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Retinoid receptors and therapeutic applications of RAR/RXR modulators
Albane le Maire1, Susana Alvarez, Pattabhiraman Shankaranarayanan
1Institut National de la Santé et de la Recherche Médicale, U1054, Montpellier, France.
Abstract:
Retinoic acid receptors (RARs) are ligand-controlled transcription factors that function as heterodimers with retinoid X receptors (RXRs) to regulate cell growth, differentiation, survival and death. Due to their regulatory potential, these nuclear receptors (NRs) are major drug targets for a variety of pathologies, including cancer and metabolic diseases. A large amount of RAR- and RXR-selective ligands, ranging from (partial) agonists to antagonists and inverse agonists, have been designed and the corresponding structural and functional analyses have provided deep insight into the molecular basis of ligand action. Ligands regulate, via allosteric conformational changes, the ability of these NRs to interact with different sets of coregulators, which in turn recruit enzymatically active complexes/machineries. Here, we describe strategies in the design of selective RXR and RAR modulators and review the structural mechanisms by which the diverse pharmacological classes of compounds modulate receptor functions. Finally, we discuss the perspectives for retinoid- and rexinoid-based therapies.
Insights
Retinoic acid receptors (RARs) and retinoid X receptors (RXRs) are key drug targets. Designing selective ligands for these nuclear receptors offers new therapeutic strategies for cancer and metabolic diseases.
Area of Science:
- Molecular biology
- Pharmacology
- Drug discovery
Background:
- Retinoic acid receptors (RARs) and retinoid X receptors (RXRs) are nuclear receptors crucial for regulating cell growth, differentiation, survival, and death.
- These receptors form heterodimers and are significant drug targets for treating cancer and metabolic diseases.
Purpose of the Study:
- To outline strategies for designing selective RAR and RXR modulators.
- To review the structural mechanisms underlying how different pharmacological compounds modulate receptor functions.
- To discuss the future potential of retinoid- and rexinoid-based therapies.
Main Methods:
- Design and synthesis of selective RAR and RXR ligands.
- Structural and functional analyses of ligand-receptor interactions.
- Review of existing literature on retinoid and rexinoid pharmacology.
Main Results:
- Extensive libraries of RAR- and RXR-selective ligands, including agonists, antagonists, and inverse agonists, have been developed.
- Structural studies reveal how ligands induce allosteric conformational changes, modulating coregulator interactions.
- Understanding these mechanisms provides insight into the molecular basis of ligand action.
Conclusions:
- Selective modulation of RARs and RXRs presents promising therapeutic avenues.
- Further research into retinoid and rexinoid-based therapies holds significant potential for various diseases.
- Targeted drug design based on structural insights can optimize therapeutic outcomes.
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