Metallothioneins and cytosolic metals in Neomysis integer exposed to cadmium at different salinities

Erk, Marijana; Muyssen, Brita T. A.; Ghekiere, An; Janssen, Colin R. (2008) Metallothioneins and cytosolic metals in Neomysis integer exposed to cadmium at different salinities. Marine Environmental Research, 65 (5). pp. 437-444. ISSN 0141-1136

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Abstract

In the present study the induction of metallothioneins (MTs) and its relation to cytosolic metal concentrations (Zn, Cu and Cd) in the euryhaline crustacean Neomysis integer exposed to Cd at different salinities was studied. N. integer was exposed to the same free cadmium ion activity of 5.74 × 10−9 mol l−1 (i.e. 1/5 of the 96 h LC50 value expressed as cadmium activity) in hypo-osmotic (5 psu), isosmotic (16 psu) and hyper-osmotic media (25 psu) for 7 days. In this way, the effect of salinity on cadmium speciation was eliminated and therefore the physiological effect of salinity on Cd accumulation and MT induction could be studied. The accumulation of cytosolic Cd in N. integer changed with salinity from 1.11 ± 0.05 μmol l−1 at 5 psu up to 1.43 ± 0.17 μmol l−1 at 25 psu. This could indicate that the physiological response of euryhaline estuarine invertebrates like N. integer to salinity changes can influence the rate of trace metal uptake from solution. While the salinity changes did not cause significant differences in cytosolic Zn concentrations (mean value of all tested salinities: 34.4 ± 2.8 μmol l−1), an inverse relationship between salinity and cytosolic Cu concentration was observed. The highest concentration of 15.7 ± 2.3 μmol Cu l−1 was determined at 5 psu and the lowest 10.9 ± 1.4 μmol Cu l−1 at 25 psu. This could point to a possible relationship between the copper concentration and the hemocyanin metabolism in N. integer. This is the first time that differential pulse voltammetry method was applied to MT assays with N. integer. Although the exposure to Cd resulted in a higher Cd cytosolic concentration, no subsequent MT increase was detected. The significant positive correlation between MT levels and cytosolic Cu concentrations (Spearman correlation coefficient rs = 0.356, p = 0.009) implies a strong relationship between MT and Cu in N. integer.

Item Type:	Article
Additional Information:	NOTICE: this is the author’s version of a work that was accepted for publication in Marine Environmental Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Marine Environmental Research, Vol 65, Issue 5, (2008). DOI: 10.1016/j.marenvres.2008.02.002
Uncontrolled Keywords:	mysid; Neomysis integer; cadmium; salinity; metallothionein; cytosolic metals
Subjects:	NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science NATURAL SCIENCES > Interdisciplinary Natural Sciences > Environmental Science
Divisions:	Division for Marine and Enviromental Research
Projects:	Project title Project leader Project code Project type Stanične promjene u vodnih organizama pobuđene metalima [40333] Biserka Raspor 098-0982934-2721 MZOS
Depositing User:	Marijana Erk
Date Deposited:	03 Nov 2014 10:04
URI:	http://fulir.irb.hr/id/eprint/1575
DOI:	10.1016/j.marenvres.2008.02.002

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