute toxicity --- combined toxicity --- cell protection --- silibinin --- in silico prediction --- co-culture models --- mycotoxin interaction --- Loewe additivity --- combination index --- isobologram --- Chou-Talalay method --- MixLow --- IPEC-J2 cells --- RNA-seq --- inflammation --- MAPKs