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Toxic impact of phosphamidon on protein degradation in phasic and tonic muscles of marine prawn, Penaeus indicus (H. Milne Edwards). | LitMetric

Levels of various protein fractions, (sarcoplasmic, myosin, actin, non-collagen and collagen) and the rate of their degradation by proteases were studied in phasic and tonic muscles of marine prawn, Penaeus indicus following acute (2 d) and chronic (15 d) exposure to sublethal concentration of phosphamidon. During exposure, greater decrease in sarcoplasmic protein fraction was observed in phasic muscle as compared to other myofibrillar proteins. But the sarcoplasmic protein content showed an elevation in tonic muscle. The changes in protein fractions were more pronounced during acute exposure than chronic exposure both in phasic and tonic muscles. These changes were correlated with the elevation of the acidic, neutral and basic protease activities during acute and chronic exposure. Free amino acids were increased during acute exposure, while they showed a significant decrease during chronic exposure in both the muscles. These results indicate that protein metabolism in both phasic and tonic muscles was significantly altered following phosphamidon exposure. These differential responses observed at acute and chronic exposure indicate the operation of compensatory mechanisms to mitigate the phosphamidon toxic stress.

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http://dx.doi.org/10.3109/13813459009113996DOI Listing

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