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PubMed1950

[Anthelmintics].

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Anthelmintics↗
PubMed1986

Synthesis and anthelmintic activity of 2,2'-disubstituted 5,5'-dibenzimidazolylsulfides and sulfones.

A number of substituted diphenylsulfides and sulfones (4-11) and 2,2'-disubstituted-5,5'-dibenzimidazolyl sulfides and sulphones (12-19) have been synthesized starting from 5-chloro-2-nitroacetanilide and (3) 4,4'-dichlorodiphenyl sulfone (9), respectively. Among the compounds tested against Ancylostoma ceylanicum in hamsters and Hymenolepis nana in rats and mice, 14, 15, 18 and 19 removed 100% of the worms at an oral dose of 25 mg/kg X 1 to 250 mg/kg X 3. Some of the compounds were tested for their blood schizontocidal activity against Plasmodium berghei in mice but none showed any activity up to an oral dose of 10 mg/kg given for 6 days.

Ancylostomatoidea↗
PubMed1996

Structural requirements for the induction of cytochromes P450 by benzimidazole anthelmintic derivatives in cultured rabbit hepatocytes.

The effect of sulfur-containing benzimidazoles (thiabendazole, 5-hydroxy-thiabendazole, cambendazole) and sulfur-free derivatives (benzimidazole, carbendazim and 5-hydroxycarbendazim) on cytochrome P450 enzymes was investigated in primary cultures of rabbit hepatocytes considered 72 h after plating. Thiabendazole, cambendazole and carbendazim led to a significant dose-dependent increase in both EROD activity and cytochrome P4501A1/2 proteins and mRNA expression. Experiments using actinomycin D strongly suggest that these compounds have a transcriptional control on both CYP1A1 and CYP1A2 genes in primary hepatocytes. Thiabendazole increased both COH activity and P4502A protein levels. We conclude that sulfur is not a prerequisite to the P450 induction potential of benzimidazoles, while 5-hydroxylation leads to inefficient metabolites in terms of inducibility.

Animals↗