6 research outputs found

    Таксономический статус Neoechinorhynchus agilis (Acanthocephala, Neoechinorhynchidae), с описанием двух новых видов рода от кефалевых рыб (Teleostei, Mugilidae) Атлантики и Пацифики

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    Широкое географическое распространение, богатый список хозяев, а также значительная вариабельность метрических признаков акантоцефалы Neoechinorhynchus agilis (Rudolphi, 1819) ставит вопрос о таксономическом статусе этого вида. Для проведения сравнительного морфологического анализа был использован типичный материал Рудольфи и ваучерные экземпляры Ямагути, а также собственный материал, собранный в западной части Тихого океана и северо-восточной Атлантике. В результате исследования было обнаружено три вида акантоцефал Neoechinorhynchus, в том числе два вида из Атлантики: N. (N.) agilis и N. (H.) personatus Tkach, Sarabeev et Shvetsova, sp. n., и один вид из Тихого океана, N. (H.) yamagutii Tkach, Sarabeev et Shvetsova, sp. n. Описанные в работе виды хорошо различаются как морфологически, так и метрически. Разделение N. agilis на три вида, два из которых описаны впервые, является основой для дальнейшего пересмотра находок этой акантоцефалы из разных регионов и от разных хозяев.The wide variability in morphological features, geographical and host ranges of mullet acanthocephalan parasite Neoechinorhynchus agilis (Rudolphi, 1819), raises the question of taxonomic status of this species. Rudolphi’s type and Yamaguti`s voucher specimens, as well as our own material from the WW Pacific and NE Atlantic region were used herein to provide comparative morphological analysis. The study revealed three different species of Neoechinorhynchus, N. (N.) agilis and N. (H.) personatus Tkach, Sarabeev et Shvetsova, sp. n. in the Atlantic and N. (H.) yamagutii Tkach, Sarabeev et Shvetsova, sp. n. in the Pacific. Strong morphological and morphometric differences were found between three described herein species from different hosts and regions. The dividing of N. agilis into three species, two of them are new, provides a basis for the further revision of host-geographical records of mullet acanthocephalan parasites

    SIRT6-dependent cysteine monoubiquitination in the PRE-SET domain of Suv39h1 regulates the NF-κB pathway

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    Sirtuins are NAD+-dependent deacetylases that facilitate cellular stress response. They include SirT6, which protects genome stability and regulates metabolic homeostasis through gene silencing, and whose loss induces an accelerated aging phenotype directly linked to hyperactivation of the NF-κB pathway. Here we show that SirT6 binds to the H3K9me3-specific histone methyltransferase Suv39h1 and induces monoubiquitination of conserved cysteines in the PRE-SET domain of Suv39h1. Following activation of NF-κB signaling Suv39h1 is released from the IκBα locus, subsequently repressing the NF-κB pathway. We propose that SirT6 attenuates the NF-κB pathway through IκBα upregulation via cysteine monoubiquitination and chromatin eviction of Suv39h1. We suggest a mechanism based on SirT6-mediated enhancement of a negative feedback loop that restricts the NF-κB pathway.This work was supported by the Fundació La Marató de TV3 (20133810 to A.V.), the Spanish Ministry of Economy and competitiveness-MINECO (SAF2011-25860, SAF2014-55964R to A.V.) confunded by FEDER funds/European Regional Development Fund (ERDF)-a way to Build Europe, and the Catalan government agency AGAUR (2009-SGR-914 to A.V.) The IDIBELL Proteomics Unit belongs to ProteoRed, PRB2-ISCIII, and is supported by grant PT13/0001/0033 and Cellex Foundation. S.B.B. is the recipient of a 13FIS037 fellowship

    Extracellular vesicles: mediators and biomarkers of pathology along CNS barriers

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