Estrone sulfate

Estrone sulfate, also known as E1S, E1SO4 and estrone 3-sulfate, is a natural, endogenous steroid and an estrogen ester and conjugate.[1][2][3]

This article is about estrone sulfate as a hormone. For its use as a medication, see Estrone sulfate (medication).

Estrone sulfate
Names
IUPAC name
[(8R,9S,13S,14S)-13-methyl-17-oxo-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthren-3-yl] hydrogen sulfate
Other names
E1S; Oestrone sulfate; Estrone 3-sulfate; Estra-1,3,5(10)-trien-17-one 3-sulfate
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.006.888
EC Number
  • 207-120-4
KEGG
UNII
Properties
C18H22O5S
Molar mass 350.429 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

In addition to its role as a natural hormone, estrone sulfate is used as a medication, for instance in menopausal hormone therapy; for information on estrone sulfate as a medication, see the estrone sulfate (medication) article.

Biological function

E1S itself is biologically inactive, with less than 1% of the relative binding affinity of estradiol for the ERα and ERβ.[3][4] However, it can be transformed by steroid sulfatase, also known as estrogen sulfatase, into estrone, an estrogen.[5] Simultaneously, estrogen sulfotransferases, including SULT1A1 and SULT1E1, convert estrone to E1S, resulting in an equilibrium between the two steroids in various tissues.[1][5] Estrone can also be converted by 17β-hydroxysteroid dehydrogenases into the more potent estrogen estradiol.[1] E1S levels are much higher than those of estrone and estradiol, and it is thought to serve as a long-lasting reservoir for estrone and estradiol in the body.[1][6][7] In accordance, E1S has been found to transactivate the estrogen receptor at physiologically relevant concentrations.[8][9] This was diminished with co-application of irosustat (STX-64), a steroid sulfatase inhibitor, indicating the importance of transformation of estrone sulfate into estrone in the estrogenicity of E1S.[8][9]

Unlike unconjugated estradiol and estrone, which are lipophilic compounds, E1S is an anion and is hydrophilic.[10][11][12] As a result of this, whereas estradiol and estrone are able to readily diffuse through the lipid bilayers of cells, E1S is unable to permeate through cell membranes.[10][11][12] Instead, estrone sulfate is transported into cells in a tissue-specific manner by active transport via organic-anion-transporting polypeptides (OATPs), including OATP1A2, OATP1B1, OATP1B3, OATP1C1, OATP2B1, OATP3A1, OATP4A1, and OATP4C1, as well as by the sodium-dependent organic anion transporter (SOAT; SLC10A6).[11][12][13][14]

E1S, serving as a precursor and intermediate for estrone and estradiol, may be involved in the pathophysiology of estrogen-associated diseases including breast cancer, benign breast disease, endometrial cancer, ovarian cancer, prostate cancer, and colorectal cancer.[1][15][16] For this reason, enzyme inhibitors of steroid sulfatase and 17β-hydroxysteroid dehydrogenase and inhibitors of OATPs, which prevent activation of E1S into estrone and estradiol, are of interest in the potential treatment of such conditions.[1][16][15]

Affinities and estrogenic potencies of estrogen esters and ethers at the estrogen receptors
Estrogen Other names RBA (%)a REP (%)b
ER ERα ERβ
Estradiol E2 100 100 100
Estradiol 3-sulfate E2S; E2-3S ? 0.02 0.04
Estradiol 3-glucuronide E2-3G ? 0.02 0.09
Estradiol 17β-glucuronide E2-17G ? 0.002 0.0002
Estradiol benzoate EB; Estradiol 3-benzoate 10 1.1 0.52
Estradiol 17β-acetate E2-17A 31–45 24 ?
Estradiol diacetate EDA; Estradiol 3,17β-diacetate ? 0.79 ?
Estradiol propionate EP; Estradiol 17β-propionate 19–26 2.6 ?
Estradiol valerate EV; Estradiol 17β-valerate 2–11 0.04–21 ?
Estradiol cypionate EC; Estradiol 17β-cypionate ?c 4.0 ?
Estradiol palmitate Estradiol 17β-palmitate 0 ? ?
Estradiol stearate Estradiol 17β-stearate 0 ? ?
Estrone E1; 17-Ketoestradiol 11 5.3–38 14
Estrone sulfate E1S; Estrone 3-sulfate 2 0.004 0.002
Estrone glucuronide E1G; Estrone 3-glucuronide ? <0.001 0.0006
Ethinylestradiol EE; 17α-Ethynylestradiol 100 17–150 129
Mestranol EE 3-methyl ether 1 1.3–8.2 0.16
Quinestrol EE 3-cyclopentyl ether ? 0.37 ?
Footnotes: a = Relative binding affinities (RBAs) were determined via in-vitro displacement of labeled estradiol from estrogen receptors (ERs) generally of rodent uterine cytosol. Estrogen esters are variably hydrolyzed into estrogens in these systems (shorter ester chain length -> greater rate of hydrolysis) and the ER RBAs of the esters decrease strongly when hydrolysis is prevented. b = Relative estrogenic potencies (REPs) were calculated from half-maximal effective concentrations (EC50) that were determined via in-vitro β‐galactosidase (β-gal) and green fluorescent protein (GFP) production assays in yeast expressing human ERα and human ERβ. Both mammalian cells and yeast have the capacity to hydrolyze estrogen esters. c = The affinities of estradiol cypionate for the ERs are similar to those of estradiol valerate and estradiol benzoate (figure). Sources: See template page.

Chemistry
See also: List of estrogens, Estrogen ester, and List of estrogen esters

E1S, also known as estrone 3-sulfate or as estra-1,3,5(10)-trien-17-one 3-sulfate, is a naturally occurring estrane steroid and a derivative of estrone.[17] It is an estrogen conjugate or ester, and is specifically the C3 sulfate ester of estrone.[17] Related estrogen conjugates include estradiol sulfate, estriol sulfate, estrone glucuronide, estradiol glucuronide, and estriol glucuronide, while related steroid conjugates include dehydroepiandrosterone sulfate and pregnenolone sulfate.

The logP of E1S is 1.4.[15]

Biochemistry

Biosynthesis

E1S is produced via estrogen sulfotransferases from the peripheral metabolism of the estrogens estradiol and estrone.[18][19][20] Estrogen sulfotransferases are expressed minimally or not at all in the gonads.[21] In accordance, E1S is not secreted in meaningful amounts from the gonads in humans.[22][18] However, measurable amounts of estrogen sulfates are said to be secreted by the ovaries in any case.[23]

Production rates, secretion rates, clearance rates, and blood levels of major sex hormones
Sex Sex hormone Reproductive
phase		 Blood
production rate		 Gonadal
secretion rate		 Metabolic
clearance rate		 Reference range (serum levels)
SI units Non-SI units
Men Androstenedione
–
 2.8 mg/day 1.6 mg/day 2200 L/day 2.8–7.3 nmol/L 80–210 ng/dL
Testosterone
–
 6.5 mg/day 6.2 mg/day 950 L/day 6.9–34.7 nmol/L 200–1000 ng/dL
Estrone
–
 150 μg/day 110 μg/day 2050 L/day 37–250 pmol/L 10–70 pg/mL
Estradiol
–
 60 μg/day 50 μg/day 1600 L/day <37–210 pmol/L 10–57 pg/mL
Estrone sulfate
–
 80 μg/day Insignificant 167 L/day 600–2500 pmol/L 200–900 pg/mL
Women Androstenedione
–
 3.2 mg/day 2.8 mg/day 2000 L/day 3.1–12.2 nmol/L 89–350 ng/dL
Testosterone
–
 190 μg/day 60 μg/day 500 L/day 0.7–2.8 nmol/L 20–81 ng/dL
Estrone Follicular phase 110 μg/day 80 μg/day 2200 L/day 110–400 pmol/L 30–110 pg/mL
Luteal phase 260 μg/day 150 μg/day 2200 L/day 310–660 pmol/L 80–180 pg/mL
Postmenopause 40 μg/day Insignificant 1610 L/day 22–230 pmol/L 6–60 pg/mL
Estradiol Follicular phase 90 μg/day 80 μg/day 1200 L/day <37–360 pmol/L 10–98 pg/mL
Luteal phase 250 μg/day 240 μg/day 1200 L/day 699–1250 pmol/L 190–341 pg/mL
Postmenopause 6 μg/day Insignificant 910 L/day <37–140 pmol/L 10–38 pg/mL
Estrone sulfate Follicular phase 100 μg/day Insignificant 146 L/day 700–3600 pmol/L 250–1300 pg/mL
Luteal phase 180 μg/day Insignificant 146 L/day 1100–7300 pmol/L 400–2600 pg/mL
Progesterone Follicular phase 2 mg/day 1.7 mg/day 2100 L/day 0.3–3 nmol/L 0.1–0.9 ng/mL
Luteal phase 25 mg/day 24 mg/day 2100 L/day 19–45 nmol/L 6–14 ng/mL
Notes and sources
Notes: "The concentration of a steroid in the circulation is determined by the rate at which it is secreted from glands, the rate of metabolism of precursor or prehormones into the steroid, and the rate at which it is extracted by tissues and metabolized. The secretion rate of a steroid refers to the total secretion of the compound from a gland per unit time. Secretion rates have been assessed by sampling the venous effluent from a gland over time and subtracting out the arterial and peripheral venous hormone concentration. The metabolic clearance rate of a steroid is defined as the volume of blood that has been completely cleared of the hormone per unit time. The production rate of a steroid hormone refers to entry into the blood of the compound from all possible sources, including secretion from glands and conversion of prohormones into the steroid of interest. At steady state, the amount of hormone entering the blood from all sources will be equal to the rate at which it is being cleared (metabolic clearance rate) multiplied by blood concentration (production rate = metabolic clearance rate × concentration). If there is little contribution of prohormone metabolism to the circulating pool of steroid, then the production rate will approximate the secretion rate." Sources: See template.

Distribution

Whereas free steroids like estradiol are lipophilic and can enter cells via passive diffusion, steroid conjugates like E1S are hydrophilic and are unable to do so.[24][25] Instead, steroid conjugates require active transport via membrane transport proteins to enter cells.[24][25]

Studies in animals and humans have had mixed findings on uptake of exogenously administered E1S in normal and tumorous mammary gland tissue.[26][27][28][24][25] This is in contrast to substantial uptake of exogenously administered estradiol and estrone by the mammary glands.[26] Another animal study found that E1S wasn't taken up by the uterus but was taken up by the liver, where it was hydrolyzed into estrone.[29][26]

Metabolism

The elimination half-life of E1S is 10 to 12 hours.[3] Its metabolic clearance rate is 80 L/day/m2.[3]

Ovarian tumors have been found to express steroid sulfatase and have been found to convert E1S into estradiol.[30][31] This may contribute to the often elevated levels of estradiol observed in women with ovarian cancer.[30][31]

Description: The metabolic pathways involved in the metabolism of estradiol and other natural estrogens (e.g., estrone, estriol) in humans. In addition to the metabolic transformations shown in the diagram, conjugation (e.g., sulfation and glucuronidation) occurs in the case of estradiol and metabolites of estradiol that have one or more available hydroxyl (–OH) groups. Sources: See template page.

Levels
Estrogen levels with radioimmunoassay (RIA) around mid-cycle during the normal menstrual cycle in women.[32][33] The vertical dashed line in the center is mid-cycle.

E1S levels have been characterized in humans.[33][34][35] E1S using radioimmunoassay (RIA) have been reported to be 0.96 ± 0.11 ng/mL in men, 0.96 ± 0.17 ng/mL during the follicular phase in women, 1.74 ± 0.32 ng/mL during the luteal phase in women, 0.74 ± 0.11 ng/mL in women taking oral contraceptives, 0.13 ± 0.03 ng/mL in postmenopausal women, and 2.56 ± 0.47 ng/mL in postmenopausal women on menopausal hormone therapy.[35] In addition, E1S levels in pregnant women were 19 ± 5 ng/mL in the first trimester, 66 ± 31 ng/mL in the second trimester, and 105 ± 22 ng/mL in the third trimester.[35] E1S levels are about 10 to 15 times higher than those of estrone in women.[36]

References
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  27. Masamura S, Santner SJ, Santen RJ (July 1996). "Evidence of in situ estrogen synthesis in nitrosomethylurea-induced rat mammary tumors via the enzyme estrone sulfatase". J. Steroid Biochem. Mol. Biol. 58 (4): 425–9. doi:10.1016/0960-0760(96)00065-9. PMID 8903427.
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  31. Kirilovas, Dmitrijus; Schedvins, Kjell; Naessén, Tord; Von Schoultz, Bo; Carlström, Kjell (2009). "Conversion of circulating estrone sulfate to 17β-estradiol by ovarian tumor tissue: A possible mechanism behind elevated circulating concentrations of 17β-estradiol in postmenopausal women with ovarian tumors". Gynecological Endocrinology. 23 (1): 25–28. doi:10.1080/09513590601058333. ISSN 0951-3590.
  32. Pasqualini JR, Gelly C, Nguyen BL (1990). "Metabolism and biologic response of estrogen sulfates in hormone-dependent and hormone-independent mammary cancer cell lines. Effect of antiestrogens". Ann. N. Y. Acad. Sci. 595: 106–16. doi:10.1111/j.1749-6632.1990.tb34286.x. PMID 2375600.
  33. Nuñez M, Aedo AR, Landgren BM, Cekan SZ, Diczfalusy E (November 1977). "Studies on the pattern of circulating steroids in the normal menstrual cycle. 6. Levels of oestrone sulphate and oestradiol sulphate". Acta Endocrinol. 86 (3): 621–33. doi:10.1530/acta.0.0860621. PMID 579025.
  34. Honjo H, Kitawaki J, Itoh M, Yasuda J, Iwasaku K, Urabe M, Naitoh K, Yamamoto T, Okada H, Ohkubo T (1987). "Serum and urinary estrone sulfate during the menstrual cycle, measured by a direct radioimmunoassay, and fate of exogenously injected estrone sulfate". Horm Res. 27 (2): 61–8. doi:10.1159/000180788. PMID 3653846.
  35. Ranadive GN, Mistry JS, Damodaran K, Khosravi MJ, Diamandi A, Gimpel T, Castracane VD, Patel S, Stanczyk FZ (February 1998). "Rapid, convenient radioimmunoassay of estrone sulfate". Clin. Chem. 44 (2): 244–9. doi:10.1093/clinchem/44.2.244. PMID 9474019.
  36. Cowie, Alfred T.; Forsyth, Isabel A.; Hart, Ian C. (1980). "Growth and Development of the Mammary Gland". 15: 58–145. doi:10.1007/978-3-642-81389-4_3. ISSN 0077-1015. Cite journal requires |journal= (help)

Further reading
  • Rezvanpour A, Don-Wauchope AC (March 2017). "Clinical implications of estrone sulfate measurement in laboratory medicine". Critical Reviews in Clinical Laboratory Sciences. 54 (2): 73–86. doi:10.1080/10408363.2016.1252310. PMID 27960570.
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