PT - JOURNAL ARTICLE AU - Elisabetta Galbiati AU - Paola Lorenza Caruso AU - Gabriele Amari AU - Elisabetta Armani AU - Silvia Ghirardi AU - Maurizio Delcanale AU - Maurizio Civelli TI - Effects of 3-Phenyl-4-[[4-[2-(1-piperidinyl)ethoxy]phenyl]methyl]- 2<em>H</em>-1-benzopyran-7-ol (CHF 4056), a Novel Nonsteroidal Estrogen Agonist/Antagonist, on Reproductive and Nonreproductive Tissue AID - 10.1124/jpet.300.3.802 DP - 2002 Mar 01 TA - Journal of Pharmacology and Experimental Therapeutics PG - 802--809 VI - 300 IP - 3 4099 - http://jpet.aspetjournals.org/content/300/3/802.short 4100 - http://jpet.aspetjournals.org/content/300/3/802.full SO - J Pharmacol Exp Ther2002 Mar 01; 300 AB - We have discovered a new, nonsteroidal, estrogen agonist/antagonist, 3-phenyl-4-[[4-[2-(1-piperidinyl)ethoxy]phenyl] methyl]-2H-1-benzopyran-7-ol (CHF 4056). The aim of this study was to determine the effects of CHF 4056 on a series of parameters (body weight, uteri, serum cholesterol, and bones) that were previously shown to be sensitive to estrogens and to selective estrogen receptor modulators (SERMs). CHF 4056 is a benzopyran derivative that binds with high affinity to the human estrogen receptors α and β (dissociation constantKi of 0.041 and 0.157 nM, respectively). In immature rats, CHF 4056 induced a full estrogen antagonism (half-maximal efficacious dose = 0.33 mg/kg·day p.o.) coupled with a lack of uterine stimulatory activity, whereas the structurally related SERM levormeloxifene demonstrated a maximal partial agonist effect of ∼65% that of 17α-ethynyl estradiol (EE2). In ovariectomized (OVX) rats, CHF 4056 (0.1–1 mg/kg·day p.o. for 4 weeks) significantly reduced OVX-induced bone loss in the lumbar spine L1–4 and OVX-induced increase in serum osteocalcin. These protective effects on bone tissue were comparable with those of 0.1 mg/kg·day EE2. In the same experimental conditions, serum cholesterol was significantly lower in the CHF 4056-treated animals, compared with vehicle-treated OVX rats. In line with the results observed in immature rats, also in OVX rats CHF 4056 diverged dramatically from EE2 and levormeloxifene in its lack of significant estrogenic effects on uterine tissue. In conclusion, CHF 4056 is a new SERM that produces beneficial effects on bone and cholesterol levels, while maintaining antagonist effects on the uterus. The American Society for Pharmacology and Experimental Therapeutics