Intermittent fasting attenuates inflammasome activity in ischemic stroke

Area of Science:

• Neuroscience
• Immunology
• Metabolic research

Background:

• Cerebral ischemia, or stroke, causes tissue injury partly through inflammasome activation.
• Inflammasomes are multi-protein complexes that drive inflammatory responses.
• Intermittent fasting (IF) has shown potential in reducing systemic and brain inflammation.

Purpose of the Study:

• To investigate the effect of a 4-month intermittent fasting regimen on inflammasome activity in a mouse model of ischemic stroke.
• To determine if IF modulates NLRP1 and NLRP3 inflammasome pathways following cerebral ischemia-reperfusion (I/R).

Main Methods:

• Middle cerebral artery occlusion (MCAO) followed by reperfusion was used to induce ischemic stroke in C57BL/6J mice.
• Mice underwent a daily 16-hour fasting protocol for 4 months prior to stroke induction.
• Inflammasome protein expression, NF-κB and MAPK signaling activation, and pro-inflammatory cytokine levels (IL-1β, IL-18) were assessed in brain tissue.

Main Results:

• Intermittent fasting significantly decreased the activation of NF-κB and MAPK signaling pathways in the ischemic brain.
• IF treatment led to reduced expression of NLRP1 and NLRP3 inflammasome components.
• Levels of the pro-inflammatory cytokines IL-1β and IL-18 were significantly lower in the brains of IF-treated mice post-stroke.

Conclusions:

• Intermittent fasting attenuates the inflammatory response and subsequent tissue damage following ischemic stroke.
• The neuroprotective effects of IF are mediated, at least in part, by the suppression of NLRP1 and NLRP3 inflammasome activity.
• IF represents a promising dietary intervention for mitigating stroke-induced brain injury.