Oxysterol-binding protein-related protein 6 regulates neuronal morphology and migration of cerebellar granule cells during cerebellar development in vivo
Related Experiment Video
Updated: Apr 21, 2026
Genetic Manipulation of Cerebellar Granule Neurons In Vitro and In Vivo to Study Neuronal Morphology and Migration
Published on: March 17, 2014
Shinya Mochizuki1, Wataru Nishimura1, Masanori Takahashi1
1Division of Cell Biology and Anatomy, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi, 329-0498, Japan.
Insights
Oxysterol-binding protein (OSBP)-related protein (ORP) 6 regulates neuronal development. ORP6 impacts neurite outgrowth and cerebellar granule cell migration, suggesting a role in neuronal morphology and cell movement.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Oxysterol-binding protein (OSBP)-related protein (ORP) 6 is localized at endoplasmic reticulum-plasma membrane contact sites.
- ORP6 is involved in lipid composition regulation via counter-transport of phosphatidylinositol-4-phosphate and phosphatidylserine in neurons.
- The physiological functions of ORP6-mediated lipid counter-transport are not well understood.
Purpose of the Study:
- To investigate the developmental expression of ORP6 protein in the mouse cerebellum.
- To determine the role of ORP6 in neuronal differentiation and migration.
Main Methods:
- Used Neuro-2A cells and primary cultured cerebellar granule cells (CGCs).
- Investigated ORP6 expression during development (P7-P21).
- Utilized ORP6 RNAi knockdown, dominant-negative ORP6 constructs, and in vivo electroporation.
Main Results:
- ORP6 protein expression increased during key periods of cerebellar development.
- ORP6 knockdown or dominant-negative expression enhanced neurite outgrowth in Neuro-2A cells and primary CGCs.
- ORP6 manipulation disrupted CGC migration in vitro and in vivo.
Conclusions:
- ORP6 plays a role in regulating neuronal morphology, specifically neurite outgrowth.
- ORP6 is involved in the migration of cerebellar granule cells.
- Lipid counter-transport mediated by ORP6 may be crucial for neuronal development and migration.
Abstract:
Oxysterol-binding protein (OSBP)-related protein (ORP) 6, a member of subfamily III of the ORP family, localizes at endoplasmic reticulum-plasma membrane contact sites and is involved in regulating the turnover of the lipid composition of the plasma membrane through the counter-transport of phosphatidylinositol-4-phosphate and phosphatidylserine in neurons. However, the physiological functions of ORP6-mediated lipid counter-transport remain poorly understood. In the present study, we investigated the developmental expression of ORP6 protein in the mouse cerebellum and the role of ORP6 in neuronal differentiation and migration using Neuro-2A cells and primary cultured cerebellar granule cells (CGCs). The expression of the ORP6 protein increased from P7 to P21, coinciding with a key period of granule cell progenitor proliferation and immature CGC migration. Both ORP6 RNAi knockdown and overexpression of two different types of dominant-negative ORP6 constructs significantly increased the number and length of neurites in retinoic acid-induced differentiated Neuro-2A cells. Similarly, ORP6 knockdown in primary cultured CGCs increased neurite number and length and disrupted their migration in vitro. Furthermore, overexpression of a dominant-negative form of ORP6 in immature CGCs using in vivo electroporation impaired their migration into the granule layer. Taken together, these results suggest the possible involvement of lipid counter-transport by ORP6 in the regulation of neuronal morphology and migration of CGCs.
