Abstract:
:The multixenobiotic resistance (MXR) mechanism, mediated by activity of the transmembrane P-glycoprotein, represents a basic biological defence system in aquatic organisms. Here we investigate the MXR transport activity in an aquatic vertebrate, the common carp (Cyprinus carpio). We measured the accumulation rate of a model MXR substrate, the fluorescent dye rhodamine B (RB), in gills, lateral muscles, liver and bile. Results obtained using this method showed a significant increase of RB accumulation in tissues of fish exposed for I h to 3 microM RB in the presence of the model MXR inhibitors cyclosporin A (CA, 5 microM) or verapamil (VER, 10 microM), when compared with specimens exposed without inhibitors. The highest increase in RB accumulation detected in the liver (VER 54%, CA 170%) indicates that among the tissues analysed within this study, liver is the most prominent candidate organ for the functional detection of MXR activity in C. carpio.
journal_name
Mar Environ Resjournal_title
Marine environmental researchauthors
Smital T,Sauerborn Rdoi
10.1016/s0141-1136(02)00155-1keywords:
subject
Has Abstractpub_date
2002-09-01 00:00:00pages
449-53issue
3-5eissn
0141-1136issn
1879-0291pii
S0141-1136(02)00155-1journal_volume
54pub_type
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