Comparative Histopathological Evaluation of Permethrin, Pirimiphos Methyl and Bendiocarb Toxicities in Testes, Liver and kidney of rat.

The increasing use of insecticides in agriculture and in public health calls for greater attention for studying their possible toxic effect (s) on man and animals. Acute toxic effects have been relatively well known whereas chronic effects require further studies. The aim of the present work was, therefore, to study the histopathological changes in testes, liver and kidney of rats due to 30 days feeding on diet containing permethrin, pirimiphos methyl and bendiocarb. The dose used for each insecticide represented a concentration that equals ten times the acceptable human daily intake. These doses are far below the LD50, but represent possible exposure doses. Forty male Sprague- Dawley rats were divided into 4 equal groups. Animals of each group were fed either by normal diet, or diet mixed with permethrin (21.739 ppm), pirimiphos methyl (4.350 ppm) or bendiocarb (2ppm) for 30 days. Histological sections of testes, liver and kidneys were examined and histopathological changes and quantitative estimates were recorded. Incidence of spermatogenic suppression, Leydig cell atrophy and vacuolation of Sertoli cells were most prominent in testicular sections from primiphos methyl treated animal testis than in animals of the other groups. Peremethrin feeding resulted in the least deteriorative changes. In sections of liver, dilatation and congestion of blood sinusoids was most evident in the group treated with primiphos methyl and to less extent in those treated with bendiocarb. Swollen hepatocytes with pyknotic nuclei and incidence of apoptosis were also recorded. In kidney sections, vacuolar degeneration, tubular and capsular dilatation, and glomerular congestion were observed especially in primiphos methyl treated rats. In conclusion, the obtained changes were of different severity as a response of exposure to permethrin, pirimiphos methyl or bendiocarb at the same equivelant of human acceptable daily intake.