Rivelilson Mendes de Freitas

Rivelilson Mendes de Freitas

Federal University of Piaui, Brazil

Title: Antischistosomal Activity of an Aromatic Diamidine against Schistosomamansoni Adult Worms


Rivelilson Mendes de Freitas has Master and PhD degree in Pharmacology atthe Federal University of Ceará. Postdoctoral fellow at the Faculty of Pharmacy of University of Coimbra and at the Redox Biology in Health and Disease Research Group of the Centre of Neurosciences and Cell Biology. Currently, he is Adjunct professor III of Undergraduate Course in Pharmacy and Vice Coordinator of the Graduate Program in Pharmaceutical Sciences of the Federal University of Piauí (UFPI).


The present study reports the antischistosomal activity of a molecular entity of synthetic origin and derived from diminazene in an experimental in vitromodel against Schistosomamansoni.This derivative of diminazene is an aromatic diamide that at concentrations of 125, 250 and 500 µg/ml induced a significant reduction in the motor activity and high mortality rates of S.mansoni adult worms of both sexes. At concentrations of 125, 250 and 500 µg/ml, the derivative of diminazene caused the death of 100% of adult parasites of S. mansoni of both sexes at the time of 48 hours.Confocal laser scanning microscopyanalysis following flaking and disintegration of tubers studies revealed morphological changes in the tegumental surface of maleS. mansoni worms treated with the aromatic diamide resulting in the disappearance of swollen buttons.Also, it was observed that the derivative of diminazene at concentrations of 62.5, 125 and 250 µg/ml has the capability of reducing by 100% theoviposition when compared with the number of eggs produced by S. mansoni worms ofthe control group.Thus, the present studydescribed thein vitroantischistosomal activity of a compound derived from the diminazene through observations in the mortality rate, reduction in motor activity, alterations in the tegument and oviposition of adultS. mansoni worms.In vivo studies are needed usingthis derivative of diminazene to elucidate its mechanisms of action and to determine its full potential to develop a newantiesquistossomose drug.