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A Differentiated SH-SY5Y Model of Hypoxic-Ischaemic Injury Reveals Dynamic Transcriptomic Responses During
Maryam Adenike Salaudeen1,2,3, Stuart M Allan1,2, Emmanuel Pinteaux1,2
1Division of Neuroscience, Faculty of Biology, Medicine, and Health, School of Biological Sciences, University of Manchester, Manchester M13 9PL, UK.
Summary
This study developed an in vitro model of hypoxic-ischaemic brain injury using neuron-like cells. The model reveals a time-dependent gene expression cascade, identifying key regulators for potential therapeutic targeting in stroke.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Hypoxic-ischaemic (HI) brain injury is a significant cause of neurological deficits, particularly after stroke.
- Understanding neuronal responses to oxygen and nutrient deprivation is crucial for comprehending HI pathogenesis.
Purpose of the Study:
- To establish a robust in vitro model for screening potential therapeutics for brain hypoxic injury.
- To identify diagnostic markers associated with brain hypoxic injury.
Main Methods:
- Developed and validated a protocol using differentiated SH-SY5Y neuroblastoma cells (Neuron-like Cells, NLCs).
- Optimized oxygen-glucose deprivation (OGD) conditions and simulated HI by exposing NLCs to OGD followed by reoxygenation.
- Utilized bulk RNA-sequencing to analyze temporal transcriptional responses.
Main Results:
- Identified a distinct, time-dependent transcriptional response to HI, with injury-associated genes upregulated early and peaking at 6 hours of reoxygenation.
- IL-1β, TNF-α, and HIF-1α were identified as key drivers during OGD, with other regulators like TGF-β1 and NTRK1 emerging later.
- Observed increased release of inflammatory and neurotrophic mediators, with maximal cell death occurring at 24 hours post-injury.
Conclusions:
- The study elucidates a transient transcriptional cascade following hypoxic-ischaemic injury, indicating a critical window for neuronal response.
- The developed NLC model offers a reproducible platform for studying neuronal injury and recovery mechanisms.
- Identified known (TNF-α, IL-β, HIF-1α), context-specific (NTRK1, TGF-β), and novel (β-oestradiol) regulators of HI injury with therapeutic potential.
