Lipoidal estradiol
[1][2] Relative to estradiol, they have far longer-lasting durations of effect due to their much slower rates of metabolism and clearance.[1][2] It has been hypothesized that LE2 may serve as a store of estrogen for when estradiol levels become low.[1][2] LE2 are highly lipophilic and hydrophobic and are found in highest concentrations in adipose tissue and other estrogen-sensitive tissues and in low but detectable concentrations in circulation, with none excreted in urine.[1][2] They have been referred to as the "endogenous counterparts of the synthetic esters of estrogens" like estradiol valerate and estradiol cypionate.[3][4] Estradiol is esterified into LE2 by lecithin–cholesterol acyltransferase (LCAT).
Estradiol stearateendogenousfatty acidestersestradiolmetabolitesestradiol palmitateestrogensestrogen receptorprohormonesmetabolismclearancelipophilichydrophobicadipose tissuecirculationexcretedestradiol valerateestradiol cypionatemedical useintramuscular injectionlecithin–cholesterol acyltransferaseCatechol estrogenEstradiol undecylateEstrogen conjugateSteroid sulfateBibcodesteroidsPrecursorsCholesterol22R-Hydroxycholesterol20α,22R-DihydroxycholesterolPregnenolone17α-Hydroxypregnenolone21-HydroxypregnenoloneCorticosteroidsGlucocorticoids3α,5α-Tetrahydrocorticosterone5α-Dihydrocorticosterone11-Deoxycorticosterone11-Deoxycortisol11-Ketoprogesterone21-Deoxycortisol21-DeoxycortisoneCorticosteroneCortisolCortisone17α-HydroxyprogesteroneProgesterone5α-DihydrocortisolMineralocorticoids5α-Dihydroaldosterone11-Dehydrocorticosterone (11-oxocorticosterone, 17-deoxycortisone)11β-Hydroxyprogesterone (21-deoxycorticosterone)18-Hydroxy-11-deoxycorticosterone18-HydroxycorticosteroneAldosteroneSex steroidsAndrogens11-Ketodihydrotestosterone11-Ketotestosterone7β-Hydroxyepiandrosterone11β-HydroxyandrostenedioneAdrenosterone (11-ketoandrostenedione)AndrostenediolAndrostenedioneAndrosteroneDehydroandrosteroneDHEA sulfateDihydrotestosteroneEpiandrosteroneEpitestosterone16α-Hydroxyandrostenedione16α-Hydroxy-DHEA16α-Hydroxy-DHEA sulfateTestosterone3α-Androstanediol3α-Androstanediol glucuronide3β-Androstanediol5β-Dihydrotestosterone3α-Etiocholanediol3β-EtiocholanediolAndrostenediol sulfateAndrostenetriolAndrosterone glucuronideAndrosterone sulfateEtiocholanedioneEtiocholanoloneEtiocholanolone glucuronideEpietiocholanoloneTestosterone glucuronideTestosterone sulfateEstetrolEstroneEstriol17α-Estradiol16β-Epiestriol (16β-hydroxyestradiol)17α-Epiestriol (16α-hydroxy-17α-estradiol)16β,17α-Epiestriol (16β-hydroxy-17α-estradiol)2-Hydroxyestradiol2-Hydroxyestriol2-Hydroxyestrone4-Hydroxyestradiol4-Hydroxyestriol4-Hydroxyestrone4-Methoxyestradiol4-Methoxyestrone16α-Hydroxyestrone16β-Hydroxyestrone16-Ketoestradiol16-Ketoestrone27-Hydroxycholesterol4-Androstenedione5-Androstenediol7-Keto-DHEA7α-Hydroxy-DHEA2-Methoxyestradiol2-Methoxyestrone2-Methoxyestriol4-MethoxyestriolEstradiol disulfateEstradiol glucuronideEstradiol 3-glucuronideEstradiol 3-glucuronide 17β-sulfateEstradiol sulfateEstradiol 17β-sulfate