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Prenatal radiation risk to the brain.

L G Cockerham1, G D Prell

  • 1National Center for Toxicological Research Associated Universities, University of Arkansas for Medical Sciences, Little Rock 72205-7122.

Neurotoxicology
|January 1, 1989
PubMed
Summary

Ionizing radiation harms the developing central nervous system (CNS). Maternal irradiation can increase fetal exposure to histamine and serotonin, leading to CNS damage.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Radiation Biology

Background:

  • The central nervous system (CNS) is highly sensitive to ionizing radiation during development.
  • Exposure to ionizing radiation above 10 cGy during perinatal development is contraindicated.
  • Maternal irradiation can lead to embryonic growth retardation, potentially exacerbated by factors like ethanol-induced SOD reduction.

Purpose of the Study:

  • To investigate the mechanisms by which maternal irradiation affects fetal CNS development.
  • To explore the role of endogenous compounds like histamine and serotonin in radiation-induced fetal CNS damage.
  • To understand the implications of increased blood-brain barrier permeability in the fetus.

Main Methods:

  • Review of existing literature on radiation effects on the developing CNS.
  • Analysis of studies on synergistic interactions between radiation and other agents (e.g., ethanol).
  • Examination of the impact of maternal irradiation on fetal circulation and blood-brain barrier integrity.

Main Results:

  • Maternal irradiation can increase maternal circulation levels of histamine and serotonin.
  • These compounds can cross the more permeable fetal blood-brain barrier.
  • Increased fetal exposure to histamine and serotonin may cause hypotension, edema, cerebral ischemia, and CNS damage.

Conclusions:

  • Maternal irradiation poses significant risks to fetal CNS development.
  • Endogenous vasoactive compounds play a crucial role in mediating radiation-induced fetal neurotoxicity.
  • Protecting the developing CNS from radiation requires understanding these complex interactions.

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