Haemocyte lysosomal fragility facing an environmental reality: a toxicological perspective with atrazine and Lymnaea stagnalis (Gastropoda, Pulmonata) as a test case.
2009
Russo, Jacqueline | Madec, Luc | Brehélin, Michel | Ecosystèmes, biodiversité, évolution [Rennes] (ECOBIO) ; Université de Rennes (UR)-Institut Ecologie et Environnement - CNRS Ecologie et Environnement (INEE-CNRS) ; Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) | Ecologie microbienne des insectes et interactions hôte-pathogène (EMIP) ; Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)
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Show more [+] Less [-]English. The present study investigates the potential use of haemocyte lysosomal fragility as a reliable indicator of toxic injury in snails subjected to herbicide atrazine. Two cytochemical assays were used. The first one was based on microscopic observations of neutral red dye, and the second one on a fluorescence spectroscopy approach using acridine orange, which had the advantage of being more reliable in assessing minor cell damage. Two sets of experiments were carried out incontrolled laboratory conditions (temperature, photoperiod) and in outdoor microcosms, which produce more realistic ecological conditions. An unequivocal relationship was shown, linking atrazine exposure to Lymnaea stagnalis haemocytes lysosomal permeability. High temperatures also had a negative effect on the lysosomal membrane. In the microcosms, the response was affected by seasonal factors, and led to an integrated cell response. It was concluded that lysosomal sensitivity reflects environmental changes. Moreover, the technique using acridine orange was shown to be sufficiently sensitive and reliable to serve as a lysosomal marker in a controlled environment.
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