physics

Glucocorticoid receptor

Glucocorticoid receptor is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Glucocorticoid receptor rather than just read about it. In short: The glucocorticoid receptor (GR or GCR) also known by its gene name NR3C1 (nuclear receptor subfamily 3, group C, member 1) is the steroid receptor for glucocorticoids such as cortisol. The GR is expressed in almost every cell in the body and regulates genes controlling the development, metabolism, inflammation, and immune response.

Key takeaways

Glucocorticoid receptor belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Glucocorticoid receptor to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Glucocorticoid receptor from memory before moving on to harder problems.

Reference excerpt

The glucocorticoid receptor (GR or GCR) also known by its gene name NR3C1 (nuclear receptor subfamily 3, group C, member 1) is the steroid receptor for glucocorticoids such as cortisol. The GR is expressed in almost every cell in the body and regulates genes controlling the development, metabolism, inflammation, and immune response. Because the receptor gene is expressed in several forms, it has many different (pleiotropic) effects in different parts of the body and in the context of different diseases. GR is a steroid receptor and thus its canonical action is similar to other steroid receptors. The unbound receptor resides in the cytosol of the cell. When glucocorticoids bind to the receptor, GR translocates to the nucleus of the cell where it acts as a transcription factor. 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).

Structure Like the other steroid receptors, GR is modular in structure and contains the following domains (labeled A - F):

A/B - N-terminal regulatory domain C - DNA-binding domain (DBD) D - hinge region E - ligand-binding domain (LBD) F - C-terminal domain

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). The endogenous glucocorticoid hormone cortisol diffuses through the cell membrane into the cytoplasm and binds to the glucocorticoid receptor (GR) resulting in the release of the heat shock proteins. The resulting activated form GR has two principal mechanisms of action, transactivation, and transrepression, 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.

Transrepression In the absence of activated GR, other transcription factors such as NF-κB or AP-1 themselves are able to transactivate target genes. 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. 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.

Clinical significance The GR is abnormal in familial glucocorticoid resistance. 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). 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. 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. In castration-resistant prostate cancer the glucocorticoid receptor has been shown to be upregulated, transcribing genes that are usually regulated by the androgen receptor. This upregulation drives resistance to enzalutamide, a drug used to treat prostate cancer.

Ligands

Agonists

Hydrocortisone (cortisol) Prednisone Prednisolone Methylprednisolone Dexamethasone Betamethasone Triamcinolone Other corticosteroids

Selective glucocorticoid receptor modulators

AZD-5423 CORT-108297 Dagrocorat (PF-00251802) Dazucorilant (CORT-113176) Deflazacort Fosdagrocorat (PF-04171327) Mapracorat (BOL-303242-X, ZK-245186) Miricorilant (CORT-118335)

Antagonists

Ketoconazole Mifepristone Relacorilant (CORT-125134)

Interactions Glucocorticoid receptor has been shown to interact with:

See also Membrane glucocorticoid receptor Selective glucocorticoid receptor agonist (SEGRA)

References

Illustrations

Worked examples

Example 1 — a first encounter with Glucocorticoid receptor

Start with the simplest possible case. Write down what Glucocorticoid receptor claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Glucocorticoid receptor before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Glucocorticoid receptor ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Glucocorticoid receptor

In research: Glucocorticoid receptor appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Glucocorticoid receptor in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Glucocorticoid receptor is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 5, Genome projects, Nuclear receptors, so understanding it makes those chapters shorter.
In everyday life: Look for Glucocorticoid receptor outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Glucocorticoid receptor in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Glucocorticoid receptor means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Glucocorticoid receptor out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Glucocorticoid receptor in simple terms?

Why does Glucocorticoid receptor matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Glucocorticoid receptor?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Glucocorticoid receptor.