Related Experiment Video
Updated: Aug 8, 2025
08:58
Artificial Intelligence Approaches to Assessing Primary Cilia
Published on: May 1, 2021
3.6K
Physiological Condition-Dependent Changes in Ciliary GPCR Localization in the Brain
Kathryn M Brewer1, Staci E Engle1, Ruchi Bansal1
1Department of Biology, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202.
Eneuro
|February 27, 2023
Summary
Primary cilia are crucial for neuron signaling. This study shows G-protein-coupled receptor localization to cilia changes dynamically in the mouse brain, impacting feeding behavior.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Primary cilia are vital cellular structures involved in diverse signaling pathways, particularly within the central nervous system (CNS).
- G-protein-coupled receptors (GPCRs) are preferentially localized to cilia, mediating critical neuronal functions like feeding behavior and energy homeostasis.
- While model systems suggest dynamic cilia changes are key for GPCR signaling, their in vivo relevance in mammals remains unclear.
Purpose of the Study:
- To investigate the dynamic in vivo localization of neuronal G-protein-coupled receptors (GPCRs) to primary cilia in the mammalian brain.
- To examine whether physiological conditions associated with GPCR functions, such as feeding behavior, influence cilia length, receptor occupancy, and cilia frequency.
- To assess melanin-concentrating hormone receptor 1 (MCHR1) and neuropeptide-Y receptor 2 (NPY2R) as mammalian models for ciliary GPCR dynamics.
Main Methods:
- Utilized a computer-assisted, high-throughput analysis of cilia in the mouse brain.
- Quantified cilia frequency, length, and receptor occupancy for MCHR1 and NPY2R under varying physiological conditions.
- Focused analysis on specific brain regions relevant to feeding behavior and energy homeostasis.
Main Results:
- Observed condition-dependent changes in ciliary length, receptor occupancy, and cilia frequency for one of the assessed GPCRs (MCHR1 or NPY2R) in specific brain regions.
- Demonstrated that these dynamic changes were receptor- and cell-type specific.
- Found no significant changes for the other assessed GPCR under the tested conditions.
Conclusions:
- Dynamic G-protein-coupled receptor (GPCR) localization to primary cilia is a receptor- and cell-specific phenomenon in the mammalian brain.
- These findings suggest that individual GPCR properties and cellular context dictate ciliary localization dynamics.
- Understanding these subcellular dynamics could uncover novel molecular mechanisms regulating feeding behavior and other physiological processes.
