This study provides the first evaluation of the cytotoxic effects of the recently identified palytoxin (PLTX) analog, ovatoxin-a (OVTX-a), the major toxin produced by Ostreopsis cf. ovata in the Mediterranean Sea. Its increasing detection during Ostreopsis blooms and in seafood highlights the need to characterize its toxic effects and to set up appropriate detection methods. OVTX-a is about 100 fold less potent than PLTX in reducing HaCaT cells viability (EC50 = 1.1 × 10−9 M vs 1.8 × 10−11 M, MTT test) in agreement with a reduced binding affinity (Kd = 1.2 × 10−9 vs 2.7 × 10−11 M, saturation experiments on intact cells). Similarly, OVTX-a hemolytic effect is lower than that of the reference PLTX compound. Ost-D shows the lowest cytotoxicity toward HaCaT keratinocytes, suggesting the lack of a hydroxyl group at C44 as a critical feature for PLTXs cytotoxic effects. A sandwich ELISA developed for PLTX detects also OVTX-a in a sensitive (LOD = 4.2 and LOQ = 5.6 ng/mL) and accurate manner (Bias = 0.3%), also in O. cf. ovata extracts and contaminated mussels. Although in vitro OVTXa appears less toxic than PLTX, its cytotoxicity at nanomolar concentrations after short exposure time rises some concern for human health. The sandwich ELISA can be a viable screening method for OVTXs detection in monitoring program.

Ovatoxin-a, A Palytoxin Analogue Isolated from Ostreopsis cf. ovata Fukuyo: Cytotoxic Activity and ELISA Detection / Pelin, Marco; Forino, Martino; Brovedani, Valentina; Tartaglione, Luciana; Dell'Aversano, Carmela; Pistocchi, Rossella; Poli, Mark; Sosa, Silvio; Florio, Chiara; Ciminiello, Patrizia; Tubaro, Aurelia. - In: ENVIRONMENTAL SCIENCE & TECHNOLOGY. - ISSN 0013-936X. - 50:(2016), pp. 1544-1551. [10.1021/acs.est.5b04749]

Ovatoxin-a, A Palytoxin Analogue Isolated from Ostreopsis cf. ovata Fukuyo: Cytotoxic Activity and ELISA Detection

FORINO, MARTINO
Secondo
Methodology
;
TARTAGLIONE, LUCIANA
Methodology
;
DELL'AVERSANO, CARMELA
Formal Analysis
;
CIMINIELLO, PATRIZIA
Co-ultimo
Project Administration
;
2016

Abstract

This study provides the first evaluation of the cytotoxic effects of the recently identified palytoxin (PLTX) analog, ovatoxin-a (OVTX-a), the major toxin produced by Ostreopsis cf. ovata in the Mediterranean Sea. Its increasing detection during Ostreopsis blooms and in seafood highlights the need to characterize its toxic effects and to set up appropriate detection methods. OVTX-a is about 100 fold less potent than PLTX in reducing HaCaT cells viability (EC50 = 1.1 × 10−9 M vs 1.8 × 10−11 M, MTT test) in agreement with a reduced binding affinity (Kd = 1.2 × 10−9 vs 2.7 × 10−11 M, saturation experiments on intact cells). Similarly, OVTX-a hemolytic effect is lower than that of the reference PLTX compound. Ost-D shows the lowest cytotoxicity toward HaCaT keratinocytes, suggesting the lack of a hydroxyl group at C44 as a critical feature for PLTXs cytotoxic effects. A sandwich ELISA developed for PLTX detects also OVTX-a in a sensitive (LOD = 4.2 and LOQ = 5.6 ng/mL) and accurate manner (Bias = 0.3%), also in O. cf. ovata extracts and contaminated mussels. Although in vitro OVTXa appears less toxic than PLTX, its cytotoxicity at nanomolar concentrations after short exposure time rises some concern for human health. The sandwich ELISA can be a viable screening method for OVTXs detection in monitoring program.
2016
Ovatoxin-a, A Palytoxin Analogue Isolated from Ostreopsis cf. ovata Fukuyo: Cytotoxic Activity and ELISA Detection / Pelin, Marco; Forino, Martino; Brovedani, Valentina; Tartaglione, Luciana; Dell'Aversano, Carmela; Pistocchi, Rossella; Poli, Mark; Sosa, Silvio; Florio, Chiara; Ciminiello, Patrizia; Tubaro, Aurelia. - In: ENVIRONMENTAL SCIENCE & TECHNOLOGY. - ISSN 0013-936X. - 50:(2016), pp. 1544-1551. [10.1021/acs.est.5b04749]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/641422
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