Kinetics of copper accumulation in <i>Lessonia nigrescens</i> (Phaeophyceae) under conditions of environmental oxidative stress

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dc.contributor.authorAndrade, Santiago
dc.contributor.authorContreras, Loretto
dc.contributor.authorMoffett, James W.
dc.contributor.authorCorrea, Juan A.
dc.date.accessioned2025-01-21T01:06:03Z
dc.date.available2025-01-21T01:06:03Z
dc.date.issued2006
dc.description.abstractJuvenile individuals of the brown kelp Lessonia nigrescens were exposed to a coastal environment chronically impacted by copper mine wastes and currently displaying more than 250 nM of total dissolved copper. The kinetic of copper accumulation in the intra and extracellular compartments was determined and correlated to the oxidative burst resulting from copper-mediated oxidative stress. Accumulation involved an initial adsorption onto the outer cell wall followed by a slower uptake into the cells. A linear pattern of copper uptake over time was found during the first 52 h of exposure, and a steady state was reached at 76 h. The resulting oxidative stress was found to be inefficiently attenuated, and the intracellular level of copper remained sufficiently high to determine a persistently higher than normal level of reactive oxygen species (ROS). Thus, our results strongly suggest that, in L. nigrescens, copper needs to reach an intracellular threshold before oxidative burst develops. Furthermore, it was found that the high ROS levels generated by copper accumulation within the cells persists after the oxidative burst has ceased, suggesting a limited capacity of the algal tissue to buffer the increases of ROS caused by the environmental copper levels. (c) 2006 Elsevier B.V. All rights reserved.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.aquatox.2006.04.006
dc.identifier.issn0166-445X
dc.identifier.urihttps://doi.org/10.1016/j.aquatox.2006.04.006
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/96077
dc.identifier.wosidWOS:000238934900010
dc.issue.numero4
dc.language.isoen
dc.pagina.final401
dc.pagina.inicio398
dc.revistaAquatic toxicology
dc.rightsacceso restringido
dc.subjectcopper uptake
dc.subjectmacroalgae
dc.subjectoxidative stress
dc.titleKinetics of copper accumulation in <i>Lessonia nigrescens</i> (Phaeophyceae) under conditions of environmental oxidative stress
dc.typeartículo
dc.volumen78
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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