Glucocorticoid receptor

Last updated
NR3C1
Glucocorticoid receptor.png
Available structures
PDB Ortholog search: PDBe RCSB
Identifiers
Aliases NR3C1 , GCCR, GCR, GCRST, GR, GRL, nuclear receptor subfamily 3 group C member 1, Glucocorticoid Receptor
External IDs OMIM: 138040 MGI: 95824 HomoloGene: 30960 GeneCards: NR3C1
Orthologs
SpeciesHumanMouse
Entrez

2908

14815

Ensembl

ENSG00000113580

ENSMUSG00000024431

UniProt

P04150
Q3MSN4

P06537

RefSeq (mRNA)

NM_008173
NM_001361209
NM_001361210
NM_001361211
NM_001361212

RefSeq (protein)

NP_001348138
NP_001348139
NP_001348140
NP_001348141
NP_032199

Location (UCSC) Chr 5: 143.28 – 143.44 Mb Chr 18: 39.54 – 39.65 Mb
PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

The glucocorticoid receptor (GR or GCR) also known as NR3C1 (nuclear receptor subfamily 3, group C, member 1) is the receptor to which cortisol and other glucocorticoids bind.

The GR is expressed in almost every cell in the body and regulates genes controlling the development, metabolism, and immune response. Because the receptor gene is expressed in several forms, it has many different (pleiotropic) effects in different parts of the body.

When glucocorticoids bind to GR, its primary mechanism of action is the regulation of gene transcription. [5] [6] The unbound receptor resides in the cytosol of the cell. After the receptor is bound to glucocorticoid, the receptor-glucocorticoid complex can take either of two paths. The activated GR complex up-regulates the expression of anti-inflammatory proteins in the nucleus or represses the expression of pro-inflammatory proteins in the cytosol (by preventing the translocation of other transcription factors from the cytosol into the nucleus).

In humans, the GR protein is encoded by NR3C1 gene which is located on chromosome 5 (5q31). [7] [8]

Structure

Like the other steroid receptors, [9] the glucocorticoid receptor is modular in structure [10] and contains the following domains (labeled A - F):

Ligand binding and response

In the absence of hormone, the glucocorticoid receptor (GR) resides in the cytosol complexed with a variety of proteins including heat shock protein 90 (hsp90), the heat shock protein 70 (hsp70) and the protein FKBP4 (FK506-binding protein 4). [11] The endogenous glucocorticoid hormone cortisol diffuses through the cell membrane into the cytoplasm and binds to the glucocorticoid receptor (GR) resulting in release of the heat shock proteins. The resulting activated form GR has two principal mechanisms of action, transactivation and transrepression, [12] [13] described below.

Transactivation

A direct mechanism of action involves homodimerization of the receptor, translocation via active transport into the nucleus, and binding to specific DNA response elements activating gene transcription. This mechanism of action is referred to as transactivation. The biological response depends on the cell type.[ citation needed ]

Transrepression

In the absence of activated GR, other transcription factors such as NF-κB or AP-1 themselves are able to transactivate target genes. [14] However activated GR can complex with these other transcription factors and prevent them from binding their target genes and hence repress the expression of genes that are normally upregulated by NF-κB or AP-1. This indirect mechanism of action is referred to as transrepression.[ citation needed ] GR transrepression via NF-κB and AP-1 is restricted only to certain cell types, and is not considered the universal mechanism for IκBα repression. [15] [16]

Clinical significance

The GR is abnormal in familial glucocorticoid resistance. [17]

In central nervous system structures, the glucocorticoid receptor is gaining interest as a novel representative of neuroendocrine integration, functioning as a major component of endocrine influence - specifically the stress response - upon the brain. The receptor is now implicated in both short and long-term adaptations seen in response to stressors and may be critical to the understanding of psychological disorders, including some or all subtypes of depression and post-traumatic stress disorder (PTSD). [18] Indeed, long-standing observations such as the mood dysregulations typical of Cushing's disease demonstrate the role of corticosteroids in regulating psychologic state; recent advances have demonstrated interactions with norepinephrine and serotonin at the neural level. [19] [20]

In preeclampsia (a hypertensive disorder commonly occurring in pregnant women), the level of a miRNA sequence possibly targeting this protein is elevated in the blood of the mother. Rather, the placenta elevates the level of exosomes containing this miRNA, which can result in inhibition of translation of molecule. Clinical significance of this information is not yet clarified. [21]

Agonists and antagonists

Dexamethasone and other corticosteroids are agonists, while mifepristone and ketoconazole are antagonists of the GR. Anabolic steroids also prevent cortisol from binding to the glucocorticoid receptor.

Interactions

Glucocorticoid receptor has been shown to interact with:

See also

Related Research Articles

<span class="mw-page-title-main">Androgen receptor</span> Mammalian protein found in humans

The androgen receptor (AR), also known as NR3C4, is a type of nuclear receptor that is activated by binding any of the androgenic hormones, including testosterone and dihydrotestosterone, in the cytoplasm and then translocating into the nucleus. The androgen receptor is most closely related to the progesterone receptor, and progestins in higher dosages can block the androgen receptor.

<span class="mw-page-title-main">Transcription factor Sp1</span> Protein-coding gene in the species Homo sapiens

Transcription factor Sp1, also known as specificity protein 1* is a protein that in humans is encoded by the SP1 gene.

<span class="mw-page-title-main">Estrogen receptor alpha</span> Protein-coding gene in the species Homo sapiens

Estrogen receptor alpha (ERα), also known as NR3A1, is one of two main types of estrogen receptor, a nuclear receptor that is activated by the sex hormone estrogen. In humans, ERα is encoded by the gene ESR1.

<span class="mw-page-title-main">Mineralocorticoid receptor</span> Nuclear receptor that mediates the effects of the mineralocorticoid hormone Aldosterone

The mineralocorticoid receptor, also known as the aldosterone receptor or nuclear receptor subfamily 3, group C, member 2, (NR3C2) is a protein that in humans is encoded by the NR3C2 gene that is located on chromosome 4q31.1-31.2.

<span class="mw-page-title-main">Pregnane X receptor</span> Mammalian protein found in Homo sapiens

In the field of molecular biology, the pregnane X receptor (PXR), also known as the steroid and xenobiotic sensing nuclear receptor (SXR) or nuclear receptor subfamily 1, group I, member 2 (NR1I2) is a protein that in humans is encoded by the NR1I2 gene.

<span class="mw-page-title-main">Constitutive androstane receptor</span> Protein-coding gene in humans

The constitutive androstane receptor (CAR) also known as nuclear receptor subfamily 1, group I, member 3 is a protein that in humans is encoded by the NR1I3 gene. CAR is a member of the nuclear receptor superfamily and along with pregnane X receptor (PXR) functions as a sensor of endobiotic and xenobiotic substances. In response, expression of proteins responsible for the metabolism and excretion of these substances is upregulated. Hence, CAR and PXR play a major role in the detoxification of foreign substances such as drugs.

<span class="mw-page-title-main">Nuclear receptor coactivator 1</span> Protein-coding gene in the species Homo sapiens

The nuclear receptor coactivator 1 (NCOA1), also called steroid receptor coactivator-1 (SRC-1), is a transcriptional coregulatory protein that contains several nuclear receptor–interacting domains and possesses intrinsic histone acetyltransferase activity. It is encoded by the gene NCOA1.

<span class="mw-page-title-main">Nuclear receptor coactivator 3</span> Protein-coding gene in the species Homo sapiens

The nuclear receptor coactivator 3 also known as NCOA3 is a protein that, in humans, is encoded by the NCOA3 gene. NCOA3 is also frequently called 'amplified in breast 1' (AIB1), steroid receptor coactivator-3 (SRC-3), or thyroid hormone receptor activator molecule 1 (TRAM-1).

<span class="mw-page-title-main">Nuclear receptor 4A1</span> Mammalian protein found in Homo sapiens

The nuclear receptor 4A1 also known as Nur77, TR3, and NGFI-B is a protein that in humans is encoded by the NR4A1 gene.

<span class="mw-page-title-main">Liver receptor homolog-1</span> Protein-coding gene in the species Homo sapiens

The liver receptor homolog-1 (LRH-1) also known as totipotency pioneer factor NR5A2 is a protein that in humans is encoded by the NR5A2 gene. LRH-1 is a member of the nuclear receptor family of intracellular transcription factors.

<span class="mw-page-title-main">Small heterodimer partner</span> Protein-coding gene in the species Homo sapiens

The small heterodimer partner (SHP) also known as NR0B2 is a protein that in humans is encoded by the NR0B2 gene. SHP is a member of the nuclear receptor family of intracellular transcription factors. SHP is unusual for a nuclear receptor in that it lacks a DNA binding domain. Therefore, it is technically neither a transcription factor nor nuclear receptor but nevertheless it is still classified as such due to relatively high sequence homology with other nuclear receptor family members.

<span class="mw-page-title-main">RELA</span> Protein-coding gene in the species Homo sapiens

Transcription factor p65 also known as nuclear factor NF-kappa-B p65 subunit is a protein that in humans is encoded by the RELA gene.

<span class="mw-page-title-main">CEBPB</span> Protein-coding gene in the species Homo sapiens

CCAAT/enhancer-binding protein beta is a protein that in humans is encoded by the CEBPB gene.

<span class="mw-page-title-main">COUP-TFI</span> Protein found in humans

COUP-TF1 also known as NR2F1 is a protein that in humans is encoded by the NR2F1 gene. This protein is a member of nuclear hormone receptor family of steroid hormone receptors.

<span class="mw-page-title-main">Liver X receptor beta</span> Protein-coding gene in the species Homo sapiens

Liver X receptor beta (LXR-β) is a member of the nuclear receptor family of transcription factors. LXR-β is encoded by the NR1H2 gene.

<span class="mw-page-title-main">FKBP5</span> Protein-coding gene in humans

FK506 binding protein 5, also known as FKBP5, is a protein which in humans is encoded by the FKBP5 gene.

<span class="mw-page-title-main">SRA1</span> Protein-coding gene in the species Homo sapiens

Steroid receptor RNA activator 1 also known as steroid receptor RNA activator protein (SRAP) is a protein that in humans is encoded by the SRA1 gene. The mRNA transcribed from the SRA1 gene is a component of the ribonucleoprotein complex containing NCOA1. This functional RNA also encodes a protein.

<span class="mw-page-title-main">RASD1</span> Protein-coding gene in the species Homo sapiens

Dexamethasone-induced Ras-related protein 1 (RASD1) is a protein that in humans is encoded by the RASD1 gene on chromosome 17. It is ubiquitously expressed in many tissues and cell types. As a member of the Ras superfamily of small G-proteins, RASD1 regulates signal transduction pathways through both G proteins and G protein-coupled receptors. RASD1 has been associated with several cancers. The RASD1 gene also contains one of 27 SNPs associated with increased risk of coronary artery disease.

<span class="mw-page-title-main">GRLF1</span> Protein-coding gene in the species Homo sapiens

Glucocorticoid receptor DNA-binding factor 1 is a protein that in humans is encoded by the GRLF1 gene.

<span class="mw-page-title-main">Selective glucocorticoid receptor modulator</span> Class of experimental drugs

Selective glucocorticoid receptor modulators (SEGRMs) and selective glucocorticoid receptor agonists (SEGRAs) formerly known as dissociated glucocorticoid receptor agonists (DIGRAs) are a class of experimental drugs designed to share many of the desirable anti-inflammatory, immunosuppressive, or anticancer properties of classical glucocorticoid drugs but with fewer side effects such as skin atrophy. Although preclinical evidence on SEGRAMs’ anti-inflammatory effects are culminating, currently, the efficacy of these SEGRAMs on cancer are largely unknown.

References

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