The herbicide paraquat (PQ), still widely used in developing countries, represents a serious risk factor for human and environmental health. To test the sublethal effects of PQ on the freshwater bivalve Dreissena polymorpha, mussels were exposed to 0.125, 0.250, 0.500 mg/L for 7 and 14 days and histologically screened. PQ's genotoxic potential was also determined in haemocytes by the micronucleus, MN, assay. At concentrations >= 0.250mg/L, severe lesions, such as cellular vacuolation, lysis and thinness of the germinative epithelia were observed in the digestive gland and testis. A positive trend between the number of granulocytes and all PQ concentrations was observed in both gonads and digestive glands, addressing the inflammatory capacity of this herbicide on these tissues. Mussels exposed to PQ also exhibited a significant MN induction. The spontaneous MN frequencies ranged from 2.75 to 4.25 parts per thousand, while PQ-induced MN rates in treated mussels were between 3.50 and 12.50 parts per thousand. The histopathological effects on the digestive and reproductive systems, as well as the MN induction in the haemocytes, confirmed the cytotoxic and genotoxic effects of PQ also in D. polymorpha.

Histological changes and micronucleus induction in the zebra mussel Dreissena polymorpha after paraquat exposure / P. Mantecca, G. Vailati, R. Bacchetta. - In: HISTOLOGY AND HISTOPATHOLOGY. - ISSN 0213-3911. - 21:8(2006), pp. 829-840.

Histological changes and micronucleus induction in the zebra mussel Dreissena polymorpha after paraquat exposure

P. Mantecca
Primo
;
G. Vailati
Secondo
;
R. Bacchetta
Ultimo
2006

Abstract

The herbicide paraquat (PQ), still widely used in developing countries, represents a serious risk factor for human and environmental health. To test the sublethal effects of PQ on the freshwater bivalve Dreissena polymorpha, mussels were exposed to 0.125, 0.250, 0.500 mg/L for 7 and 14 days and histologically screened. PQ's genotoxic potential was also determined in haemocytes by the micronucleus, MN, assay. At concentrations >= 0.250mg/L, severe lesions, such as cellular vacuolation, lysis and thinness of the germinative epithelia were observed in the digestive gland and testis. A positive trend between the number of granulocytes and all PQ concentrations was observed in both gonads and digestive glands, addressing the inflammatory capacity of this herbicide on these tissues. Mussels exposed to PQ also exhibited a significant MN induction. The spontaneous MN frequencies ranged from 2.75 to 4.25 parts per thousand, while PQ-induced MN rates in treated mussels were between 3.50 and 12.50 parts per thousand. The histopathological effects on the digestive and reproductive systems, as well as the MN induction in the haemocytes, confirmed the cytotoxic and genotoxic effects of PQ also in D. polymorpha.
Dreissena polymorpha; Genotoxicity; Histopathology
Settore BIO/06 - Anatomia Comparata e Citologia
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/25354
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