Published in:
Open Access
01-12-2016 | Research article
The NLRP3 and NLRP1 inflammasomes are activated in Alzheimer’s disease
Authors:
Marina Saresella, Francesca La Rosa, Federica Piancone, Martina Zoppis, Ivana Marventano, Elena Calabrese, Veronica Rainone, Raffaello Nemni, Roberta Mancuso, Mario Clerici
Published in:
Molecular Neurodegeneration
|
Issue 1/2016
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Abstract
Background
Interleukin-1 beta (IL-1β) and its key regulator, the inflammasome, are suspected to play a role in the neuroinflammation observed in Alzheimer’s disease (AD); no conclusive data are nevertheless available in AD patients.
Results
mRNA for inflammasome components (NLRP1, NLRP3, PYCARD, caspase 1, 5 and 8) and downstream effectors (IL-1β, IL-18) was up-regulated in severe and MILD AD. Monocytes co-expressing NLRP3 with caspase 1 or caspase 8 were significantly increased in severe AD alone, whereas those co-expressing NLRP1 and NLRP3 with PYCARD were augmented in both severe and MILD AD. Activation of the NLRP1 and NLRP3 inflammasomes in AD was confirmed by confocal microscopy proteins co-localization and by the significantly higher amounts of the pro-inflammatory cytokines IL-1β and IL-18 being produced by monocytes. In MCI, the expression of NLRP3, but not the one of PYCARD or caspase 1 was increased, indicating that functional inflammasomes are not assembled in these individuals: this was confirmed by lack of co-localization and of proinflammatory cytokines production.
Conclusions
The activation of at least two different inflammasome complexes explains AD-associated neuroinflammation. Strategies targeting inflammasome activation could be useful in the therapy of AD.