Basic Science and Pathogenesis

Area of Science:

• Neuroscience
• Immunology
• Biochemistry

Background:

• Osteopontin (SPP1) is a key glycoprotein in inflammation and tissue remodeling.
• SPP1 mediates Alzheimer's disease (AD) progression by interacting with immune cells and pathological proteins like beta-amyloid (APP) and tau (MAPT).
• Periodontal infections elevate SPP1, potentially accelerating neuroinflammation and AD.

Purpose of the Study:

• To investigate the molecular mechanisms linking osteopontin (SPP1) to Alzheimer's disease (AD) progression.
• To analyze SPP1 interactions with AD-associated proteins and inflammatory pathways.
• To assess SPP1 gene expression in AD brain tissues.

Main Methods:

• Utilized the STRING platform for mapping SPP1 interactions with APP, MAPT, IL1B, TNF, MMP9, and CXCL8.
• Employed Cytoscape for network visualization and identified key protein hubs.
• Conducted Gene Ontology (GO) analysis for biological processes and pathways.
• Analyzed public GEO data for SPP1 gene expression and correlations with AD markers.

Main Results:

• SPP1 directly interacts with APP, MAPT, IL1B, TNF, MMP9, and CXCL8, central to AD and neuroinflammation.
• SPP1 activates the NF-κB pathway, promoting chronic inflammation and neurodegeneration.
• Elevated SPP1 expression in AD brains correlates significantly with APP, MAPT, and inflammatory cytokines IL1B and TNF.

Conclusions:

• Osteopontin (SPP1) plays a critical role in AD pathogenesis by interacting with APP and MAPT, activating NF-κB, and amplifying neuroinflammation.
• Increased SPP1 levels are linked to higher expression of AD pathology markers and inflammatory cytokines.
• Targeting SPP1 and managing periodontal inflammation presents a promising therapeutic strategy for Alzheimer's disease.