841. Cyanobacterial cyclic peptides can disrupt cytoskeleton organization in human astrocytes : a contribution to the understanding of the systemic toxicity of cyanotoxinsAnja Bubik, Robert Frangež, Monika C. Žužek, Ion Gutiérrez-Aguirre, Tamara Lah Turnšek, Bojan Sedmak, 2024, original scientific article Abstract: The systemic toxicity of cyclic peptides produced by cyanobacteria (CCPs) is not yet completely understood. Apart from the most known damages to the liver and kidneys, symptoms of their neurotoxicity have also been reported. Hepatotoxic CCPs, like microcystins, as well as non-hepatotoxic anabaenopeptins and planktopeptins, all exhibit cytotoxic and cytostatic effects on mammalian cells. However, responses of different cell types to CCPs depend on their specific modes of interaction with cell membranes. This study demonstrates that non-hepatotoxic planktopeptin BL1125 and anabaenopeptins B and F, at concentrations up to 10 µM, affect normal and tumor human astrocytes (NHA and U87-GM) in vitro by their almost immediate insertion into the lipid monolayer. Like microcystin-LR (up to 1 µM), they inhibit Ser/Thr phosphatases and reorganize cytoskeletal elements, with modest effects on their gene expression. Based on the observed effects on intermediate filaments and intermediate filament linkage elements, their direct or indirect influence on tubulin cytoskeletons via post-translational modifications, we conclude that the basic mechanism of CCP toxicities is the induction of inter- and intracellular communication failure. The assessed inhibitory activity on Ser/Thr phosphatases is also crucial since the signal transduction cascades are modulated by phosphorylation/dephosphorylation processes.
Keywords: astrocytes, cyclic cyanobacterial peptides, cytoskeletal organization, Ser/Thr phosphatases, systemic toxicity, cyanobacteria
Published in DiRROS: 28.08.2024; Views: 417; Downloads: 361
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842. Toward the first documented extinction of a marine macroalga in the Mediterranean Sea?Emmanuelle Patricia Descourvières, Vinko Bandelj, Adriano Sfriso, Martina Orlando-Bonaca, Vesna Mačić, Ljiljana Iveša, Silvija Kipson, Edi Gljušćić, Claudio Battelli, Isabella Moro, Cosimo Solidoro, Annalisa Falace, 2024, original scientific article Abstract: Fucus virsoides is a glacial relict-species endemic to the Adriatic that was widespread from northern Italy to southern Albania. In recent decades, however, it has suffered an alarming decline. In this study, all available records were reviewed to reconstruct its historical and current occurrence and to investigate the possible causes of its decline. Comprehensive mapping revealed a continuing decline with a significant shift, leaving only about 20 fragmented populations. While the species is already classified as critically endangered in Albania, F. virsoides could be considered functionally extinct in Istria (Croatia), critically threatened with extinction in Italy and Montenegro and locally extinct in Slovenia. The status of the species in the rest of Croatia is still unclear. The remaining populations are located in areas characterised by low temperatures, low salinity and high nutrient concentrations. Long-term analyses of these key abiotic factors revealed profound changes that suggest a link to the species' decline. This study provides a thorough assessment of the overall status of F. virsoides and argues for its inclusion on the IUCN Red List. Immediate conservation measures are needed for the long-term survival of this species.
Keywords: Adriatic sea, endangered species, distribution, hydrobiology, marine biology
Published in DiRROS: 28.08.2024; Views: 436; Downloads: 455
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845. Poročilo o preskusu št.: LVG 2024-094 : vzorec št. 2024/00263Barbara Piškur, Zina Devetak, Patricija Podkrajšek, Špela Hočevar, Nikica Ogris, 2024, expertise, arbitration decision Keywords: varstvo gozdov, morfološke analize, ruj, traheomikoza, bolezni rastlin, verticilijska uvelost listavcev
Published in DiRROS: 27.08.2024; Views: 326; Downloads: 95
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