From Wikipedia, the free encyclopedia
Classification of estrogens and antiestrogens by receptor–estrogen complex retention
Class Examples RE complex retention Pharmacodynamic profile Uterine effects
Short-acting (a.k.a.
"weak" or "impeded")
Estriol • 16-Epiestriol • 17α-Estradiol • ent-Estradiol • 16-Ketoestradiol • Dimethylstilbestrol • meso-Butestrol Short (1–4 hours) Single or once-daily injections: partial agonist or antagonist Early responsesa
Implant or multiple injections per day: full agonist Early and late responsesb
Long-acting A. Estradiol • Estrone • Ethinylestradiol • Diethylstilbestrol • Hexestrol Intermediate (6–24 hours) Single or once-daily injections: full agonist Early and late responses
B. Clomifene • Nafoxidine • Nitromifene • Tamoxifen Long (>24–48 hours) Single injection: agonist
Repeated injections: antagonist
Early and late responses
Footnotes: a = Early responses occur after 0–6 hours and include water imbibition, hyperemia, amino acid and nucleotide uptake, activation of RNA polymerases I and II, and stimulation of induced protein, among others. b = Late responses occur after 6–48 hours and include cellular hypertrophy and hyperplasia and sustained RNA polymerase I and II activity, among others. Sources: [1] [2] [3] [4] [5] [6] [7]
From Wikipedia, the free encyclopedia
Classification of estrogens and antiestrogens by receptor–estrogen complex retention
Class Examples RE complex retention Pharmacodynamic profile Uterine effects
Short-acting (a.k.a.
"weak" or "impeded")
Estriol • 16-Epiestriol • 17α-Estradiol • ent-Estradiol • 16-Ketoestradiol • Dimethylstilbestrol • meso-Butestrol Short (1–4 hours) Single or once-daily injections: partial agonist or antagonist Early responsesa
Implant or multiple injections per day: full agonist Early and late responsesb
Long-acting A. Estradiol • Estrone • Ethinylestradiol • Diethylstilbestrol • Hexestrol Intermediate (6–24 hours) Single or once-daily injections: full agonist Early and late responses
B. Clomifene • Nafoxidine • Nitromifene • Tamoxifen Long (>24–48 hours) Single injection: agonist
Repeated injections: antagonist
Early and late responses
Footnotes: a = Early responses occur after 0–6 hours and include water imbibition, hyperemia, amino acid and nucleotide uptake, activation of RNA polymerases I and II, and stimulation of induced protein, among others. b = Late responses occur after 6–48 hours and include cellular hypertrophy and hyperplasia and sustained RNA polymerase I and II activity, among others. Sources: [1] [2] [3] [4] [5] [6] [7]

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