Abstract
Deltamethrin (DLM) is a newer kind of insecticide that is used on pets, livestock, and crops, as well as to combat malaria vectors and household pests. It belongs to the synthetic pyrethroid group and is being promoted as an alternative to organophosphate chemicals due to its persistent and destructive effects. The current study aimed to evaluate the impact of sub-chronic oral exposure to DLM on autoimmune activity in rats. Three groups of male albino rats (15 rats/group) including the control group, the ethanol-treated group (1 ml/rat), and the DLM-treated group (5 mg/kg b.w). Samples of blood were taken from all groups at 4-, 8- and 12-week intervals for the determination of hematological, cytokines, and immunological parameters. T lymphocyte subsets and Treg lymphocytes were determined in serum using flow cytometric acquisition. The results revealed that DLM significantly increased TNF-α, IL-33, IL-6, IL-17, IgG, IgM, WBCs, differential count, and platelets while decreasing Hb concentration and RBCs. Additionally, DLM decreased the number of T-cell subsets (CD3, CD4, CD5, and CD8) and Treg lymphocytes. All of these impacts became more severe over time. It is possible to conclude that the sub-chronic oral exposure to DLM disturbed autoimmune activity through the disturbances in immunological indices, CDs subset Treg lymphocytes.
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