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Synapse loss and progress of Alzheimer's disease - A network model

Kashyap, G and Bapat, D and Das, D and Gowaikar, R and Amritkar, RE and Rangarajan, G and Ravindranath, V and Ambika, G (2019) Synapse loss and progress of Alzheimer's disease - A network model. In: SCIENTIFIC REPORTS, 9 (1).

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Official URL: https://doi.org/10.1038/s41598-019-43076-y


We present observational evidence from studies on primary cortical cultures from AD transgenic mice, APPSwe/PS1 Delta E9 (APP/PS1) mice, for significant decrease in total spine density at DIV-15 and onward. This indicates reduction in potential healthy synapses and strength of connections among neurons. Based on this, a network model of neurons is developed, that explains the consequent loss of coordinated activity and transmission efficiency among neurons that manifests over time. The critical time when structural connectivity in the brain undergoes a phase-transition, from initial robustness to irreparable breakdown, is estimated from this model. We also show how the global efficiency of signal transmission in the network decreases over time. Moreover, the number of multiple paths of high efficiency decreases rapidly as the disease progresses, indicating loss of structural plasticity and inefficiency in choosing alternate paths or desired paths for any pattern of activity. Thus loss of spines caused by beta-Amyloid (A beta) peptide results in disintegration of the neuronal network over time with consequent cognitive dysfunctions in Alzheimer's Disease (AD).

Item Type: Journal Article
Additional Information: copyright for this article belongs to SCIENTIFIC REPORTS
Department/Centre: Division of Biological Sciences > Centre for Neuroscience
Division of Physical & Mathematical Sciences > Mathematics
Date Deposited: 30 Oct 2019 06:07
Last Modified: 30 Oct 2019 06:07
URI: http://eprints.iisc.ac.in/id/eprint/62886

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