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GPCR Desensitization

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G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...

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Updated: Jan 13, 2026

Molecular Modulation by Lentivirus-Delivered Specific shRNAs in Endoplasmic Reticulum Stressed Neurons

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Published on: April 24, 2021

Targeting CRABP1 Signalosomes in Managing Neurodegeneration.

Jennifer Nhieu¹, Li-Na Wei¹

¹Department of Pharmacology, University of Minnesota Medical School, Minneapolis, MN 55455, USA.

|October 29, 2025

Summary

This summary is machine-generated.

New synthetic retinoids selectively target cellular retinoic acid-binding protein 1 (CRABP1) signalosomes, offering a promising therapeutic strategy for neurodegenerative diseases by avoiding toxic effects associated with traditional retinoic acid (RA) pathways.

Keywords:

AD ALS CRABP1 HD PD atRA neurodegeneration non-canonical activity

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Chemogenetic Regulation in Reprogrammed Stem Cell-derived Precursor Cells in Treating Neurodegenerative Diseases

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Published on: May 2, 2025

Area of Science:

Neuroscience
Molecular Biology
Drug Discovery

Background:

Retinoic acid (RA) exerts canonical effects via RAR/RXR receptors and non-canonical effects through cellular retinoic acid-binding protein 1 (CRABP1).
CRABP1 forms signalosomes that regulate cytosolic signaling independently of nuclear receptors.
Reduced CRABP1 expression is observed in motor neurons of human ALS and SMA patients.

Purpose of the Study:

To review therapeutic strategies targeting CRABP1 signalosomes for neurodegenerative diseases.
To introduce novel synthetic retinoids designed to selectively modulate CRABP1 activity.
To explore the potential of CRABP1-selective compounds in circumventing RA-associated toxicities.

Main Methods:

Proteomic studies to identify CRABP1-associated protein complexes (signalosomes).
Investigation of epigenetic regulation of the mouse Crabp1 gene.
Development and characterization of first-generation CRABP1-selective synthetic retinoids (C3, C4, C32).

Main Results:

CRABP1 signalosomes, including CRABP1-MAPK and CRABP1-CaMKII, are implicated in neurodegeneration.
Novel synthetic retinoids selectively bind CRABP1, bypassing RARs.
Compounds C3, C4, and C32 demonstrate targeting of CRABP1-MAPK and/or CRABP1-CaMKII signalosomes.

Conclusions:

Targeting CRABP1 signalosomes represents a novel therapeutic avenue for neurodegenerative disorders.
CRABP1-selective retinoids offer a safer alternative to conventional RA therapy by avoiding RAR-mediated toxicity.
Structural insights and selective compounds pave the way for next-generation CRABP1-targeting drugs for neurodegenerative diseases.