1. Effectiveness of hyperbaric oxygen for experimental treatment of schistosomiasis mansoni using praziquantel-free and encapsulated into liposomes: assay in adult worms and oviposition.
- Author
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Frezza TF, de Souza AL, Prado CC, de Oliveira CN, Gremião MP, Giorgio S, Dolder MA, Joazeiro PP, and Allegretti SM
- Subjects
- Animals, Anthelmintics administration & dosage, Anthelmintics pharmacology, Colon parasitology, Drug Administration Schedule, Drug Carriers administration & dosage, Drug Evaluation, Preclinical, Female, Hyperbaric Oxygenation, Liposomes administration & dosage, Male, Mice, Oviposition drug effects, Oviposition physiology, Parasite Egg Count, Praziquantel administration & dosage, Praziquantel pharmacology, Schistosoma mansoni physiology, Anthelmintics therapeutic use, Praziquantel therapeutic use, Schistosoma mansoni drug effects, Schistosomiasis mansoni drug therapy
- Abstract
The treatment of schistosomiasis depends on a single drug: praziquantel (PZQ). However, this treatment presents limitations such as low and/or erratic bioavailability that can contribute to cases of tolerance. Improvements to the available drug are urgently needed and studies with a controlled system of drug release, like liposomes, have been gaining prominence. The present study evaluated the activity and synergy between liposomal-praziquantel (lip.PZQ) and hyperbaric oxygen therapy (HBO). Mice received doses of 60 or 100mg/kg PZQ or lip.PZQ, 50 days post-infection, and after the treatment, were exposed to HBO (3 atmosphere absolute - ATA) for 1h. The viability of adult worms and oviposition were analyzed, by necropsy and Kato-Katz examination performed after 15 days of treatment. A concentration of 100mg/kg of lip.PZQ+HBO was more effective (48.0% reduction of worms, 83.3% reduction of eggs/gram of feces) and 100% of the mice had altered of oograms (indicating interruption of oviposition) compared to other treatments and to the Control group (infected and untreated). It is known that PZQ requires participation of the host immune system to complete its antischistosomal activity and that HBO is able to stimulate the immune system. The drug became more available in the body when incorporated into liposomes and, used with HBO, the HBO worked as an adjuvant. This explains the decreases of oviposition and worms recovered form hepatic portal system., (Copyright © 2015 Elsevier B.V. All rights reserved.)
- Published
- 2015
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