Toxopathological and immunotoxical effects of thiamethoxam in white mice

In order to investigate toxopathological and immunotoxic, effects of thiamethoxam in mice. Forty eight white mice, both sexes were divided into four groups equally, 1st group was immunized twicely with Brucella melitensis Rev1.with two weeks intervals. 2nd group was immunized as in the 1st group and at same time administrated orally with 83.73mg\kg B.W of thiamethoxam daily for 6 weeks.3rd group was administrated with thiamethoxam as in the 2nd group while the 4th group was served as control negative group. Immunological examination DTH and humoral immunity revealed that the thiamethoxam induced depressed in both arms of immune response as comparing with vaccinated non-treatment animals. The pathological examination revealed that the thiamethoxam induced, necrosis, hypertrophy of hepatocytes with multiple granulomatous lesion scatter in liver parenchyma and these lesions were progressive with period time particularly at 6 weeks post-treatment that showed marked proliferation of hepatocytes. The electron microscope examination to liver section showed lipid droplet, proliferation of mitochondria enlargement in addition to distraction of nuclear membrane and presence facular space, also there was severe hemorrhage in the renal interstitial tissue with inflammatory cells infiltration together with fibrosis of the glomeruli wall. Congestion with inflammatory cells infiltration in the red pulp of spleen, in addition to gliosis in the brain parenchyma was seen .The immunized animals showed mild pathological changes characterized by aggregation of mononuclear cells, The electron microscope to liver section showed normal organelles cell. with lymphoid hyperplasia in the spleen and in subepithelial layer of intestinal mucosa. We concluded that thiamethoxam induced toxopathological changes in the internal organs of mice and stimulated the immune response diminished its toxic effects.