Intensity of lipid peroxidation processes in the blood of dogs infected with the causative agent of toxocariasis

Gastrointestinal helminthiasis, particularly toxocarosis, is the most common invasive disease of dogs in our country and abroad. It is important to note that toxocarosis is a zoonosis that poses a threat not only to animals but also to humans. It is known that one of the manifestations of the toxic effect of toxocar byproducts is the activation of the processes of peroxide oxidation of cell membrane lipids. Lipid peroxidation is one of the most essential oxidation processes in the body of dogs. Currently, this process is considered one of the leading causes of cell damage and death due to the negative effect of reactive oxygen species. Any sufficiently powerful impact on the animal body, including the development of toxocarosis, can initiate lipid peroxidation processes. That is why the work aimed to determine the effect of toxocarosis infestation on the level of intermediate and final products of lipid peroxide oxidation in the body of dogs. 12 dogs aged two to four months were used for experimental research, and two groups of six animals each were formed: control and experimental. Puppies of the control group were clinically healthy. Puppies of the research group were experimentally infected with the causative agent of toxocarosis at a dose of 5,000 invasive T. canis eggs per kg of body weight. The development of toxocarosis in dogs leads to a significant and probable (P < 0.001) accumulation in the blood of dogs in all periods of the study of the content of intermediate (diene conjugates) and final (TBK-active products) products of lipid peroxidation. In dogs with experimental toxocarosis, an increase in these LPO products was established, especially on the 28th and 35th days of the experiment, where, accordingly, the level of diene conjugates ranged from 0.750 ± 0.004 to 0.675 ± 0.003 odA/ml (Р < 0.001), and the level of TBC-active products - in the range of 38.38 ± 0.174 – 38.18 ± 0.137 μmol/l (Р < 0.001). These changes may be because, in the pathogenesis of toxocariasis in dogs, an important role is played by the increased formation of reactive oxygen species, which subsequently cause a disturbance in the balance between the content of oxidants and antioxidants in the body of dogs. It is also worth paying attention to more significant changes in the level of intermediate POL products in dogs' blood during experimental toxocarosis compared to the final products.