Histological Changes in the Lung and Liver Tissues in Mice Exposed to Pyrethroid Inhalation

Nadeem SHEIKH, Saira JAVED, Asmatullah ASMATULLAH, Khawaja Raees AHMAD, Tahir ABBAS, Javaid IQBAL

Abstract


Cypermethrin, a type II pyrethroid, is one of the most widely used insecticides in Pakistan. It is considered to be a safe pesticide; however, the possible health hazards of this pyrethroid have been ignored. Cypermethrin may become an air pollutant and adversely affect the health of non-target organisms, leading to acute or chronic disorders. The present work aims to investigate the effects of cypermethrin on lung and liver tissues due to inhalation exposure. The study is performed on 16 mature Swiss albino mice, including controls. The animals are divided into 4 groups (4 mice each) and exposed to 0.5 % dilution of cypermethrin in an inhalation chamber (40×35×25 cm3) for different time periods, whereas control animals are not exposed to any insecticide. The histopathological changes in lungs and liver tissues reveal that cypermethrin exposure induces time dependent changes in the liver and in the lungs. It damages the normal organization of liver tissues, causing liver injury due to necrosis, significant decrease in number of cells, and widening of sinusoids and fibrosis. Inhalation exposure of cypermethrin results in significant hyperplasia, clumping of cells and necrosis in the lungs. It also induces pulmonary edema, alveolitis, and pulmonary fibrosis by the deposition of collagen. Taking these findings together, it may be concluded that cypermethrin and other pyrethroids cause hazardous effects in non-target organisms through inhalation exposure. Serious efforts and awareness are required to monitor and reduce the insecticide induced health hazards in third world countries.

doi:10.14456/WJST.2014.67

Keywords


Pyrethroid, cancer, histology, liver, lung

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References


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