17β-Hydroxysteroid dehydrogenase
17β-Hydroxysteroid dehydrogenase | |||||||||
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Identifiers | |||||||||
EC no. | 1.1.1.51 | ||||||||
CAS no. | 9015-81-0 | ||||||||
Databases | |||||||||
IntEnz | IntEnz view | ||||||||
BRENDA | BRENDA entry | ||||||||
ExPASy | NiceZyme view | ||||||||
KEGG | KEGG entry | ||||||||
MetaCyc | metabolic pathway | ||||||||
PRIAM | profile | ||||||||
PDB structures | RCSB PDB PDBe PDBsum | ||||||||
Gene Ontology | AmiGO / QuickGO | ||||||||
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17β-Hydroxysteroid dehydrogenases (17β-HSD, HSD17B) (EC 1.1.1.51), also 17-ketosteroid reductases (17-KSR), are a group of alcohol oxidoreductases which catalyze the reduction of 17-ketosteroids and the dehydrogenation of 17β-hydroxysteroids in steroidogenesis and steroid metabolism.[1][2][3][4][5] This includes interconversion of DHEA and androstenediol, androstenedione and testosterone, and estrone and estradiol.[6][7]
The major reactions catalyzed by 17β-HSD (e.g., the conversion of androstenedione to testosterone) are in fact hydrogenation (reduction) rather than dehydrogenation (oxidation) reactions.
Reactions
17β-HSDs have been known to catalyze the following redox reactions of sex steroids:
- 20α-Hydroxyprogesterone ↔ Progesterone
- DHEA ↔ Androstenediol
- Androstenedione ↔ Testosterone
- Dihydrotestosterone ↔ 5α-Androstanedione / 3α-Androstanediol / 3β-Androstanediol
- Estrone ↔ Estradiol
- 16α-Hydroxyestrone ↔ Estriol
Activity distribution
Genes
Genes coding for 17β-HSD include:
- HSD17B1: Referred to as "estrogenic". Major subtype for activation of estrogens from weaker forms (estrone to estradiol and 16α-hydroxyestrone to estriol). Catalyzes the final step in the biosynthesis of estrogens. Highly selective for estrogens; 100-fold higher affinity for estranes over androstanes. However, also catalyzes the conversion of DHEA into androstenediol.[10] Recently, has been found to inactivate DHT into 3α- and 3β-androstanediol.[10][11] Expressed primarily in the ovaries and placenta but also at lower levels in the breast epithelium.[12][10] Major isoform of 17β-HSD in the granulosa cells of the ovaries.[13] Mutations and associated deficiency have not been reported in humans.[14] Knockout mice show altered ovarian sex steroid production, normal puberty, and severe subfertility due to defective luteinization and ovarian progesterone production.[15]
- HSD17B2: Describable as "antiestrogenic" and "antiandrogenic".[16] Major subtype for inactivation of estrogens and androgens into weaker forms (estradiol to estrone, testosterone to androstenedione, and androstenediol to DHEA). Also converts inactive 20α-hydroxyprogesterone into active progesterone. Preferential activity on androgens. Expressed widely in the body including in the liver, intestines, lungs, pancreas, kidneys, endometrium, prostate, breast epithelium, placenta, and bone.[10][17][12] Said to be responsible for 17β-HSD activity in the endometrium and placenta.[18] Mutations and associated congenital deficiency have not been reported in humans.[14] However, local deficiency in expression of HSD17B2 has been associated with endometriosis.[19]
- HSD17B3: Referred to as "androgenic". Major subtype in males for activation of androgens from weaker forms (androstenedione to testosterone and DHEA to androstenediol). Also activates estrogens from weaker forms to a lesser extent (estrone to estradiol). This is essential for testicular but not ovarian production of testosterone. Not expressed in the ovaries, where another 17β-HSD subtype, likely HSD17B5, is expressed instead. Mutations are associated with 17β-HSD type III deficiency. Males with this condition have pseudohermaphroditism, while females are normal with normal androgen and estrogen levels.[17][12]
- HSD17B4: Also known as D-bifunctional protein (DBP). Involved in fatty acid β-oxidation and steroid metabolism (specifically estrone to estradiol, for instance in the uterus).[20] Mutations are associated with DBP deficiency and Perrault syndrome (ovarian dysgenesis and deafness).[20]
- HSD17B5: Also known as aldo-keto reductase 1C3 (AKR1C3). Has 3α-HSD and 20α-HSD activity in addition to 17β-HSD activity. Expressed in the adrenal cortex and may act as the "androgenic" 17β-HSD in ovarian thecal cells. Also expressed in the prostate gland, mammary gland, and Leydig cells.[12]
- HSD17B6: Has 3α-HSD activity and catalyzes conversion of the weak androgen androstanediol into the powerful androgen dihydrotestosterone in the prostate gland. May be involved in the pathophysiology of PCOS .[12]
- HSD17B7: Is involved in cholesterol metabolism but is also thought to activate estrogens (estrone to estradiol) and inactivate androgens (dihydrotestosterone to androstanediol).[12] Expressed in the ovaries, breasts, placenta, testes, prostate gland, and liver.[12]
- HSD17B8: Inactivates estradiol, testosterone, and dihydrotestosterone, though can also convert estrone into estradiol. Expressed in the ovaries, testes, liver, pancreas, kidneys, and other tissues.[21][22]
- HSD17B9: Also known as retinol dehydrogenase 5 (RDH5). Involved in retinoid metabolism.[23] Mutations are associated with fundus albipunctatus.[24]
- HSD17B10: Also known as 2-methyl-3-hydroxybutyryl-CoA dehydrogenase (MHBD). Substrates include steroids, neurosteroids, fatty acids, bile acids, isoleucine, and xenobiotics.[25][26] Mutations are associated with 17β-HSD type X deficiency (also known as HSD10 disease or MHBD deficiency) and mental retardation, X-linked, syndromic 10 (MRXS10), which are characterized by neurodegeneration and mental retardation, respectively.[25][26]
- HSD17B11
- HSD17B12
- HSD17B13
- HSD17B14
At least 7 of the 14 isoforms of 17β-HSD are involved in interconversion of 17-ketosteroids and 17β-hydroxysteroids.[12]
Overview
# | Gene name | Synonyms | Family | Size (AA ) | Gene location | Cellular location | Substrate specificities | Preferred cofactor | Catalytic preference | Tissue distribution | Expression profile | Pathology |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | HSD17B1 | SDR | 328 | 17q21.2 | Cytosol | Estrogens | NADH, NADPH | Reduction | Ovary, endometrium, breast, brain, prostate, placenta | Strongly restricted | Breast cancer, prostate cancer, endometriosis | |
2 | HSD17B2 | SDR | 387 | 16q23.3 | ER | Estrogens, androgens, progestogens | NAD+ | Oxidation | Liver, intestine, endometrium, placenta, pancreas, prostate, colon, bone | Selectively distributed | Breast cancer, prostate cancer, endometriosis, osteoporosis[31] | |
3 | HSD17B3 | SDR | 310 | 9q22.32 | ER | Androgens | NADPH | Reduction | Testis, ovary, blood, saliva, skin, adipose tissue, brain, bone | Strongly restricted | 17β-HSD3 deficiency, prostate cancer[32] | |
4 | HSD17B4 | DBP, MFP2 | SDR | 736 | 5q23.1 | PXS | Fatty acids, bile acids, estrogens, androgens | NAD+ | Oxidation | Liver, heart, prostate, testis, lung, skeletal muscle, kidney, pancreas, thymus, ovary, intestine, placenta, brain, spleen, colon, lymphocytes | Ubiquitous | DBP deficiency, Perrault syndrome, prostate cancer |
5 | AKR1C3 | HSD17B5, PGFS | AKR | 323 | 10p15.1 | Nucleus, cytosol | Androgens, progestogens, estrogens, prostaglandins | NADPH | Reduction | Prostate, mammary gland, liver, kidney, lung, heart, small intestine, colon, uterus, testis, brain, skeletal muscle, adipose tissue | Nearly ubiquitous | Breast cancer, prostate cancer |
6 | HSD17B6 | SDR | 317 | 12q13.3 | Endosomes | Retinoids, androgens, estrogens | NAD+ | Oxidation | Liver, testis, lung, spleen, brain, ovary, kidney, adrenal, prostate | Selectively distributed | ? | |
7 | HSD17B7 | SDR | 341 | 1q23.3 | PM , ER | Cholesterol, estrogens, androgens, progestogens | NADPH | Reduction | Ovary, corpus luteum, uterus, placenta, liver, breast, testis, brain, adrenal gland, small intestine, lung, thymus, prostate, adipose tissue, others | Widely distributed | Breast cancer | |
8 | HSD17B8 | SDR | 261 | 6p21.32 | MC | Fatty acids, estrogens, androgens | NAD+ | Oxidation | Prostate, placenta, kidney, brain, cerebellum, heart, lung, small intestine, ovary, testis, adrenal, stomach | Widely distributed | Polycystic kidney disease | |
9 | RDH5 | HSD17B9 | 318 | 12q13.2 | ER | Retinoids | NADH/NAD+ | Reduction / oxidation | Retina, liver, adipose tissue, blood, others | ? | Fundus albipunctatus | |
10 | HSD17B10 | MHBD | SDR | 261 | Xp11.2 | MC | Fatty acids, bile acids, estrogens, androgens, progestogens, corticosteroids | NAD+ | Oxidation | Liver, small intestine, colon, kidney, heart, brain, placenta, lung, ovary, testis, spleen, thymus, prostate, peripheral blood leukocytes | Nearly ubiquitous | 17β-HSD10 deficiency, MRXS10 , Alzheimer's disease |
11 | HSD17B11 | SDR | 300 | 4q22.1 | ER, EP | Estrogens, androgens | NAD+ | Oxidation | Liver, pancreas, intestine, kidney, adrenal gland, heart, lung, testis, ovary, placenta, sebaceous gland | Nearly ubiquitous | ? | |
12 | HSD17B12 | SDR | 312 | 11p11.2 | ER | Fatty acids, estrogens, androgens | NADPH | Reduction | Heart, skeletal muscle, liver, kidney, adrenal gland, testis, placenta, cerebellum, pancreas, stomach, small intestine, large intestine, trachea, lung, thyroid, esophagus, prostate, aorta, urinary bladder, spleen, skin, brain, ovary, breast, uterus, vagina | Ubiquitous | ? | |
13 | HSD17B13 | SDR | 300 | 4q22.1 | ER, EP | ? | NAD+? | Oxidation? | Liver, bone marrow, lung, ovary, testis, kidney, skeletal muscle, brain, bladder, nasal epithelia | Strongly restricted | ? | |
14 | HSD17B14 | SDR | 270 | 19q13.33 | Cytosol | Estrogens, androgens, fatty acids | NAD+ | Oxidation | Liver, kidney, brain, gallbladder, breast, adrenal, placenta | Widely distributed | Breast cancer (prognostic) | |
15 | RDH11[33][34][35] | PSDR1, HSD17B15 | SDR | 318 | 14q23-24.3 | ER | Retinoids, androgens | NADPH | Reduction | Retina, prostate, brain, testis | ? | Retinitis pigmentosa[36] |
Clinical significance
Mutations in HSD17B3 are responsible for 17β-HSD type III deficiency.
Inhibitors of 17β-HSD type II are of interest for the potential treatment of osteoporosis.[31][37]
Some inhibitors of 17β-HSD type I have been identified, for example esters of cinnamic acid and various flavones (e.g. fisetin).[38]
See also
References
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External links
- 3(or+17)beta-hydroxysteroid+dehydrogenase at the U.S. National Library of Medicine Medical Subject Headings (MeSH)