Abstract
Fish bile has been applied as a biomarker for environmental contamination for several decades, and several pollutants are known to be excreted in this matrix. With the advent of the proteomic field, however, the discovery of protein biomarkers of response to pollutants has become the highlight, and fish bile shows very high potential in this regard. A proteomic case study carried out in Southeastern Brazil with mullet bile indicates the importance of assessing bile colour, as different feeding statuses lead to differential proteomic profiles as observed by 2D SDS-PAGE analyses. In addition, several heat-stable proteins displaying a differential gel profile were also observed in tilapia bile when compared a contaminated and reference site. Therefore, the bile proteome displays the potential to offer a more sensitive and informative method to analyse the presence and effects of contaminants in aquatic ecosystems.
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