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Imaging Dendritic Spines in Caenorhabditis elegans
Published on: September 27, 2021
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PCDH17 restricts dendritic spine morphogenesis by regulating ROCK2-dependent control of the actin cytoskeleton,
Laidong Yu1,2, Fangfang Zeng1,2, Mengshu Fan1,2
1Hunan Key Laboratory of Molecular Precision Medicine, Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China.
Zoological Research
|May 15, 2024
Summary
Protocadherin 17 (PCDH17) restricts dendritic spine size and number, impacting neuronal circuits. Its interaction with ROCK2 influences actin organization, offering insights into mood disorder pathology.
Area of Science:
- Neuroscience
- Molecular Biology
- Neurobiology
Background:
- Synaptic plasticity is crucial for neuronal circuit function and cognitive processes.
- Abnormalities in dendritic spine density and morphology are implicated in neuropsychiatric disorders.
- Protocadherin 17 (PCDH17) is genetically linked to mood disorders like bipolar disorder and depression.
Purpose of the Study:
- To elucidate the molecular mechanisms by which PCDH17 regulates dendritic spine development and associated behaviors.
- To investigate the role of PCDH17 in postsynaptic sites and its impact on neuronal structure and function.
Main Methods:
- Investigated PCDH17 localization and function in postsynaptic sites of excitatory neurons.
- Utilized selective overexpression of PCDH17 in the ventral hippocampal CA1 region of mice.
- Analyzed dendritic spine number and morphology using advanced imaging techniques.
- Examined the interaction of PCDH17 with actin-regulatory proteins, including ROCK2, LIMK1, and cofilin.
- Assessed the effects of ROCK2 inhibition using belumosudil (KD025) on F-actin organization and spine structure.
Main Results:
- PCDH17 was found to restrict the number and size of dendritic spines in excitatory neurons.
- Overexpression of PCDH17 led to spine loss and induced anxiety- and depression-like behaviors in mice.
- PCDH17 interacts with ROCK2, increasing its expression and downstream signaling (LIMK1, cofilin phosphorylation).
- Inhibition of ROCK2 activity with belumosudil reversed PCDH17-induced F-actin disorganization and spine defects.
Conclusions:
- PCDH17 plays a critical role in regulating dendritic spine development and synapse maturation.
- The PCDH17-ROCK2-actin pathway is a key mechanism underlying PCDH17's effects on spine structure and neuronal function.
- These findings provide novel pathological insights into the neurobiological basis of mood disorders and identify potential therapeutic targets.
