Early life inflammation is associated with spinal cord excitability and nociceptive sensitivity in human infants

Area of Science:

• Neuroscience
• Immunology
• Developmental Biology

Background:

• Immune function and pain sensitivity are linked, but the impact of early life inflammation on human sensory nervous system development is unclear.
• Neonatal infections can trigger inflammatory responses with potential long-term consequences.

Purpose of the Study:

• To investigate the effects of early-onset neonatal infection on tactile and noxious evoked responses in term-born infants.
• To assess the association between neonatal inflammation and sensory nervous system development.

Main Methods:

• Utilized electroencephalography (EEG) and electromyography (EMG) to measure brain and reflex withdrawal activity.
• Employed the Premature Infant Pain Profile-Revised (PIPP-R) score for behavioral and physiological assessments.
• Measured C-reactive protein levels to assess neonatal inflammation.

Main Results:

• Neonatal inflammation was linked to increased spinal cord excitability.
• Infants with inflammation showed heightened brain activity in response to both tactile and noxious stimuli.
• Early indications suggest this hyperalgesia may persist after the inflammatory period.

Conclusions:

• Neonatal inflammation significantly impacts sensory processing in infants.
• Early-life immune dysfunction can alter pain sensitivity, potentially leading to long-term hyperalgesia.
• Findings support pre-clinical data on immune system influences on adult pain sensitivity.