Efficacy of terbinafine and itraconazole on a experimental model of systemic sporotrichosis

Abstract

Itraconazole is currently considered the drug of choice to treat the diverse clinical presentation of sporotrichosis. On the other hand terbinafine by virtue of its excellent in vitro activity is under comparative evaluation for its therapeutic potential for a wide range of fungal infections. In this study, our aim was to determine the in vivo efficacy of terbinafine and itraconazole on a experimental model of systemic sporotrichosis. 120 rats Wistar received an injection of 2x10 3 S. schenckii cells by via the lateral tail vein. After 3 days the animals were treated with terbinafine (250mg/kg) and itraconazole (100 mg/kg) and their respective diluents. In our model, terbinafine and itraconazole were effective in reducing the number of clinical lesions and positive organ cultures. There was statistical difference between the groups treated with the antifungals in relation to the control groups (p<0,05) concerning the clinical alterations, anatomic-pathological findings and in the positive organ cultures of the agent, being that the treated animals resulted in the absence and/or reduction of all the evaluated parameters. As for the treatments, terbinafine showed similar or higher activity that itraconazole in the evaluation of the testicle alteration (p=0,0004), as well as in the positive organ cultures of microorganism from the organ (p=0,0142). With these results it is possible to conclude that the antifungals studied are effective in the treatment of experimental systemic sporotrichosis.

Current Models to Study the Sporothrix-Host Interaction

“…Rats are a useful model to assess the antifungal activity of compounds against sporotrichosis. Terbinafine and itraconazole have demonstrated effectiveness in reducing clinical lesions in Sporothrix -infected rats, such as nodular and whitish lesions on the spleen, liver, and testicles, suggesting efficacy to treat systemic sporotrichosis (Meinerz et al, 2008 ).…”