Clorsulon - CAS 60200-06-8
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Not Intended for Therapeutic Use. For research use only.
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Clorsulon is used in the treatment of Fasciola hepatica infections in calves and sheep.
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1.Metabolic Enzymes of Helminth Parasites: Potential as Drug Targets.
Timson DJ1. Curr Protein Pept Sci. 2016;17(3):280-95.
Metabolic pathways that extract energy from carbon compounds are essential for an organism's survival. Therefore, inhibition of enzymes in these pathways represents a potential therapeutic strategy to combat parasitic infections. However, the high degree of similarity between host and parasite enzymes makes this strategy potentially difficult. Nevertheless, several existing drugs to treat infections by parasitic helminths (worms) target metabolic enzymes. These include the trivalent antimonials that target phosphofructokinase and Clorsulon that targets phosphoglycerate mutase and phosphoglycerate kinase. Glycolytic enzymes from a variety of helminths have been characterised biochemically, and some inhibitors identified. To date none of these inhibitors have been developed into therapies. Many of these enzymes are externalised from the parasite and so are also of interest in the development of potential vaccines. Less work has been done on tricarboxylic acid cycle enzymes and oxidative phosphorylation complexes.
2.[New drugs for horses and production animals in 2011].
Emmerich IU1. Tierarztl Prax Ausg G Grosstiere Nutztiere. 2012 Oct 17;40(5):301-8.
In 2011, three newly developed active pharmaceutical ingredients for horses and food producing animals were released on the German market for veterinary drug products. Two of these new products represent different drug classes of antibiotics, the polypeptide antibiotic Bacitracin (Bacivet™) and the macrolide antibiotic Clorsulon (Levatum®). The third product represents an anticestodal antiparasitic (Tildipirosin, Zuprevo®). Furthermore, three established veterinary active pharmaceutical ingredients were modified to allow their application for additional species. Thus the nonsteroidal anti-inflammatory drug sodium salicylate is now additionally authorised for turkeys and both the macrolide antibiotic Tilmicosin and the anticoccidial drug Toltrazuril are currently available for sheep. Additionally, two veterinary drugs with a new formulation as well as a veterinary drug for horses and food producing animals with a resourceful new combination of active pharmaceutical ingredients have recently been released.
3.In vitro efficacy of triclabendazole and clorsulon against the larval stage of Echinococcus multilocularis.
Richter D1, Richter J, Grüner B, Kranz K, Franz J, Kern P. Parasitol Res. 2013 Apr;112(4):1655-60. doi: 10.1007/s00436-013-3321-7. Epub 2013 Feb 28.
Alveolar echinococcosis (AE) caused by the cestode Echinococcus multilocularis (E. multilocularis) is endemic in wide areas of the Northern hemisphere. Untreated AE progresses and leads to death in more than 90% of cases. Until the advent of benzimidazoles, no antihelminthic drugs were available to cure AE. Benzimidazoles have greatly improved the prognosis of patients with AE. However, benzimidazoles have only a parasitostatic effect on E. multilocularis. Albendazole (ABZ) must sometimes be withdrawn because of adverse events. Alternative drugs are urgently needed. The antihelminthic triclabendazole (TCZ) and clorsulon (CLS) are more effective than ABZ to cure infections by the liver flukes Fasciola spp. The efficacy of TCZ and CLS was investigated on an in vitro culture of E. multilocularis larval tissue. E. multilocularis vesicles were evaluated for their morphology before and after adding TCZ, TCZ sulfoxide (TCZSX) and CLS to the larval tissue culture.
4.Intraspecific mitochondrial DNA variation of Fasciola hepatica eggs from sheep with different level of anthelmintic resistance.
Martínez-Valladares M1, Rojo-Vázquez FA. Parasitol Res. 2014 Jul;113(7):2733-41. doi: 10.1007/s00436-014-3934-5. Epub 2014 May 16.
In the current study, Fasciola hepatica strains of sheep with different degrees of resistance to anthelmintics were analyzed by sequencing the cytochrome C oxidase (COX1) and the NADH dehydrogenase (NAD1) subunits. The strains were as follows: LS, susceptible to all drugs tested; CS, resistant to albendazole and triclabendazole; and SV, resistant to albendazole and clorsulon. The molecular characterization was done in eggs recovered from sheep infected by LS and CS. In relation to SV, eggs were recovered before (SV0) and after a treatment with albendazole (SVA) and clorsulon (SVC). Nested PCRs were carried out to amplify a fragment of 798 bp of the COX1 subunit and 870 bp of the NAD1 subunit. The pairwise sequence identity between eggs was analyzed for each strain. Population diversity indices, neutrality indices, and the degree of gene flow among the strains were evaluated. As a result, we have shown that there was homogeneity in the demographic expansion of the studied strains, and, according to the pairwise fixation index, these were not genetically differentiated.
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CAS 60200-06-8 Clorsulon

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