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Loss of cation-chloride cotransporter expression in preterm infants with white matter lesions: implications for the

Shenandoah Robinson1, Irina Mikolaenko, Ian Thompson

  • 1Divisions of Pediatric Neurosurgery, Neurology, Rainbow Babies & Children's Hospital, 11100 Euclid Ave, Cleveland, OH 44106, USA. Shenandoah.robinson@uhhs.com

Journal of Neuropathology and Experimental Neurology
|May 15, 2010
PubMed

Insights

Preterm birth can cause epilepsy by disrupting brain development. This study found that white matter injury in preterm infants alters key proteins, impairing gamma-amino butyric acid (GABA)ergic synapse development and potentially leading to seizures.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Pediatric Neurology

Background:

  • Epilepsy in preterm infants is often treatment-resistant and linked to cognitive and behavioral issues.
  • These neurological problems may stem from disrupted cerebral circuitry development during critical prenatal periods.
  • Prenatal injury is hypothesized to interfere with the developmental shift of gamma-amino butyric acid (GABA)ergic synapses from excitatory to inhibitory.

Purpose of the Study:

  • To investigate if prenatal injury impairs the developmental switch of GABAergic synapses in preterm infants.
  • To determine the role of cation-chloride transporters in disrupted cortical circuit formation following preterm birth.
  • To identify molecular mechanisms underlying epilepsy risk in preterm infants with white matter injury.

Main Methods:

  • Immunohistochemistry was used to compare protein expression in postmortem cerebral samples.
  • Samples were analyzed from preterm infants with white matter injury (n=11) and controls with minimal gliosis (n=7).
  • Expression of cation-chloride transporters (NKCC1, KCC2), calretinin, and VGLUT1 was assessed.

Main Results:

  • Control brains exhibited typical developmental expression of NKCC1, KCC2, and calretinin.
  • Infants with white matter damage showed significantly reduced NKCC1 and KCC2 expression in subplate and white matter.
  • No significant differences were observed in total cell number or VGLUT1 expression between groups.

Conclusions:

  • Prenatal injury disrupts the expression of critical cation-chloride transporters involved in GABAergic synapse development.
  • This disruption in critical developmental stages may underlie the predisposition to epilepsy in preterm infants.
  • Findings suggest a molecular mechanism linking white matter injury from preterm birth to disrupted brain circuitry and epilepsy.

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