Neuro-oxidative-nitrosative stress in sepsis

Area of Science:

• Neuroscience
• Biochemistry
• Pathology

Background:

• Sepsis can lead to severe brain dysfunction.
• Oxidative and nitrosative stress are implicated in sepsis-associated neurological complications.

Purpose of the Study:

• To review the molecular mechanisms of neuro-oxidative-nitrosative stress in sepsis-induced brain dysfunction.
• To elucidate the role of reactive oxygen and nitrogen species (ROS/RNS) in sepsis-associated encephalopathy and cognitive deficits.

Main Methods:

• Literature review of studies investigating oxidative stress in sepsis and the brain.
• Analysis of the biochemical pathways involving ROS/RNS, nitric oxide (NO), and peroxynitrite (ONOO(-)).

Main Results:

• Sepsis-induced ROS/RNS overwhelm antioxidant systems, causing lipid peroxidation and membrane damage in the brain vasculature and parenchyma.
• ROS/RNS lead to mitochondrial dysfunction, inhibiting energy production and causing neuronal bioenergetic failure.
• Free radical-induced neuronal apoptosis occurs in vulnerable brain regions, contributing to encephalopathy and long-term cognitive impairment.

Conclusions:

• Neuro-oxidative-nitrosative stress is a key molecular mechanism underlying sepsis-associated brain dysfunction.
• ROS/RNS-mediated neuronal bioenergetic failure and apoptosis are primary drivers of sepsis-associated encephalopathy.
• These mechanisms contribute to permanent cognitive deficits in sepsis survivors.