Ciclopirox ethanolamine (Ciclopirox olamine, HOE 296) (CAS 41621-49-2) is a broad-spectrum antifungal agent working as an iron chelator.<br />
Ciclopirox significantly inhibits the growth of C. albicans strain SC5314 cells, with MIC<sub>80</sub>s of 1.0-2.0 μg/mL, growth decreased dramatically at the concentrations of >0.6 μg/mL, and almost complete growth inhibition at concentration of 0.7 μg/mL, unlike fluconazole which shows a much wider range of concentrations with intermediate inhibition. Like iron chelator bipyridine, Ciclopirox reduces cell growth by binding to iron ions, which can be reversed by addition of FeCl<sub>3</sub>. Moreover, Ciclopirox treatment at subinhibitory concentration (0.6 μg/mL) only moderately reduces the virulence genes such as genes encoding secreted proteinases or lipases, but leads to a distinct up- or down-regulation of genes encoding iron permeases or transporters (FTR1, FTR2, and FTH1), a copper permease (CCC2), an iron reductase (CFL1), and a siderophore transporter (SIT1). Although the Candida drug resistance genes CDR1 and CDR2 are up-regulated after Ciclopirox treatment, no change in resistance or increased tolerance could be observed even after an incubation period of 6 months, in contrast to fluconazole in which the MICs for cells noticeably increase after 2 months.
Catalog Number | A000713 |
CAS Number | 41621-49-2 |
Synonyms | Ciclopirox ethanolamine; ciclopiroxolamine; Ciclobirox Olamine |
Molecular Formula | C12H17NO2.C2H7NO |
Purity | 95% |
Target | ATPase |
Solubility | Soluble in DMSO > 10 mM |
Storage | 3 years -20C powder |
IUPAC Name | 2-aminoethanol;6-cyclohexyl-1-hydroxy-4-methylpyridin-2-one |
InChI | InChI=1S/C12H17NO2.C2H7NO/c1-9-7-11(13(15)12(14)8-9)10-5-3-2-4-6-10;3-1-2-4/h7-8,10,15H,2-6H2,1H3;4H,1-3H2 |
InChIKey | MBRHNTMUYWQHMR-UHFFFAOYSA-N |
SMILES | CC1=CC(=O)N(C(=C1)C2CCCCC2)O.C(CO)N |
Reference | 1.<span style="font-family: Arial, sans-serif; font-size: 13px; font-variant-ligatures: normal; orphans: 2; widows: 2;">Sigle, Hans-Christian, et al. "Oxygen accessibility and iron levels are critical factors for the antifungal action of ciclopirox against Candida albicans." </span><i style="font-family: Arial, sans-serif; font-size: 13px; font-variant-ligatures: normal; orphans: 2; widows: 2;">Journal of Antimicrobial Chemotherapy</i><span style="font-family: Arial, sans-serif; font-size: 13px; font-variant-ligatures: normal; orphans: 2; widows: 2;"> 55.5 (2005): 663-673.</span> |