Aβ_1-42 peptide toxicity on neuronal cells: A lipidomic study

Area of Science:

• Neuroscience
• Biochemistry
• Lipidomics

Background:

• Alzheimer's Disease (AD) pathogenesis and early lipid changes remain unclear.
• Amyloid aggregation is central to early AD, impacting brain tissues years before symptoms.
• Identifying early biomarkers is crucial for understanding and treating AD.

Purpose of the Study:

• To develop a lipidomic approach evaluating amyloid-beta (Aβ) toxic effects on human neuroblastoma cells (SH-SY5Y).
• To identify qualitative and quantitative lipid variations linked to amyloid toxicity.
• To discover novel lipid-based biomarkers resulting from amyloid peptide-cell membrane interactions.

Main Methods:

• Differentiated SH-SY5Y cells were treated with varying concentrations of Aβ_1-42 over different time points.
• Lipid extraction was performed using a 2-propanol-water precipitation protocol.
• Lipid profiles were analyzed using LC-MS with data-independent SWATH acquisition, processed by MS-DIAL.

Main Results:

• Identified and relatively quantified altered lipid species in SH-SY5Y cells exposed to Aβ_1-42.
• Demonstrated the suitability of the lipidomic approach for revealing lipid alterations correlated with Aβ aggregation species.
• Observed lipid changes consistent with literature findings from AD patient cerebrospinal fluid and plasma.

Conclusions:

• The developed in vitro model effectively highlights lipid alterations in response to amyloid toxicity.
• This method can explore cellular responses to toxic stimuli and identify potential AD biomarkers.
• Further validation could establish this approach for preliminary biomarker identification in AD patients.