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A Pipeline to Investigate the Structures and Signaling Pathways of Sphingosine 1-Phosphate Receptors
Published on: June 8, 2022
Sphingolipids in multiple sclerosis
Arundhati Jana1, Kalipada Pahan
1Department of Neurological Sciences, Rush University Medical Center, Cohn Research Building, Suite 320, 1735 West Harrison St., Chicago, IL 60612, USA.
Abstract:
Multiple sclerosis (MS) is a chronic autoimmune demyelinating disease of the CNS. Oligodendrocytes, the myelin-forming cells of the central nervous system (CNS), are target cells in MS. Although the etiology of MS is poorly known, new insights suggest oligodendrocyte apoptosis as one of the critical events followed by glial activation and infiltration of lymphocytes and macrophages. A major breakthrough in delineation of the mechanism of cell death, perivascular cuffing, and glial activation came from elucidation of the sphingolipid signal transduction pathway. The sphingolipid signal transduction pathway induces apoptosis, differentiation, proliferation, and growth arrest depending upon cell and receptor types, and downstream targets. Sphingomyelin, a major component of myelin membrane formed by mature oligodendrocytes, is abundant in the CNS and ceramide, its primary catabolic product released by activation of either neutral or acidic sphingomyelinase, serves as a potential lipid second messenger or mediator molecule modulating diverse cellular signaling pathways. Similarly, under certain conditions, sphingosine produced from ceramide by ceramidase is phosphorylated by sphingosine kinases to sphingosine-1 phosphate, another potent second messenger molecule. Both ceramide and sphingosine-1 phosphate regulate life and death of many cell types including brain cells and participate in pathogenic processes of MS. In this review, we have made an honest attempt to compile recent findings made by others and us relating to the role of sphingolipids in the disease process of MS.
Insights
Multiple sclerosis (MS) involves oligodendrocyte apoptosis, with sphingolipids like ceramide and sphingosine-1-phosphate playing key roles in central nervous system (CNS) damage and disease progression.
Area of Science:
- Neuroimmunology
- Cellular Biology
- Biochemistry
Background:
- Multiple sclerosis (MS) is a chronic autoimmune CNS disease targeting myelin-forming oligodendrocytes.
- Oligodendrocyte apoptosis is a critical event in MS pathogenesis, leading to glial activation and immune cell infiltration.
- The sphingolipid signaling pathway is increasingly recognized for its role in cell death and CNS disease.
Purpose of the Study:
- To review the current understanding of sphingolipid metabolism and function in the context of MS.
- To highlight the roles of ceramide and sphingosine-1-phosphate as key mediators in MS pathogenesis.
- To compile recent findings on sphingolipids' involvement in oligodendrocyte apoptosis and CNS inflammation.
Main Methods:
- Literature review and synthesis of existing research on sphingolipids and MS.
- Analysis of the sphingolipid signal transduction pathway, including enzymes like sphingomyelinase and ceramidase.
- Discussion of the roles of ceramide and sphingosine-1-phosphate as signaling molecules.
Main Results:
- Sphingolipids, particularly ceramide and sphingosine-1-phosphate, are implicated in oligodendrocyte apoptosis and CNS inflammation in MS.
- These molecules act as critical lipid second messengers regulating cell survival and death pathways.
- Dysregulation of sphingolipid metabolism contributes to the pathogenic processes observed in MS.
Conclusions:
- Sphingolipids are central players in the complex pathogenesis of multiple sclerosis.
- Targeting sphingolipid pathways may offer novel therapeutic strategies for MS.
- Further research into sphingolipid metabolism is crucial for understanding and treating MS.
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