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Wu L, Wang F, Moncman CL, Pandey M, Clarke HA, Frazier HN, Young LE, Gentry MS, Cai W, Thibault O, Sun RC, Andres DA. RIT1 regulation of CNS lipids RIT1 deficiency Alters cerebral lipid metabolism and reduces white matter tract oligodendrocytes and conduction velocities. Heliyon 2023; 9:e20384. [PMID: 37780758 PMCID: PMC10539968 DOI: 10.1016/j.heliyon.2023.e20384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 07/21/2023] [Accepted: 09/20/2023] [Indexed: 10/03/2023] Open
Abstract
Oligodendrocytes (OLs) generate lipid-rich myelin membranes that wrap axons to enable efficient transmission of electrical impulses. Using a RIT1 knockout mouse model and in situ high-resolution matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) coupled with MS-based lipidomic analysis to determine the contribution of RIT1 to lipid homeostasis. Here, we report that RIT1 loss is associated with altered lipid levels in the central nervous system (CNS), including myelin-associated lipids within the corpus callosum (CC). Perturbed lipid metabolism was correlated with reduced numbers of OLs, but increased numbers of GFAP+ glia, in the CC, but not in grey matter. This was accompanied by reduced myelin protein expression and axonal conduction deficits. Behavioral analyses revealed significant changes in voluntary locomotor activity and anxiety-like behavior in RIT1KO mice. Together, these data reveal an unexpected role for RIT1 in the regulation of cerebral lipid metabolism, which coincide with altered white matter tract oligodendrocyte levels, reduced axonal conduction velocity, and behavioral abnormalities in the CNS.
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Affiliation(s)
- Lei Wu
- Department of Molecular and Cellular Biochemistry, College of Medicine, University of Kentucky, KY 40536, USA
| | - Fang Wang
- Department of Molecular and Cellular Biochemistry, College of Medicine, University of Kentucky, KY 40536, USA
| | - Carole L. Moncman
- Department of Molecular and Cellular Biochemistry, College of Medicine, University of Kentucky, KY 40536, USA
| | - Mritunjay Pandey
- Department of Molecular and Cellular Biochemistry, College of Medicine, University of Kentucky, KY 40536, USA
| | - Harrison A. Clarke
- Department of Neuroscience, College of Medicine, University of Kentucky, KY 40536, USA
| | - Hilaree N. Frazier
- Department of Pharmacological and Nutritional Sciences, College of Medicine, University of Kentucky, KY 40536, USA
| | - Lyndsay E.A. Young
- Department of Molecular and Cellular Biochemistry, College of Medicine, University of Kentucky, KY 40536, USA
- Markey Cancer Center, Lexington, KY 40536, USA
| | - Matthew S. Gentry
- Department of Molecular and Cellular Biochemistry, College of Medicine, University of Kentucky, KY 40536, USA
- Markey Cancer Center, Lexington, KY 40536, USA
- Department of Biochemistry and Molecular Biology, University of Florida, College of Medicine, Gainesville, FL 32611, USA
- Center for Advanced Spatial Biomolecule Research, University of Florida, College of Medicine, Gainesville, FL 32611, USA
| | - Weikang Cai
- Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, NY 11568, USA
| | - Olivier Thibault
- Department of Pharmacological and Nutritional Sciences, College of Medicine, University of Kentucky, KY 40536, USA
| | - Ramon C. Sun
- Department of Neuroscience, College of Medicine, University of Kentucky, KY 40536, USA
- Markey Cancer Center, Lexington, KY 40536, USA
- Sanders-Brown Center on Aging, University of Kentucky, Lexington, KY 40536, USA
- Department of Biochemistry and Molecular Biology, University of Florida, College of Medicine, Gainesville, FL 32611, USA
- Center for Advanced Spatial Biomolecule Research, University of Florida, College of Medicine, Gainesville, FL 32611, USA
| | - Douglas A. Andres
- Department of Molecular and Cellular Biochemistry, College of Medicine, University of Kentucky, KY 40536, USA
- Markey Cancer Center, Lexington, KY 40536, USA
- Spinal Cord and Brain Injury Research Center, College of Medicine, University of Kentucky, KY 40536, USA
- Gill Heart and Vascular Institute, College of Medicine, University of Kentucky, Lexington, KY 40536, USA
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