Sex hormone-binding globulin

Sex hormone-binding globulin (SHBG) or sex steroid-binding globulin (SSBG) is a glycoprotein that binds to androgens and estrogens. When produced by the Sertoli cells in the seminiferous tubules of the testis, it has also been called androgen-binding protein (ABP).[5][6]

SHBG
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesSHBG, ABP, SBP, TEBG, sex hormone binding globulin, Sex hormone-binding globulin
External IDsOMIM: 182205 MGI: 98295 HomoloGene: 813 GeneCards: SHBG
Orthologs
SpeciesHumanMouse
Entrez

6462

20415

Ensembl

ENSG00000129214

ENSMUSG00000005202

UniProt

P04278

P97497

RefSeq (mRNA)

NM_011367

RefSeq (protein)

NP_035497

Location (UCSC)Chr 17: 7.61 – 7.63 MbChr 11: 69.51 – 69.51 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse
Androgen-binding protein, Sex hormone-binding globulin
Identifiers
SymbolSHBG
Alt. symbolsABP
NCBI gene6462
HGNC10839
OMIM182205
RefSeqNM_001040
UniProtP04278
Other data
LocusChr. 17 p13-p12
Search for
StructuresSwiss-model
DomainsInterPro

Other steroid hormones such as progesterone, cortisol, and other corticosteroids are bound by transcortin. SHBG is found in all vertebrates apart from birds.[7]

Function

Testosterone and estradiol circulate in the bloodstream, loosely bound mostly to serum albumin (~54%), and to a lesser extent bound tightly to SHBG (~44%). Only a very small fraction of about 1 to 2% is unbound, or "free," and thus biologically active and able to enter a cell and activate its receptor. SHBG inhibits the function of these hormones. Thus, the local bioavailability of sex hormones is influenced by the level of SHBG. Because ABP binds to testosterone (T) and dihydrotestosterone (DHT), these hormones are made less lipophilic and become concentrated within the luminal fluid of the seminiferous tubules. The higher levels of these hormones enable spermatogenesis in the seminiferous tubules and sperm maturation in the epididymis. ABP’s production is regulated under the influence of FSH[6] on Sertoli cells, enhanced by insulin, retinol, and testosterone.

The relative binding affinity of various sex steroids for SHBG is dihydrotestosterone (DHT) > testosterone > androstenediol > estradiol > estrone.[8] DHT binds to SHBG with about 5 times the affinity of testosterone and about 20 times the affinity of estradiol.[9] Dehydroepiandrosterone (DHEA) is weakly bound to SHBG, but dehydroepiandrosterone sulfate is not bound to SHBG.[8] Androstenedione is not bound to SHBG either, and is instead bound solely to albumin.[10] Estrone sulfate and estriol are also poorly bound by SHBG.[11] Less than 1% of progesterone is bound to SHBG.[12]

SHBG levels are usually about twice as high in women than in men.[9] In women, SHBG serves to limit exposure to both androgens and estrogens.[9] Low SHBG levels in women have been associated with hyperandrogenism and endometrial cancer due to heightened exposure to androgens and estrogens, respectively.[9] During pregnancy, due to activation of SHBG production in the liver by high estrogen levels, SHBG levels increase by five-fold to ten-fold.[9] The high SHBG levels during pregnancy may serve to protect the mother from exposure to fetal androgens that escape metabolism by the placenta.[9] A case report of severe hyperandrogenism in a pregnant woman due to a rare instance of genetic SHBG deficiency illustrates this.[9][13]

Biochemistry

Biosynthesis

SHBG is produced mostly by the liver and is released into the bloodstream. Other sites that produce SHBG include the brain, uterus, testes, and placenta.[14] Testes-produced SHBG is called androgen-binding protein.

Gene

The gene for SHBG is called Shbg located on chromosome 17[14] on the short arm between the bands 17p12→p13.[15] Overlapping on the complementary DNA strand is the gene for spermidine/spermine N1-acetyltransferase family member 2 (SAT2). Nearby are the genes for p53 and ATP1B2, and fragile X mental retardation, autosomal homolog 2 (FXR2) on the complementary strand.[16] There are eight exons, of which exon 1 has three variations called 1L, 1T and 1N which are triggered by three promoters: PL, PT and PN respectively. SHBG comes with the 1L, 2, 3, 4, 5, 6, 7, and 8 exons connected together. A variation includes SHBG-T which is missing exon 7 but with exon 1T promoted by promoter PT on the opposite strand, which shared with that for SAT2.[17]

Polymorphisms

There are variations in the genetic material for this protein that have different effects. In humans common polymorphisms include the following:

Rs6259, also called Asp327Asn location 7633209 on Chromosome 17, results in there being an extra N-glycosilation site, and so an extra sugar can be attached. This results in a longer circulation half-life for the protein, and raised levels. A health effect is a lowered risk of endometrial cancer, and another is an increased risk of systemic lupus erythematosus.[18]

Rs6258 also called Ser156Pro is at position 7631360 on the Chromosome 17.

Rs727428 position 7634474 is in several percent of humans.[19]

(TAAAA)(n) is five base pairs that repeats a variable number of times on the opposite DNA strand.[20]

Promoter activation

The mechanism of activating the promoter for SHBG in the liver involves hepatocyte nuclear factor 4 alpha (HNF4A) binding to a DR1 like cis element which then stimulate production. Competing with HNF4A at a third site on the promoter is PPARG-2 which reduces copying the gene to RNA. If HNF4A level is low then COUP-TF binds to the first site and turns off production of SHBG.[7]

Protein

Sex hormone-binding globulin is homodimeric, meaning it has two identical peptide chains making up its structure. The amino acid sequence is the same as for androgen-binding protein but that has different oligosaccharides attached and is produced in testes.[14]

SHBG has two laminin G-like domains which form pockets that bind hydrophobic molecules. The steroids are bound by the LG domain at the amino end of the protein.[7] Inside the pocket of the domain is a serine residue that attracts the two different types of steroids at different points, thus changing their orientation. Androgens bind at the C3 functional groups on the A ring, and estrogens bind via a hydroxyl attached to C17 on the D ring. The two different orientations change a loop over the entrance to the pocket and the position of trp84 (in humans). Thus the whole protein signals what hormone it carries on its own surface.[7] The steroid binding LG domain is coded by exons 2 to 5.[7] A linker region joins the two LG domains together.[7]

When first produced the SHBG precursor has a leading signal peptide attached with 29 amino acids. The remaining peptide has 373 amino acids.[21] There are two sulfur bridges.

The sugars are attached at two different N-glycosylation points on asparagine (351 and 367) and one O-glycosylation (7) point on threonine.[21]

Metals

A calcium ion is needed to link the two elements of the dimer together. Also a zinc ion is used to orient an otherwise disorganised part of the peptide chain.[7]

Regulation

SHBG has both enhancing and inhibiting hormonal influences thus can be viewed as a hepatokine. It decreases with high levels of insulin, growth hormone, insulin-like growth factor 1 (IGF-1), androgens, prolactin and transcortin. High estrogen and thyroxine levels cause it to increase.

In an effort to explain obesity-related reductions in SHBG, recent evidence suggests sugar or monosaccharide-induced hepatic lipogenesis, hepatic lipids in general, and cytokines like TNF-alpha and Interleukin reduce SHBG, whereas insulin does not. As an example anti-psoriatic drugs that inhibit TNF-alpha cause an increase in SHBG. The common downstream mechanism for all of these, including the effect of thyroid hormones[22] was downregulation of HNF4, hepatocyte nuclear factor 4.[23][24][25][26]

Blood values

Reference ranges for blood tests for SHBG have been developed:[27][28]

PopulationRange
Adult female, premenopausal40–120 nmol/L
Adult female, postmenopausal28–112 nmol/L
Adult male20–60 nmol/L
Infant (1–23 months)60–252 nmol/L
Prepubertal (2 years–8 years)72–220 nmol/L
Pubertal female36–125 nmol/L
Pubertal male16–100 nmol/L

Clinical significance

High or low levels
Levels of sex hormones and SHBG during pregnancy in women.[29]
Levels of SHBG and estradiol during pregnancy in women.[30] For SHBG the lines are the mean and 95th percentile levels while the points are individual measurements.[30] For estradiol the line is the mean level.[30] The dashed parts of the lines are extrapolated.[30]
SHBG binding capacity during pregnancy in women.[31]

SHBG levels are decreased by androgens, administration of anabolic steroids,[32] polycystic ovary syndrome, hypothyroidism, obesity, Cushing's syndrome, and acromegaly. Low SHBG levels increase the probability of Type 2 Diabetes.[33] SHBG levels increase with estrogenic states (oral contraceptives), pregnancy, hyperthyroidism, cirrhosis, anorexia nervosa, and certain drugs. Long-term calorie restriction of more than 50 percent (in rodents) increases SHBG, while lowering free and total testosterone and estradiol. DHEA-S, which lacks affinity for SHBG, is not affected by calorie restriction.[34] Polycystic Ovarian Syndrome is associated with insulin resistance and excess insulin lowers SHBG, which increases free testosterone levels.[35]

In the womb the human fetus has a low level of SHBG allowing increased activity of sex hormones. After birth, the SHBG level rises and remains at a high level throughout childhood. At puberty the SHBG level halves in girls and goes down to a quarter in boys.[7] The change at puberty is triggered by growth hormone, and its pulsatility differs in boys and girls. In pregnant women in the third trimester of pregnancy the SHBG level escalates to five to ten times the usual level for a woman.[7][9] A hypothesis is that this protects against the effect of hormone produced by the fetus.[7]

Obese girls are more likely to have an early menarche due to lower levels of SHBG.[7] Anorexia or a lean physique in women leads to higher SHBG levels, which in turn can lead to amenorrhea.[7]

Type 2 diabetes

Reduced levels of SHBG and also certain polymorphisms of the SHBG gene are implicated in the development of insulin resistance and type 2 diabetes.[36] Such effects apparently involve direct action at the cellular level where it became apparent that cell membranes of certain tissues contain specific high-affinity SHBG receptors.[37]

Coagulation

SHBG is a useful correlate and indirect marker of estrogen-induced procoagulation and by extension thrombosis, for instance with birth control pills.[38][39][40]

Medications

Oral contraceptives containing ethinylestradiol can increase SHBG levels by 2- to 4-fold and decrease free testosterone concentrations by 40 to 80% in women.[41] They can be used to treat symptoms of hyperandrogenism like acne and hirsutism.[41][9] Some oral contraceptives, namely those containing high doses of ethinylestradiol (which have been discontinued and are no longer marketed), can increase SHBG levels by as much as 5- to 10-fold.[9]

Some medications, such as certain anabolic steroids like mesterolone and danazol and certain progestins like levonorgestrel and norethisterone, have high affinity for SHBG and can bind to it and displace endogenous steroids from it, thereby increasing free concentrations of these endogenous steroids.[42][43][44] It has been estimated that therapeutic levels of danazol, methyltestosterone, fluoxymesterone, levonorgestrel, and norethisterone would respectively occupy or displace from testosterone 83–97%, 48–69%, 42–64%, 16–47%, and 4–39% of SHBG binding sites, while others with low affinity for SHBG such as ethinylestradiol, cyproterone acetate, and medroxyprogesterone acetate would occupy or displace from testosterone 1% or fewer SHBG binding sites.[42][45]

Affinities of 70 medications for SHBG and CBG[42]
CompoundStructureSHBG
RBA (%)		SHBG
K (106 M−1)		CBG
RBA (%)		CBG
K (106 M−1)
AminoglutethimideNonsteroidal<0.01<0.2<0.1<0.1
AndrostanoloneSteroidal22055001.30.83
BetamethasoneSteroidal<0.01<0.2<0.1<0.1
CholecalciferolSteroidal<0.01<0.2<0.1<0.1
CimetidineNonsteroidal<0.01<0.2<0.1<0.1
ClomifeneNonsteroidal<0.01<0.2<0.1<0.1
Cortisol (hydrocortisone)Steroidal0.131.610076
Cortisone acetateSteroidal0.101.2<0.1<0.1
Cyproterone acetateSteroidal0.101.2<0.1<0.1
DanazolSteroidal18240106.5
DexamethasoneSteroidal<0.01<0.2<0.1<0.1
DiazoxideNonsteroidal<0.01<0.2<0.1<0.1
DiethylstilbestrolNonsteroidal<0.01<0.2<0.1<0.1
DigitoxinSteroidal<0.01<0.2<0.1<0.1
DigoxinSteroidal<0.01<0.2<0.1<0.1
DL-DOPANonsteroidal<0.01<0.2<0.1<0.1
DopamineNonsteroidal<0.01<0.2<0.1<0.1
EnclomipheneNonsteroidal<0.01<0.2<0.1<0.1
EpinephrineNonsteroidal<0.01<0.2<0.1<0.1
EstradiolSteroidal49680<0.1<0.1
Estradiol benzoateSteroidal0.708.6<0.1<0.1
EthinylestradiolSteroidal0.809.9<0.1<0.1
EthisteroneSteroidal557800.330.21
FludrocortisoneSteroidal<0.01<0.20.740.47
FluoxymesteroneSteroidal4.860<0.1<0.1
FlutamideNonsteroidal<0.01<0.2<0.1<0.1
Homovanillic acidNonsteroidal<0.01<0.2<0.1<0.1
Hydrocortisone hemisuccinateSteroidal<0.01<0.28.75.6
IndometacinNonsteroidal<0.01<0.2<0.1<0.1
LevonorgestrelSteroidal31420<0.1<0.1
MedroxyprogesteroneSteroidal0.151.9138.1
Medroxyprogesterone acetateSteroidal0.081.06.54.2
MelatoninNonsteroidal<0.01<0.2<0.1<0.1
MesteroloneSteroidal1803600<0.1<0.1
MestranolSteroidal<0.01<0.2<0.1<0.1
MethoxytryptopholNonsteroidal<0.01<0.2<0.1<0.1
MethyldopaNonsteroidal<0.01<0.2<0.1<0.1
MethylserotoninNonsteroidal<0.01<0.2<0.1<0.1
MethyltestosteroneSteroidal39530<0.1<0.1
MetiamideNonsteroidal<0.01<0.2<0.1<0.1
MetriboloneSteroidal1.7210.360.23
MetyraponeNonsteroidal<0.01<0.2<0.1<0.1
MexrenoneSteroidal<0.01<0.2<0.1<0.1
NafoxidineNonsteroidal<0.01<0.2<0.1<0.1
NandroloneSteroidal5.8720.100.63
NorepinephrineNonsteroidal<0.01<0.2<0.1<0.1
NorethisteroneSteroidal111400.280.18
NoretynodrelSteroidal1.3160.160.10
NormetanephrineNonsteroidal<0.01<0.2<0.1<0.1
PhenytoinNonsteroidal<0.01<0.2<0.1<0.1
Potassium canrenoateSteroidal0.182.20.830.53
PrednisoloneSteroidal0.040.495941
PrednisoneSteroidal0.172.15.03.2
ProgesteroneSteroidal0.718.83624
PromegestoneSteroidal0.0070.090.400.25
ProrenoneSteroidal8.2100<0.1<0.1
ReserpineNonsteroidal<0.01<0.2<0.1<0.1
RifampinNonsteroidal<0.01<0.2<0.1<0.1
SerotoninNonsteroidal<0.01<0.2<0.1<0.1
SpironolactoneSteroidal0.030.37<0.1<0.1
TamoxifenNonsteroidal<0.01<0.2<0.1<0.1
TestolactoneSteroidal<0.01<0.2<0.1<0.1
TestosteroneSteroidal10016008.35.3
Testosterone enanthateSteroidal0.0070.086<0.1<0.1
7α-ThioprogesteroneSteroidal0.060.743624
7α-ThiospironolactoneSteroidal0.597.3<0.1<0.1
ThyroxineNonsteroidal<0.01<0.2<0.1<0.1
TriiodothyronineNonsteroidal<0.01<0.2<0.1<0.1
TrimethyltrienoloneSteroidal0.90110.110.07
Vanillylmandelic acidNonsteroidal<0.01<0.2<0.1<0.1
ZuclomifeneNonsteroidal<0.01<0.2<0.1<0.1
The reference ligands (100%) for the RBA (%) values were testosterone for SHBG and cortisol for CBG.
Affinities of 21 progestins for SHBG and CBG[44][46]
ProgestogenSHBG (%)CBG (%)
17α-Allyl-19-nortestosterone<1 ?
Allylestrenol<1 ?
Chlormadinone acetate<1<1
Cyproterone acetate<1<1
Desogestrel<1<1
Dienogest<1<1
Drospirenone<1<1
Etonogestrel15<1
Gestodene40<1
Levonorgestrel50<1
Medroxyprogesterone acetate<1<1
Megestrol acetate<1<1
Nomegestrol acetate<1<1
Norelgestromin<1 ?
Norethisterone16<1
Noretynodrel<1<1
Norgestimate<1<1
Progesterone<136
Promegestone<1<1
Segesterone acetate<1 ?
Δ4-Tibolone1<1
Values are RBAs (%). The reference ligand (100%) for SHBG was dihydrotestosterone and for CBG was cortisol.
Affinities of 14 AAS for SHBG[43]
CompoundSHBG (%)
5α-Androstane-3β,17β-diol17
5β-Androstane-3α,17β-diol5
Dihydrotestosterone100
Ethylestrenol<1
Fluoxymesterone<1
Mesterolone440
Metandienone2
Metenolone3
Methyltestosterone5
Metribolone<1
Nandrolone1
Oxymetholone<1
Stanozolol1
Testosterone19
Values are RBAs (%). The reference ligand (100%) for SHBG was dihydrotestosterone.
Affinities of 41 steroids for SHBG[47]
CompoundSHBG (%)
3β-Androstanediol100
Androstenediol77
Bolandiol24
Dihydroethisterone100
Dihydroethyltestosterone18–21
Dihydromethylandrostenediol77
Dihydronandrolone44
Dihydrotestosterone100
Dihydrotrestolone47
4,17α-Dimethyltestosterone97
Drostanolone39
Ethisterone92
Fluoxymesterone3
11-Ketodihydrotestosterone0
Medroxyprogesterone acetate16
Megestrol acetate0
Mestanolone84
Methasterone58
Methyl-1-testosterone69
Methylandrostenediol40
Methyltestosterone64
Mibolerone6
Nandrolone16
Nandrolone decanoate0
Nandrolone phenylpropionate0
Norethandrolone3
Norethisterone21
Normethandrone7
Oxandrolone0
Oxymetholone3
Progesterone13
Stanozolol36
1-Testosterone98
Testosterone82
Testosterone benzoate8
Testosterone cypionate6
Testosterone enanthate9
Δ4-Tibolone8
Trestolone12
Trestolone enanthate12
Vinyltestosterone36
Values are RBAs (%). The reference ligand (100%) for SHBG was dihydrotestosterone.
Affinities of 11 steroids for SHBG and CBG[48]
CompoundSHBG (%)CBG (%)
Aldosterone<0.26.0
Corticosterone<0.2107
Cortisol<0.2100
Dexamethasone<0.2<0.1
Dihydrotestosterone1000.8
Estradiol8.7<0.1
Metribolone0.2<0.1
Moxestrol<0.2<0.1
Progesterone<0.225
Promegestone<0.20.9
Testosterone263
Values are RBAs (%). The reference ligand (100%) for SHBG was dihydrotestosterone and for CBG was cortisol.
Affinities of 9 estrogens for SHBG[44][49]
CompoundRBA to
SHBG (%)		Bound to
SHBG (%)		Bound to
albumin (%)
17β-Estradiol503761
Estrone121680
Estriol0.3191
Estrone sulfate0099
17β-Dihydroequilin30 ? ?
Equilin82613
17β-Dihydroequilin sulfate0 ? ?
Equilin sulfate0 ? ?
Δ8-Estrone ? ? ?
The reference ligand (100%) for the SHBG RBA (%) values was testosterone.


Endogenous steroids

Measurement

When checking serum estradiol or testosterone, a total level that includes free and bound fractions can be assayed, or the free portion may be measured alone. Sex hormone-binding globulin can be measured separately from the total fraction of testosterone.

A free androgen index expresses the ratio of testosterone to SHBG and can be used to summarize the activity of free testosterone.

Affinity and binding
Affinities of endogenous steroids for SHBG and plasma protein binding[50]
SteroidSHBG affinityPlasma protein binding in menPlasma protein binding in women (follicular phase)
RBA (%)K (106 M−1)Total (nM)Unbound (%)SHBG (%)CBG (%)Albumin (%)Total (nM)Unbound (%)SHBG (%)CBG (%)Albumin (%)
Aldosterone0.0170.210.3537.10.1021.241.60.2436.80.2321.941.2
3α-Androstanediol8213000.410.8513.7<0.185.50.0680.7127.9<0.171.4
Androstenediol9715004.33.2460.4<0.136.32.41.7378.8<0.119.4
Androstenedione2.3294.17.852.821.3788.05.47.546.631.3784.5
Androsterone1.1142.04.220.730.5294.51.54.181.770.5493.5
Corticosterone0.182.2123.390.0977.519.07.03.280.2278.118.4
Cortisol0.131.64003.910.0889.56.574003.770.1889.76.33
Cortisone0.222.77216.20.5438.045.35415.81.3038.644.3
Dehydroepiandrosterone5.366244.133.38<0.192.4173.937.88<0.188.1
11-Deoxycorticosterone1.9240.202.690.8036.460.10.122.621.9136.958.6
11-Deoxycortisol1.3161.43.370.6777.118.90.603.241.5777.118.1
Dihydrotestosterone22055001.70.8859.70.2239.20.650.4778.40.1221.0
Estradiol496800.0842.3219.6<0.178.00.291.8137.3<0.160.8
Estriol0.354.30.0378.150.44<0.291.30.108.101.06<0.290.7
Estrone121500.0813.967.37<0.188.60.233.5816.3<0.180.1
Etiocholanolone0.111.41.38.150.140.4491.31.28.130.350.4691.1
Pregnenolone1.1142.42.870.500.1696.52.22.851.210.1695.8
17α-Hydroxypregnenolone0.192.35.44.270.12<0.195.53.54.260.30<0.195.4
Progesterone0.718.80.572.390.2617.280.10.652.360.6317.779.3
17α-Hydroxyprogesterone0.89.95.42.500.3141.355.91.82.440.7342.154.7
Testosterone1001600232.2344.33.5649.91.31.3666.02.2630.4
In men, the concentrations of SHBG, CBG, and albumin were 28 nM, 0.7 μM, and 0.56 mM, respectively. In women, the concentrations of SHBG, CBG, and albumin were 37 nM, 0.7 μM, and 0.56 mM, respectively.

Synonyms

SHBG has been known under a variety of different names including:[51][52][53]

  • Sex hormone-binding globulin (SHBG)
  • Sex steroid-binding globulin (SSBG, SBG)
  • Sex steroid-binding protein (SBP, SSBP)
  • Androgen-binding protein (ABP)
  • Estradiol-binding-protein (EBP)
  • Testosterone–estradiol binding globulin (TeBG, TEBG)

References
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Further reading
  • Overview of all the structural information available in the PDB for UniProt: P04278 (Sex hormone-binding globulin) at the PDBe-KB.
  • Androgen-Binding+Protein at the US National Library of Medicine Medical Subject Headings (MeSH)
  • Ensembl Gene ref Protein ref
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