title: Cytotoxic effects of cylindrospermopsin in mitotic and non-mitotic Vicia faba cells.
abstract: Cylindrospermopsin (CYN) is a cyanobacterial toxin known as a eukaryotic protein synthesis inhibitor. We aimed to study its effects on growth, stress responses and mitosis of a eukaryotic model, Vicia faba (broad bean). Growth responses depended on exposure time (3 or 6d), cyanotoxin concentration, culture conditions (dark or continuous light) and V. faba cultivar ("Standard" or "ARC Egypt Cross"). At 6d of exposure, CYN had a transient stimulatory effect on root system growth, roots being possibly capable of detoxification. The toxin induced nucleus fragmentation, blebbing and chromosomal breaks indicating double stranded DNA breaks and programmed cell death. Root necrotic tissue was observed at 0.1-20 μg mL(-1) CYN that probably impeded toxin uptake into vascular tissue. Growth and cell death processes observed were general stress responses. In lateral root tip meristems, lower CYN concentrations (0.01-0.1 μg mL(-1)) induced the stimulation of mitosis and distinct mitotic phases, irrespective of culture conditions or the cultivar used. Higher cyanotoxin concentrations inhibited mitosis. Short-term exposure of hydroxylurea-synchronized roots to 5 μg mL(-1) CYN induced delay of mitosis that might have been related to a delay of de novo protein synthesis. CYN induced the formation of double, split and asymmetric preprophase bands (PPBs), in parallel with the alteration of cell division planes, related to the interference of cyanotoxin with protein synthesis, thus it was a plant- and CYN specific alteration.
authors.affiliation: University of Debrecen, Faculty of Science and Technology, Department of Botany, Egyetem ter 1, H-4032 Debrecen, Hungary. Electronic address: gtamas0516@gmail.com.
authors.forename: Tamás
authors.initials: T
authors.lastname: Garda
authors.affiliation: University of Debrecen, Faculty of Science and Technology, Department of Botany, Egyetem ter 1, H-4032 Debrecen, Hungary. Electronic address: ribamilan@freemail.hu.
authors.forename: Milán
authors.initials: M
authors.lastname: Riba
authors.affiliation: University of Debrecen, Faculty of Science and Technology, Department of Botany, Egyetem ter 1, H-4032 Debrecen, Hungary. Electronic address: vasas.gabor@science.unideb.hu.
authors.forename: Gábor
authors.initials: G
authors.lastname: Vasas
authors.affiliation: University of Debrecen, Faculty of Science and Technology, Department of Botany, Egyetem ter 1, H-4032 Debrecen, Hungary. Electronic address: beyerdani@gmail.com.
authors.forename: Dániel
authors.initials: D
authors.lastname: Beyer
authors.affiliation: University of Debrecen, Faculty of Science and Technology, Department of Botany, Egyetem ter 1, H-4032 Debrecen, Hungary. Electronic address: hamvas.marta@science.unideb.hu.
authors.forename: Márta
authors.initials: M
authors.lastname: M-Hamvas
authors.affiliation: University of Debrecen, Faculty of Science and Technology, Department of Botany, Egyetem ter 1, H-4032 Debrecen, Hungary. Electronic address: gerda17meister@gmail.com.
authors.forename: Gréta
authors.initials: G
authors.lastname: Hajdu
authors.affiliation: University of Debrecen, Faculty of Science and Technology, Department of Botany, Egyetem ter 1, H-4032 Debrecen, Hungary. Electronic address: dike15ster@gmail.com.
authors.forename: Ildikó
authors.initials: I
authors.lastname: Tándor
authors.affiliation: University of Debrecen, Faculty of Science and Technology, Department of Botany, Egyetem ter 1, H-4032 Debrecen, Hungary. Electronic address: mathe.csaba@science.unideb.hu.
authors.forename: Csaba
authors.initials: C
authors.lastname: Máthé
mesh_terms: D000470:Alkaloids; D001427:Bacterial Toxins / Q000633:toxicity*; D016923:Cell Death / Q000187:drug effects; D032461:Chromosomes, Plant / Q000187:drug effects / Q000648:ultrastructure; D000087522:Cyanobacteria Toxins; D003599:Cytoskeleton / Q000187:drug effects / Q000378:metabolism; D004534:Egypt; D008387:Marine Toxins / Q000633:toxicity*; D018519:Meristem / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D052998:Microcystins / Q000633:toxicity*; D008938:Mitosis / Q000187:drug effects*; D008940:Mitotic Index; D010940:Plant Proteins / Q000096:biosynthesis; D018517:Plant Roots / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D014498:Uracil / Q000031:analogs & derivatives* / Q000633:toxicity; D031307:Vicia faba / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism
chemical_list: D000470:Alkaloids; D001427:Bacterial Toxins; D000087522:Cyanobacteria Toxins; D008387:Marine Toxins; D052998:Microcystins; D010940:Plant Proteins; C089595:cylindrospermopsin; D014498:Uracil
keywords: Cell death; Cylindrospermopsin; Growth stimulation; Mitotic alterations; Preprophase band; Vicia faba