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Roles of Siglecs in neurodegenerative diseases
Jian Jing Siew1, Yijuang Chern1, Kay-Hooi Khoo2
1Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan.
Abstract:
Microglia are resident myeloid cells in the central nervous system (CNS) with a unique developmental origin, playing essential roles in developing and maintaining the CNS environment. Recent studies have revealed the involvement of microglia in neurodegenerative diseases, such as Alzheimer's disease, through the modulation of neuroinflammation. Several members of the Siglec family of sialic acid recognition proteins are expressed on microglia. Since the discovery of the genetic association between a polymorphism in the CD33 gene and late-onset Alzheimer's disease, significant efforts have been made to elucidate the molecular mechanism underlying the association between the polymorphism and Alzheimer's disease. Furthermore, recent studies have revealed additional potential associations between Siglecs and Alzheimer's disease, implying that the reduced signal from inhibitory Siglec may have an overall protective effect in lowering the disease risk. Evidences suggesting the involvement of Siglecs in other neurodegenerative diseases are also emerging. These findings could help us predict the roles of Siglecs in other neurodegenerative diseases. However, little is known about the functionally relevant Siglec ligands in the brain, which represents a new frontier. Understanding how microglial Siglecs and their ligands in CNS contribute to the regulation of CNS homeostasis and pathogenesis of neurodegenerative diseases may provide us with a new avenue for disease prevention and intervention.
Insights
Microglia, immune cells in the brain, are key in neurodegenerative diseases like Alzheimer's. Siglecs, proteins on microglia, show potential for new therapeutic strategies targeting these conditions.
Area of Science:
- Neuroscience
- Immunology
- Genetics
Background:
- Microglia are the primary immune cells of the central nervous system (CNS), crucial for its development and maintenance.
- Microglia are increasingly implicated in neuroinflammation associated with neurodegenerative diseases, including Alzheimer's disease.
- Siglec (sialic acid recognition protein) family members are expressed on microglia and are being investigated for their role in CNS diseases.
Purpose of the Study:
- To explore the role of microglial Siglecs in the pathogenesis of neurodegenerative diseases.
- To understand the molecular mechanisms linking CD33 gene polymorphism to late-onset Alzheimer's disease.
- To identify potential therapeutic targets within the Siglec-ligand interactions in the CNS.
Main Methods:
- Review of recent genetic association studies linking CD33 polymorphism to Alzheimer's disease.
- Analysis of emerging evidence on Siglec involvement in Alzheimer's disease and other neurodegenerative conditions.
- Identification of knowledge gaps concerning Siglec ligands in the brain.
Main Results:
- A polymorphism in the CD33 gene is genetically associated with late-onset Alzheimer's disease.
- Reduced signaling from inhibitory Siglecs may offer a protective effect against Alzheimer's disease risk.
- Emerging evidence suggests Siglecs are involved in other neurodegenerative diseases beyond Alzheimer's.
Conclusions:
- Siglecs represent a promising area for understanding and potentially intervening in neurodegenerative diseases.
- Further research into microglial Siglec-ligand interactions is crucial for CNS homeostasis and disease pathogenesis.
- Understanding these pathways may open new avenues for disease prevention and therapeutic strategies.
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