RESUMO
Aim: To evaluate the effect of active T. gondii tachyzoites and its products on the gene expression level of IFN-gammaR1 and IFN-gammaR2 in a murine model
Background: Many studies have shown that the parasite Toxoplasma gondii utilizes different mechanisms to inhibit the function of IFN-gamma, but the parasite effect on the function of IFN-gammaR1 and IFN-gammaR2 is still unclear
Patients and methods: Toxoplasma lysate product [TLP], excretory/secretory products [ESPs] obtained from cell free and cell culture media as well as active tachyzoites were injected separately to their respective group each consisted of 10 BALB/c mice. One control group of 10 mice received phosphate buffered saline [PBS]. All of the mice were euthanized three days after the last injection and then their peritoneal leukocytes were harvested separately. The total RNA was extracted from the samples, converted to cDNA, and the gene expression level of IFN-gammaR1 and IFN-gammaR2 was assessed in all of the treated groups relative to the control one
Results: There was no significant difference between each of the treated groups relative to the control group concerning the gene expression level of IFN-gammaR2 [P> 0.05]. Furthermore, the gene expression level of IFN-gammaR1 in two groups of TLP [P= 0.04] and ESP obtained from cell free medium [P= 0.008] showed a significant difference relative to the control group
Conclusion: Findings of this study revealed a new aspect of host-T. gondii interaction in that this parasite is able to downregulate IFN-gammaR1 to reduce the IFN-gamma effects on the infected cell