Influence of Chlorine or Fluorine Substitution on the Estrogenic Properties of 1-Alkyl-2,3,5-tris(4-hydroxyphenyl)-1H-pyrroles
摘要:
In continuation of Our previous work, several 1- alkyl-2,3,5-tris(4-hydroxyphenyl)aryl-1H-pyrroles with chlor-Me or fluorine substituents in the aryl residues were synthesized and tested for estrogen receptor (ER) binding at isolated ER alpha/ER beta. receptors (HAP assay), and. in trans activation assays using ER alpha-positive MCF-7/2a as well as U2-OS/ER alpha and U2-OS/ER beta cells. In the competition experiment at ER alpha the compounds displayed very high relative binding-affinities of up to 37% (determined for 8m) but with restricted subtype selectivity (e.g., ER alpha/ER beta (8ma) = 9). The highest estrogenic potency in ER alpha-positive MCP-7/2a cells was determined for 2,3,5-tris(2-fluoro-4-hydroxyphenyl)-1-prolayl-1H-pyriole 8m (EC50 = 23 nM), while in U2-OS/ER alpha cells 2-(2-fluoro-4-hydroxyphenyl)-3,5-bis(4-hydroxyphenyl)-1H propyl-1H pyrrole 8b (EC50 = 0.12 nM) was the Most potent agonist, only 30 fold less active than estradiol (E2, EC50 = 0.004 nM). In U2-OS/ER beta cells for all pyrroles no transactivation could be observed, which indicates that they are selective ER alpha agonists in Cellular systems.
Influence of Chlorine or Fluorine Substitution on the Estrogenic Properties of 1-Alkyl-2,3,5-tris(4-hydroxyphenyl)-1H-pyrroles
摘要:
In continuation of Our previous work, several 1- alkyl-2,3,5-tris(4-hydroxyphenyl)aryl-1H-pyrroles with chlor-Me or fluorine substituents in the aryl residues were synthesized and tested for estrogen receptor (ER) binding at isolated ER alpha/ER beta. receptors (HAP assay), and. in trans activation assays using ER alpha-positive MCF-7/2a as well as U2-OS/ER alpha and U2-OS/ER beta cells. In the competition experiment at ER alpha the compounds displayed very high relative binding-affinities of up to 37% (determined for 8m) but with restricted subtype selectivity (e.g., ER alpha/ER beta (8ma) = 9). The highest estrogenic potency in ER alpha-positive MCP-7/2a cells was determined for 2,3,5-tris(2-fluoro-4-hydroxyphenyl)-1-prolayl-1H-pyriole 8m (EC50 = 23 nM), while in U2-OS/ER alpha cells 2-(2-fluoro-4-hydroxyphenyl)-3,5-bis(4-hydroxyphenyl)-1H propyl-1H pyrrole 8b (EC50 = 0.12 nM) was the Most potent agonist, only 30 fold less active than estradiol (E2, EC50 = 0.004 nM). In U2-OS/ER beta cells for all pyrroles no transactivation could be observed, which indicates that they are selective ER alpha agonists in Cellular systems.