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Transcutaneous Microcirculatory Imaging in Preterm Neonates
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Transcutaneous Microcirculatory Imaging in Preterm Neonates

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Micronucleated erythrocytes in preterm newborns exposed to phototherapy and/or oxygentherapy

Guillermo M Zúñiga-González1, Belinda C Gómez-Meda, María de Lourdes Lemus-Varela

  • 1Laboratorio de Mutagénesis, Centro de Investigación Biomédica de Occidente, Instituto Mexicano del Seguro Social, Guadalajara, Jalisco, Mexico. mutagenesis95@hotmail.com

Journal of Photochemistry and Photobiology. B, Biology
|January 3, 2012
PubMed

Insights

Postnatal treatments like phototherapy can increase DNA damage in preterm newborns (PNBs). This study found a significant rise in micronucleated cells with longer phototherapy exposure in PNBs.

Area of Science:

  • Neonatal Medicine
  • Pediatric Hematology
  • Environmental Health

Background:

  • Preterm newborns (PNBs) possess underdeveloped antioxidant defenses, increasing susceptibility to oxidative stress from medical interventions.
  • Postnatal treatments are essential but may pose risks due to immature physiological systems in PNBs.

Purpose of the Study:

  • To investigate the association between common postnatal treatments and DNA damage in preterm newborns.
  • Specifically, to determine if micronucleated erythrocytes increase following oxygen therapy and/or phototherapy.

Main Methods:

  • Analysis of 72 blood samples from PNBs (26-36 weeks gestation) within 84 hours of birth.
  • Quantification of micronucleated erythrocytes and micronucleated polychromatic erythrocytes as biomarkers of DNA damage.
  • Correlation of DNA damage markers with exposure duration to oxygen therapy and combined phototherapy plus oxygen therapy.

Main Results:

  • No significant increase in DNA damage markers was observed in PNBs receiving only oxygen therapy.
  • A statistically significant increase in micronucleated polychromatic erythrocytes was detected with extended exposure to phototherapy combined with oxygen.
  • These findings suggest phototherapy contributes to observable DNA damage in PNBs' peripheral blood cells.

Conclusions:

  • Phototherapy, particularly when combined with oxygen, appears to induce DNA damage in preterm newborns.
  • Monitoring micronucleated erythrocytes may serve as a sensitive indicator of treatment-related genotoxicity in PNBs.
  • Further research into mitigating oxidative stress from phototherapy in PNBs is warranted.

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