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Womens Health Research Institute (H.A.H., Y.P.K., J.M., B.S.K., R.C.W., D.E.F., R.A.H., Y.Z.) and Chemistry and Screening Sciences (R.E.M., C.P.M.), Wyeth Research, Collegeville, Pennsylvania 19426; Cardiovascular and Metabolic Diseases, Wyeth Research (L.M.A., Y.L., J.C.K.), Cambridge, Massachusetts 02140; and Chemistry and Screening Sciences, Wyeth Research (M.S.M.), Monmouth Junction, New Jersey 08852
Address all correspondence and requests for reprints to: Heather A. Harris, Ph.D., Womens Health Research Institute, RN 3256, 500 Arcola Road, Collegeville, Pennsylvania 19426. E-mail: harrish{at}wyeth.com.
The discovery of a second estrogen receptor (ER), called ERß, in 1996 sparked intense interest within the scientific community to discover its role in mediating estrogen action. However, despite more than 6 yr of research into the function of this receptor, its physiological role in mediating estrogen action remains unclear and controversial. We have developed a series of highly selective agonists for ERß and have characterized their activity in several clinically relevant rodent models of human disease. The activity of one such compound, ERB-041, is reported here. We conclude from these studies that ERß does not mediate the bone-sparing activity of estrogen on the rat skeleton and that it does not affect ovulation or ovariectomy-induced weight gain. In addition, these compounds are nonuterotrophic and nonmammotrophic. However, ERB-041 has a dramatic beneficial effect in the HLA-B27 transgenic rat model of inflammatory bowel disease and the Lewis rat adjuvant-induced arthritis model. Daily oral doses as low as 1 mg/kg reverse the chronic diarrhea of HLA-B27 transgenic rats and dramatically improve histological disease scores in the colon. The same dosing regimen in the therapeutic adjuvant-induced arthritis model reduces joint scores from 12 (maximal inflammation) to 1 over a period of 10 d. Synovitis and Mankin (articular cartilage) histological scores are also significantly lowered (5075%). These data suggest that one function of ERß may be to modulate the immune response, and that ERß-selective ligands may be therapeutically useful agents to treat chronic intestinal and joint inflammation.
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