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Compensating for synaptic loss in Alzheimer’s disease

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Abstract

Confirming that synaptic loss is directly related to cognitive deficit in Alzheimer’s disease (AD) has been the focus of many studies. Compensation mechanisms counteract synaptic loss and prevent the catastrophic amnesia induced by synaptic loss via maintaining the activity levels of neural circuits. Here we investigate the interplay between various synaptic degeneration and compensation mechanisms, and abnormal cortical oscillations based on a large-scale network model consisting of 100,000 neurons exhibiting several cortical firing patterns, 8.5 million synapses, short-term plasticity, axonal delays and receptor kinetics. The structure of the model is inspired by the anatomy of the cerebral cortex. The results of the modelling study suggest that cortical oscillations respond differently to compensation mechanisms. Local compensation preserves the baseline activity of theta (5–7 Hz) and alpha (8–12 Hz) oscillations whereas delta (1–4 Hz) and beta (13–30 Hz) oscillations are maintained via global compensation. Applying compensation mechanisms independently shows greater effects than combining both compensation mechanisms in one model and applying them in parallel. Consequently, it can be speculated that enhancing local compensation might recover the neural processes and cognitive functions that are associated with theta and alpha oscillations whereas inducing global compensation might contribute to the repair of neural (cognitive) processes which are associated with delta and beta band activity. Compensation mechanisms may vary across cortical regions and the activation of inappropriate compensation mechanism in a particular region may fail to recover network dynamics and/or induce secondary pathological changes in the network.

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Acknowledgments

The authors would like to thank the anonymous reviewers for their valuable comments and suggestions to improve the quality of the paper. This work is supported by the Northern Ireland Department for Education and Learning under the Strengthening the All Island Research Base Programme.

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  1. Intelligent Systems Research Centre, University of Ulster, Magee Campus, Derry, BT48 7JL, UK

    Kamal Abuhassan, Damien Coyle, Ammar Belatreche & Liam Maguire

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  1. Kamal Abuhassan
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Correspondence to Kamal Abuhassan.

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Abuhassan, K., Coyle, D., Belatreche, A. et al. Compensating for synaptic loss in Alzheimer’s disease. J Comput Neurosci 36, 19–37 (2014). https://doi.org/10.1007/s10827-013-0462-8

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