The mechanism is through activation of aromatase. Note the double hit - i.e. noradrenalin both increased the synthesis of estrogen through aromatase AND also decreased DHT synthesis through 5-AR.
http://www.ncbi.nlm.nih.gov/pubmed/6290295
"...NE (10 microM) added to pineal organ cultures increased by 72% the conversion of [14C]testosterone into estradiol and depressed by 39 and 53% that into the 5 alpha-reduced metabolites 5 alpha-dihydrotestosterone (5-DHT) and 5 alpha-androstanediol (5 alpha-diol)."
The study used beta-blockers to negate the effect but I am thinking that clonidine may also work b/c it has been reported to increase libido (a symptom of higher T / DHT) and decrease water retention (a symptom of high estrogen).
http://www.ncbi.nlm.nih.gov/pubmed/6290295
"...NE (10 microM) added to pineal organ cultures increased by 72% the conversion of [14C]testosterone into estradiol and depressed by 39 and 53% that into the 5 alpha-reduced metabolites 5 alpha-dihydrotestosterone (5-DHT) and 5 alpha-androstanediol (5 alpha-diol)."
The study used beta-blockers to negate the effect but I am thinking that clonidine may also work b/c it has been reported to increase libido (a symptom of higher T / DHT) and decrease water retention (a symptom of high estrogen).