Changes in cell-type composition in digestive gland of slugs and its influence in biomarkers following transplantation between a relatively unpolluted and a chronically metal-polluted site.
Changes in cell-type composition (CCTC) is a general phenomenon that takes place in the digestive gland epithelium of stressed molluscs. The aim of the present work was to determine whether CCTC is a reversible process in the digestive gland of sentinel slugs chronically exposed to metal pollution and how CCTC affects metal accumulation parameters and different cell and tissue biomarkers of exposure and effect. Slugs (Arion ater) from an abandoned zinc mine were transferred to a relatively unpolluted site and the other way around for 3, 10 and 28 d. The volume density of black silver deposits (Vv(BSD)) after autometallography, and metallothionein (MT) levels were used as biomarkers of exposure to metals and CCTC and lysosomal responses were selected as effect biomarkers. Results indicated that slugs were sensitive to recent metal pollution; however, slugs chronically exposed to metals presented some characteristic features and were less responsive to pollution cessation without signs of CCTC reversal.
Zaldibar
B
B
Cell Biology & Histology Laboratory, Zoology & Animal Cell Biology Department, School of Science & Technology, University of the Basque Country, PO Box 644, E-48080 Bilbo, Bizkai, Basque Country, Spain. benat.zaldibar@ehu.es
Cancio
I
I
Soto
M
M
Marigómez
I
I
D000818:Animals; D015415:Biomarkers / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods; D004785:Environmental Pollutants / Q000378:metabolism / Q000633:toxicity*; D041981:Gastrointestinal Tract / Q000166:cytology* / Q000187:drug effects; D049851:Gastropoda / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D005966:Glucuronidase / Q000032:analysis; D006651:Histocytochemistry / Q000379:methods; D008247:Lysosomes / Q000648:ultrastructure; D008668:Metallothionein / Q000032:analysis; D008670:Metals / Q000378:metabolism / Q000633:toxicity*; D016622:Silver Staining; D013995:Time; D036401:Toxicity Tests, Chronic
D015415:Biomarkers; D004785:Environmental Pollutants; D008670:Metals; D008668:Metallothionein; D005966:Glucuronidase