4.7 Article

Systemic and transdermal melatonin administration prevents neuropathology in response to perinatal asphyxia in newborn lambs

Journal

JOURNAL OF PINEAL RESEARCH
Volume 64, Issue 4, Pages -

Publisher

WILEY
DOI: 10.1111/jpi.12479

Keywords

brain injury; cell death; melatonin; neuroprotection; oxidative stress; perinatal asphyxia; radiology; transdermal

Funding

  1. National Health and Medical Research Council [1048039]
  2. Australian Research Council Future Fellowship
  3. Victorian Government's Operational Infrastructure Support Program

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Perinatal asphyxia remains a principal cause of infant mortality and long-term neurological morbidity, particularly in low-resource countries. No neuroprotective interventions are currently available. Melatonin (MLT), a potent antioxidant, anti-inflammatory and antiapoptotic agent, offers promise as an intravenous (IV) or transdermal therapy to protect the brain. We aimed to determine the effect of melatonin (IV or transdermal patch) on neuropathology in a lamb model of perinatal asphyxia. Asphyxia was induced in newborn lambs via umbilical cord occlusion at birth. Animals were randomly allocated to melatonin commencing 30minutes after birth (60mg in 24hours; IV or transdermal patch). Brain magnetic resonance spectroscopy (MRS) was undertaken at 12 and 72hours. Animals (control n=9; control+MLT n=6; asphyxia n=16; asphyxia+MLT [IV n=14; patch n=4]) were euthanised at 72hours, and cerebrospinal fluid (CSF) and brains were collected for analysis. Asphyxia resulted in severe acidosis (pH 6.9 +/- 0.0; lactate 9 +/- 2mmol/L) and altered determinants of encephalopathy. MRS lactate:N-acetyl aspartate ratio was 2.5-fold higher in asphyxia lambs compared with controls at 12hours and 3-fold higher at 72hours (P<.05). Melatonin prevented this rise (3.5-fold reduced vs asphyxia; P=.02). Asphyxia significantly increased brain white and grey matter apoptotic cell death (activated caspase-3), lipid peroxidation (4HNE) and neuroinflammation (IBA-1). These changes were significantly mitigated by both IV and patch melatonin. Systemic or transdermal neonatal melatonin administration significantly reduces the neuropathology and encephalopathy signs associated with perinatal asphyxia. A simple melatonin patch, administered soon after birth, may improve outcome in infants affected by asphyxia, especially in low-resource settings.

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