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An elevated hematogenous photosensitizer in the preterm neonate
L A Bynoe1, J D Gottsch, S R Sadda
1Wilmer Ophthalmological Institute, Johns Hopkins Hospital, Baltimore, Maryland 21205.
Investigative Ophthalmology & Visual Science
|September 1, 1993
Summary
Preterm infants have higher protoporphyrin IX (PP IX) levels, a compound linked to potential retinal injury. This finding suggests a possible mechanism for retinopathy of prematurity (ROP) in vulnerable newborns.
Area of Science:
- Biochemistry
- Neonatology
- Ophthalmology
Background:
- Human blood contains low levels of protoporphyrin IX (PP IX), a photoactive compound.
- PP IX photoactivation generates reactive oxygen species, potentially causing tissue damage.
- This mechanism is hypothesized to contribute to retinal injury in retinopathy of prematurity (ROP).
Purpose of the Study:
- To investigate the association between blood PP IX levels and infant birth weight.
- To determine the relationship between blood PP IX levels and gestational age.
- To explore the potential role of PP IX in ROP pathogenesis.
Main Methods:
- Erythrocyte PP IX levels were quantified in umbilical cord blood samples.
- Samples were collected from 31 neonates, including both full-term and preterm infants.
- Infant birth weights and gestational ages were systematically recorded.
Main Results:
- Infants weighing less than 1000 grams exhibited significantly higher average PP IX levels (200 µg/dL) compared to those weighing over 1000 grams (125 µg/dL).
- The difference in PP IX levels between the two birth weight groups was statistically significant (P < 0.02).
Conclusions:
- Elevated blood PP IX levels in preterm neonates may increase their susceptibility to photosensitizing retinal injury.
- This finding highlights a potential risk factor for retinopathy of prematurity.
- Further research is warranted to confirm the role of PP IX in ROP development.