Maternal opioids age-dependently impair neonatal respiratory control networks

Area of Science:

• Neuroscience
• Neonatal Physiology
• Pharmacology

Background:

• Opioid use during pregnancy is increasing, leading to a rise in Neonatal Abstinence Syndrome (NAS).
• Infants with NAS often experience respiratory distress, but the direct impact of maternal opioids on neonatal respiratory control is not well understood.
• Breathing is centrally regulated by brainstem and spinal cord networks, which may be affected by prenatal opioid exposure.

Purpose of the Study:

• To investigate the direct effects of maternal opioid exposure on developing neonatal central respiratory control networks.
• To determine if prenatal opioid exposure alters the response of neonatal respiratory networks to exogenous opioids.

Main Methods:

• Utilized progressively isolated respiratory network circuitry to assess fictive respiratory-related motor activity.
• Examined age-dependent effects of maternal opioids on respiratory networks in neonates.
• Tested responses of isolated respiratory control networks to exogenous opioids and analyzed opioid receptor expression in the preBötzinger Complex.

Main Results:

• Maternal opioid exposure age-dependently impaired respiratory network activity in more complete respiratory circuits.
• Isolated medullary slices containing the preBötzinger Complex were unaffected, suggesting localized effects.
• Neonatal respiratory control networks showed age-dependent blunted responses to exogenous opioids, correlated with altered opioid receptor expression.

Conclusions:

• Maternal opioids directly impair neonatal central respiratory control in an age-dependent manner.
• These impairments contribute to breathing destabilization and respiratory distress in infants with NAS.
• Findings provide a basis for developing therapeutics to support breathing in infants affected by maternal opioid exposure.