Abstract
Disruption of GABAergic signaling could exaggerate the inflammatory reaction associated with Toxoplasma gondii infection, as well as produce neurophysiological consequences including seizures that occur within the brain tissues. The current study aimed to evaluate the efficacy of ivermectin (IVM) in treating latent cerebral toxoplasmosis and define its role in the neuromodulation of cerebral tissue GABA expression, conducted in an immunocompromised dexamethasone-treated mouse model infected with the ME49 Toxoplasma strain. The control (non-infected non-treated) group showed a mean of 22.1 ± 0.71 for local expression of GABA. Significantly lower expression (3.78 ± 1.38) was recorded in the infected non-treated group (p ≤ 0.05). On the contrary, a significantly higher expression was reported in the group infected and treated with IVM than in the infected non-treated group (19.8 ± 0.8). While the infected spiramycin (SP)-treated group reported a significantly lower level than the control. Non-infected groups that received only IVM or SP recorded 22.3 ± 0.45 and 22 ± 0.89 respectively with no significant difference. IVM is shown in this work, not only to reduce the size and the number of Toxoplasma cystic lesions within the brain significantly with a reduction rate of 68.85% but to also increase the level of GABA local expression significantly in addition to improving cerebral histopathology. Thus, IVM by its ability to modulate GABA expression may improve such clinical situations, if used as a treatment either exclusively or in combination with other medications.
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