Is the digestive gland of Mytilus galloprovincialis a tissue of choice for estimating cadmium exposure by means of metallothioneins?
A study performed over 12 months with caged mussels Mytilus galloprovincialis in the coastal marine zone, which is under urban pressure, reveals a temporal variation of digestive gland mass, which causes "biological dilution" of cytosolic metallothionein (MT) and trace metal (Cd, Cu, Zn, Fe, Mn) concentrations. The dilution effect was corrected by expressing the cytosolic MT and metal concentrations as the tissue content. Consequently, the changes of the average digestive gland mass coincide with the changes of MT and trace metal contents. From February to June, MT contents are nearly twice and trace metal contents nearly three times higher than those of the other months. The period of increased average digestive gland mass, of MT and trace metal contents probably overlaps with the sexual maturation of mussels (gametogenesis) and enhanced food availability. Since natural factors contribute more to the MT content than the sublethal levels of Cd, the digestive gland of M. galloprovincialis is not considered as a tissue of choice for estimating Cd exposure by means of MTs.
Raspor
Biserka
B
Ruder Bosković Institute, Center for Marine and Environmental Research, PO Box 180, Zagreb 10002, Croatia. raspor@rudjer.irb.hr
Dragun
Zrinka
Z
Erk
Marijana
M
Ivanković
Dusica
D
Pavicić
Jasenka
J
D000818:Animals; D049872:Bivalvia / Q000502:physiology*; D002104:Cadmium / Q000032:analysis / Q000493:pharmacokinetics*; D004064:Digestive System / Q000737:chemistry; D004781:Environmental Exposure; D004784:Environmental Monitoring / Q000379:methods; D008668:Metallothionein / Q000032:analysis* / Q000493:pharmacokinetics*; D015203:Reproducibility of Results; D012621:Seasons; D014018:Tissue Distribution
D002104:Cadmium; D008668:Metallothionein