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Transducer Mechanism: Nuclear Receptors

Transducer Mechanism: Nuclear Receptors

Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:

Types of Receptors: Internal Receptors

Types of Receptors: Internal Receptors

Many cellular signals are hydrophilic and cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind intracellular receptors that reside within the cell cytoplasm or nucleus. Many mammalian steroid hormones and nitric oxide (NO) gas use this cell signaling mechanism.
Similar to membrane-bound receptors, the binding of a ligand to the intracellular receptor of causes a conformational change in the...

Internal Receptors

Internal Receptors

Many cellular signals are hydrophilic and therefore cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind to internal, or intracellular, receptors that reside within the cell. Many mammalian steroid hormones use this mechanism of cell signaling, as does nitric oxide (NO) gas.

Internal Receptors

Internal Receptors

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Related Experiment Video

Updated: May 21, 2026

Biochemical Reconstitution of Steroid Receptor•Hsp90 Protein Complexes and Reactivation of Ligand Binding

Biochemical Reconstitution of Steroid Receptor•Hsp90 Protein Complexes and Reactivation of Ligand Binding

Published on: September 21, 2011

Steroid receptor coupling becomes nuclear.

Mario D Galigniana¹

¹Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales de la Universidad de Buenos Aires/INQUIBICEN and IBYME/CONICET, Buenos Aires C1428ADN, Argentina. mgali@qb.fcen.uba.ar

Chemistry & Biology

|June 26, 2012

Summary

This study reveals how the mineralocorticoid receptor (MR) moves to the nucleus, showing its DNA binding and activity depend on Hsp90. MR dimerization occurs within the nucleus, a key step in its function.

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Biochemical Reconstitution of Steroid Receptor•Hsp90 Protein Complexes and Reactivation of Ligand Binding

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Reverse Yeast Two-hybrid System to Identify Mammalian Nuclear Receptor Residues that Interact with Ligands and/or Antagonists

Reverse Yeast Two-hybrid System to Identify Mammalian Nuclear Receptor Residues that Interact with Ligands and/or Antagonists

Published on: November 15, 2013

Area of Science:

Molecular Biology
Endocrinology
Cell Biology

Background:

The mineralocorticoid receptor (MR) mediates aldosterone's effects, regulating crucial physiological processes.
Understanding MR's cellular trafficking and activation is vital for comprehending mineralocorticoid signaling.
Previous studies have implicated various factors in MR regulation, but nuclear events remain areas of active investigation.

Discussion:

This research elucidates the aldosterone-dependent nuclear import and retrotransport of the mineralocorticoid receptor.
The study investigates the critical role of Heat Shock Protein 90 (Hsp90) in MR retrotransport, DNA-binding, and transcriptional regulation.
Evidence is presented that MR dimerization, a prerequisite for DNA binding, is a nuclear event.

Key Insights:

Aldosterone signaling is tightly controlled by the nuclear translocation dynamics of the mineralocorticoid receptor.
Hsp90 is essential for multiple stages of MR activation, including its movement within the nucleus and interaction with DNA.
Mineralocorticoid receptor dimerization occurs specifically within the nuclear compartment, influencing its downstream transcriptional activity.

Outlook:

Further exploration of Hsp90's interaction with MR could reveal novel therapeutic targets for diseases involving MR dysregulation.
Investigating the precise mechanisms of MR dimerization in the nucleus may offer insights into selective receptor modulation.
Understanding the complete pathway of MR nuclear translocation and activation can enhance our knowledge of steroid hormone action.