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001030397 1001_ $$00000-0003-4864-9477$$aChakrabarti, Kalyan S.$$b0$$eFirst author
001030397 245__ $$aBifurcations in coupled amyloid-β aggregation-inflammation systems
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001030397 520__ $$aA complex interplay between various processes underlies the neuropathology of Alzheimer’s disease (AD) and its progressive course. Several lines of evidence point to the coupling between Aβ aggregation and neuroinflammation and its role in maintaining brain homeostasis during the long prodromal phase of AD. Little is however known about how this protective mechanism fails and as a result, an irreversible and progressive transition to clinical AD occurs. Here, we introduce a minimal model of a coupled system of Aβ aggregation and inflammation, numerically simulate its dynamical behavior, and analyze its bifurcation properties. The introduced model represents the following events: generation of Aβ monomers, aggregation of Aβ monomers into oligomers and fibrils, induction of inflammation by Aβ aggregates, and clearance of various Aβ species. Crucially, the rates of Aβ generation and clearance are modulated by inflammation level following a Hill-type response function. Despite its relative simplicity, the model exhibits enormously rich dynamics ranging from overdamped kinetics to sustained oscillations. We then specify the region of inflammation- and coupling-related parameters space where a transition to oscillatory dynamics occurs and demonstrate how changes in Aβ aggregation parameters could shift this oscillatory region in parameter space. Our results reveal the propensity of coupled Aβ aggregation-inflammation systems to oscillatory dynamics and propose prolonged sustained oscillations and their consequent immune system exhaustion as a potential mechanism underlying the transition to a more progressive phase of amyloid pathology in AD. The implications of our results in regard to early diagnosis of AD and anti-AD drug development are discussed.
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001030397 7001_ $$00009-0007-3310-9992$$aBakhtiari, Davood$$b1
001030397 7001_ $$0P:(DE-Juel1)194492$$aRezaei-Ghaleh, Nasrollah$$b2$$eCorresponding author
001030397 773__ $$0PERI:(DE-600)2841868-2$$a10.1038/s41540-024-00408-7$$gVol. 10, no. 1, p. 80$$n1$$p80$$tnpj Systems biology and applications$$v10$$x2056-7189$$y2024
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