Background: Hydatidosis is one of the most important zoonosis disease and represents a major public health and economic burden in many countries. The disease causes by larval stage of Echinococcos Granolosus worm in human and domesticated animals. Immune responses against hydatidosis comprises of various mechanisms of innate and adaptive immunity. In recent years the importance of innate immune responses and in particular, pattern recognition receptors (PRRs) has been recognized as an essential mechanisms for development of an effective immune response. PRRs are the main sensors of pathogen and danger signals in innate immunity. Toll like receptors (TLRs) are the most studied and best characterized PPRs which are responsible for sensing pathogen associated molecular patterns(PAMPs). The role of TLRs in the molecular mechanisms underlying the pathogenesis and immunity in helminths infection has not been clearly defined. Methods: In this study we aimed on the expression levels of two important ovine TLRs transcripts, namely TLR2 and TLR4 in a culture of ovine lymphocytes exposed to different concentrations of hydatid fluid antigens in a time point experiments. Blood samples were taken from healthy young lambs. After isolation of peripheral blood mononuclear cells (PBMC), the cells were cultured with different concentrations (50µg/ml & 100µg/ml) of hydatid fluid antigens (antigens were extracted and concentrated according to the standard protocols), in different time points. Then, total RNA was isolated from the cell pellets and cDNA was synthesized using Oligo dT primers.Afterwards, the primer pairs for TLR2, TLR4 as target genes and GAPDH as housekeeping and calibrator gene were optimized in a gradient RT-PCR experiment. Subsequently, qPCR analysis was set up to quantify and compare the relative expression levels of TLR2 and TLR4 transcripts in PBMC of antigen treated versus control(untreated) samples. Results: Gene expression analysis showed down-regulation of TLR2 and TLR4 transcripts in treated as compared to the untreated control group which might indicate the presence of Immunosuppressive components in Hydatid fluid antigens. Conclusion: the results presented in this study, can shed more lights to the insight mechanisms behind the molecular immuopathogenesis of hydatidosis which might eventually pave the way for designing novel and more effective therapeutic as well as preventive strategies.

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