Effect of the ostreolysin A/pleurotolysin B pore-forming complex on neuroblastoma cell morphology and intracellular Ca²⁺ activity. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Toxicological Sciences Année : 2015

Effect of the ostreolysin A/pleurotolysin B pore-forming complex on neuroblastoma cell morphology and intracellular Ca²⁺ activity.

Résumé

Ostreolysin A (OlyA) and pleurotolysin B (PlyB), isolated from edible oyster mushrooms, form a cytolytic complex (OlyA/PlyB) in membrane cells that causes respiratory arrest. This study evaluated the mechanisms underlying cytotoxic OlyA/PlyB activity in neuroblastoma NG108-15 cells. Confocal microscopy with morphometric analysis revealed that OlyA/PlyB increased the 3-dimensional projected area of differentiated cells. Iso-osmotic replacement of NaCl by sucrose or Na-isethionate prevented the cellular swelling. This suggests that formation of cellular edema requires the presence of Na(+) and/or Cl(-) in the extracellular space and may be related to an influx of Na(+) and/or a shift in Cl(-), which induce a marked influx of water that is ultimately responsible for cellular swelling. In addition, extracellular Ca(2+) moderately contributed to the swelling because benzamil (10 µM), a 3Na(+)/Ca(2+) exchange (NCX) inhibitor, and Ca(2+)-free medium partially prevented this response. Fluorometric measurements revealed that OlyA/PlyB, at approximately 15-fold higher concentrations, increased the intracellular Ca(2+) activity [Ca(2+)]i. This increase was dependent on the presence of Na(+) and Ca(2+) in the external medium and was sensitive to benzamil. It is thus likely that a switch in the NCX mode, associated with the de novo formation of non-selective ion pores by OlyA/PlyB in cellular plasma membranes, plays an important role in this effect. Overall, OlyA/PlyB affects neuroblastoma cell morphology and Ca(2+) homeostasis to influence the toxin-induced respiratory arrest.
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Dates et versions

hal-01165616 , version 1 (24-05-2020)

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Milka Vrecl, Monika Babnik, Uroš Diacci, Evelyne Benoit, Robert Frangež. Effect of the ostreolysin A/pleurotolysin B pore-forming complex on neuroblastoma cell morphology and intracellular Ca²⁺ activity.. Toxicological Sciences, 2015, 144 (2), pp.276-83. ⟨10.1093/toxsci/kfu316⟩. ⟨hal-01165616⟩
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