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Neural injections of Bromodeoxyuridine (BrdU) were applied to males of both groups to test for neurogenesis . Analysis showed that testosterone and dihydrotestosterone regulated adult hippocampal neurogenesis (AHN). Adult hippocampal neurogenesis was regulated through the androgen receptor in the wild-type male rats, but not in the TMF male rats. To further test the role of activated androgen receptors on AHN, flutamide , an antiandrogen drug that competes with testosterone and dihydrotestosterone for androgen receptors , and dihydrotestosterone were administered to normal male rats. Dihydrotestosterone increased the number of BrdU cells, while flutamide inhibited these cells.
Estradiol's efficacy seems to vary widely with the person and the particular vehicle: I was on transdermal patches for two years ( , 2 patches changed twice weekly – considered a "high" dose of 17-beta estradiol), and my levels mostly stayed around 100 pg/mL, and I needed 100mg spironolactone daily to keep my testosterone down. When I switched to injections of Estradiol Valerate, as I was "titrating up" my testosterone was unmeasurably low at the same E2 level my patches were delivering. (I had decided to drop spiro at the same time due to it's side effects: for me it seemed to be fogging my brain and inducing suicidal ideation.) Increasing the dosage had the effect of adding a cup-size to my breasts after about two months of injections, after two years of HRT, at age 53 and with b-cup breasts already. This story is not unusual in the community, and it led me to try this form of HRT.